Some early models could reset gps location by driving in two tight counter clockwise circles then two clockwise circles. Honestly I've never needed to do this and don't think it will help if no sat's are present. Did your last command have a similar problem?
I'll try circles today, I tried an aftermarket antenna made by timble or trimble, I attached it to the roof but it did not worked. Maybe I did not give it enough time.
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