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Old 16-07-2011, 13:23   #1
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Deviation (Too Much) on Compass

Would anyone know where (and how) to look for reasons to very large deviation on my Marco Polo compass - still originally mounted on the steering column - no extras to interfere (as I know)?

I have Raymarine instrumentation - 2 feet away - batteries below deck. Any suggestions are welcome.

Kind regards

FLPPLFFLP
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Old 16-07-2011, 14:02   #2
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Re: Deviation (too much) on compass

what is the hull of the boat made out of
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Old 16-07-2011, 16:16   #3
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Re: Deviation (too much) on compass

Greetings and welcome aboard the CF, FLPPLFFL.
How does one properly pronounce that name?
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Old 16-07-2011, 23:31   #4
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Re: Deviation (too much) on compass

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what is the hull of the boat made out of
Thank you for your question. The hull is made of fiberglas, its a Kirie Feeling 1350.
Regards FLPPLFFLP
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Old 16-07-2011, 23:34   #5
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Re: Deviation (too much) on compass

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Greetings and welcome aboard the CF, FLPPLFFL.
How does one properly pronounce that name?
Thanks for your warm velcome.
Regards FLPPLFFLP
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Old 17-07-2011, 00:51   #6
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Re: Deviation (Too Much) on Compass

How much deviation are we talking about and how much has it changed since you got your boat?
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Old 17-07-2011, 09:25   #7
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Re: Deviation (Too Much) on Compass

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How much deviation are we talking about and how much has it changed since you got your boat?
Hello Astrid.

Well - depends on - If I use the compass compensation i one heading (fx. west) - then its awful north or south, resulting in deviation of 20-25 degrees. I of course have other navigation equipment (GPS and chartplotter) and a fluxgate compass - but it's anoying to have that kind of failure.

This deviation came last year - and I am positive, that no changes have been made - at least that I can think of.

Do you have any ideas?

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Old 17-07-2011, 09:41   #8
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Re: Deviation (Too Much) on Compass

are there magnets in it and if there are have you checked to see if they have moved???? been looking for photos you the compass but come up with many different types
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Old 17-07-2011, 09:45   #9
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Re: Deviation (Too Much) on Compass

"Well - depends on - If I use the compass compensation i one heading (fx. west) - then its awful north or south, resulting in deviation of 20-25 degrees."

What compass compensation is that - the magnets? Something you are changing with heading?

Michael
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Old 17-07-2011, 10:08   #10
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Re: Deviation (Too Much) on Compass

Hello captain

Thanks for all your efforts. About the magnets -in fact I don't know. The compass are built in a console, which I havn't managed to dissasemble. It's a Goiot steering console, and the stainless bolts are stuck in the aluminium.

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Old 17-07-2011, 10:11   #11
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Re: Deviation (Too Much) on Compass

Hello Michael

Please se my former answer to captainKJ about the magnets. What I mean with one heading is: If I compensate the compass to show the rigth heading in west it's out of alignment in other directions.

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Old 17-07-2011, 10:19   #12
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Re: Deviation (Too Much) on Compass

there are different magnets for east-west and north-south,,BOTH SET have to be alined correctly,,,, some go fore and aft the other go right and left,,,you can hire someone to do this for you but expensive,,,

http://www.irbs.com/bowditch/pdf/chapt06.pdf

might be best just to do a compass deviation card and go from there
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Old 17-07-2011, 10:21   #13
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Re: Deviation (Too Much) on Compass

if youc an post a photo of your compass and MORE info on the type,,,there are MANY marco polo compass out there also the age if possible,,,years the boat was built might help a little
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Old 17-07-2011, 10:30   #14
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Re: Deviation (Too Much) on Compass

where are your cockpit mounted stereo speakers located?
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Old 17-07-2011, 10:33   #15
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Re: Deviation (Too Much) on Compass

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where are your cockpit mounted stereo speakers located?
I wonder if it is singing along with the music,,,,tooo many filling in the teeth might have an effect on the compass,,,,might want to just listen and not sing along to the music
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