Delorme called several of their receivers "Earthmates" and the first of
those use a Rockwell protocol rather than the NEMA standard protocol.
In addition, while their Tripmates used NEMA, they required a special
initialization string from the software to wake it up... something they
may have also used in the Earthma.
Very few gps apps (if any) were compatible with the Rockwell protocol...
posting some make model numbers would help.
Check the specs at
http://Delorme.com
Beverly Howard [MS MVP-Mobile Devices]