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Subel. D
6 questions
Subelement D

Display & Control Systems

Section 34

EBL, Azimuth and True Bearing

The purpose of the Electronic Bearing Line is to:

  • Indicate your own vessel's heading.
  • Correct Answer
    Measure the bearing of a specific target.
  • Indicate True North.
  • Display the range of a specific target.

Answer B. is the only answer including the word "bearing", so it's the right answer.

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The Electronic Bearing Line is:

  • The ships heading line.
  • A line indicating True North.
  • Used to mark a target to obtain the distance.
  • Correct Answer
    A line from your own vessel to a specific target.

Answer B. is the only answer including the word "bearing", so it's the right answer.

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Which of the following inputs is required to indicate azimuth?

  • Correct Answer
    Gyro signals.
  • Synchronizer
  • Resolver.
  • Range rings.

"Gyro" stands for Gyro-Compass, a mechanical compass relying on gyroscopic forces instead of the Earth's magnetic field to point to the geographic North Pole instead of pointing to the magnetic North Pole.

In doing so the Gyroscope acts as a compass by measuring and displaying the difference in alignment between the ship's heading and the geographic North Pole.

Heading is a synonym for Azimuth.

The signal from a gyro is required to keep True North (0 degrees) is located at the RADAR display's 12 o'clock position, thus Answer A. is the right answer.

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Bearing information from the gyro is used to provide the following:

  • The heading of the nearest target.
  • Range and bearing to the nearest target.
  • Correct Answer
    Vessel's own heading.
  • The range of a selected target.

Bearing information from the gyro is used to provide the vessel's own heading.

In a maritime context, the gyrocompass is a crucial instrument that provides accurate heading information for a vessel. The gyrocompass measures the rotational motion of the Earth and provides a reliable reference point for determining the vessel's heading.

By utilizing bearing information from the gyro, the vessel's own heading can be determined. The gyrocompass helps establish the vessel's orientation with respect to true north, allowing for accurate navigation, course plotting, and position fixing.

Knowing the vessel's own heading is essential for various navigational tasks, including determining the desired course, steering the vessel along a specific track, and maintaining a safe heading in relation to navigational aids or other vessels.

Mnemonic: "Heading Source"

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Which of the following statements about "true bearing" is correct?

  • The ship's heading flasher is at the top of the screen.
  • Correct Answer
    True North is at the top of the screen and the heading flasher indicates the vessel's course.
  • The true bearing of the nearest target is indicated.
  • The relative bearing of the nearest target is indicated.

"Up" on a map is always True North (0 degrees) and the RADAR display is like a map.

The ship's Heading Flasher refers to the momentary increase in intensity of the RADAR's drawing line when that line coincides with the ship's heading, thus Answer B. is the right answer.

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A true bearing presentation appears as follows:

  • The bow of the vessel always points up.
  • The course of the five closest targets is displayed.
  • Correct Answer
    North is at the top of the display and the ship's heading flasher indicates the vessel's course.
  • The course and distance of the closest target is displayed.

"Up" on a map is always True North (0 degrees) and the RADAR display is like a map.

The RADAR system uses a Gyro (Gyro-Compass) to measure the ship's heading, although due to wind, currents and inertia a ship's course might differ from its heading.

Even though Answer C. says "the ship's heading flasher indicates the vessel's course" instead of its heading, it's still the right answer for this exam.

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