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Autopilot Oscillates Back and Forth

Old 07-07-2014, 09:47 AM
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Default Autopilot Oscillates Back and Forth

The last time I tried my older Raymarine autopilot it would not hold a course. Instead it would swing the boat to port then starboard repeatedly. It was kind of un-nerving actually and I had to turn it off pretty quickly. Tried it several times.


It used to work fine, but recently a tech outfit tried to interface it with my new Simrad chartplotter. That was not successful that I can tell but it is still connected.



Anyone know what might cause this kind of behavior? Could it be that I need to disconnect it from the Simrad? I'm just not that savy with these units as this is the first autopilot I've had.


Any suggestions welcome.
Old 07-07-2014, 01:42 PM
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Dumb question, but what is your Gain set at? And is there a speed input setting? If your gain is really low, it will make adjustments very slow, which will cause sway.
Old 07-07-2014, 02:36 PM
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You should be able to adjust that out.
My Simrad AP24 would do that too.

Check your Raymarine manual.
Old 07-07-2014, 03:20 PM
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It just sounds like the operator settings are set wrong. Something like gain, response, rudder, counter rudder, weather, etc. How you adjust it back to the proper settings depends on what particular model you have. If you had a tech onboard, they may have reset the settings to try to get it working with the plotter and not put them back to what they were before.
Old 07-07-2014, 04:47 PM
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Thanks guys, that is helpful info. I've never had an autopilot before and so far have not done anything more than just turn it on and off while underway.


Its about a 2004 vintage, and I was able to download the manual online, so I'll check out the available settings.
Old 07-07-2014, 06:25 PM
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Have you gone through the setup/configuration procedure?
Autopilots need to be calibrated to be accurate, also.

Instructions on initial calibration are in your manual.
Old 07-08-2014, 09:06 PM
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Please list the course computer model number and the control head part number.

One is the box down below that everything plugs into the other is the 5x5 box with the buttons
Old 07-09-2014, 04:11 PM
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I'll bet its an ST5000. They were know for making course corrections on their own.
Old 07-10-2014, 09:51 PM
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The tech guy called me. He is going to do a sea trial to figure it out.. More later......
Old 07-07-2015, 11:02 AM
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For what its worth, I just ran the boat over from Marathon to Goodland - 90 miles - and used the auto pilot most of the way. I don't have an explanation but It worked perfectly.
Old 07-08-2015, 05:26 PM
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Sinuous course for torpedo evasion?

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