Back up waypoints, routes and tracks that you have saved on your Garmin GPS to your PC using the Trip & Waypoint Manager software. Do not forget to use Trip & Waypoint Manager to archive GPS data for future use. Home & Hobby software downloads - Garmin MapSource by Garmin Ltd or its subsidiaries and many more programs are available for instant and free download. Garmin Mapsource is not develloped anymore, but version 6.16.3 runs still pretty well and has no big bugs. The most popular is still Garmin Mapsource - even though it is superseeded by Garmin Basecamp and also Qlandkarte GT is on the way to overtake it. Simply plan your next trip on a PC, download GPS data to your Garmin unit, and go. Download garmin mapsource 64 bit for free. There are several programs to display openmtbmaps on your PC/notebook. Simplify pre-trip planning for your next outdoor adventure or business trip by using MapSource Trip & Waypoint Manager to transfer waypoints, routes and tracks between your Garmin GPS and PC. Use JavaWa Device Manager to make the maps on your unit viewable in BC.
Now you have two choices: Use the software I linked to before to copy your maps from PC 1 to PC 2 (what I'd do).
Designed for use with Garmin units that have no built-in map detail Since your maps were transferred to the unit from MapSource they're not 'officially' viewable in BaseCamp.