A thumb compass is a type of compass commonly used in orienteering, a sport in which map reading and terrain association are paramount. Consequently, most thumb compasses have minimal or no degree markings at all, and are normally used only to orient the 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.
The first commercially successful orienteering thumb compass was the Norcompass, introduced by Suunto in 1983.
"The Gear Junkie," a syndicated newspaper columnist in the United States, has an in-depth review of thumb compasses.
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.
 See also
- Silva 6 Jet Spectra, a typical modern thumb compass
- The Internet Compass Museum gives comprehensive information about all sorts of compasses and how to use them.
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