- Thumb compass
A Thumb compass is a type of
compass commonly used inorienteering , 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 amap 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 Gear Junkie," a syndicated newspaper columnist in the United States, has an in-depth review of thumb compasses. [ [http://thegearjunkie.com/the-thumb-compass The Gear Junkie, September 2005, "Gear Review: The Thumb Compass"] ]
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 raceorienteering .Notes
ee also
*
Protractor compass External links
* [http://www.silva.se/templates/Products____106.aspx?epslanguage=EN&productId={68EECE64-791D-4D80-A3D1-1D17D0670FF6} Silva 6 Jet Spectra] , a typical modern thumb compass
* [http://www.compassmuseum.com/ The Internet Compass Museum] gives comprehensive information about all sorts of compasses and how to use them.
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