Patent ID: 6701631
Filing Date: 2004-03-09
Classification: G01C,Y10S

Abstract:
A modular compass adapted for magnetic and non-magnetic measurements, the compass comprising a body, the body having an upper surface, a lower surface and an aperture extending through the body, an angle reference plate hinged to the body, a dip angle bezel communicating with the angle reference plate, an interchangeable laser module and magnetic compass module removably affixed to the aperture, a lock communicating with the aperture, an outer retaining ring disposed about the aperture, a rotatable calibrated azimuth ring disposed between the outer retaining ring and either the laser module or the magnetic compass module, the laser module and the magnetic compass module adapted to rotate within the aperture, at least one bubble level disposed in the body, and at least one pivotable mirror adjacent to the bubble level.