FIELD: physics, navigation.
SUBSTANCE: invention relates to a method and an apparatus for maintaining geodetic direction relative to the true meridian. The solution is based on that two optical systems having reflecting surfaces are placed on independent planes having a common vertical axis of rotation and linked by an optical beam into a single unit. A retroreflector is placed on one of the planes to obtain and monitor the maintained geodetic direction. Implementation of the method and setup of the apparatus when maintaining or restoring the direction is provided by rotating the two planes about each other to enable the beam to pass from a laser mounted in one of the optical systems through a predetermined optical path.
EFFECT: solution enables to reproduce the geodetic direction in both stationary mounting conditions and mounting on a location with minimum effort.
5 cl, 18 dwg, 1 ex
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