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Gary LaPook wrote:
> But before you can lay down the LOP you first have to lay out the intercept. 
So you can set the plotter so that you count degrees from a parallel to plot 
the azimuth and then mark off the intercept along this azimuth line then 
place the plotter on the azimuth line so that it is perpendicular at the 
intercept and draw the LOP.

With the right tools you don't really need to do all that. The LOP can
be plotted directly. I use a square protractor and a graduated
straightedge, though the general idea should be adaptable to other
drawing instruments.

Place the square protractor on a meridian and orient it to the Z of the
body. Move the protractor to put one of its sides (one of the two which
lie parallel with the eventual LOP) on the assumed position, without
disturbing the orientation of the protractor. (This is easily
accomplished by sliding it along the straightedge.) After placing one
edge on the AP, slide the protractor toward or away from the body the
appropriate distance, again using the straightedge to maintain
orientation. Draw the LOP.

Although my protractor is transparent and has a grid with 5 mm squares,
I find this grid useless for applying the intercept (or anything else).
Instead, I use the mm scale on the straightedge. And since the
protractor is only 5 inches on a side, I usually use the straightedge to
draw the LOP.

The square protractor I own has been in the Celestaire catalog for many
years. I have only used the 5 inch model. It is accurate and robust, and
seems the right size for close quarters. However, I think it would be
more useful with millimeter scales on all sides and the compass rose on
the inside.

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