Suunto A-30 NH USGS Compass White One Size NSN 6605-01-549-4770. A 10 A20 A30 & A40 Compasses by Suunto Brand are great for any environment. A compasses are light weight and fit into the palm of your hand. Suunto A range Compass includes detachable snap lock lanyard luminous marking and bezel ring. These compasses comes with two zone system fixed declination correction scale and jewel bearing. Suunto A-20 Compass is a user friendly compact and highly accurate compass manufactured from robust material ideal for recreational and sports use. Suunto A-30 Compass is a compact high-accuracy compass for hiking and orienteering the luminous bezel and markings make it ideal for navigating in poor visibility. Suunto A40 Compass is a compact and durable high-accuracy compass with luminous bezel and markings. The integrated curvimeter together with centimeter inch and conversion scales make it ideal for the demanding navigator. The A-Range of recreational compasses is a series of handy well designed navigational aids which are assets in any environment. All four models in the series (A-10 A-20 A-30L and A-40) are compact high-accuracy instruments made from durable clear scratch resistant acrylic that have been ergonomically designed to fit into the palm of your hand for optimum ease of use. These light-weight compasses by Suunto feature a fixed declination correction scale as well as a patent-pending lanyard snap-lock enabling the compass to be easily detached from the lanyard. In addition to the Suunto A10 A20 A30 A40 Compasses 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 training and fitness needs. For more brand name Compasses please visit our Compasses page. 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. Specifications for Suunto A-30 NH USGS Compasses: Manufacturer: Suunto Color: White Fabric/Material: High Grade Steel Weight: 1.1 oz Length: 114 mm Width: 10 mm Height: 57 mm Luminous Points: Yes Compass Type: Baseplate Features of Suunto A-30 NH USGS Compasses Operable in low light with luminescent markings Magnifying lense on transparent baseplate for easy use with map Package Contents: Suunto A-30 NH USGS Compasses Quick Guide Warranty Suunto SS012100013: A-30 NH USGS Compass White One Size NSN 6605-01-549-4770