The ideal mapping compass, TruArc? 5 base plate models have additional map grid lines for quick orientation and a magnifier for easy reading. TruArc? Global Needle system means you don't have to buy a new compass when you make that trek to South America or Australia, and tool-less declination adjustment will keep you on course anywhere in the world. Overall dimensions: 2.9" x 4.2" x 0.6" (7.4 x 10.6 x 1.5cm). Wt.1.8 ounces (51 grams). TruArcTM Global Needle; 2 degree resolution; Map magnifier; Inch/CM scales.