The GPS pinpoint location does not work.Im sure many of you have the same issue you just never checked.

Park in your driveway and press NAV it should tell you EXACT location your address ie: 123 Main St.

The dealer is telling me this feature does not work properly.The owners manual lists this feature as a highlight of the feature.

Im awaiting a GM rep to call me back with more excuses as to why this feature does not work properly.

Please post back after you try the NAV in your vehicle. Thanks

Works fine for me

I've noticed the same thing, hit the button in my driveway and was 3 numbers off. No big deal for me though, but if there is a fix i'd like to hear it!

3 numbers off? come on guys give it a break :D

we can uninvent GPS and go back to paper maps if that would be more satisfactory for y'all ):h

We are talking about XXXXX million square miles of land here in the US, all on one navigation DVD, I think the fact that it can even get within 10 numbers is pretty impressive!! They base the calculations of house numbers on known locations (major points of interest) and distances between POI's. Its not like they drive down each road and make a discrete map of where each individual house is. All civilian GPS accuracy is limited to +/- 25 meters anyway, so its not the navigation unit's fault.

ben

3 numbers off? come on guys give it a break :D


ben


Thats why i said no big deal;)

I've noticed the same thing, hit the button in my driveway and was 3 numbers off. No big deal for me though, but if there is a fix i'd like to hear it!

Mine is off by a 1/4 mile. Good thing I know what my house looks like...:rolleyes:


Big Max

i would say it's the maps, not the gps unit.

What a crock... 3 numbers off. What the hell are you looking for that it makes that much difference. My address is dead on but then unlike some, I actually know which house in mine. Do you guys think that the makers of the software and GPS to address conversions were infallable?

I'll give you $500.00 for it if it's a touchscreen. Then you can go buy an alpine.

It's the maps and bad surveys. I have three GPS units by different manufacturers and they all are off. You also have to remember there is a built in error which can be better or worse depending on sattelite reception.

It also depends onwhere you are located...basically how many sattelites it is tracking....fewer sattelites equates to a greater distance estimation error...I am not going to even get into the algorythm built in to make it less acurate...which mkes it less accurate unless you have the required encryption key and a gps unit that is designed to take the encryption.

Ladies and gentlemen im not trying to start WW3 here just inquiring about an issue with my GPS. GM charges an over inflated amount for an underachieving product.

If the owners manual says its supposed to pinpoint accuracy then it should do just that.

How about if they cant fix it they blame it on the sattelite instead of not having an excuse at all.

Inferior products at a very steep price.And GM is in trouble its a no wonder why.

I will be trying an aftermarket GPS unit this weekend lets see if $299 works better than factory GM.

Ladies and gentlemen im not trying to start WW3 here just inquiring about an issue with my GPS. GM charges an over inflated amount for an underachieving product.

If the owners manual says its supposed to pinpoint accuracy then it should do just that.

How about if they cant fix it they blame it on the sattelite instead of not having an excuse at all.

Inferior products at a very steep price.And GM is in trouble its a no wonder why.

I will be trying an aftermarket GPS unit this weekend lets see if $299 works better than factory GM.

how much was the gm nav option? if its over the price of better aftermarket units then id agree with you.

im more of a paper map kind of guy, cant really go wrong with paper. remember paper doesnt glitch, just my excuse cause im too poor to have a fully loaded truck haha

Is this an 07.5 setup or Classic?

The GM unit I put in the wife's Denali is dead balls accurate.

Well I just stepped out to check mine and what do ya know??? Mine don't even give ya the house number:( I love my Pioneer (P7500 flip screen, dvd, tv tuner Avic 88 DVD nav) and I havn't had one problem finding a destination. I just made a trip to Hershey PA and not one problem. If yours is a touch screen, I'll raise the pot to 800.00 right now. Do you take Pay Pal???

The vehicle is my wifes 2006 DENALI it was factory installed.

The unit was dead balls accurate and then it went off track?

NO the unit is not 4 sale.

The unit works fine except for the pinpoint accuracy when you press the NAV button.

lol you guys kill me, what i wanna know is why it has to have a vss wire, all handheld units use the sat. signal for the speed and are very accurate from what i can tell. we have several gps units on farm equipment and use the speed from them to run spray monitors and planter monitors. looks like this thing would do the same-------just curious once again :)

lol you guys kill me, what i wanna know is why it has to have a vss wire, all handheld units use the sat. signal for the speed and are very accurate from what i can tell. we have several gps units on farm equipment and use the speed from them to run spray monitors and planter monitors. looks like this thing would do the same-------just curious once again :)
Tunnels, parking garages, backing up, 100 mph around curves, hard turns, obstructions, u turns... 3D calibration. They work fine without vss by constantly updating according to how many sats. you can see and triangulation. They are just better at estimated arrival times and so on with vss hooked up...IMO

i see your point but you would think that gps signal would be just as good other than in tunnels and parking garages. they work flawless in the fields for the most part

i see your point but you would think that gps signal would be just as good other than in tunnels and parking garages. they work flawless in the fields for the most part
Just as been stated here before... MILITARY HAS ACCURATE GPS..(at least more..so than civilian) We have built a few military vehicles and used their components and there is a difference. Just like the band width they have when it comes to mobile internet systems.

