Suunto M-9NH Compass w/ Velcro Strap Black One Size NSN 6605-01-543-8145 6605-58-000-0975. The M9 Compass by Suunto Brand has a serrated bezel ring that allows for easy turning even while wearing gloves. M nine compass is available in black. Suunto compasses has two zone system as well as side-reading window. M 9 compass also includes a sighting hole and luminous card. The vertical intensity and direction of the earth's magnetic field the inclination influences the horizontal plane of a compass needle according to the latitude where it is used. Due to inclination compasses must be balanced for different geographical zones in order to keep the needle in a horizontal position. Previously the globe was divided into five different balance zones in which specific compasses functioned. However as people travel more and more the need for a compass with a greater geographical range has increased. Thanks to Suunto's 'Two Zone System' there are only two balance zones to consider in compass use - the northern hemisphere and the southern hemisphere. In practice this means that a Suunto compass designed for the northern hemisphere will still work for a fair distance into the southern hemisphere and vice-versa. Suunto also makes globally balanced compasses which can be used accurately all over the world. In addition to the Suunto m9 Navigation Compass we carry a full line of Suunto Compasses as well as other product offerings from Suunto Brand. We also carry a full line of Suunto Watches to help meet your fitness training and navigation needs. For more brand name Compasses please visit our compass page. Specifications for Suunto M-9NH Compasses w/ Velcro Strap: Manufacturer: Suunto Color: Black Fabric/Material: Plastic Weight: 1.1 oz Length: 1.9 1.9 in Width: 1.6 in Height: 0.6 in Size: 1.6 x 1.9 x 0.6 in Compass Type: Accessory Operating Temperature: -22 - 140 Fahrenheit Features of Suunto M-9NH Compasses w/ Velcro Strap Operable in low light with luminescent card Rugged construction Package Contents: Suunto M-9NH Compasses w/ Velcro Strap Quick Guide Lanyard Suunto SS004403001: M-9NH Compass w/ Velcro Strap Black One Size NSN 6605-01-543-8145 6605-58-000-0975