The Global Positioning System was developed for government and military use, but has many applications in the civilian world. Vehicle GPS units use satellite technology to improve navigation during trips. These types of devices feature color displays, and usually show a moving map of the surrounding area. According to USA Today, three of the most popular car GPS brands are Garmin, TomTom and Magellan. Modern vehicle GPS units can be easily mounted on the windshield and do not require permanent installation. Tips Warnings Writer Bio