Accuracy depends on the number of satelites used and found, there are a dozen over the US. These are all picked up line of sight - buildings and trees etc will block them. Not sure if these GM units use the WAAS satalite which is low on the southern sky. WAAS adds correction that should get to within 10 feet accy aprox. Without the WAAS limit is about 60 feet or less if you can't see many satelites from the antenna. You could be losing accy because you can't pick up enough statelites.

GM specifically states in the owners manual PINPOINT gps navigation.Not recognizing the address my vehicle is parked at is FALSE ADVERTISING.

These units are expensive and do not live up to the claim.

I will be fighting GM for a monetary reimbursement based on system failure.

I will be fighting GM for a monetary reimbursement based on system failure.Good luck on that one.:rolleyes:

Every electronic maps I have ever used, whether in a GPS unit, computer software or the internet has built in errors in some/many addresses due to the inaccuracy of the information used to create the map as well as the age of the software.

Since roads are constantly being rerouted and new streets added when subdivisions are built, you will never be able to finding software that has every single address in the country down to pinpoint accuracy. Not even the military can get EVERY single address in the country with exact accuracy.

Try looking at the maps used by your city or municipality. You will be amazed at how inaccurate they are. If the cities can't get it right, what makes you think GM will be any better, when they get their information from the same place as the city.

You might want to spend your fighting energy on something with a higher degree of success, like making the sun rise from the West.

Well I didn't spend the $ when I ordered my truck , but did finally spend more on the aftermarket Pioneer avic-d3 .
It's doing the same thing as the gm factory unit.
It's off by a little in the driveway, but as you go to different place the accuracy improves.
I believe it'e like the other guy's are saying, it depents on where you are and the signal strengh .
No big deal, it got me where i needed to go so far and i can handle it beeing of by a 1/8-1/4 mile on the house number...........

Mine has pin point accuracy. To prove it, I took out a state map and stuck a pin where my street should be. The GPS was dead on. :p:

Please post back after you try the NAV in your vehicle. ThanksMy street isn't named on the 5.0 disc, nor are there any addresses - but it does show up and looks like I am where I would expect to be on the street.

...I am not going to even get into the algorythm built in to make it less acurate...which mkes it less accurate unless you have the required encryption key and a gps unit that is designed to take the encryption.
President Clinton turned off selective availability May 1, 2000
Just as been stated here before... MILITARY HAS ACCURATE GPS..(at least more..so than civilian) We have built a few military vehicles and used their components and there is a difference. Just like the band width they have when it comes to mobile internet systems.
We civilians have accurate GPS also. The question is how much do you want to spend? I use a pair of Raven Invicta 210's for navigation at work. Economical sub-meter GPS's $2000 each(our budget isn't big enough for the good stuff). That is for just Lat/Log speed and heading 10 times a second, to show you where your at on a map is more money.


GM specifically states in the owners manual PINPOINT gps navigation.Not recognizing the address my vehicle is parked at is FALSE ADVERTISING.
These units are expensive and do not live up to the claim.

I hope you don't believe everything you read.
These units are cheap.If you want a pinpoint accurate GPS navigation system in your truck, I would think it would raise the MSRP by at least $10,000.

BTW my TNR works great, I go out of town and don't get lost.

IMO GM needs to make a dead accurate GPS. Then when your vehicle is stolen, the thief can push the home button, go right to your house and get everything else.

The GPS pinpoint location does not work.Im sure many of you have the same issue you just never checked.

Park in your driveway and press NAV it should tell you EXACT location your address ie: 123 Main St.

The dealer is telling me this feature does not work properly.The owners manual lists this feature as a highlight of the feature.

Im awaiting a GM rep to call me back with more excuses as to why this feature does not work properly.

Please post back after you try the NAV in your vehicle. Thanks

Mine is dead nuts on! Exact address. I LOVE my GM Navigation unit!

Sorry you aren't happy with yours.

yes sub-inch accuracy comes with a price we have two deere gps auto-steer systems and they are 40k a piece

Yes im laughing at the response I got from a Gm Eastern Region rep.Who asks me what compensation would be acceptable? She mentions GM making a few months payments or pro-rating the NAV cost and reimbursing me the $$$$$$. HA HA HA laugh now.

The dealer is even willing to change out the unit and put in another or the upgraded 2007 version. HA HA HA getting funnier huh?

When I first bought the truck the GPS NAVIGATION was dead nuts accurate in my driveway,now its not. THATS THE POINT.

I did not get what I PAID for.

I purchase higher priced vehicles for a reason,so that all the bells and whistles perform up to expectations that GM advertises them to do.

Yes im laughing at the response I got from a Gm Eastern Region rep.Who asks me what compensation would be acceptable? She mentions GM making a few months payments or pro-rating the NAV cost and reimbursing me the $$$$$$. HA HA HA laugh now.

The dealer is even willing to change out the unit and put in another or the upgraded 2007 version. HA HA HA getting funnier huh.

