The Garmin GPS devices are also helpful during fishing, hiking or hunting, etc. The Garmin Nuvi is one of the Garmin GPS devices, which is used to download and install the latest Maps on your device. You can easily update Garmin GPS by using the Garmin Express Application. The Garmin Express is software that is used to update all the Garmin devices. The Garmin GPS device contains the detailed information of all mapped roads, streets, and highways, and latest updates maintain this information up-to-date.