Silva Polaris Model 177w

Just like its counterpart, the Polaris Model 177W has all the same features plus a Map Distance Wheel measuring system.

Features:

• Patented system allows you to plot any curving trail distance from a map.
• Exactly eight inches in circumference
• Lets you take a continuous measurement of the length of any trail up to eight map inches long.
• Space-saving system gives you quick and accurate distance measuring when used with the map legend.
• The Map Distance Wheel is made in the U.S.A.