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    Re: digital compass, etc
    From: Stephen Ellis
    Date: 2000 Sep 12, 8:49 AM

    ). 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{at}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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