PP-3 Round Protractor
Round 110mm diameter protractor with 0-360 scale on outside edge. Centre drilled for location and gridded in squares each of 3 nm 1:500,000 with centre horizontal 1:500,000 scale.
Round 110mm diameter protractor with 0-360 scale on outside edge. Centre drilled for location and gridded in squares each of 3 nm 1:500,000 with centre horizontal 1:500,000 scale.