The most popular compass in general use today. The back of the base plate has a new contoured ergonomic design that fits your hand. Graduation lines and large numerals allow easy reading. The Polaris with Wheel has the same basic features of the regular Polaris with the addition of a map measuring wheel. Simply trace the wheel along your intended route, compare distance to map scales and you have your distance. The sculptured Ergo-Grip removable sleeve offers user comfort and compass protection, even on the toughest trail.