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post #1 of 8 Old 10-16-2007 Thread Starter
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Adjusting a Danforth Constellation Compass

I'd like to fine tune the adjustment on my compass and then swing it. The PO kept good records but the documentation for the compass wasn't one of them. Anyone still have their instructions? I see four compensating screws around the base, but thought I'd find out what they do before the trial and error routine I usually find myself in.

Ray
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post #2 of 8 Old 04-05-2011
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Same Problem

I see this is an old post... Did you ever find a solution to this? I have the same compass that needs calibration and am not sure the proper procedure with the four adjustment screws...

Thanks..
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post #3 of 8 Old 04-05-2011
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I found this:How to Adjust a Marine Compass | eHow.com

Not exactly on point but the general procedure might work. I've had difficulty finding exact information on this too.
A message to Danforth or whomever might work too.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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post #4 of 8 Old 04-05-2011 Thread Starter
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Thanks Ron,

I haven't monkeyed with the compensating screws yet. It's a strange arrangement though. The four screws are attached to rods that all connect to a small metalic block right under the compass. I'm not sure buts the four screws could actually be two rods that pull the metalic block a little bit out of alignment one way or the other. I should just pull the compass off, turn the screws and see how they influence the metalic block, but haven't done it yet.

I haven't tried emailing Danforth yet.

Ray
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1983 Fraser 41
La Conner, WA


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post #5 of 8 Old 04-05-2011
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erps don't play with the adjuster screws unless you know what you are doing. go to Chapman's Piloting and it will tell you how to swing a compass
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post #6 of 8 Old 04-05-2011 Thread Starter
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erps don't play with the adjuster screws unless you know what you are doing.
That's probably good advice Mike, but it goes against my nature.

I've had some experience swinging a compass in previous boats, but I had instructions on those particular compasses for compensating it.

Still, I may just leave it alone and make up a new deviation card, as I've installed a chart plotter on the pedestal guard and I haven't evaluated whether it had an impact on the compass yet.

Ray
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1983 Fraser 41
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post #7 of 8 Old 04-05-2011
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Thanks very much for the info
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post #8 of 8 Old 04-05-2011
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I also found this link..

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

A bit cerebral
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