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 TM 55-1905-219-14-7
3-216. HEADING SELECTOR - MAINTENANCE INSTRUCTIONS.
The Heading Selector is used as an interface between a gyrocompass and steering control panel to select the
desired heading of they vessel. The gyrocompass transmits actual heading data to the Heading Selector for comparing
the actual heading data with the ordered heading data. If the actual heading and the ordered heading are the same,
there is no signal output from the Heading Selector. If the actual heading and the ordered heading differ, the Heading
Selector will produce a signal that will cause the rudder positioning equipment to change the vessel's actual heading to its
ordered heading.
Three-wire synchro data from the gyrocompass provides the heading information, and the same 115-volt, 400-
hertz supply that powers the gyrocompass is needed for reference and illumination requirements. The gyrocompass card
is connected to a synchro which is excited by a 115-volt, 400-hertz supply.
Three-wire heading data is transmitted by this synchro to synchro B1 of the Heading Selector. The heading
selector card is connected to synchro B1 rotor so that for any reading of the gyrocompass card, the voltage induced in
synchro B1 rotor will be zero when the heading selector card is set to the same heading. When the heading selector card
and the gyrocompass card are on different headings, an error voltage is induced in synchro B2 rotor.
3-3315
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