TM 55-1905-223-24-14
FIGURE 1-17. Magnetic Compass.
(2) Do Not Service Alone. Under no circumstances should any soldier work on energized equipment alone,
except in the presence of another soldier who is c4pable of rendering aid and assistance.
(3) Resuscitation. Soldiers working with or near energized equipment should be familiar with modern
methods of resuscitation.
Section III. PRINCIPLES OF OPERATION
Overview of Gyro and Magnetic Compass Systems
The Principles of Operation section will tell you basic information about how these two compass systems work.
1-8. Gyro Compass.
a. Power Distribution. Gyro compass system (Sheet 1, FIGURE 2-18) power (FIGURE 1-18) is supplied from
120 Vac, single phase, 60 Hz input from the pilothouse IC/ELEX (interior communications/electronics) panel to the power
converter (Sheet 2). The power converter converts the 120 Vac input to 24 Vdc. This normal operating power of 24 Vdc
is supplied to the power transfer unit. The power converter also supplies 120 Vac to the gyro control and power assembly.
The power transfer unit transfers the gyro compass equipment from the normal 24 Vdc input power to the emergency 24
Vdc supply in the event of normal supply failure.
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