Yeah thats funny, because there is no updated 2007 version. And even if it was, it cant make it more accurate because you are still limited to the accuracy of the GPS tranciever.

WOW a response within 24 hours from GM? And with that nice a response? I love GM, but I have a HARD time beleiving they would pay for your nav. :rolleyes:

A few months payment? Where do I sign up for GM to "just give me" a couple thousand dollars. :D

I know theres no way to prove that "GM did actually pay you" other than your word, and you can dispute it all you want, I still find this hard to beleive.

no offence to you, maybe others will voice their oppinion.

ben

Yes im laughing at the response I got from a Gm Eastern Region rep.Who asks me what compensation would be acceptable? She mentions GM making a few months payments or pro-rating the NAV cost and reimbursing me the $$$$$$. HA HA HA laugh now.

The dealer is even willing to change out the unit and put in another or the upgraded 2007 version. HA HA HA getting funnier huh?

When I first bought the truck the GPS NAVIGATION was dead nuts accurate in my driveway,now its not. THATS THE POINT.

I did not get what I PAID for.

I purchase higher priced vehicles for a reason,so that all the bells and whistles perform up to expectations that GM advertises them to do.


So what's her name? I challenge you to scan the check with you name blocked out if you want and post it here. Like you said you don't want a new nav, just the money. I have to see this with my own eyes!

I don't think it's a GPS/NAV problem... If you punch my address into any map site or program, it shows my house at the opposite end of the street.

Hey, mine stinks too! Who do I call? (think they will care that mine didn't come with a nav unit?) :D
Just give them a call. Tell them your unit is dead nuts accurate but advertised as pinpoint accurate. You will receive huge amounts of compensation even after laughing in their face.
If your truck didn't come with the nav unit, they will only give you the 2010 upgrade covering all the new streets that might pop up in the next three years.

The NAVIGATION unit is not performing properly as advertised by GM.

Is this simple enough for you to understand?

The dealer made 2 attempts to calibrate the NAVIGATION unit and tried numerous discs. Over a 2 month time frame.Are you still with me?

The service manager called GM tech support, they then suggested COMPENSATION in the form of monthly payments or 1 lump sum.
Am I going too fast for some of you?

The dealer I deal with is very reputable and over the years I have spent alot of money at their dealership.So with this all said the service manager is trying to rectify the situation 1 way or another.

And........the UPGRADED NAVIGATION is in the 2007 GM trucks its called NEW GENERATION according to GM its a totally different unit than the 2006.

With that all said done.This conversation is over.I WILL NOT TELL ANYONE THE OUTCOME REGARDLESS OF WHAT IT MAY BE. a-b-c 1-2-3 still with me?

The sad part is SOME of us use this forum for helpful information pertaining to our vehicles,while others take out lifes frustrations by ridiculing posts and other members threads.

Have a nice day.

Well your reputable dealer is an idiot because there is no way to install a 2007 nav unit in a 2006 truck/SUV

I wish you the best of luck though

Dan,

Seems liike you're pulling the plug on this thread. Some fellows called you on the carpet to show proof of your "compensation" and suddenly you're taking your ball and going home. As you said this forum is used by many for "helpful" information. Don't get all bent out of shape because some of us have good bullsh*t detectors and aren't particularly interested in unhelpful rants. Man up. Post the proof or sell that damn thing to someone who will appreciate it for what it is. And next time you post, think about where you're going with it before you get in over your head.

Dan, sorry you feel so offended by our posts. If you left out the part demanding monetary reimbursement and the “H Ha Ha” , “am I going too fast for some of you” and “a-b-c 1-2-3” you might receive a friendlier response.

If we keep the conversation going, it might help out the next guy asking the same question. I have only made about 30 posts but I feel I have helped many people. Even Ben “Godfather of TNR” has been watching this thread. There is nothing wrong with your Nav unit. If there was a fix to your problem you would have gotten the answer here.

It’s been posted over and over it’s the maps. The disc doesn’t contain the Lat/Long of every address in the US and Canada. Your unit is taking an educated guess. I’m sorry you feel cheated but you’re going to have to learn to live with it.

Try typing that phony address it gives you into Google Earth. I’m willing to bet it will put an X close to your house.
Here is Google Earth’s explanation.
We're aware that some addresses are not roof-top accurate. This is the result of how addresses are matched up to an exact position on the earth. We rely on a technique called "address interpolation," which is a fancy way of saying that we take our best guess. More specifically, we take the total number of addresses in a given block and assume an even distribution of the addresses along that block. For example, if there are ten addresses for the 800 block of Main Street, we assume that the fifth address is located at the halfway point.
Ideally, we'd use a database that could precisely match addresses to their rooftops, but unfortunately, such a database doesn't exist. We hope to have a system in place in the near future that will allow users to correct their location search results.
I'm sure Gm is using a similar interpolation method.

The navigation unit worked perfect months back all of a sudden it went off line.The dealer made 2 attempts to recalibrate the unit.He then offered the settlement based on the outcome.I have yet to recieve anything from the dealer or GM.I told you what they told me,even the part about UPGRADING the NAV unit.It may very well be hogwash.

