QLandkarte GT is the ultimate outdoor aficionado's tool. It supports GPS maps in GeoTiff format as well as Garmin's img vector map format. Additional it is the PC side front end to QLandkarte M, a moving map application for mobile devices.
QGis Python Plugin to create named map themes to switch the visibility of all layers belonging to theme. Experimental working prototype with functionality to include in future version of QGIS.