KM-1 (14 inches)
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.
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.