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Discussion Starter · #1 ·
I have a nexus autopilot. The PO had a messy Nexus/Raymarine set up.

It seems a new fault has developed which is strange. Underway, the nexus systems (reading from the compass I assume) read about 0-5 degrees off the Raymarine GPS fed reading. Normal I assume, compasses never read the same :)

The issue is, the moment I engage the autopilot on a bearing, the nexus-shown bearing jumps 20 degrees starboard and the autopilot lurches to the left.

Currently, the autopilot is useless......

Any ideas? Nexus support was no real help.
 

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Discussion Starter · #5 ·
Thanks for the ideas.

The compass isn't especially near anything. Its a new problem, it was working a few days ago.

The next part in the saga however is that now the Nexus displays are not showia bearing of any kind. They are just blank.
 

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Discussion Starter · #7 ·
Sorry to resurrect this old thread.

I got a new nexus HPC compass, and things seemed to go well on our trip south, thousands of miles. Now, we are heading home, and our sailing is almost all downwind.

It's an Autonav, the AP 1500 that uses an original Nexus display unit.

I am struggling to get it to function. I have tried to incrementally adjust the calibration settings, but no matter what I do, the autopilot will hunt back and forth ever increasing until we are turned so far off the wind, we get overpowered. The problem is exacerbated in following seas when swell will turn our rear around.

Our boat is a 1974 Tartan 41, which isn't great downwind, but still...

Does anyone have an original nexus and can recommend some starting calibration numbers and then a good adjustment method. I can't seem to get the four setting right ><
 
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