Not in my experience, just make sure nothing besides tha hatch is above it to block the signal. It is a good idea to place the GPS on the CG so that the boat's trim is not effected.
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Don't put any metal over the antenna as this give a false reading. The clearer the view of the sky the better. Take the gps for a run in your car & compare speeds & distance. This will tell your if it is out or not.
Yeah, I did that in 2 different vehicles and it appears to be right on as well as matching those roadside radar speed things. It was only a one time thing. Just trying to cover all the bases. Thanks
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