August 3, 2008 14:31
My GPS feed comes from a BU-353 on one USB port and data goes out to the autopilot via a Miniplex on the other USB port. The faulty data and no data alarms mainly come during the very slow screen redraws. The sudden course swings tend to come out of the blue, with everything appearing to be working normally. I'm about to leave on another trip and I'll try to capture some NMEA data when this happens.
Edmund