I use one of the old GARMIN GPSMAP76 units and it still works after 8 years of pure abuse and to many dunks in the salt to list. You can hook it up to a PC and back up your waypoints and such as well as load charts into it. They have a newer GPSMAP76S I believe that is color with cards that you plug in for maps. They run about $200-400 dpending on which features you get, but it is money well spent. And they are SCARY accurate with the WAAS enabled, and still pretty good even in battery saver mode.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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