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    Re: Fluxgate compass
    From: Richard B. Emerson
    Date: 2002 Jan 29, 1:37 PM

    "[...]my boat was fiberglass hulled so it was not too big of a problem[...]"
    Er, not always.  One With The Wind has fiberglass hull and deck / cabinhouse
    for her core construction and finding a place to locate the fluxgate for the
    Raytheon 6000 a/p was a challenge.  We finally put the fluxgate in a
    locker about even with the mast and along the port side of the hull but
    various fittings in the galley and coming from water tanks under the settees
    caused problems during calibration runs.   It took four tries to make things
    come out right but once we found a relatively safe spot, the figure of merit
    was well below the maximum allowed value.
    S/V One With The Wind, Baba 35
    Dan Allen writes:
     > On my boat the installer of the fluxgate compasses spent quite some
     > time looking for places in the boat which were as far away from
     > metal as possible in which to install them, but no extra compensating
     > magnets were used.  Of course my boat was fiberglass hulled so it
     > was not too big of a problem...
     > Dan
     > -----Original Message-----
     > I took Craig's question differently, however:  Before even starting to
     > develop a deviation table for a compass, a good compass adjustor first
     > tries to minimize the compass's deviation though use of the compensating
     > magnets within the compass and even external devices such as quadrential
     > balls and Flinders sticks (the latter two are used mostly on steel vessels
     > since, as one might imagine, it's quite difficult to get a compass to read
     > correctly when surrounded by a big lump of iron).  Is this sort of
     > compensation also done for fluxgate compasses?  Is it the same as or
     > different from the way it is done for traditional compasses?

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