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On 2/10/2024 7:06 AM, NavList Community wrote:
> Plotting two lat/lon points (calculated by
> calculator) and drawing a line between them is IMHO much easier than
> plotting a point, measuring an angle, drawing and measuring a line and
> then drawing a second line at right angles. This is a variation on the
> time sight method except that the result is a position line rather than
> a longitude that is dependant on an (in)accurate latitude. Also not
> having to calcuate azimuth eliminates the NSEW to 360 degree confusion.

It's not necessary to calculate azimuth and draw a line toward the body.
You can work directly with azimuth angle Z and omit the azimuth line.
Begin by orienting the edge of the protractor east - west. Suppose the
body is west of the meridian and you're in the northern hemisphere. Turn
protractor counterclockwise by the azimuth angle. Move it to the assumed
position, then shift it toward or away according to your calculated
intercept. Now draw the LOP.

This is simple with a square protractor, though it may not be possible
with other drawing instruments.

--
Paul Hirose
sofajpl.com

   

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