A GPS receiver receives radio signals from at least 3 satellites, and then can compute your exact position, usually to withing 30 feet. You have the option of buying a C6 with a NAV (navigation) system installed already, but personally I don't think that's the best idea. My reasona are (1)2 years after you buy the car, whatever was installed in it is obsolete - the portable units available each year will continue to improve while you're permanently stuck with an old outdated system, (2)it's not portable - unlike one that you can buy separately, tuck in your pocket and use while walking, riding a bike, motorcycle, and even transfer to another car.
Finally, the prices on portable GPS receivers continue to drop all the time, so for $600 or less, you can get something FAR better than will ever come equipped on the Vette, where a GPS is an option that costs $3000.
There are lots of reviews and information on the web about which unit to buy. Here are some of my most helpful links:
Cnet.com reviews the Garmin Nuvi 350
See the list of actual users' favorite GPS devices
I think it's perfect for what I need. Touch screen allows you to program your target location with a few touches of your finger. If you stray off your planned route, the Garmin automatically recalculates the best route from your current location. It has a voice that will tell you well in advance when you should look for the next turn - then as you approach will tell you "turn left". If you need to find the closest ATM, or restaurant, or gas station, it will do that for you with a touch of the screen. Also, there is no problem plugging it in to a cigarette lighter adapter plug in the C6, but you'll find that the Garmin's own battery lasts about 4 hours on a full charge, so charging in the car is rarely necessary.
You can fit this in your shirt pocket comfortably. And with a Belkin universal cupholder mount, it fits quite nicely in the C6.
You should be able to get this unit for less than $600, and the prices will continue to fall. You really don't need anything more fancy nor more expensive than what this unit provides.
For now I'm using the "Belkin F8U0802 OmniDock-L Vehicle Dock for Handheld Devices". Do a search in Google and you'll likely find one for $17 or so. The unit comes with it's own mount, suitable for the dashboard or windshield, but I prefer the cupholder mount. Here are some pictures.
The Belkin F8U0802 is made for PDA's. You'll have to pry apart the little arms just a little bit to fit the Garmin Nuvi 350's width, which is 4 inches. But as you can see in these pictures, the fit is pretty good, if not perfect. Certainly it is stable enough so the unit would never fall out.
If interested, click below at buydig.com - they usually have some good deals on GPS devices.,
