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 TM 55-1905-223-10
NOTE
The compass card will move away from heading rapidly if a longer period than that
indicated in the following steps is allowed between starting and uncaging. If
possible, uncage when the hip is at the center of pitch or roll, so that the gyro will
be released near a level position.
(4) Position the SELECTOR switch (4) to START. Wait 30 to 35 seconds, then depress CAGED
BUTTON (1), located on top of the binnacle, and note that the CAGED lamp (9) extinguishes.
(5) Note if the pointer on the LEVEL METER (2) swings equally about zero. If it does, proceed to the
next step. If it does not, operate the TILT/AZIMUTH switch (5), in the direction of the required tilt
correction, until equal travel about the zero point is obtained.
(6) Observe the compass card for about 1 minute to determine the direction of card movement with
respect to the required course.
(a) If the card is moving toward the heading, allow it to continue until it is within 2 degrees of the
desired heading, then operate the TILT/AZIMUTH switch (5) to level the gyro and make the
average position of the LEVEL METER (2) pointer zero.
(b) If the card is moving away from heading, reverse polarity of the average pointer position by
operating the TILT/AZIMUTH switch (5). Wait until the direction of card heading, operate the
TILT/AZIMUTH switch (5) to level the gyro and make the average position of the LEVEL
METER (2) pointer zero.
(7) Position SELECTOR switch (4) to RUN.
(8) Position N-S switch (8) to N (north) or S (south) as required.
(9) Position LATITUDE control (7) to ship's latitude.
NOTE
If step repeaters are used, they must be synchronized to the compass card before
positioning REPEATER switch (6) to ON.
(10) Wait 10 minutes after uncaging and position RPTR switch (6) to ON if repeaters are used.
(11) Adjust DIMMER control (3), as required.
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