Maps purchased in DVD format will require a computer to use but they will allow you to plan trips on your computer and transfer waypoints, routes and tracks to your GPS device. The installation process will install the mapping and the MapSource or BaseCamp application to your computer. MapSource or BaseCamp can then be used to send maps to either your device or a blank datacard. Please note that most mapping products in this format are unlocked to a single device and they are non-transferable.