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ConPus External GPS Antenna BNC Male for Garmin StreetPilot III, GPS V III+ Sounder GPSMap 178C 188 276C 298c 398c 498c… – BLINKEE.COM
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Appendix a wiring and interfacing, Connecting the power/data cable, Interfacing | Garmin GPSMAP 178C Sounder User Manual | Page 106 / 134
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