Figure 4-20.--Mk 19 Mod 3A gyrocompass equipment.

follow-up errors. The system (fig. 4-20) consists of four

phantom, which measures the angles from the

major components: the master compass, the control

horizontal. The compass element is gimballed in the

cabinet, the compass failure annunciator, and the

binnacle to allow 60 of freedom about the roll axis

standby power supply.

and 40 of freedom about the pitch axis.

SUPPORTING ELEMENT.-- The supporting

Master Compass Assembly

element includes the frame and the binnacle. The

compass elements are gimballed in the binnacle by a

The master compass assembly (fig. 4-21) is

conventional gimballing system with 62 of freedom

approximately 3 feet high and weighs about 685 pounds.

about the roll axis mechanically, 60 electrically; and

Its two major components are the compass element and

42 of freedom about the pitch axis mechanically, 40

the supporting element.

electrically.

COMPASS ELEMENT.-- The compass element

The meridian and slave gyros are similar in

includes the sensitive element (meridian and slave

construction, with the exception that the slave gyro is

gyros), the gimbal, and the phantom assembly. The

inverted and minor changes in wiring are made. The two

phantom assembly includes the azimuth phantom,

which indicates the meridian, and the roll and pitch

gyro assemblies are mounted on the inner ring of the

Figure 4-20.--Mk 19 Mod 3A gyrocompass equipment.