Description of GDMTools SDK - GPS-Bibliothek (German) :
The most outstanding feature is the high modularity of the components that enable integration of GPS-receivers into own software products. Most commmon receivers (NMEA, Garmin, Trimble) are supported out-of-the-box but you can easily extend the library with own modules for exotic receivers.The functions:- Realtime receive actual position and other informations- Coordinate transformations- Up- and download of waypoints, routes and track logs- Visual controls for many of the informations