To transfer waypoints to your PC use Mapsource.
1. Connect your GPS to your PC with the USB cable and turn the GPS ON then depending on your GPS model, choose Mass Storage mode.
2. Launch Mapsource and choose Transfer Menu > Receive from device
3. In the Receive From Device window that opens, check Waypoints only and click Receive
4. Your Waypoints should now be listed under the Waypoints tab.
5. Save the waypoints to your PC.
