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HQRP GPS Antenna for Garmin GPSMAP 521, 521s, 526, 526s, 531, 531s, 536, 536s, 541, 541s, 545S, 546, 546s, 550S, 555S, 720, 720s Navigator + HQRP Sun Meter : Amazon.ca: Electronics
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Garmin gpsmap 521s and 421s fish finder mode | Garmin | marine fish finder | marine echo sounder - YouTube
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