For those who seem to believe im making this stuff im not.For those who trully also have navigation issues also.I will post the outcome.

Have a nice day.

I am not going to even get into the algorythm built in to make it less acurate...which mkes it less accurate unless you have the required encryption key and a gps unit that is designed to take the encryption.
I thought the lowered sensitivity thing was taken off GPS years ago. True, when they first came out the civilian versions were less sensitive than the military versions, but no longer I think.

THE GPSs are plenty sensitive, its the maps. Even my cheapo GPS will show where I made a lane change on the interstate.

The navigation unit worked perfect months back all of a sudden it went off line.The dealer made 2 attempts to recalibrate the unit.He then offered the settlement based on the outcome.I have yet to receive anything from the dealer or GM.I told you what they told me,even the part about UPGRADING the NAVY unit.It may very well be hogwash.

For those who seem to believe I'm making this stuff I'm not.For those who truly also have navigation issues also.I will post the outcome.

Have a nice day.
I for one don't believe you are making this up. I do think that you have been misinformed about the accuracy of civilian GPS units and the mapping technology that is available today.

It is possible that in order to retain your business, your dealer will do whatever it takes, even if it means that he will reimburse you for the price you paid for your NAV unit. Time will tell if you are successful in getting reimbursed. Please, let us know if you do get reimbursed for this. But even if they install an upgraded 2007 NAV unit, it will still show some drift depending on satellite position and atmospheric conditions. There simply is no way around this.

What we are saying is that the mapping technology available today will NOT give you the accuracy you desire. If at some time in the past you were able to get the "PINPOINT accuracy" for your home address, it was simply a lucky hit. It is possible that in the future, if the satellites are line up just right and the atmospheric conditions are perfect, you might get it again, but I can tell you that with today's technology no one will be able to guarantee that kind of accuracy every single time you push the button.

No one has a database containing the LAT/LON coordinates for every single address in the nation, not even the military. Even if they did have it, the inherent error in the GPS technology will not give you a perfect hit every time, unless you spend tens of thousands of dollars for a surveying unit that is going to require extensive calibration every time you use it. If anyone is telling you otherwise, they are simply lying to you. As stated before, the majority of addresses are obtained via interpolation and for the most part this is good enough for civilian needs.

I wish you the best in your endeavor.

The navigation unit worked perfect months back all of a sudden it went off line.The dealer made 2 attempts to recalibrate the unit.He then offered the settlement based on the outcome.I have yet to recieve anything from the dealer or GM.I told you what they told me,even the part about UPGRADING the NAV unit.It may very well be hogwash.

For those who seem to believe im making this stuff im not.For those who trully also have navigation issues also.I will post the outcome.

Have a nice day.
Maybe one or two of the sats are down or not operating at peak efficiency. Maybe your sensor is dirty. Maybe it is a humid time of year. Maybe a lot of things.

I can understand:
1) being miffed that it isn't "pinpoint" accuracy
2) being miffed that some here are skeptical

But really! Almost everyone on the planet, when seeing that their state of the art satellite navigation system tells them their neighbor's street address instead of their own would just go "hmmm, off a bit".

But GM is offering you more than $1,000 and/or new equipment and you STILL aren't satisfied!? I am amazed that GM is offering all that to you, but I am even more amazed that you still think you're being ripped off. For 20 feet off on your position located somewhere on the surface of the entire planet Earth!! If you took this in front of a judge you wouldn't get a dime.

In my opinion "pinpoint" is a wishy-washy analog kind of word and you are placing too much emphasis on it. You really would not expect to locate your truck to the nearest fraction of a millimeter, would you? That's a true "pinpoint". In WWII pinpoint bombing meant you hit the city you were aiming at. In ICBMs pinpoint was a few hundred yards. For you, its a few feet off your actual address.

The "I don't believe it" comments to you were too harsh and were uncalled for, sorry about that. Generally people on this site are friendly and helpful (but stay away from the Politics and Religion area!!:) :) ), but sometimes there is a slip up.

If GPS was that accurate, even for the military then our troops would simply enter a known long/lat coordinate push the big red button and walk away. That's not the case. We put men in harm's way regularly, putting them well into enemy territory to "paint" targets with laser illuminators. Even that technology is limited by rain, fog, sandstorms etc.
I can appreciate this dudes disappointment, my DIC is regularly off by +/- 5% (as soon as I hear this cat divulge his secret contact at GM I'm calling her on that one) but come on.

Wow... What a thread.

Mine shows my house a 1/4 mile down the road. Had my 20 acres been split up, my house may have very well been where they show it (I guess they pick a point in the 1 mile gap between houses:confuzeld ). I had to put a flag to my true "home" position. When I return home, everytime it is dead nut on the flag. Several trips across the United States, my GM nav unit has worked flawlessly getting me to places I've never been before... Even in the pitch black midnight hour towing a camper. Sometimes it would be dead on, other times it would be a few addresses off (Example: going to 123 any street, nav says I've arrived, but I'm actually at 112 any street. Drive another block & there.).

