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</p> Signup and view all the answers

    What is a safety transmission?

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

    Where can VTS be mandatory?

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

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

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

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