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Captain Peter Freudenberg from Bradenton Boat Rental gives a tutorial on the Garmin 541S GPS - YouTube
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Garmin GNX 21 - Additional LCD display for navigator - for GPSMAP 40XX, 421, 42XX, 441, 50XX, 52X, 52XX, 53X, 546/546, 54X, 720, 7215, 74X, 8212 - Walmart.com
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