The Silva Expedition 4 Mil Compass is a "full-size" base plate compass for experienced navigators, and is used by different defence forces around the world.
Baseplate compass w/magnifier ? Inch and mm map measuring scales ? Romer scales: 1:25k, 1:50k, 1:63.36k ? Luminous points for navigation in the dark ? Graduated in 4000(military) Mils