P.S. Incorrect resistors connected to P14 and P15 can also cause the symptoms, but you would have seen the problem in your calibration, which we already know is good. If the shunt jumper is fitting loosely, I could see it taking you through calibration. Between then and when you resumed the next day, it could have shifted and lost electrical contact. That would explain the fact that you had a good calibration one day, but no navigation control the next.
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