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Title: Wild swings on Nav—not NMEA related!
#5
"Autopilot only" is indeed checked in the GPS panel. The multiplexer is a Shipmodul 41USB and you would know far better than me how much data can be held in the buffer. Do you know of some way of purging the multiplexer buffer as a test?

The autopilot is a ComNav 1001, which is an exceedingly common model in this region. Oddly, I don't know of anyone else who has rigged a computer to a 1001 to use the nav function so I don't know if it could be something inherent in the autopilot.

It's quite sloppy here today, but as soon as I can get back out I'm going to experiment with a single waypoint vs route. Both cases use the nav function but I can't recall ever seeing a problem going to a single waypoint. I can also kill the only piece of electronics that could conceivably cause a feedback loop.
Edmund
 
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