Firstly, you need to use a GPS program to download the GPS files on your computer. I suggest you use EasyGPS, because it is compatible will all major GPS models: Garmin, eTrex, Colorado, Dakota, GPSMAP, Edge, Montana, Oregon, Rino. Once you transfer the maps on your PC using the EasyGPS program, click the Print button () to print your files. For further information, press the F1 key to open the user guide.