It was possible up to MapSource version 6.5 to show GPS position in MapSource.
After that Garmin moved the functionality to nRoute instead. It's only reading GPS data from a Garmin GPS with Garmin protocol. With NMEA 0183 GPS data you need to transform that with Franson GPS Gate.
MapSource Change History
Changes made from version 6.5 to 6.7:
* Removed real-time tracking from MapSource. Use nRoute for PC real-time tracking applications.
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I have a Holux GPSlim236 that works perfectly with GMPC. It works with all Bluetooth or serial GPS that provides a standard NMEA 0183 data stream.
Just use the JetMouse KG to generate 25-char code for "SW.UNL" file. Otherwise GMPC will only work with Garmin GPS protocol.