B1W blocking my cars sat nav GPS signal

I don't recall anyone else mentioning this problem so I'd be more inclined to think you just got a bad one, it happens to any brand from time to time
 
I have 3 GPS antennas in the top corned of my windscreen that have not been affected by the B1W on my mirror stalk, i also often run a APP on my phone that also use its GPS and that too have not bee compromised by the B1W ( phone in Left side of dashboard )
But it is a fact that people can get into problems with dashcams ( a range of models and brands ) at least when it come to DAB radio signals.
 
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