Try this: Mapquest your house, Google Earth your house, (your address). I bet they are off also. Both show my address on different parts of the street.

Anyway, am I understanding you correctly, that your Nav used to be accurate and now it is not? If so, it is a question of what has changed, be it a mechanical malfunction, software glitch or something as simple as you installing window tint on you truck.

The navigation unit works flawlessly and has gotten me and my family to places all over without a gliche. Turn by turn directions unreal.

I like the unit so much I wish I would have gotten it in my Sierra 2500 hd. I even looked at units on e-bay.

The only flaw is the pinpoint gps navigation that used to be dead nuts accurate.I can live with that.

I complained the dealer made an effort to repair it was unsuccesful and the GM rep actually made the suggestion of compensation in some way shape or form.

I will advise of the outcome for other members who are experienceing the same issues.

I will ignore the jokesters who rally only join these informative sites to bash others.

Peace out and God Bless America!!!

. But even if they install an upgraded 2007 NAV unit, it will still show some drift depending on satellite position and atmospheric conditions.

There is no way to install a 2007 nav unit in an 03-06 truck

There is no way to install a 2007 nav unit in an 03-06 truck

Then I was obviously given the wrong information on that.

The NAVIGATION unit is not performing properly as advertised by GM.

Is this simple enough for you to understand?

The dealer made 2 attempts to calibrate the NAVIGATION unit and tried numerous discs. Over a 2 month time frame.Are you still with me?

The service manager called GM tech support, they then suggested COMPENSATION in the form of monthly payments or 1 lump sum.
Am I going too fast for some of you?

The dealer I deal with is very reputable and over the years I have spent alot of money at their dealership.So with this all said the service manager is trying to rectify the situation 1 way or another.

And........the UPGRADED NAVIGATION is in the 2007 GM trucks its called NEW GENERATION according to GM its a totally different unit than the 2006.

With that all said done.This conversation is over.I WILL NOT TELL ANYONE THE OUTCOME REGARDLESS OF WHAT IT MAY BE. a-b-c 1-2-3 still with me?

The sad part is SOME of us use this forum for helpful information pertaining to our vehicles,while others take out lifes frustrations by ridiculing posts and other members threads.

Have a nice day.

Watch it pal. Ben may be the Godfather, but I know a boatload about these units too. See my sig. Ive helped more people on this forum than you can count. If anyone is venting their frustrations on this board, its the person you look at in the mirror every morning, not us. Your insults are not appreciated at all.

Now, to try to help, maybe (and I mean maybe) your Nav unit has developed a glitch in one of its boards that is causing the calibration error, but its doubtful. In this case, chances are better that the unit wouldn't even read the disc. I suspect, as many others have said, that civilian GPS is just not "dead on" accurate enough for you. Maybe the one post about the GPS satellite serving your area not being on-line is accurate too.

Your dealer should just replace the unit. Why didnt they in the first place? Your truck is still under warranty, right?
Why they would offer any kind of monetary compensation is beyond me, and you should be kissing their behind if this is really the case.

'Nuff said.

Watch it pal. Ben may be the Godfather, but I know a boatload about these units too. See my sig. Ive helped more people on this forum than you can count. If anyone is venting their frustrations on this board, its the person you look at in the mirror every morning, not us. Your insults are not appreciated at all.

TheBac, in fairness he WAS practically accused of lying when he tried to tell what GM told him. I'm sure he did not appreciate that either. I know I would not have. I think if you are going to tell people to watch it you should also say it to the two people who started all this by implying he was lying. He said nothing snarky to anyone until that happened.

Chuck

Thats the last negative post that this thread's gonna get. One more and its getting shut down...People dont need to read through 10 pages of b.s. sarcasm to find a valid answer to a valid question. If you all feel the need, do so in pm's, not out in the open. And in closing, if one cannot say something constructive, dont say anything at all. At this point on, any off topic post will be deleted.

Clean it up amongst yourselves...You are all adults.

In our defense, and in no way is this meant to be a negative post or is any disrespect meant.
The gentleman wrote "GM charges an over inflated amount for an underachieving product." that's not etirely true when you compare it to its competitors that for the same money will not integrate with the factory controls. He then wrote "Inferior products at a very steep price.And GM is in trouble its a no wonder why" This too is inflamitory and again when compared to the competition, not necessarily true. In this response he implies that HE is in communication with the Eastern Rep "Yes im laughing at the response I got from a Gm Eastern Region rep.Who asks me what compensation would be acceptable? She mentions GM making a few months payments or pro-rating the NAV cost and reimbursing me the $$$$$$. HA HA HA laugh now." but then follows that up with a remark to the contrary stating that it is in fact the dealer that is in negotiations "The service manager called GM tech support, they then suggested COMPENSATION in the form of monthly payments or 1 lump sum. " And after all that he throws us a curve ball with this statement "The navigation unit works flawlessly and has gotten me and my family to places all over without a gliche. Turn by turn directions unreal. I like the unit so much I wish I would have gotten it in my Sierra 2500 hd. I even looked at units on e-bay."
So forgive us our sarcasm, we are simply trying to keep one member from casting a dim light on an amazing piece of modern engineering. All in an effort to protect potential buyers of this marvel.

