MapSource products provide geographic data in CD-ROM/DVD-ROM format that can be viewed on a PC. Additionally, some Garmin® units can accept map downloads from various MapSource products to augment the detail already on your Garmin GPS basemap.All MapSource products include the trip and waypoint manager functions for transferring waypoints, routes, and tracks. Your preference for map detail and your specific activities will determine which MapSource product is right for you. MapSource gives you the flexibility to select the mapping coverage you need.While using MapSource, the trip and waypoint planning function is compatible with nearly all Garmin GPS systems. The map transfer feature is compatible with numerous Garmin GPS units—please check your specific Garmin GPS unit and MapSource product for compatibility.