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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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HQRP GPS Antenna for Garmin GPSMAP 176, 176C, 178C Sounder, 180, 182, 182C, 185 Sounder - Walmart.com
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