I believe D-RATS has an excellent built in mapping capability that is specifically designed to be used without a network connection.? There is a utility program, d-rats_mapdownloader.exe, located in the same directory as the executable for D-RATS itself, that will download map tiles for a selected geographic area.? Once downloaded D-RATS will use the cached tiles.? I am not a real wizard at all this, but did manage to download maps for the local area here and create overlays for points of interest such as trailheads.? The maps are basic street maps, not topographic maps.? Perhaps a real expert could tell us how to get topo maps loaded.
73,? Richard Browning? AD5RB