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 TM 55-1905-223-10
Table 2-1. Description of Operator's Controls and Indicators - CONT
Key
Control or Indicator
Function
Gyro Compass Mark 27 Mod 1 Electronic Control Panel (FIGURE 2-8)
1
Caged Button
Pushbutton cages gyro compass.
2
Viewing Window
Allows gyrocompass heading check.
3
Level Meter
Indicates tilt of gyroscope spin axis; 2
minutes per division.
4
FOLLOW-UP
Illuminated, the gyro compass would lose one axis
ALARM
of freedome and could no longer be considered a
gyroscope.
5
POWER
Indicates power available to circuits (red).
6
DIMMER
Controls illumination level of compass card on
master compass.
7
SELECTOR
SLEW position energizes all circuits except
gyroscope motor and repeaters; in START position,
gyroscope is brought up to speed; in RUN
position, TILT/AZIMUTH switch is not energized;
in MANUAL LEVEL position, TILT/AZIMUTH switch
is energized; in AUTO LEVEL position, gyroscope
is brought to approximate level position. OFF
position turns system off.
8
8 AMP
Fuse protects internal power supply.
9
TILT/AZIMUTH
Controls gyro compass direction of rotation and
supplies tilt signal.
10
1 AMP
Fuse protects 120 volt ac circuit.
11
1 AMP
Fuse protects repeater internal power supply.
12
RPTR
Switch applies power to repeaters.
13
LATITUDE
Compensates for ship's latitude.
14
N-S
Set for north or south latitude depending upon
ship's location.
15
CAGED
Indicates gyroscope is caged (red).
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