Advice for Buying an Car GPS System

...The GPS system calculates your current position by using satellites
to locate your latitude and longitude. You will never have to worry
about getting lost again and they can even help you locate gas
stations, restaurants, hotels and more...
http://personaltechinfo.googlepages.com/suggestions_for_buying_an_automobile

jennyjenny wrote:

Get on with its own battery, in case you want to be able to find your
car in a huge parking lot, or take a walk down a nature trail, or go
camping. Larger screens are better (but more expensive). If you need
it for driving instructions, make sure the audio is loud enough to be
heard in your car.