Thumb compass

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Thumb compass on left

A thumb compass is a type of compass commonly used in orienteering, a sport in which map reading and terrain association are paramount. In cases of homogeneous terrain with few distinct features, a bearing between 2 known points on the map may be used. Consequently, most thumb compasses have minimal or no degree markings at all, and are normally used only to take bearings directly from a map, and to orient a map to magnetic north. Thumb compasses are also often transparent so that an orienteer can hold a map in the hand with the compass and see the map through the compass.

Thumb compasses attach to one's thumb using a small elastic band.

The first commercially successful orienteering thumb compass was the Norcompass, introduced by Suunto in 1983.[1]

Placing an even greater emphasis on speed over accuracy, the wrist compass lacks even a baseplate, consisting solely of a needle capsule strapped to the carpometacarpal joint at the base of the thumb; the thumb serves the function of a baseplate when taking and sighting bearings. It is often used for city and park race orienteering.

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  1. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2011-07-24. Retrieved 2009-04-03.CS1 maint: Archived copy as title (link)