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Silva Expedition Compass

Silva Expedition features easy-handling Dryflexâ„¢ housing, silicon rubber feet for precision map work, detachable safety-release lanyards, night-enabling luminous markings, magnifying lens, map-measuring scales in mm or inches, 1:25000, 1:50000 and GPS scales, plus built-in adjusters for magnetic declination (including permanent local adjustment) ... the Expedition can also map-measure 1:40000