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    Re: SOA vs SMG or SOG
    From: Richard M Pisko
    Date: 2009 Oct 28, 11:06 -0600

    On Tue, 27 Oct 2009 15:35:52 -0600, QMCM  wrote:
    > It was in thanks for using
    > several of my articals and introducing The Franklin Piloting, The
    > Graduated perpendiclar bisector, for the three point problem (Sextant)
    I read your message #9304, but did not see any of the diagrams.  My only
    Bowditch is 1995.
    I'm interested in resecting my position from three points, mostly from the
    plane table.  I hadn't seen any instrument that would make it easier,
    other than a three arm protractor or purpose drawn intersecting angle
    chart overlays.  Protractors are getting a bit expensive.  Is a picture of
    your bisector available, with instructions?
    Trial and error in making the triangle smaller on a plane table map is
    pretty quick, if you understand the direction and amount each line will
    move when rotating the table for a new round of sights.  Two rounds
    usually gives a very good position, +/- 2 or 3 hundredths of an inch on
    the map; depending on the "goodness" of the angles to the reference points.
    Richard . . .
    Using Opera 9.2.4 after the "Dog" died
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