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> From: "Royer, Doug" 
> They are made of clear plastic,are about 18 - 22 inches long on each
> arm.The
> arms are connected to and pivoted on a protractor or rose.One finds
> terrestrial points,lays one leg over each point and ones position is
> somewhere around the pivot.

Just trying to think this through, they seem to work like a technique I
do know. You take a sheet of clear plastic and on it plot the 3 angles
or bearings to a common point. Then fit that over the chart so the
lines intersect the 3 features and the point is the fix.

Still grappling with the 'circular LOP'. How do you know where to
describe the circle? The distance off is usually what you are trying to
establish.

   

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