For Professional Pilots this is a square protractor for professional pilots with aeronautical symbol cut-outs of a square, circle and triangle
For Professional Pilots, This i128mm square protractor has a 0-360 scale on the outside edge with reverse 360-0 scale adjacent. Location letters N.E., S.E., S.W., and N.W on corners.
With aeronautical symbol cut-outs of a square, circle and triangle. Centre drilled for location and gridded in squares of 13mm(4nm). Supplied in a self-sealing clear plastic case. Standard commercial school issue.
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