[GPSNavX]

Or for a Garmin Colorado or Oregon (300 or 400 or 550) GPS receiver you could use these two cables ..

http://www.tripplite.com/EN/products/mod...delID=3914

https://buy.garmin.com/shop/shop.do?pID=1169

Then be sure to set the Garmin GPS receiver Setup->Interface to NMEA IN/NMEA Out

In GPSNavX GPS panel Settings drawer select the port KeySerial1, Rate 4800, Type Garmin

Seems to me this would be more affordable then Windows, A new Nav application or a new GPS receiver.

The Garmin Oregon does support NMEA spanner mode, but this requires the Windows spanner software be used. What it does it take the Garmin proprietary data and fabricate NMEA sentences to a virtual Windows com port.

If Garmin were to develop the spanner software for Mac then one could use the Garmin USB cable and GPSNavX or many other Mac titles that rely on NMEA data.