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 TM 55-1905-220-14-11
5-117. SHIP'S COURSE INDICATOR - MAINTENANCE INSTRUCTIONS.
a. General.
(1) The ship's course indicator is a servo-driven remote repeater that indicates the ship's heading. The indicator
receives heading data from the ship's gyrocompass. The indicator also receives reference power from the ship's supply.
The gyrocompass signals and reference power actuate the indicator to position-graduated dials that show the ship's
heading.
(2) The ship's course indicator is designated a Mark 2, Mod 6 and is a 400-cps two-speed single dial type. There
are two synchro's geared together in a 36:1 ratio (1X and 36X). The 1X synchro provides coarse control of the dial and
the 36X synchro provides fine control.
(3) The configuration of the servo gear train is shown below:
b. Principles of Operation.
(1) Ship's Course Indicators (SCI) are basically compass repeaters. They receive electrical three-wire synchro
data from a gyrocompass, and convert the data to a compass-card display. The 1X-36X complex indicator contains a
servo system that is described herein.
(a) Basic servo systems in ship's course indicators.
1
A SCI receives a two-speed synchro signal of the ship's
heading from a master gyrocompass. This signal is
impressed on the stators of a control transformer.
5-1306
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