Since I didn't see the answer to TUNAs initial question. WAAS stands for wide area augmentation system. When GPS first came out it worked off of 4 satelites and was only accurate to about 500 feet on a GOOD day. Then they came out with GPS that used land based towers to increase the accuracy. WAAS came out later on and it allowed the units to read up to 12 satelites to get the accuracy down to 10 feet roughly.
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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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