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Subel. H
6 questions
Subelement H

Maritime Safety Information (M.S.I.):

Section 54

SafetyNET™ -1

Where NAVTEX cannot be feasibly established, what system can be implemented to provide an automated service in coastal waters to receive MSI?

  • AMVER
  • VHF DSC
  • ARQ SITOR (NBDP)
  • Correct Answer
    SafetyNET™

Where NAVTEX cannot be feasibly established, what system can be implemented to provide an automated service in coastal waters to receive MSI?

(D). SafetyNETTM

SafetyNET (tm-trade mark) is a communication function of the Inmarsat-C radio two-way data store-and-forward messaging system.

(a). AMVER is the automated mutual-assistance vessel rescue systems, where reports are sent regarding sailing plans, position, deviation, and arrival reports. These are used whenever a search and rescue efforts have to be made, to coordinate response wherever distress occurs at sea.

  • See Wikipedia article on AMVER

(b). VHF DSC, a marine radio operating on the very high frequency range (30 to 300 MHz) , and includes digital selecting calling. It is used for distress communications. The VHF band is limited to line-of-site range, but the DSC function will repeat distress calls received, and extend the propagation scope of the VHF marine radio.

(c). ARQ SITOR: SITOR is the sImplex teletype over radio transmits text messages over radio waves, kind of a radio texting. Wikipedia article on SITOR.
ARQ is a mode of telex messages in radio telegraphy that automatically requests a repeat of a message that was received with errors.

Last edited by markadlerdallas. Register to edit

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What action should a GMDSS Radio Operator take when SafetyNET™ Distress or Urgency messages are received by the vessel's EGC receiver?

  • Correct Answer
    Aural and/or visual alarms are activated and require manual deactivation.
  • No immediate action is required, as an audible tone will be generated at the beginning and end of the transmission and a paper printout of the message will be generated.
  • No immediate action is required by the operator, since the transmission will be automatically acknowledged by the receiving vessel.
  • A periodic alarm tone will be heard until the radio operator prints the message from the unit's memory.

What action should a GMDSS Radio Operator take when SafetyNETTM Distress or Urgency messages are received by the vessel's EGC receiver?

(A). Aural and/or visual alarms are activated and require manual deactivation.

Just remember it. The other choices intuitively don't seem appropriate.

Last edited by markadlerdallas. Register to edit

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What system can provide an automated service in coastal waters where it may not be feasible to establish the NAVTEX service or where shipping density is too low to warrant its implementation?

  • AMVER™
  • Correct Answer
    SafetyNET
  • VHF DSC
  • ARQ SITOR (NBDP)

What system can provide an automated service in coastal waters where it may not be feasible to establish the NAVTEX service or where shipping density is too low to warrant its implementation?

(B). SafetyNETTM

SafetyNET (tm-trade mark) is a communication function of the Inmarsat-C radio two-way data store-and-forward messaging system.

(a). AMVER is the automated mutual-assistance vessel rescue systems, where reports are sent regarding sailing plans, position, deviation, and arrival reports. These are used whenever a search and rescue efforts have to be made, to coordinate response wherever distress occurs at sea.

  • See Wikipedia article on AMVER

(c). VHF DSC, a marine radio operating on the very high frequency range (30 to 300 MHz) , and includes digital selecting calling. It is used for distress communications. The VHF band is limited to line-of-site range, but the DSC function will repeat distress calls received, and extend the propagation scope of the VHF marine radio.

(d). ARQ SITOR: SITOR is the sImplex teletype over radio transmits text messages over radio waves, kind of a radio texting. Wikipedia article on SITOR.
ARQ is a mode of telex messages in radio telegraphy that automatically requests a repeat of a message that was received with errors.

Last edited by markadlerdallas. Register to edit

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Aboard ship, SafetyNET™ messages can be received by which equipment/methods?

  • VHF DSC on the weather channels.
  • NAVTEX Receiver on 518 kHz or the Tropical Navtex frequency.
  • Correct Answer
    EGC receiver of the vessel's Inmarsat-C SES.
  • HF SITOR (NBDP) MSI frequencies.

Aboard ship, SafetyNETTM messages can be received by which equipment/methods?

(C). EGC receiver of the vessel's Inmarsat-C SES.

Only Intermarsat service provides the SafetyNET(tm) message communication. Other choices are for different purposes.

The C system of Inmarsat is a naval mobile satellite service that has the EGC, or the enhanced group call, function to send messages to a specific ship station within the coverage of the Intermarsat satellite.

The SEC is the Ship Earth Station in the Inmarsat-C SES

Please see US Coast Guard article on MARCOMMS - INMARSAT C SAFETYNET

Last edited by markadlerdallas. Register to edit

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SafetyNET™ messages can be received by which of the following shipboard equipment?

  • NAVTEX
  • MF and HF SITOR (NBDP)
  • Correct Answer
    Inmarsat-C EGC receiver
  • Inmarsat F77 EGC receiver

SafetyNETTM messages can be received by which of the following shipboard equipment?

(C). Inmarsat-C EGC receiver

The C system of Inmarsat is a naval mobile satellite service that has the EGC, or the enhanced group call, function to send messages to a specific ship station within the coverage of the Intermarsat satellite.

The SEC is the Ship Earth Station in the Inmarsat-C SES

Please see US Coast Guard article on MARCOMMS - INMARSAT C SAFETYNET

Last edited by markadlerdallas. Register to edit

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Maritime Safety Information is promulgated via satellite through which system?

  • AMVER
  • NAVTEX
  • Inmarsat-M SES
  • Correct Answer
    SafetyNET™

Maritime Safety Information is promulgated via satellite through which system?

(D). SafetyNETTM

SafetyNET (tm-trade mark) is a communication function of the Inmarsat-C radio two-way data store-and-forward messaging system.

(a). AMVER is the automated mutual-assistance vessel rescue systems, where reports are sent regarding sailing plans, position, deviation, and arrival reports. These are used whenever a search and rescue efforts have to be made, to coordinate response wherever distress occurs at sea.

  • See Wikipedia article on AMVER

(b). NAVTEX, or the navigational telex direct printing service for messages regarding weather warnings and forecasts. It is also used to communicate MSI (maritime safety information) messages.

  • See Wikipedia article on NAVTEX

(c). Inmarsat-M SES. This is a voice and fax or data communication service.

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