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Post by fulmitz on May 23, 2015 23:49:29 GMT
Does anyone else have issues with the compasses in the cockpit? Both of mine are significantly off from each other by over 40 degrees. I was told this was due to the electric winches. If so wouldn't everyone have these issues? It's hard to believe there is no fix for this. Any help would be appreciated.
Thanks,
Rob
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Post by Trevor on May 24, 2015 1:46:29 GMT
Hi Rob, I don't have that problem on our boat but the compasses do have adjustments to offset permanent magnetic fields around the compass. I figure that 40 degrees may be too much for the adjustments available but reference to this article may help you at least establish that the magnetic field from the winches is out of the correction range. www.selfmadesailor.com/index.htm?diy-compassadjusting.htm&2Good luck with it. I think we all like to have an old faithful magnetic compass that is reasonably accurate at the helm and 40 degrees out is way too much. Regards, Trevor |
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Post by ianpowolny on May 24, 2015 6:55:47 GMT
Rob, depending on our heading our compasses can read up 20 degrees different but also exactly the same on another heading - we checked this against our handheld GPS. We did start making a deviation table but never finished it off. We also considered a Compass Swinger but that was going to be around £300. In the end we've done nothing about the compasses and just live with the problem. Mind you it could have become a bit of an issue in the middle of Biscay last year when all the electronics decide not to work but a simple roboot sort that. Ian
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Post by dilligaf on May 29, 2015 7:59:48 GMT
We had the same issue on our DS49 but resolved the issue by bringing on board an Electronics guy in San Diego and spun the compasses. Now all the compasses are true and also the chart plotter. We had quite a bit of differences between the two compasses at the steering heads and the GPS. I would consult as specialists to have them corrected. We did so just before setting across the Pacific. Good luck
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Post by fulmitz on Jun 1, 2015 2:53:20 GMT
It seems strange to me that Jeanneau would build a boat and include electric winches standard and put a compass next to it and not be aware that it would cause interference and throw the compass reading off. I just don't know who to call as they guy I use is blaming the winches and says there is nothing he can do to fix it. Is there a way I could "spin the compasses" myself? What's involved in that? Thanks,
Rob
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Post by tonyinman on Jun 2, 2015 5:42:59 GMT
Rob
I also have the 44DS and coincidentally just raised the exact same issue with the local JNO dealer here. Some headings compasses very close (but never same), but usually very very different. Ive noticed mine off by 30 degrees +/-. So far getting same story line blaming it on electric winches. That may be the case, I dont know. But if that is the case, that makes JNO look pretty foolish and incompetent in my eyes. I dont recall being advised that the compasses on their boat could not be relied on and would not actually indicate an acurate compass heading. Seems like a disclosure issue. It does not tell me in the owners manual that compasses are unreliable when mounted in proximity to electric winches.
I will be watching this thread for anything you learn. I'm just getting started on this here. I'll post anything I come up with.
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Post by dnickj on Jun 5, 2015 9:55:28 GMT
For my 2 cents worth I would thing the compasses are supplied out of the box and no adjustment is made to them on fitting
This is probably OKish with the manual winches fitted but put a motor with a big magnet in it close to the compass the adjustment get thrown out
I would also say the adjustment could also be altered by what you have stored in the adjacent locker
The only way to sort would be to get the compasses adjusted and a deviation card made either by employing a professional adjuster or a big learning curve and a lot of fiddling about DIY
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keithk
New Member
44 DS
Posts: 3
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Post by keithk on Jun 8, 2015 6:20:24 GMT
[object Object]
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Post by fulmitz on Jun 8, 2015 15:45:47 GMT
Keith,
Not sure what you were trying to post but it's not showing up.
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Post by boogie on Jul 27, 2015 18:26:18 GMT
DS 41 Compass deviation. Winches/steering gear. My compasses also point several 10 of degrees in different ways. Of course it goes crazy when using el.winches, but they are heavily influenced when turning the wheels. I expect the chain and steel rope beneath to be made out a too magnetic material. I put the compasses on a pedestal about 10 cm high, it possible helped some but the deviation is still to high for navigation purposes. I further find it impractical/impossible to make a dev.table accounting for both boat heading and wheel movements. I have more or less resigned, but may be us of a lead sheet or something similar could solve the problem.
Any comments or proposals?
best regards
Knut on S/Y "Boogie"
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Post by Maravilla on Apr 20, 2019 21:42:16 GMT
We also had the same issue. The dealer told us it was our stainless steel grill. We hired a professional to swing our compasses. They were so far off that the internal compensation couldn’t fully correct. I think this should be a warranty item (this is a required navigation item), but unless you require it prior to delivery the costs are yours!
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Post by Trevor on Apr 23, 2019 14:05:18 GMT
Hello maravilla,
If your stainless steel grill is made of 300 series material ( 304 or 316 stainless ) it would be hard to argue it causes a magnetic deviation of the compass as they are not magnetic materials.
Regards,
Trevor
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Post by zaphod on Apr 23, 2019 17:47:05 GMT
The compasses on my 39i are pretty much in agreement with each other, and the GPS, and flux gate compass on my instruments.
It seems to me that if power winches were causing the deviation you should see the same amount of deviation in the opposite direction from one side to the other.
Probably the only way to verify if it is something on your boat influencing their accuracy would be to remove them and test them away from any possible interferences. You could also use a hand bearing compass to test them. Theoretically things like power winches should influence a small hand compass the same way it influences your fixed compass. As you move your hand compass closer to different suspected sources of interference you should see similar deviation.
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Post by zoeimogen on Apr 23, 2019 17:57:50 GMT
Way off (40º) on our 30i too - we concluded it was probably the wheel pilot having tried removing various instruments. Either that or it was permanently magnetised when the original analogue wind vane display was next to it.
We don't bother with it any more - it stays with the cover on most of the time and we just use the fluxgate via one of the other instruments. If we had a total electrical failure, we could either use an iPhone, our hand bearing compass or dig out the deviation chart we made if desperate.
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Post by simk on Apr 24, 2019 12:20:08 GMT
Same issue here on 44DS. Both compasses were off by 30 deg. I simply adjusted both compasses as stated in manual. Compass has 2 magnets where you adjust N/S and W/E declination. You need to circle your boat and do the adjustment as you go. Little time consuming but at the end it works OK.
Hope this helps
Simon
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Post by Trevor on Apr 26, 2019 20:44:05 GMT
Great suggestion by zaphod to use a hand compass to check the influence of location on your boat and search for objects causing magnetic deviation.
Good idea.
Trevor
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