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). Patrick McVey wrote:
>>sensitivity varies due to large pieces of). The
>>sensitivity varies due to large pieces of...^metal in your vessel^(

>This is swung by turning the boat slowly thru 360 degrees.  I also have a
>autohelm 3000 autopilot this is swung in a similar manner.
>Except that in the autohelm it is necessary to then point the boat on a
>fixed bearing and remove any offset in the deviation.
Thanks for the help.  I don't have a boat.  I should have said that I
installed my digital compass in my CAR.
Thanks Patrick, and Aubrey.  When I calibrated my compass, I had to drive
around in a circle two times, stop, then two more times.  Sounds like they
do that in boats too, except in the autohelm you have to take that extra
step.  I didn't know that, I never heard of the Autohelm.
Stephen Ellis
-----Original Message-----
From  Aubrey O'Callaghan 
To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM

Date: Monday, September 11, 2000 6:20 PM
Subject: Re: digital compass, etc


>I've got a Furuno electronic compass on my boat (connected to the radar).
>This is swung by turning the boat slowly thru 360 degrees.  I also have a
>autohelm 3000 autopilot this is swung in a similar manner.
>Except that in the autohelm it is necessary to then point the boat on a
>fixed bearing and remove any offset in the deviation.
>This is not necessary with the Furuno compass. How can the Furuno "know"
>any offset ?
>
>Aubrey.
>
>At 08:39 AM 07-09-00 -0700, Patrick McVey wrote:
>>I don't mind though slightly off subject. You're doing what's called,
>>"swinging the compass." The sensor (fluxgate I believe) and microprocessor
>>are testing the sensitivity of all 360 degrees and making a correction
>>table for each point of the compass (probably all 360 points). The
>>sensitivity varies due to large pieces of

   

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