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I had a similar problem. I found that the fault was in the wind instrument transducer (a shorted cable?). when I disconnected it from Seatalk, the chartplotter receives the GPS signal. Reconnect it and I lose the GPS fix on the plotter. Try disconnecting other instruments from Seatalk and see if this solves the problem. So now I can either know where the wind is or where I am but not both.
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