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 TM 55-1905-220-14-1
1-85. NAVIGATION SYSTEMS.
a. The Mark 27 Gyro Compass at the helm contains a gyroscope. It is controlled to seek true North using properties
of the gyroscope along with rotation of the Earth and the effect of gravity. The Mark 27 is different from other gyro
compasses because the gimbal system used reduces the complexity of the equipment.
b. The Type B, Mark 2, Mod. 2 ship's Course Indicator is mounted on a pelorus stand and gimbal round. It is
located at the conning station atop the Deckhouse.
c. The Remote Magnetic Heading System consists of an induction compass transmitter, a heading indicator and
connecting wiring. The Transmitter is mounted on the top of the mast and detects the relative bearing of the Earth's
magnetic field. This signal is fed to the heading indicator for a visual display. The indicator is mounted on the helm
console in the Pilot House. Power for the system is taken form the 24 volt DC Panel P-24.
1-86. COMMUNICATION SYSTEMS.
a. The vessel uses communications systems located in the Pilot House. They are Transceiver AN/URC-46, Radio
Set AN/URC-80, Receiver R-442, Marine VHF Transceiver DSC 500, and hand-held Portable Radios EDH/EPI.
b. The ship contains Identification Friend or Foe (IFF) equipment. The equipment consists of control C-6280/APX-
72, Receiver/Transmitter RT-859/APX-72, Mounting Assembly DL-SC-B691474, and Antenna AS-177A/UPX.
Preparation is made for future installation of voice security kit, 1 A/T SEC. Power input is form the distribution panel in
the Pilot House. IFF equipment is installed in the Pilot HOuse's electronics 4rack, except for the AS-1 77/UPX antenna
which is located on the Main Mast.
c. The Ship's Radar System is an AN/SPS-69 (7H422) Model R41 X. It consists of Antenna, Indicator, and Sweep
Amplifier. The antenna is mounted on a radar mast at the forward end of the Deckhouse. The antenna is cabled into the
Pilot House where the other pieces are located. The radar power supply is 24 volts DC obtained from the 24 volt DC
distribution panel.
1-87. HYDRAUUC STARTING SYSTEM.
The Ship's Hydraulic Starting System consists of the following:
DESCRIPTION
PARAGRAPH NUMBFR
Anchor Winch Compartment
Diesel Generator and Propulsion Engine
1-89
Change 4
1-125
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