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Old 18-04-2015, 03:58   #1
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Auto pilot issue

Hi all

Tried to use the autopilot on our new to is boat today but have an issue. It's a course master cm800. When I hit the pilot button to engage the pilot it turns heavily (about half to 3/4 of a turn) to starboard. It then over shoots heavily the correct heading. That problem I think I can get rid if through the menus etc but why would it instantly deviate when I engage the pilot? It is a 25 tonne ketch so steerage is not very reactive but that shouldn't influence the course when the autopilot gets engaged. Any suggestions appreciated


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Old 18-04-2015, 06:15   #2
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Re: Auto pilot issue

Are you steering to a waypoint or a compass heading when this occurs? If to a waypoint, then it is attempting to zero out the cross track error before resuming course.

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Old 18-04-2015, 06:31   #3
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Re: Auto pilot issue

Had that happen. If its a hydraulic system, check for air in the lines. That was our issue


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Old 18-04-2015, 07:11   #4
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Re: Auto pilot issue

I had a tech put a waypoint into the computer 600NM from out position at the dock. He was testing something and left it activated. He left after doing his work. Finally I figured it out because I kept seeing DTW 99.99 NM to next WPT. Sounds like it would be simple to discover, but my B&G's don't register above 99.99. Also on another occasion, the rudder reference bar was bent when servicing the packing on the shaft. You might look at that too.
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Old 18-04-2015, 15:02   #5
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Re: Auto pilot issue

Thanks guys. I was steering to compass. There is no nmea set up on this one as when I hit the nav button it just sits there thinking. The air in the lines makes the most sense so far as when I bought it it was low on hydraulic fluid so I will try that and see how I go. Now to figure out how to bleed it
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Old 19-04-2015, 00:25   #6
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Auto pilot issue

Me again! So I did more reading up on bleeding these etc but I just went out to the boat to see what brand etc everything is and going by everything I have read this system should really bleed itself. See the below pic is the pump which is located higher than everything else. By turning full lock to full lock which I have done many times without it engaged should bleed it automatically? I stand to be corrected!


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Old 19-04-2015, 00:27   #7
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Re: Auto pilot issue

With pic Click image for larger version

Name:	ImageUploadedByCruisers Sailing Forum1429424788.378852.jpg
Views:	89
Size:	122.0 KB
ID:	100639. You can see where the fluid level was when I first got it and made me thought air would have surely got in


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Old 19-04-2015, 05:28   #8
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Re: Auto pilot issue

The way I can test mine is to put the hydraulic valve in the autopilot position (usually a lever by the helm) and then try to turn the wheel. If the air is all out of the system, the wheel should not move more than a fraction of an inch (excepting play in the cables, etc). If it turns more, that is an indication of air in the system that is being compressed allowing the wheel to turn.


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Old 19-04-2015, 05:41   #9
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Re: Auto pilot issue

Quote:
Originally Posted by Paperbird View Post
The way I can test mine is to put the hydraulic valve in the autopilot position (usually a lever by the helm) and then try to turn the wheel. If the air is all out of the system, the wheel should not move more than a fraction of an inch (excepting play in the cables, etc). If it turns more, that is an indication of air in the system that is being compressed allowing the wheel to turn.


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Excellent I will try that. Also just found how to bleed it easily so will do that next weekend and also clear any heading that it may have from previous waypoints if it is capable.
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Old 28-04-2015, 21:54   #10
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Re: Auto pilot issue

So the plot has thickened a bit. There appears to be no air in the lines. Upon closer examination after our last sail when I hit the pilot button to lock on the course the wheel brings itself back to centre and then starts steering back to its course! Once back on the course it appears to hold it very well. Now the question is what programming do I need to do to correct this???? Seems very ofd


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Old 29-04-2015, 02:39   #11
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Re: Auto pilot issue

Try a cold start and set up from scratch.
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Old 29-04-2015, 02:40   #12
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Re: Auto pilot issue

Yeah I guess that is the next step.


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