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.
|
The American-style navigation plotter/protractor
is standard issue for lower latitudes where the meridians of
longitude are more parallel to each other. This is a deluxe
rotating-azimuth plotter made of Lexan, which is a very durable,
heat resistant, bullet-proof, clear plastic. 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 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. |