Deviation card /table? - SailNet Community
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View Poll Results: Do you have a deviation card /table on board?
Yes, created it myself 15 20.83%
Yes, created by a compass compensator 4 5.56%
Yes, created by someone else 3 4.17%
No deviation card /table 32 44.44%
What is a deviation card /table? 18 25.00%
Voters: 72. You may not vote on this poll

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post #1 of 27 Old 01-26-2009 Thread Starter
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Deviation card /table?

How many of you have a deviation card / table on your boat? I have sailed about 40 different boats. Four had deviation cards / tables. Yes, many of them had deviates on board too. ( I had to get that in first)

Jack

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post #2 of 27 Old 01-26-2009
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In a binder with all sorts of documentation that came with the boat, I found an almost-totally-faded deviation card. I can't read some of the values. I've never sailed anywhere that I couldn't see where I was going, so even though we use the compass, we don't depend on it. When I wasn't sure, the GPS told me... some day I'll get around to making my own deviation card.

Also don't compasses usually have weak internal magnets that are placed to cancel out the deviation?
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post #3 of 27 Old 01-26-2009 Thread Starter
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Quote:
Originally Posted by AdamLein View Post
Also don't compasses usually have weak internal magnets that are placed to cancel out the deviation?
The adjustment magnets can account for SOME deviation. After a compass compensator removes as much deviation as possible, they can then create the card.

Jack

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post #4 of 27 Old 01-27-2009
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We had the compasses done and cards made on the last boat, haven't done the new boat yet, but will in near future. The compass is so much easier to use to steer a course when it's rough than a chartplotter.

John
SV Laurie Anne

1988 Brewer 40 Pilothouse

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post #5 of 27 Old 01-27-2009
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Flying we always had one. In a plane it's easy. You go to a runway that has special marks on the pavement in the shape of a circle. You taxi the plane into the circle at different angles and look at the compass, noting the needed corrections.

I ought to make one for our boat. Maybe the travel lift guy will shift around to 8 points of the compass and hold still, so I can get some accuracy? Probably not.

Good idea.
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post #6 of 27 Old 01-27-2009
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Holy Crap!!!!!!!!!!!!

I am amazed at the number of folks plying the waters without a properly calibrated compass and a deviation card!!!!

I have mine professionally calibrated every two seasons or any time I make an electronics change near my compass. Read the article in the link below and please find a professional to swing your compass!!!!!!!

I can guarantee that many of your compasses are off... way off!!!!!!!!!! Get them calibrated please!

Charlie is my compass guy and it's some of the best money I spend.

Charlie Cook / Maine Compss Services (LINK)

I guess we've become a point & click sailing forum.. Compass what's that???

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Last edited by Maine Sail; 01-27-2009 at 12:45 PM.
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post #7 of 27 Old 01-27-2009
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You sure wouldn't want a compass deviation card made while on a travel lift, unless someone had a plastic or timber travellift.
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post #8 of 27 Old 01-28-2009
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Maine, I appreciate the need for a proper deviation card in lots of situations, but I also suspect there are many sailors who are almost never in such situations. Day sailors in inland waters who never go out when there's a potential for fog, and carry a GPS... they've (we've) pretty much got it covered.

If I were to plan an extended trip I would certainly calibrate the compass first. I might do it anyway... just for the practice.
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post #9 of 27 Old 01-28-2009
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Quote:
I am amazed at the number of folks plying the waters without a properly calibrated compass and a deviation card!!!!

I have mine professionally calibrated every two seasons or any time I make an electronics change near my compass

Do you find that the deviation card changes much between your two season checks?

Ray
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1983 Fraser 41
La Conner, WA


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Boating for over 25 years, some of them successfully.

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post #10 of 27 Old 01-28-2009
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Quote:
Originally Posted by tweitz View Post
You sure wouldn't want a compass deviation card made while on a travel lift, unless someone had a plastic or timber travellift.
Yes, it was a bit tongue in cheek. It would be a funny picture though.
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