Garmin GPSMAP 278 pinouts
The connector/pinout information may be applied to the Garmin (show all pinouts) model GPSMAP 278
Garmin GPSMAP power and data cable pinout Used by GPSMAP® 276C, GPSMAP® 278, GPSMAP® 296, GPSMAP® 376C, GPSMAP® 378, GPSMAP® 396, GPSMAP® 478, GPSMAP® 495, GPSMAP® 496