Precision, easy to use. Tri-scale makes plotting quick & easy. 1/20-inch & millimeter rules for mapping. Silicone feet for map gripping. Easy to read. Large sighting mirror with vee notch. Geared declination allows adjustment for difference in degrees between magnetic north & true north. Faster reading with less chance of error. Easy-grip bezel with white numbers on black dial. Luminous points for dim light. Includes lanyard, adjustable slider and screwdriver.