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Subel. E
6 questions
Subelement E

Survival Craft Equip & S.A.R.:

Section 28

SART - Radar Display - SAR - AIS SART:

How does the searching vessel's radar interrogate a survival craft SART?

  • Activate the IFF interrogation system.
  • Correct Answer
    The SART responds automatically and transmits the 12-blip signal when it detects the search craft or other vessels' X-Band radar signal.
  • Maintains watch on VHF-FM Ch-70 for the SART's unique identifier.
  • The SART responds automatically when it detects the search craft or other vessel's 10-cm radar signal.
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What radar display changes indicate the correct approach to a SART and what care should be taken in a SAR situation?

  • The line of dots indicate the SART's position, the dots become increasing arcs as the distance to the SART lessens, rescuing vessels should increase speed to reach Distress more quickly.
  • A line of dots on a radar screen rotates to indicate the SART's position along its line of bearing; rescuing vessels should steer for the center of the line of dots.
  • Correct Answer
    The line of dots indicate the SART's position, the dots become increasing arcs as the distance to the SART lessens, rescuing vessels should reduce speed as the arcs get greater in degree.
  • The line of dots indicate the SART's position, the dots become decreasing arcs as the distance to the SART lessens, rescuing vessels should reduce speed as the arcs lessen in degree.
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How can rescue personnel detect that a SART is transmitting in the immediate vicinity?

  • The DSC unit will react to the SART's signal and respond with the two-tone auto alarm.
  • The SART can provide an approximate location to within a two nautical mile radius, per IMO standards.
  • The SART signal appears as a target which comes and goes; the effect of heavy swells on a SART.
  • Correct Answer
    The SART's dots on the PPI will become arcs and then eventually become concentric circles.
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What signal is detected as originating from an AIS SART and how is the signal displayed?

  • Correct Answer
    An AIS SART signal is shown on any AIS receiver as a special MMSI-like coded symbol.
  • The 3-cm radar reflections are converted to AIS signals and displayed on ECDIS/ARPA screens.
  • An AIS SART transmits on AIS frequencies and the signals are converted to 3-cm radar targets for display on 3-cm radars.
  • An AIS SART transmits on 9 GHz so that a 3-cm radar can display the signals.
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How can vessel personnel detect the operation of a SART in its vicinity?

  • A unique two-tone "warbling" signal heard on VHF-FM Ch-70.
  • It will activate an AIS new signal alarm on the AIS receiver.
  • The SART signal appears as a target that comes and goes -- due to the effect of heavy swells on a SART.
  • Correct Answer
    A unique 3-cm signal consisting of a 12-dot pattern radiating outward from a SART's position along its line of bearing.
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What is not an advantage of an AIS SART signal when compared to a radar-based SART signal?

  • Correct Answer
    The AIS SART can be detected much farther away than radar SART models.
  • Not every AIS transmission needs to be received to achieve an accurate presentation of the location.
  • The AIS SART position has GPS accuracy and transmits on AIS VHF frequencies.
  • AIS SART units may be easier to find in poor radar target conditions.
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