GPSMAP 172C, external antenna
, wired to DC box on Catalina
27. The system is below deck
and has never been exposed to water
I power it up, it turns on, searches and finds satellites, and then when it loads the Data Card, it will completely shut down. When I power up again, it will repeat the same process.
Any ideas - Amp fuse, grounding, chart card, internal problem...?
Thanks for any ideas.