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Simrad AP44, NAC-3


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So, weird problem.  Was fiddling around with the autopilot today as it is not working as planned.  Whatever I did, my problem is:

- say cruising along at 300 degM.  Plotter says 300, AP says 300.

- click Auto

- AP now says 276 and shows that my course is 20+ deg to Port

- still steers 300

 

Set to Heading Hold.

I have redone the Dockside setup and the Sea Trial, nothing has changed.  My steering offset is 0 deg.

 

Any ideas?  My original problem is more related to the hydraulics I believe.  Today I was seeing if I could hold the wheel as the Hydraulic pump was running.  I could do so in one direction and not the other.

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I spent the longest time figuring out why my fancy names 2k compass was 20 degrees off then realised that when I did the spinning around then take off in a straight line calibration it was calibrating for true north but the instruments were interpreting as magnetic. Changed my gps and displays to true and it was fixed. I could have omitted the straight line part of calibration and it would have calibrated to magnetic.

 

Hope that all makes sense. Garmin compass.

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If you can hold the helm one way not the other, the ram has a leaking seal (leaks oil from one side to other, nothing comes out).

 

Yes, try a factory reset on the AP and instruments, incl MFD.

 

There is no heading/compass offset in any instrument? Could be  a network "source" issue, not getting heading direct from the compass. A reset should correct any anomaly. 

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So, this morning I said righto, lets give this the bullet to the back of the head and do a global reset.  Just before I push the button, let's try the test again and.... no problem.  WTF?  Multiple reboots yesterday, but maybe it just needed a little rest overnight.  F'in electronics.

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If you are having intermittent issues , the most common problem is dodgy power on the n2k bus. Then termination, only 2 terminators at the end of the bus. Most of the mfds have a network diag screen, check for errors.

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