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SOG= Speed over ground or the speed on your GPS.


STW= Speed through water or the speed indicated by your speedometer and or your down probe. Both are different speeds. 


All three are very different speeds. The most important speed is the one at the ball given by your down probe. When discussing speeds you should always indicate the source so someone can help you. I have been travelling 3.7mph at the surface, 2.7mph at the ball and 1.5 mph over ground due to wind and currents.

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