• NO - COM message and parameters REQ, RES, & MPG are missing., Communications are received by EDM and the Auto-Protocol setup is in process. Verify correct output format setup in GPS receiver; check GPS connections.

• NO - SIG message and parameters REQ, RES, & MPG are missing., GPS receiver has insufficient signal for valid data.

• NO - WPT message and parameters REQ & RES, are missing., No waypoints are programmed into the aircraft GPS receiver.

• - - - REQ  or - - - RES message, Your ground track is more than ?70° from your course to the next GPS waypoint.