Earthmate not compatible with Mappoint
Just so everyone knows and doesn't repeat the same error I made, the Earthmate USB receiver is not NMEA 2.0 Compliant, which means that it is incompatable with Mappoint. Which in turns mean it doesn't work with Coyote's Mediacar GPS setup.
I was lucky that I hadn't opened the Shrinkwrap on the included software with my earthmate I bought from Comp-USA otherwise they would not have allowed me to return it. I exchanged it for a NAVMAN (which was $10 anyways) and it works great!!!