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    Re: astrocompass still in use
    From: JC Sutherland
    Date: 2002 Sep 27, 22:27 +0100

    Quoting Robert Eno :
    > Interesting application.
    > How on earth did you manage to keep your astrocompass perfectly level
    > whilst
    > it was mounted on your boat?
    > Robert
    > > Hi.
    Yes, levelling is a problem but as it happened it was quite a calm day and we
    were in an enclosed harbour. Each mesurement was done several times (under
    engine with no sails up) and I chose the best steadiest moment for each
    observation. A particular difficulty was that on a couple of headings the sun
    was obscured by the mast. These readings were extrapolated from the others and
    I had to recheck them next day. It was satisfying that they came out as
    Another useful trick was to calculate the magnetic co-efficients from the data
    (the program is quite simple) and then to synthesize the deviation curve from
    these. This results in a smooth curve to best fit the data.
    > > > Clive Sutherland.
    > > Wantage, (where King Alfred burnt the cakes).
    > > 51deg 38.2 min N 001deg 24.5min W

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