J.P. Instruments EDM 930 Primary Pilots Guide - Manual (Page 60)

For Your Safe Flight Page 55
GPS Interface Diagnostics
Measurements ‘xxx REQ’,
‘xxx RES’ and ‘xxx MPG’ are all
missing from the scan.
No communications from GPS receiver
to EDM. Possibly no connection or
aircraft GPS is off.
NO - COM message and
‘xxx REQ’, ‘xxx RES’ and
‘xxx MPG’ are all missing from the
scan.
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
‘xxx REQ’, ‘xxx RES’ and
‘xxx MPG’ are all missing from the
scan.
GPS receiver has insufficient signal for
valid data.
NO - WPT message and
‘xxx REQ’, ‘xxx RES’ are all
missing from the scan.
No waypoints are programmed into the
aircraft GPS receiver.
Message ‘- - - REQ’ or ‘- - - RES’
appears .
Your ground track is too many degrees
(typically more than
70°) off from your
course to the next GPS waypoint.