Used by GPSMAP® 276C, GPSMAP® 278, GPSMAP® 296, GPSMAP® 376C, GPSMAP® 378, GPSMAP® 396, GPSMAP® 478, GPSMAP® 495, GPSMAP® 496
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4 black ground
5 white alarm
7 brown voice (+)
8 yellow data in 1
1 orange voice (-)
2 blue data out 1
3 green data in 2
6 red power
9 violet data out 2

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9 pin Garmin GPSMAP proprietary of Garmin GPSMAP power and data cable connector layout
9 pin Garmin GPSMAP proprietary connector
at the GPSMAP unit
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