Jake, 
I hope you find a better place for the sensor and your system works better. 
Let us know if it does or doesn't? It may help others. 

I have a friend with an older Raymarine autopilot and he claims his makes a 90 
degree turn off of Margate, similar to yours. 
I have never witnessed the problem because we rarely use the autopilot when we 
are together. Mine doesn't do that. 


Chuck 
Resolute 
1990 C&C 34R 
Atlantic City, NJ 
----- Original Message -----
From: "Jake Brodersen" <captain_j...@cox.net> 
To: cnc-list@cnc-list.com 
Sent: Tuesday, March 26, 2013 9:52:11 PM 
Subject: Re: Stus-List Autopilots 




Chuck, 



I can try moving the sensor. I think it has plenty of wire still attached to 
it. The current position easily meets #3 and 4 below. 1 and 2 only matter if 
pitch, roll, and yaw become an issue. Motoring in flat calm conditions 
shouldn’t bring these into play. Oh well, one more thing to try this summer. 



Jake 





From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Chuck S 
Sent: Tuesday, March 26, 2013 6:20 PM 
To: cnc-list@cnc-list.com 
Subject: Re: Stus-List Autopilots 




Hi Jake, 
Just checked the Raymarine ST4000plus manual on Stu's website under service 
manuals and see they reccommend: 

Fluxgate sensor: 
1) to minimize gimbal distrurbances be positioned as near as possible to the 
pitch and roll center of the boat. 
2) positioned between .3 to .5 length of boat from aft 
3) at least 2.5 ft from navigating compass 
4) as far away from the engine as possible, within the above parameters. 

It sounds like your sensor may be too far aft and/or maybe too low, allowing 
the engine to break the snsor's ability to sense the earth's magnetic field? 
Can't promise anything but your system may work better if you move the fluxgate 
sensor? 


Chuck 
Resolute 
1990 C&C 34R 
Atlantic City, NJ 
----- Original Message -----


From: "Jake Brodersen" < captain_j...@cox.net > 
To: cnc-list@cnc-list.com 
Sent: Monday, March 25, 2013 9:06:51 PM 
Subject: Re: Stus-List Autopilots 




Chuck, 



I located the fluxgate in the aft portion of the quarterberth. There aren’t any 
other wires running close to it. Far enough from the engine and control panel 
too. It doesn’t malfunction often, but when it does you need to be there to 
correct it. 



Jake 





From: CnC-List [ mailto:cnc-list-boun...@cnc-list.com ] On Behalf Of Chuck S 
Sent: Sunday, March 24, 2013 10:43 PM 
To: coltrek; cnc-list@cnc-list.com 
Subject: Re: Stus-List Autopilots 




I would suspect the fluxgate compass may be located in a bad place on the boat 
where it is affected by something metallic. Or maybe the wiring is experiencing 
a surge from a power source? Besides many hours of sailing and motoring a 
narrow ICW channel, I made at least seven 12 to 13 hour trips using our ST 
4000plus and never experienced that problem. Six hours from Atlantic City to 
Cape May and six hours Cape May to Greenwich, NJ. 


Chuck 
Resolute 
1990 C&C 34R 
Atlantic City, NJ 


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