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The Garmin EchoMap Ultra 2 Series chart-plotter display is packed with features for freshwater & nearshore boating anglers. Learn about them here. ... Still, it’s possible to add an external GPS ...
But active antennas amplify the signal to get past the loss in the extra wiring; with a little bit of hacking, you can add an external active gps antenna to just about any GPS unit. Find out how ...
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