The CP7 tubular compass is used with Sokkia total stations and theodolites and is attached to a slot in the instrument carrying handle. The CP7 compass allows setting the instrument to the local magnetic north direction. The compass tube contains a needle, needle pivot and a clamping screw. A properly balanced free needle lies horizontally aligned in the magnetic field. A pointer on the south end of the needle is viewed through a window and aligned between two index lines.