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Tidal Fish Super Subscriber - I rock!
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Which is more accurate? My GPS or my Garmin fishfinder. I recently installed a new fishfinder with transom mount speed wheel and have noticed a 10 mph difference. Any opinions out there?
 

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GPS is more accurate for speed over ground. Does the delta reading change at different speeds? Are you sure the GPS is set to MPH versus KPH?
 

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Go into setting and make the correction in setup:
Setup/Calibration tab/calibrate speed and follow the directions
 

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Bob is right - your GPS is measuring the speed over the ground, while your depth finder is measuring the speed of the water pushing the paddle wheel. You could theoretically be anchored in a 10 mph current, and your depth finder would show that you were moving 10 mph because of the current flowing past the paddle wheel - while your GPS would indicate 0 mph because you are anchored and not moving over ground.
 
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