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 TM 55-1905-219-14-1
NAVIGATION SYSTEMS.
a. The Mark 27 Gym 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
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.
COMMUNICATION SYSTEMS.
a. The vessel uses communications systems located in the Pilot House. They are Transceiver AN/URC-46,
Radio Set AN/URC-80, Receive R-442, Marine VHF Transceiver DSC 500, and hand-held Portable Radios EPH/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 from the distribution panel in the
Pilot House. IFF equipment is installed in the Pilot House's electronics rack, except for the AS-177/UPX antenna which is
located on the Main Mast.
c. The Ship's Radar System is an AN/SPS-69 (7H422) Model R41X. It consists of Antenna, Indicator, and
Sweep Amplifier. The antenna is mounted on a radar mast at the forward end o 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 vol
DC distribution panel.
HYDRAULIC STARTING SYSTEM.
The Ships Hydraulic Starting System consists of the following:
DESCRIPTION
PARAGRAPH NUMBER
Anchor Winch Compartment
Diesel Generator and Propulsion Engine
Change 5 1-121
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