In all due respect and without negativity.

Don't ***** about quality of a product unless there IS something wrong with it. Thats what i say. A few numbers off big deal... infact i wish it was MORE!! Think if stuff like this could make it into enemy missiles... i would rather it be off enough so that it would be useless for enemies to try it.


:thumb:

The GPS pinpoint location does not work.Im sure many of you have the same issue you just never checked.

Park in your driveway and press NAV it should tell you EXACT location your address ie: 123 Main St.

The dealer is telling me this feature does not work properly.The owners manual lists this feature as a highlight of the feature.

Im awaiting a GM rep to call me back with more excuses as to why this feature does not work properly.

Please post back after you try the NAV in your vehicle. Thanks


Here is the original starting thread.What was negative????? I asked others to check out their units and reply back. MANY became offended or implied I was lieing,for whatever reason I cannot imagine.

Wow... What a thread.

Several trips across the United States, my GM nav unit has worked flawlessly getting me to places I've never been before... Even in the pitch black midnight hour towing a camper. Sometimes it would be dead on, other times it would be a few addresses off.

Try it in SE Texas!!!



Big Max

Ok guys last chance before this one gets closed...

thanks
ben

I'm sticking with the address interpolation theory.

I would leave GPS precision out of the equation. You don't need decimeter accurate RTK GPS, when your lot is 50-100 feet wide. Of coarse the more precision the better.

I live in a small subdivision (two streets). the first house on the street is numbered 98 the last is numbered 134. So this morning I go down the street dead slow pressing the Nav button. The first address it gives me is 20 the last address it gives me is 199. So thats 180 addresses and yet there are only 35 houses on the block.

So obviously the database for how many houses on my street is wrong. I get the same results with Google Earth. They must be using the same database.

Drew

I understand and believe your theory IF it never was accurate thats one thing.But it was dead on accurate when parked in my driveway a few months back.

I called the GM dealer this morning and im awaiting a reply.I mentioned changing out the unit as Im still under warranty.

Will advise of the outcome.

Guys lets keep it real here.This is a great site with valuable information.
Though we all may not agree.

Peace out everybody.

without a correction signal its not going to be dead nuts on all the time, this may be part of your problem. i can park a tractor out in the field, and when i park it dead nuts on the line where the gps tells me the correct spot is. well, when i come back after lunch i know nobody as moved the tractor and i crank it up and lots of times it will tell me that its not on the exact spot that it was parked in. the satalites are constantly moving up there and get off from time to time. this is why we use rtk base stations to take out the variances.

you will notice this with your nav system if you have your home designated on the system notice from time to time that when you start out the lil house on the screen isnt in the exact same spot all the time. i designated my home with the truck parked in the driveway where its always parked and from time to time i would have to get into the front yard to make the lil arrow line up with the house ;)

Ok heres the scoop.

Im was offered 2 months payments approx $1100 for the faulty navigation unit.I then questioned as 1 member wrote ask for the unit to be replaced its under warranty.The service manager said no problem,make a decision and call him back when we decide.

Tough decison 2 months no DENALI payments or a new NAVIGATION unit that may do the same thing.

That would be an easy decision for me, take the money if you can keep the nav unit, a new one won't do any better.

X2

The database DVD is what is driving off your address, the GPS, I guarantee is more accurate than you need it to be. But the database, with it's billion point error liklihood, is only as good as the surveyors efforts.

Do yourself a favor, look up your address on mapquest, and come up with a way to plot your lat/long. I bet mapquest is off also. There is a reason for that. The database is a commodity, bought and sold for many applications, and it is on the DVD, not the hardware.

I would take your money and run. I have compared mine to my lowrance units also and every one seems to be a little different. I don't know if these units are WAAS enabled but if your off just a little on the address I wouldn't worry about it. I have had mine show me down the street sometimes and right on others. GPS is great but it is limited by the equipment. We use it for our surveying and inorder to maintain the "pinpoint" you need a base station. It sounds like your unit is working fine.

What exactly do I need to say to have this thread closed:joke: :grd:

What exactly do I need to say to have this thread closed:joke: :grd:

I Think It's Fun.

I tested this out yesterday when the wife and I took the kids out for icecream cones.

At the ice cream store, which has an address of 327 S Waverly, my nav unit showed us at 3824 W Kalamazoo. This is about 100 feet give-or-take from where we really were, on the intersected cross street. So the GPS was off there. It did show us off the main road the correct distance that we were in the parking lot.

I also checked my "home" address, and it is indeed off by 10 digits. I did not attempt to change it in the nav to get it more accurate. This number would be my neighbor's address, so its within 100 feet accuracy there. So 100 feet must be the "range" that the GPS has in our area.

So DMM has a point about accuracy, but IMO its not bad enough to warrant getting upset over it. Would I not be able to locate my destination because of the above inaccuracy? No.

do any of you guys nav system show you going off a ramp when you go by one on the freeway. theres one neear me that i go by almost daily that the nav will show the lil arrow going down the ramp and onto the service road then in a few seconds it jumps back onto the freeway.

