I have less than a week in my C7 and decided to check out the Nav system and how it works. I have a Tom Tom in my other car and know it's accuracy. I set up my preferences and selected fastest route.

Was making a trip to destinations that I frequent just to check it out. First was to the library and all was good until I stopped at a cross street light and the Nav said to turn left and the destination would be on the right. The library was actually straight ahead about 100 yards on the left.

Then setup a destination thru some country roads to the interstate. All was good until I got near the destination. I was approaching the interstate exit that would be the correct one and the nav said to go on to the next exit about a quarter mile. That exit is not faster nor closer since I would have to double back on city streets.

What is your experiences with the accuracy of the C7 Nav and is there a better preference like nearest/closest route instead of fastest?

 

I haven't noticed any problems with my nav system, but I haven't used it much either.

I've always found that I could "beat" any of my nav systems in areas where I was familiar with the roads. I've always used it to help me find my way to new destinations. However, I have no way of verifying it took me the fastest route since I didn't know the roads. Always got me there though.

Be wary of using the shortest route option. That can get really interesting and frustrating.

 

Mine has always got me to my destination without any problems. I always review the route before hitting go. Yes the shortest route could be interesting! I use my navigation system quite a bit, two destinations on today's drive. Four destinations on the previous outing. I find the system to be user friendly once the initial learning curve is negotiated.

 

I agree with posts 2&3.

 

Tony - Is the GPS in your C7 experiencing the Red-X issue? (Red X over the letter "GPS" on the screen). And if so, have you had the rear view mirror mod done by your dealer yet?

 

GM's NAV systems have always been crap. I don't understand why car manufacture's just don't buy rights from Garmin and pass the extra cost on. Even my Durango uses Google Maps but still not as good as Garmin!

 

Gee, mine works fine as did the one I had in my C6.

Not bad for crap, eh?

 

That's not accuracy, that's routing logic. Accuracy is whether you are where the nav system says you are. If you are in your driveway, and the system says you are 1/2 mile down the road, it's inaccurate. Very few GPS based nav systems are inaccurate, unless they have antenna problems, such as the Red-x problem some '15 vette owners are experiencing. You can also have database error, where the database says a location is somewhere other than its actual location. Again, not inaccurate navigation, but a bad database.

All this is just semantics, but as a commercial pilot using GPS nav systems all the time, it can be a life and death difference.

 

 

And my Garmin would continually have me to getting off at each exit on the interstate and getting right back on because it thought that was faster.

 

I don't have any complaints about the logic of the the C7 nav system. Hasn't steered me wrong, yet. (But hey, I don't have many miles on the car, yet! )

Not sure about the perfect system to which this is being compared. It's mostly a matter of learning the system.

 

Been all over the country in mine including 3 cross-country roadtrips and overall I've been impressed, especially regarding weather and traffic reroutes. I wouldn't say it's flawless, but no piece of technology is. I'd say there has only been one instance when I disagreed with the route it gave me...but I still arrived at my destination!

 

This.....this right here!


Mine is fine-no problems or issues.

 

My 2014 C7 Nav system is horrible... Gives incorrect directions... Often can't find business names or addresses that other Nav systems find without issue. I have the GM Nav in my 2014 Sierra Denali and it works fine... The Nav in my 2013 ZL1 Camaro worked fine... But this Nav in the C7 Corvette is the worst POS I've ever had.

Very disappointing.

 

I have only noticed the red X a few times while in the garage, thought it was startup error while searching for the satellites. Have not had a mirror modification done, new car with only a week in it. Is there a bulletin that you can point me to.

Trying it out again today and Wednesday. Both of the mistakes that I have seen are not encouraging. My Tom Tom sometimes gives a stupid route but will pin point the destination when you get there.

I'll watch for the Red X as I go forward.

 

IMHO, It performs well as far as getting where I want to go.
It does work 'different' than dashmount units.

In some cases, it has correctly located residential addresses that my tomtom says do not exist. (on roads that are 40+ years old, no less). In another very specific case, it shows one residential road as having a "break" in the middle, but the road has been complete for at least 30 years.

Once I figured out give it the entire address in one long phrase instead of 3 separate strings (number, street, city), and multi-digit numbers should be read complete (one thousand instead of 1-zero-zero-zero) programming went much faster.

Programming by POI was difficult, mainly because I didn't know how to 'categorize' some of the location(s) I was seeking.

I like the ability to set more than 3 waypoints, and the ability to set (and change order of) waypoints on the fly. Although it displays time to final destination, not the next waypoint.


Distance to next turn has always been spot on.
traffic avoidance is also accurate.

Sometime routing is interesting, depending on other settings.
For example, if you have "avoid toll roads" set ON. but get on a toll road anyway, it will tell you to take every exit, and reroute accordingly.

 

Tony - There is no bulletin, TSB, or recall concerning the C7's Nav "Red X" issue that I'm aware of, but it seems GM is slowly getting the word out to the dealerships about how to fix it. If you find you are having the Red X problem call your dealer to find out if they are aware of fix, if they are not, have them contact GM and get the information, and I suggest you confirm your dealership has this repair information before you take your C7 in (you don't want them experimenting to find the fix).

I called my dealership last week and was told they had been contacted by GM have the repair information. Mine is going in for the Nav fix this week. I'll post the results.

 

Looking better today. Made a trip to a store in a nearby town. Nav performed flawlessly and nailed the store location. Programed my home address to come home and it again nailed the location via the expected route.

Going again on Wednesday and will try that one. Maybe it will be OK.

I want this thing to work great and give me some trust.

 

My NAV has worked very well and I have not had any issues to date. Also, I love the weather overlay along the route for long distance drives.
The only issue I have just requires a database update for a recently completed connector between GA400 and I-85 North bound. It has me getting off on the side streets I used to used before the connector was complete.
In Tampa, however, the recent road construction updates had been included. So it just depends on when the updates for the different areas I have been in were appended to the map database.
I can live with the little things here and there and will probably update in 2016 as I really see no need to update every year (Even in my Jeep GC I only updated the SW every other year or so, but I did have more issues with the nav system rebooting every time I was in the North Atlanta area to the East of the GA400 connector ... now that was annoying until the SW was updated to fix that issue).
As for Waze, that application gets annoying when it tries to route me through neighborhood streets with speed bumps (I absolutely hate cutting through people's neighborhoods like that). One time Waze routed me through back neighborhoods and I cam out way behind as I saw that same city bus I was next too blow by while I was stuck.


PS ... Never had the Red X even though I have the PDR. Looks like the camera interference issue was resolved in the plant before mine was built (#8875 here).

 

I'm warming up to my Nav now. I made a trip Wednesday with three programmed destinations and it nailed all three. So, maybe it was just having a bad day on my first post.

I really like the voice commands. Startup, push the button and start talking, before the first stop light it is programmed. Learning the methods makes it really easy. I use it every time I go out, even if I know where I'm going just to check it.