Agreed. these ships are full of electronic sensors... but the tech installed the AIS transponder what did he use for heading? the ship gyro or one of the dozen gps receivers installed. This was not well defined and sloppy. Nobody asked questions..you just wanted to be compliant. They were not initially thrilled about being constantly tracked. Ideally always use the GYRO.. dont complicate life using GPS heading. If the gyro is out the ship is anchored most likely.