This plotter is made from Lexan, an extremely durable bullet-proof plastic (it won't melt if you leave it in the sun). It measures about 13-1/4" long.
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The American-style navigation plotter/protractor
is standard issue for lower latitudes where the meridians of
longitude are more parallel to each other. In northern latitudes,
where the meridians slope toward each other, these plotters become
more difficult to use due to visual illusions (it's harder to line
the plotter up with the pie-shaped meridians). Everything has its
place! In northern latitudes (for example, in Canada or
Scandinavia), aviators tend to prefer the parallel-rule plotter (the "Douglas protractor") for
measuring tracks because of the visible pie-shaped convergence of
the meridians toward the north pole.
This plotter is made from Lexan, an extremely durable bullet-proof plastic (it won't melt if you leave it in the sun). It measures about 13-1/4" long. |