Master-crafted by the machinists and minds at Brunton's world headquarters and tested in the mountains and mesas that surround us, the BRUNTON O.S.S. series compass is precision navigation, simplified. By moving the hinge for the sighting mirror to the center of the base plate, you're now able to sight objects faster and more accurately along the same direction of travel mark used for map navigation. Brunton has also added a meridian insert, so that you still have Brunton's patented tool-free declination system, but the meridian lines remain down on the map for greater ease and more precise headings. Dimensions: 2.9" x 3.9" x 0.8". Weight: 2.2 oz. Manufacturer's limited lifetime warranty. Made in the USA.