ATV trail maps from GPS Trailmasters will install to your Garmin GPS and overlay your existing base maps. Although this demo is for the Garmin Montana 600, our maps are compatible with almost all Garmin GPS devices. Your Garmin GPS provides the turn-by-turn routing software so that feature must be included with your GPS. Other consideration for the Garmin you choose is the screen size, battery life, ability to hard wire to your snowmobile, ATV, dirt bike or OHRV. The outdoor hand held units are typically ruggedized and waterproof. The automotive units are more susceptible to the elements but have larger screens and cost less money. The ATV trail map can be downloaded instantly to your GPS internal memory, your own SD card or it can be shipped to you already installed on an SD card. Trails are color-coded to identify what type of OHRV is allowed on the trail. Unique line styles are used to identify access roads - paved roads usually within city limits that are used for ATV access to gas, food, lodging, parking, etc. And of course, you can find hundreds of POIs on our maps for these services. Auto route with turn-by-turn directions to your destination. See your position on the map as you ride the trail. See your track behind you as you ride. Save your tracks for later use or submit to GPS Trailmasters to be added to the map. http://www.gpstrailmasters.com