The A-40 is a compact, high-accuracy compass manufactured from durable, clear, scratch resistant plastic.The base plate is ergonomically shaped to fit comfortably in the hand. The A-40 has a fixed declination correction scale. The A-40 features a patent pending lanyard snap-lock, which enables the user to detach easily the compass from the lanyard
The A-40 also features an integrated curvimeter for measuring distances on geographical maps. Features include: long base plate with a magnifying lens, luminous bezel and markings, holes for control marking, Cm scales: 1:15 000, 1:25 000, 1:50 000, Conversion scales 1:10 000, 1:20 000, 1:100 000, & inch scales – 1:24 000 and 1:62 500.