Nautical Brass Sundial Compass top is movable, and a curving scale is used to determine your latitude angle. The sundial may be pointed north using the magnetic compass. When being transported, the compass has a needle lift mechanism to preserve the jeweled bearing. This is very effective and economical to use. Nautical Brass Sundial Compass is used to align the sundial to the proper latitude angle, while the compass is used to determine true north based on the magnetic north declination of the location. It is very safe to use and loved by all.