Yep..mine does that too. Then the GPS updates and the icon flips over onto the freeway.

Question for Tom and Ben,
Dan says his unit had the address correct in the beginning and now it is different.
What would happen if he did a program clear, memory clear or a system reset from the diagnostic menu?

my nuvi is off to, so what.

Question for Tom and Ben,
Dan says his unit had the address correct in the beginning and now it is different.
What would happen if he did a program clear, memory clear or a system reset from the diagnostic menu?

From DDM's posts, I think the dealer already tried that, with no luck. They could just install another navi and see if it works correctly, too.

I have two different GPS units that I use regularly. One is a Garmin and the other is a Magellan. (My Garmin unit originally carried a MSRP around $1,200 when it first came out) -- I have pressed the pinpoint button at my driveway on both units after allowing them to remain stationary for over a hour in order to give them time to stabilize. In every case, when I returned home and parked the truck in the same exact spot on my driveway, both units have been off. Some times the error is just 5 to 10 feet, but other times I have seen more than 100 feet of drift. It all depends on the location of the satellites and the atmospheric conditions at any particular time.

The surveying GPS units that I have seen in use, would place a receiver at a known physical reference point and then would electronically calculate a correction factor that was sent to the surveyor unit. This is similar to the way that the U.S. Coast Guard Differential GPS (DGPS) system operates. These surveying units can repeat within a few centimeters, but they cost several thousand dollars and require a significant amount of calibration every time they are used.

Standard civilian GPS is generally good within a 100 meter radius (328 feet). A WAAS-capable GPS receiver can give you a position accuracy of better than three meters (approx < 10 feet) for 95 percent of the time, but it still is at the mercy of satellite positioning and atmospheric conditions. This is more than adequate for typical civilian use and is more accurate than the mapping databases available today.

If GM were to offer me TWO months payments or replace the NAV unit for a new one, I would be inclined to take the money, particularly if they allow me to keep the old unit, 'cause a new one will not be much more accurate for what you want.

As I stated on a prior post, if the current unit did give the exact address before, it was generally a lucky hit. Particularly when you consider the inaccuracies built into the mapping databases available today. NO ONE has the LAT/LON coordinates for every single address in the country. Even streets and highway intersections get moved from time to time when DOT changes things around, so you will never have a GPS unit that depends on any current mapping database, that is "dead nuts" at every location in the planet.

Obviously this dealer wants to retain your business. He knows that a new unit is not really going to be a whole lot better than what you already have. But he is willing to show you that he cares about your repeat business so he will forgo a few hundred dollars in hopes that you will continue to buy from him (This is good!). However, I wouldn't expect GM to pay for any future warranty work on THAT particular unit if you take their buyout offer. But then again, the dealer will do whatever it takes to retain your business, so who knows what could happen then. I would say you have a good dealer there.

do any of you guys nav system show you going off a ramp when you go by one on the freeway. theres one neear me that i go by almost daily that the nav will show the lil arrow going down the ramp and onto the service road then in a few seconds it jumps back onto the freeway.

My Garmin will do that, especially if I'm "following" a route, and I don't go where it wants me to go):h

My Garmin will do that, especially if I'm "following" a route, and I don't go where it wants me to go):h
My GPS does that. I think it only updates with the satellites every few seconds. In between it guesses based on a straight line course which is fine 99% of the time, but if you happen to be at a split in the road it may guess wrong. At the next sat update it catches up and puts me back on the road. That's my theory anyway.

I tested this out yesterday when the wife and I took the kids out for icecream cones.

At the ice cream store, which has an address of 327 S Waverly, my nav unit showed us at 3824 W Kalamazoo. This is about 100 feet give-or-take from where we really were, on the intersected cross street. So the GPS was off there. It did show us off the main road the correct distance that we were in the parking lot.

I also checked my "home" address, and it is indeed off by 10 digits. I did not attempt to change it in the nav to get it more accurate. This number would be my neighbor's address, so its within 100 feet accuracy there. So 100 feet must be the "range" that the GPS has in our area.

So DMM has a point about accuracy, but IMO its not bad enough to warrant getting upset over it. Would I not be able to locate my destination because of the above inaccuracy? No.

Check out my Nav's accuracy Tom... I guess I can get $1100.00 back and keep it too! :D

The Home icon is what the Nav calls my address, the "flag" is my actual parking spot and if you notice, the wife is parked in my spot and you can actually see I'm one space over and slightly forward. Yeah, I have issues too. It's off by about 2 feet.

Sorry guys I have to say it...

I figure taking the money is like stealing from GM. Only because you all know all GPS are like that. If you going to take the two months payments I hope you buy a Toyota next time.

And please don't tell us you didn't start this post negative, look at the title.

I'm still trying to figure out his definition of "pin point accuracy". If one clicks, touches, (whatever you call it), the emergency key, it gives you Latitude and Longitude down to the degrees, minutes and seconds. That's about as accurate as you are going to get with any civilian GPS unit (WAAS enabled too). Mine always shows the vehicle icon right on the tip of the flag when I park my truck in it's parking space, and has done so since installed 2 years ago.

