Orienteering type compass best for search and rescue work - acts as own protractor. Orienteering type compass components. Clear base plate with inch and millimeter scales on it. Direction of travel arrow and index line. Swiveling 360 degree dial with two degree increments and orienting lines.
Compass needle is in a fluid filled container and points towards magnetic north.
Sighting mirror for accurate azimuth determination. Can also signal an aircraft. Attach to belt loop or button hole in pocket with lanyard so compass is not lost. Good, durable compass important in field. Use of a compass.