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I would trust the GPS over the truck speedo. Off the production line your truck could be off 10% at higher speeds (hence the 7 mph over the speed limit rule). I have a GPS speedo on the boat and it is always exactly the same as the chartplotter speed. The transducer wheel speed is always going to be off at low speeds due to the current. You could hold your position in some current and the wheel would tell you the speed of the water going by you.
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