The Explorer Pro by Silva is a needle compass designed to fit ergonomically in your hand. The Explorer Pro has and extended base plate with features that help orienteering. Use a Explorer Pro Compass as a valuable tool on any expedition for safe navigating and excellent sighting. The Explorer Pro has an clinometer for measuring tilt or elevation. The declination scale on the Explorer pro Compass makes adjustments for map bearing to field heading a quick task. 1:24,000 and 1:62,500 direct reading scales enable accurate sighting and plotting. On the extended base, inch and 1/10-mile direct reading scales meet U.S.G.S standards for measurement.