If the firmware of your device supports the .GPX format for track records in the 'Select Data to Log / Engineering Mode: Logging Control' then this track may be loaded in MapSource without any conversion.
If the device supports only .BIN format for recording a track then this gps.bin file must be converted to .GPX format using the current version of [Only registered and activated users can see links. ] and then it may be uploaded into MapSource.
P.S. Files with the real tracks are stored in a hidden directory .System/Logs/...