NavList:

Gary,
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Thank you very much indeed for your kind remarks; you assume correctly. :-)
As for your clarification on AP longitude, you are completely right, of course.
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Speaking of dividers, I would add that with the T-Plotter one does not need them in order to plot an LOP. The grid with tics 1/20" apart is dense enough for human eyes to mark distance as accurately as is practically possible, especially considering the finite thickness/sharpness of a typical pencil.
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As the next linked image shows, the use of this device is not restricted to VP-OS plotting sheets on which 1 inch represents 20 nautical miles. The density of the grid allows for a very accurate and instantaneous translation of a distance marked along the latitude scale of any chart into the corresponding number of 1/20" tics on the T-Plotter.
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There are dry-erase markers available on the market (the one in the linked video I obtained via Amazon) with which one can mark on plastic using one end and erase with the other end. That way one can make temporary markings on the T-Plotter itself. This can be useful, for instance, in situations when the chart's scale is such that the intercept distance comes out longer than what the azimuth arm allows. In such a case one would have to "patch" that distance from several pieces and do some extra sliding and marking along the azimuth arm direction.
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Peter Hakel
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