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Accurate and Reliable Mirror Compasses The MC range of mirror compasses provides an invaluable tool for those who place a particular premium on accurate and reliable directional measurements; for example surveyors miners architects rescue patrols hikers boaters and the military. The declination adjustment system standard throughout the range is especially useful when working in areas of large magnetic variation while the sighting notch provides superior accuracy. The MC-2 model is also available with the Global Balancing System. Field compasses in general Mechanical compasses have been working as the navigator since several thousands of years. Still today magnetic compass is environmentally friendly cheap and the most reliable tool when choosing the course. The oldest Suunto field compasses which are still in use are manufactured in 1938. A high quality field compass hardly needs any other service than washing in fresh water from time to time. The compass works without any external power supply. The compass gets its power from nature – from the magnetic north pole.