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    From: Barry Hudson
    Date: 1999 Jun 23, 18:13 EDT

    >Date: Wed, 23 Jun 1999 09:12:43 -0700
    >To: Navnet
    >From: bhudson <bhudson@XXX.XXX>
    >Subject: LOP's
    >All LOP's of a celestial nature need an arrow at each end. This is
    >perhaps not so important with say a single sun observation but when
    >it comes down to a multi star/planet set of observations (as many as
    >six or maybe more) you need to distinguish the azimuth lines from
    >the Position lines by placing the arrows.What a clutter we have if we
    >dont do this. Electronically of course only the PL's appear on the LCD so
    >it does'nt matter about the arrows. Someone already mentioned that
    >the celestial PL is an arc of a circle and harking back to coastal nav
    >when taking a sextant or radar distance off it is part of a circle of
    >position so we put an arrow at each end of that arc of the circle we
    >are most likely to be on. In coastal navigation we also have other
    >arrow symbols to identify lines on the chart and prevent confusion e.g.
    >is it a course line, bearing, tide or current drift,and so on. It is
    >also important to bear in mind how many people are involved in the
    >navigation of the vessel.For instance take a large commercial vessel
    >with many users of the same chart one has to be particular with symbols
    >used they must be readily understandable to all. In the case of a
    >single navigator then he can do what he wants as long as the PL's make
    >sense to him.
    >Myself if I did'nt use arrows to distinguish between azimuth and PL
    >confusion would rain supreme.
    >This is a most stimulating network.
    >Barrie Hudson

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