I have seen issues with people installing window tint and it's effects on the navigation. Going to a larger tire messes with it also. I donno what to say.

I guess if he has issues as I just identified above with it's accuracy (picture with my home address vs. my actual home), he's got problems. My garmin does me no better. It puts me on the other end of McMullen road. If I'm too blind to see the big 4002 on the mail box, I guess it failed me also. If he's saying it used to put him at his driveway and now it doesn't, I would take them up on their offer of a new unit.

Has he tried an updated or older Nav DVD?

D3 -- so you're parking out in the middle of a field next to the house?

Maybe thats the inaccuracy in the Md area. Who really knows....

As with anything man-made, theres bound to be something in it that eventually screws up.

D3 -- so you're parking out in the middle of a field next to the house?

Maybe thats the inaccuracy in the Md area. Who really knows....

As with anything man-made, theres bound to be something in it that eventually screws up.

Yes, it was a field... My driveway is 1,100 feet long. I'd be happy if the "home" icon was at my driveway's entrance, but what is one to do? What really "stinks" is the field in front of me is split into two 10 acre building lots. When houses are put there, people in the future will arrive at someone else's house when they punch my address in... Of course, only if I don't buy the lot first. :D

I've attached an arial photo of the "field" I park in.;) I park just in front of the red Cavalier (if you can make it out). This is an old photo (2004). I'll have to fly over again and take an updated picture. All new asphault and new landscaping... Shouldn't be an eyesore now. :o:

I am under the impression that the US Government intentionally degrades the accuracy of the GPS system when it chooses to, and especially during war time. The military can resolve whatever degradation has been applied to restore pinpoint accuracy.

I remember reading a few years ago that the military had intentionally degraded the system's accuracy for security reasons. One of the degradations came after a guy flew a small aircraft into the side of the White House while Clinton was in office. I'm sure they don't want someone sending a GPS guided rocket right through a window of the White House or Capital Building.

I will say that the systems that are in my other non-GM cars do not indicate that I'm on a ramp when I'm on the freeway like this GM system does.

I have a question and a 'problem'. My problem is when I am driving on the interstate, I will have the voice tell me to stay on the interstate. She will tell me about 3 times in less than a mile. That gets annoying. I was wondering if the GPS is thinking I am on the southbound side when I am actually on the northbound side? In the city it works fine. I did take it in to have that looked at and they said it was normal. There was no off-ramp or cross roads in the area, so I am not sure why it keeps telling me to stay on interstate.

My question is, does 'Onstar' use the same system? If you have a medical emergency, being off by a block would be a bad thing.

I have a question and a 'problem'. My problem is when I am driving on the interstate, I will have the voice tell me to stay on the interstate. She will tell me about 3 times in less than a mile. That gets annoying. I was wondering if the GPS is thinking I am on the southbound side when I am actually on the northbound side? In the city it works fine. I did take it in to have that looked at and they said it was normal. There was no off-ramp or cross roads in the area, so I am not sure why it keeps telling me to stay on interstate.

My question is, does 'Onstar' use the same system? If you have a medical emergency, being off by a block would be a bad thing.

I will answer your two part question... First, mine does the same thing... you are going down the highway and the voice comes on and tells you to stay on the highway. If you notice, the blue highlighted route comes to an end and another begins. I guess it's a seam in the mapping software. There is a couple places on the Baltimore Beltway that are like that. The wife laughs because the "seam" (I'll call it) is on a stright-a-way with no exits for a couple of miles. The voice just says "keep straight ahead" twice, then as we cross the end of the blue route and into the other, it says "straight"... Cracks her up every time.

Second... The Onstar uses cell phone towers and triangulates your signal to pinpoint your location, much like the WAAS function on more expensive GPS units.

Hope this answered your question(s).

I am under the impression that the US Government intentionally degrades the accuracy of the GPS system when it chooses to, and especially during war time. The military can resolve whatever degradation has been applied to restore pinpoint accuracy.
does.There is intentional drift in the signals (or was) to reduce accuracy. Many GPS units have something called pinning that makes the drift disappear on your screen - if you turn it off you ( on units that have the option ) you can see the drift which shows up as your location moving around. It can be degraded further or shut down by the military of course.

Yes, it was a field... My driveway is 1,100 feet long. I'd be happy if the "home" icon was at my driveway's entrance, but what is one to do? What really "stinks" is the field in front of me is split into two 10 acre building lots. When houses are put there, people in the future will arrive at someone else's house when they punch my address in... Of course, only if I don't buy the lot first. :D

I've attached an arial photo of the "field" I park in.;) I park just in front of the red Cavalier (if you can make it out). This is an old photo (2004). I'll have to fly over again and take an updated picture. All new asphault and new landscaping... Shouldn't be an eyesore now. :o:

That looks like most of my route....farms/fields/houses wayyyy off the road....:lol:

Gents, I hate to be the bearer of bad news but I just took out yet more insults that didnt need to be here. This thread did have some useful posts in it and I hope that some of us learned from them, while the thread was kept sane.

29 deleted posts in 9 pages is rediculous....

This one is done...