Figure 46. Forty-ton cathead mounted on bow of ship.
h. Gyrocompass instruction. The Navy gyrocompass school teaches:
(1) Basic principles of the action and operation of the gyrocompass.
(2) Cause of gyrocompass errors and how to correct or compensate them.
(3) Maintenance and care of the compass and its equipment.
i. Convoy communication. The Navy convoy communication school teaches the various types of signaling used between ships in a convoy. The instruction includes:
(1) Naval signal codes and calls.
(2) Procedure signs.
j. Machine-shop training. The machine-shop training includes the operation of drill presses, grinders, lathes, cutters, punch and shear machines, shapers, forging hammers, and milling machines. The men work with different types of metals, receive practical experience in various kinds of machine-shop jobs, and learn how to maintain the equipment and tools.