TM 5-6675-250-10
2-1. OPERATOR'S CONTROLS AND INDICATORS - Continued
(2) Caging knob (2). The CAGE-UNCAGE
knob on the upper housing of the
GRU is used to uncage the pendulum
in the bias mode and after the gyro
motor attains synchronous speed in
the GC (gyrocompass) mode. Also,
the caging knob is used for caging
the pendulum after bias and after the
GC has been completed. Illumination
of the GYRO SYNC indicator on the
ECU is necessary prior to activating
the CAGE-UNCAGE knob when in the
GC mode.
(3) Vertical lock (3). The vertical lock on
the theodolite permits the operator to
lock the telescope at any desired ver-
tical position. When the vertical lock
is released (turned counterclockwise)
the telescope is free to be moved to
any vertical position.
(4) Elevation control (4). The elevation
control permits the operator to con-
trol the vertical positioning of the
telescope. The control is used to cen-
ter the target image vertically in the
reticle pattern of the telescope.
2-2
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