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Subel. F
6 questions
Subelement F
Other Equipment and Networks:
Section 45
Depth Finders, Gyro Compass, SSAS, AIS:
What is a common range of frequencies used for depth finding equipment?
  • Correct Answer
    200-400 kHz
  • 1000-2600 kHz
  • 200-800 Hz
  • 4,000-6,000 kHz
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What is a common range of pulse widths used for depth finding equipment?
  • 10 to 30 microseconds
  • Correct Answer
    25 to 600 microseconds
  • 2 to 20 milliseconds
  • 50 to 200 milliseconds
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What is the purpose of the "carbon pile" on an older gyro compass?
  • Ballast regulation
  • Precession control
  • Correct Answer
    Voltage regulation
  • Prevent pendulum effect errors
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What are the principles of operation of a fiber-optic gyro compass?
  • A fiber-optic coil and three accelerometers determine the speed of rotation of the earth.
  • Two fiber-optic coils with one accelerometer and a level sensor determine the direction of true north.
  • Three fiber-optic coils with a dual accelerometer and a yaw detector determines the direction of true north.
  • Correct Answer
    Three fiber-optic coils and a dual-axis electronic level sensor determine the direction of true north.
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How does the Ship Security Alert System operate?
  • Correct Answer
    It sends an alert to specific addresses via the Inmarsat-C terminal.
  • It sends an all ships alert via the VHF-DSC unit.
  • It sends an alert to the RCC via the Inmarsat-C terminal.
  • It sends an all ships alert via MF-HF.
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AIS units use the following:
  • VHF channels 65B ( 160.875 MHz) and 66B ( 160.925 MHz) and 9.6 kbs GMSK modulation.
  • Correct Answer
    VHF channels 87B (161.975 MHz) and 88B (162.025 MHz) and 9.6 kbs GMSK modulation.
  • VHF channels 16 ( 158.800 MHz) and 70 ( 156.525 MHz) and 4.8 kbs GMSK modulation.
  • VHF channels 18B ( 161.500 MHz) and 19B ( 161.550 MHz) and 4.8 kbs GMSK modulation.
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