Own excellent value & superior accuracy with the Silva Polaris 177. Large numerals at every 20° mark and a clear base plate with inch and millimeter markings and a 1:24,000 scale make it easy to read a map, set bearings and plan a trip with the Silva Polaris 177.
2° dial graduations
Declination scale for quick adjustments of map bearings to field headings
Inch & millimeter rulers
1:24,000 map scale