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    Re: Position lines, crossing
    From: Bill B
    Date: 2006 Dec 12, 01:20 -0500

    Lu wrote:
    > The atmosphere, refraction, and even the
    > conductivity of the earth (influenced by things such as moisture
    > content) affects the speed of radio waves.  Loran designers could
    > compensate for some of this with calculations, but effects caused by
    > things such as ground moisture required experimental measurement.
    > Without knowing these systematic errors, Loran had great repeatability
    > (coming back to an exact set of Loran coordinates would typically bring
    > one to within � 50 feet of the position where they were originally
    > measured) but initially poor absolute accuracy (L/Lo as calculated by
    > the box and/or from TD LOPs plotted on charts) (typically 1/4 mile or
    > more). 
    If I recall older texts, Loran radio waves could also be subject a change in
    direction/speed by to bouncing off bluffs, cliffs, and other land obstacles.
    Is that fact?
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