Scale ruler, outside edges respectively read to 35 Nautical Miles in 1:250,000 and to 7 Nautical Miles in 1:50,000. Centre scale reads to 130 Kilometres in 1:50,000 scale and to 70 Nautical Miles in 1:500,000 scale.
Opaque white Perspex scale with square edges. Printed on both sides with 4 outside edges reading to 97 Nautical Miles in 1:500,000 scale to 194 Nautical Miles in 1:1,000,000.
Convenient length (255mm x 38mm) for cockpit use. Outside edges respectively read to 70 Nautical Miles in 1:500,000 and to 35 Nautical Miles in 1:250,000. Centre scale converts between Kilometres and Nautical Miles to 75 Nautical Miles.
Standard Flying School Issue. Outside edges respectively read to 110 Nautical Miles in 1:500,000 and to 55 Nautical Miles in 1:250,000. Centre scale converts between Kilometres and Nautical Miles to 120 nm.
Outside edges respectively read to 110 Nautical Miles in 1:500,000 and to 220 Nautical Miles in 1:1,000,000. Centre scale converts between Statute and Nautical Miles to 100 nm.
Standard flying school issue. 128mm square. 0-360 scale on out-side edge with reciprocal headings indicated adjacent. Location letters N.E., S.E., S.W., and N.W on corners. Centre drilled for location and gridded in squares of 13mm (4 nm). Supplied in self-sealing clear plastic case.
Standard commercial school issue. 128mm square. 0-360 scale on 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.