TM 5-6675-250-20
1-9. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
GYROSCOPIC REFERENCE UNIT(GRU)(1) . . . . . . . . . . .
THEODOLITE (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRIPOD ASSEMBLY (3) . . . . . . . . . . . . . . . . . . . . . . . .
Pendulous north seeking gyro, which automatically
references the readout theodolite to true north.
Surveying instrument used to measure vertical and
horizontal angles.
Supports and provides leveling for the GRU.
1-4
