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Garmin True Wind - Not Registering Correctly

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I have a Garmin GNX (I think) from a generation maybe 4-5 years ago. Came with the boat. It reads boat speed, depth, and wind speed and direction. It has worked great so far. The issue this year is that true wind speed is either not registering, or is reading the same as boat speed. I want to go up the mast and check things out, but I can't find anything online about what to look for. 

The instrument up top spins (though not as easily in light wind as it used to. So my first theory was a bird got up there. But wind speed matching boat speed is weird to me, especially when its blowing 15kts.

Any advice on what to look for or what to fiddle with?

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