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 Flying School Issue...

Convenient short length for cockpit use. Outside edges respectively read to 60 Nautical Miles in 1:500,000 and to 30 Nautical Miles in 1:250,000. Centre scale reads Statute and Kilometers in 1:500,000 scale . All Scales and Protractors are manufactured to withstand perpetual use. Each supplied in polythene slip case ...