GMDSS Communication Systems

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Questions and Answers

What is programmed into the SART by the GMDSS Radio Operator prior to activation?

  • A vessel's call sign
  • A unique MMSI number
  • A vessel's position
  • A unique hexadecimal identification number (correct)

How many HF DSC Distress watch channels must be guarded by a compulsory vessel underway?

  • Two (2)
  • Six (6)
  • Four (4)
  • Three (3) (correct)

What happens when a NAVTEX receiver runs out of paper?

  • It listens to the appropriate VHF weather channel for NAVTEX messages
  • It gives off an audible and/or visual alarm
  • It cannot operate and all subsequent MSI broadcasts may be missed (correct)
  • It automatically switches to receiving MSI by SafetyNET

What action should you take after receiving an all stations DSC safety call on 2187.5 KHz?

<p>Acknowledge by RT on 2182 KHz (A)</p> Signup and view all the answers

What is a safety transmission?

<p>Health and welfare traffic concerning the protection of human life (B)</p> Signup and view all the answers

Where can VTS be mandatory?

<p>Not mentioned in the text (B)</p> Signup and view all the answers

What happens when the receiving station polls the DSC unit of the vessel in distress?

<p>The transmission is aborted and an alarm sounds to indicate this data must be provided by the operator (D)</p> Signup and view all the answers

What defines a GMDSS Sea Area A3?

<p>It is within MF RT range of at least one shore station providing continuous MF DSC alerting (C)</p> Signup and view all the answers

Under what conditions would you relay a DSC distress alert?

<p>If the mobile unit in distress is incapable of further Distress Alert communications (A)</p> Signup and view all the answers

What action would you take if a Distress alert is received on the 12 MHz DSC frequency?

<p>Use the 12 MHz DSC frequency to acknowledge/relay the alert (A)</p> Signup and view all the answers

Who has ultimate control of service at a ship’s radio station?

<p>The radio operator (C)</p> Signup and view all the answers

What is the purpose of the DSC controller in a distress situation?

<p>To acknowledge/relay the distress alert (D)</p> Signup and view all the answers

What happens when discharging a battery string and a cell becomes weaker than the remaining cells?

<p>The discharge current effectively charges the weaker cell in reverse polarity (B)</p> Signup and view all the answers

What is the standard format used by an RCC or RSC to pass information to OSC or CSS?

<p>The JASREP (A)</p> Signup and view all the answers

Why is regular updating of a ship's position necessary in an Inmarsat-C installation?

<p>To keep the correct Inmarsat region (A)</p> Signup and view all the answers

What is the first step for a GMDSS Radio Operator to take when initiating a Distress priority message via Inmarsat?

<p>Pressing a 'Distress Button' or 'Distress Hot Key' on the equipment (A)</p> Signup and view all the answers

What can happen if a DSC Distress alert is improperly transmitted or relayed?

<p>The GMDSS system in the vicinity can quickly become overburdened (C)</p> Signup and view all the answers

What is the original intention of DSC relay functionality?

<p>It was not originally an intended function but now is the preferred method (C)</p> Signup and view all the answers

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