Automatic Identification System (AIS) Quiz
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Questions and Answers

Why might a vessel's echo be visible on radar but not indicated on AIS?

  • The vessel is a fishing boat exempt from regulations.
  • The vessel's AIS is switched off. (correct)
  • The vessel is operating in international waters.
  • The vessel is at anchor.

    • What should the OOW keep in mind regarding AIS and collision avoidance?

  • The OOW has no duty if AIS is not functioning.
  • Some targets may go undetected despite being equipped with AIS. (correct)
  • AIS information must always be considered accurate.
  • Action is unnecessary if radar shows an echo.

    • When using AIS information on ECDIS, what must be ensured regarding datums?

  • Datums are irrelevant for collision avoidance.
  • All existing datums can be used interchangeably.
  • The same datum must be selected for GPS, AIS, and the chart. (correct)
  • Different datums should be analyzed separately.

    • What should the OOW regularly compare while using AIS?

    <p>The ship’s own data with the originating instrument's data.</p> Signup and view all the answers

    In what situations may AIS have difficulty detecting targets?

    <p>In blind or shadow sectors, or due to environmental conditions.</p> Signup and view all the answers

    What is the primary purpose of the Automatic Identification System (AIS)?

    <p>To facilitate information exchange for traffic control and monitoring</p> Signup and view all the answers

    Which ships are required to be fitted with AIS according to the IMO regulations?

    <p>All passenger ships and ships greater than 300GT on international voyages</p> Signup and view all the answers

    Which of the following is NOT a basic component of the AIS?

    <p>Magnetic compass</p> Signup and view all the answers

    What type of information does AIS transmit automatically?

    <p>Ship's identity, type, position, and navigational status</p> Signup and view all the answers

    Which VHF frequency range is utilized by AIS transceivers?

    <p>156.025 to 162.025 MHz</p> Signup and view all the answers

    What functionality does the AIS provide beyond automatic transmission?

    <p>Monitoring and tracking of ships</p> Signup and view all the answers

    How does AIS enhance navigational safety?

    <p>By aiding in the identification of targets</p> Signup and view all the answers

    Which equipment can display AIS target station information?

    <p>Radar systems</p> Signup and view all the answers

    What is the typical accuracy of the ship's positioning indicated by GPS?

    <p>10 meters</p> Signup and view all the answers

    Which information must be entered manually by Watchkeeping Officers at the start of each voyage?

    <p>Ship's draught</p> Signup and view all the answers

    What type of sensor provides the heading of a vessel?

    <p>Gyro or Magnetic Compass</p> Signup and view all the answers

    Which of the following is NOT a reason for activating alarms on AIS?

    <p>If the ship is anchored</p> Signup and view all the answers

    What type of information can be considered safety-related and may be sent to stations?

    <p>Weather information</p> Signup and view all the answers

    Which types of vessels are mentioned as not necessarily being fitted with AIS?

    <p>Fishing vessels and warships</p> Signup and view all the answers

    Which of the following items is a part of the voyage-related information that must be manually entered?

    <p>Route plan</p> Signup and view all the answers

    What is the primary benefit of using AIS in navigation?

    <p>It reduces communication time.</p> Signup and view all the answers

    What does the sleeping target symbol indicate?

    <p>No action to avoid a collision is required.</p> Signup and view all the answers

    Which symbol is used to represent a target that may require action to avoid a collision?

    <p>Activated target</p> Signup and view all the answers

    What additional information is provided with the selected target symbol?

    <p>CPA and TCPA</p> Signup and view all the answers

    When is the AIS signal classified as lost?

    <p>When the AIS signal is lost and the last position is displayed</p> Signup and view all the answers

    Which of the following is NOT included in the dynamic information transmitted by AIS?

    <p>MMSI number</p> Signup and view all the answers

    What information is transmitted every 6 minutes by AIS?

    <p>IMO number and radio call sign</p> Signup and view all the answers

    Which type of information does the AIS equipment need to be programmed with when newly installed?

    <p>Length and beam of the ship</p> Signup and view all the answers

    How frequently is the information transmitted when the ship is underway?

    <p>Every 2 to 10 seconds</p> Signup and view all the answers

    Study Notes

    Automatic Identification System (AIS)

    • AIS is a VHF-based shipboard transponder used for information exchange between ships and shore stations.
    • It transmits information like ship identity, position, course, speed, and other safety details.
    • AIS is mandatory for passenger ships, ships over 300 GT on international voyages, and those over 500 GT on domestic voyages.

    AIS Components

    • Consists of a satellite position fixing system (e.g., GPS), a VHF transceiver operating on specific channels, and a computer for processing and storing information.

    AIS Information Types

    • Static information: Programmed into the system during installation, including the ship's MMSI number, IMO number, call sign, name, type, length, and antenna location.
    • Dynamic information: Changes during the voyage and is automatically or manually updated. Includes position, UTC, course, speed, heading, navigational status, and rate of turn.
    • Voyage-related information: Manually entered at the start of each voyage, like draught, cargo type, destination, ETA, and route plan.
    • Safety-related information: Manually entered and can be sent to specific stations or all. Includes information on navigational aids, hazards, weather, and other safety concerns.

    AIS Symbols

    • Sleeping target: Used when no collision avoidance action is needed.
    • Activated target: Used when collision avoidance action may be required, with additional information like course, speed, heading, and rate of turn.
    • Selected target: Used when the user selects a target for more detailed information, including CPA and TCPA.
    • Dangerous target: Used when the target violates pre-set CPA/TCPA limits.
    • Lost target: Used when the AIS signal is lost; its last known position is displayed.

    Considerations for Using AIS

    • AIS is a valuable aid to navigation but should be used with caution.
    • It may not detect all vessels, especially those not fitted with AIS, those with AIS switched off, or those in blind spots.
    • The OOW is still responsible for collision avoidance even when using AIS.
    • Overlay of AIS information on ECDIS or radar requires careful consideration of datums.
    • AIS should be monitored and tested regularly.
    • Erroneous inputs can lead to inaccurate information.
    • AIS limitations include blind sectors, rain/sea clutter, and line-of-sight issues.

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    Related Documents

    AIS Automatic Identification System PDF

    Description

    Test your knowledge on the Automatic Identification System (AIS) used in maritime navigation. This quiz covers AIS components, the types of information exchanged, and regulations surrounding its mandatory use for various ships. Enhance your understanding of maritime safety technologies with this engaging quiz.

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