Hello, I am using a furuno GP 7000 for my navigation, which is paired with a GPA017. Last time out, I had a GPS no fix, and was never able to get the gps to get signal. Connection in back of unit, I did a full reset on the unit, diagnostics showed no issues and tested the external antenna, which ohmed out at 270 ohms. Wondering what I might do to continue troubleshooting.