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Questions and Answers
What should a GMDSS Radio Operator do immediately upon receiving a DSC Distress Alert requesting J3E?
What should a GMDSS Radio Operator do immediately upon receiving a DSC Distress Alert requesting J3E?
Which of the following symptoms indicates a potential malfunction in a GMDSS station with a 24 VDC battery system?
Which of the following symptoms indicates a potential malfunction in a GMDSS station with a 24 VDC battery system?
What GMDSS equipment is utilized on board a survival craft?
What GMDSS equipment is utilized on board a survival craft?
What visual observation indicates that a reliable TELEX transmission may be possible while voice transmission is not?
What visual observation indicates that a reliable TELEX transmission may be possible while voice transmission is not?
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What type of radio communication is categorized as operational communications other than distress?
What type of radio communication is categorized as operational communications other than distress?
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When making a DSC public correspondence, how long should one wait to retry calling an unresponsive station?
When making a DSC public correspondence, how long should one wait to retry calling an unresponsive station?
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In a distress situation where you've abandoned your vessel, what should you do with the SART and EPIRB on a survival craft?
In a distress situation where you've abandoned your vessel, what should you do with the SART and EPIRB on a survival craft?
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What minimum power is required for communication with the nearest public coast station operating on 2182 kHz?
What minimum power is required for communication with the nearest public coast station operating on 2182 kHz?
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What is the requirement for emergency power sources in GMDSS radio installations for newly constructed ships?
What is the requirement for emergency power sources in GMDSS radio installations for newly constructed ships?
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How often should a full specific gravity check of a lead-acid battery be carried out?
How often should a full specific gravity check of a lead-acid battery be carried out?
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Which of the following is the most likely reason a message is erased from NAVTEX memory?
Which of the following is the most likely reason a message is erased from NAVTEX memory?
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How should the current drawn from a power supply by a receiver be measured?
How should the current drawn from a power supply by a receiver be measured?
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What is the minimum number of SARTs required to be installed on a 500GT vessel?
What is the minimum number of SARTs required to be installed on a 500GT vessel?
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What is the most likely cause for the SART red LED not turning on?
What is the most likely cause for the SART red LED not turning on?
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Which statement about GMDSS distress alerts is TRUE?
Which statement about GMDSS distress alerts is TRUE?
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What must a GMDSS Radio Operator do first when initiating a distress priority message?
What must a GMDSS Radio Operator do first when initiating a distress priority message?
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What type of signal should you transmit to locate your position when preparing to abandon your ship?
What type of signal should you transmit to locate your position when preparing to abandon your ship?
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Which frequencies should be used for 'On Scene' communication between a vessel in distress and the SAR Aircraft?
Which frequencies should be used for 'On Scene' communication between a vessel in distress and the SAR Aircraft?
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How long must the SART be able to operate in standby mode?
How long must the SART be able to operate in standby mode?
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Which statement about maintenance requirements for GMDSS equipment is FALSE?
Which statement about maintenance requirements for GMDSS equipment is FALSE?
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What adjustment can prevent a powerful signal from overpowering your receiver while listening to a neighboring station?
What adjustment can prevent a powerful signal from overpowering your receiver while listening to a neighboring station?
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What term refers to the supply of electrical energy required for distress and safety radio communications?
What term refers to the supply of electrical energy required for distress and safety radio communications?
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Which piece of equipment is essential for identifying a vessel's location during an emergency?
Which piece of equipment is essential for identifying a vessel's location during an emergency?
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What is your responsibility under a GMDS-equipped vessel in a distress situation?
What is your responsibility under a GMDS-equipped vessel in a distress situation?
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What is the signal you must transmit to locate your position using your mobile unit on board a survival craft?
What is the signal you must transmit to locate your position using your mobile unit on board a survival craft?
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In which Sea Area is continuous alerting by Digital Selective Calling (DSC) available?
In which Sea Area is continuous alerting by Digital Selective Calling (DSC) available?
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Which publication should you consult for the proper setting up and safe operation of radio equipment?
Which publication should you consult for the proper setting up and safe operation of radio equipment?
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What type of alert should be sent when a vessel catches fire for effective coordination of assistance?
What type of alert should be sent when a vessel catches fire for effective coordination of assistance?
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When listening to the transmission of a very close station, what step must you observe to prevent signal smothering?
When listening to the transmission of a very close station, what step must you observe to prevent signal smothering?
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Why is it necessary to send a distress alert when there is a fire onboard?
Why is it necessary to send a distress alert when there is a fire onboard?
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Which indicates proper operation of a single sideband (SSB) transmitter rated at 60 watts PEP output in J3E mode?
Which indicates proper operation of a single sideband (SSB) transmitter rated at 60 watts PEP output in J3E mode?
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What is the term for the supply of electrical energy needed for distress and safety radio communications on a ship during power failure?
What is the term for the supply of electrical energy needed for distress and safety radio communications on a ship during power failure?
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How often is the DSC controller required to be tested while the ship is underway?
How often is the DSC controller required to be tested while the ship is underway?
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What should be done if radio equipment is found to be defective during testing?
What should be done if radio equipment is found to be defective during testing?
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In case of a power breakdown, a reserve power source must provide power for radio equipment and emergency lights for how long?
In case of a power breakdown, a reserve power source must provide power for radio equipment and emergency lights for how long?
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What is indicated on an RF power meter when the transmitter is keyed in SSB voice mode but no sound is produced from the microphone?
What is indicated on an RF power meter when the transmitter is keyed in SSB voice mode but no sound is produced from the microphone?
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Study Notes
GMDSS C2 - Distress and Safety Communications
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When a DSC Distress Alert is received requesting J3E indicating a vessel on fire, the operator should:
- Set a continuous watch on VHF channel 70.
- Set a continuous watch on the radio telephone frequency corresponding with the frequency band where the distress warning was received.
- Set a continuous watch on the NBDP frequency associated with the frequency band on which the distress alert was received.
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Symptoms of a GMDSS station malfunction on a 24 VDC battery system (indicating potential battery charger malfunction):
- Constant 30 volts reading on the GMDSS console voltmeter.
- Voltmeter reading of 30 volts for a brief duration followed by a constant 26 volt reading after testing the station on battery power.
- Ammeter measurement indicating a high rate of charging that lowers after testing the station battery power.
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GMDSS equipment used onboard a survival craft:
- GPS
- EPIRB
- Handheld radio
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Visual observations indicating potential for reliable TELEX transmission but possible voice transmission failure:
- Indication on a meter or on the terminal of low receiver signal strength.
- Indication that the antenna has reached its maximum travel in one direction.
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Operational communications conducted by radio other than distress:
- Security related communication
- Public correspondence communication
- Operational traffic communication
- General Communication
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Waiting time before attempting a second DSC public correspondence call to a station that does not answer:
- 5 minutes
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Items to be taken onboard a survival craft following vessel abandonment due to a distress situation:
- Place the SART and EPIRB in the "ON" position and secure them to the survival craft.
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First step for a GMDSS Radio Operator when initiating a distress priority message, such as a fire onboard via INMARSAT:
- Pressing a Distress Key on the equipment
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Signal to transmit to locate position using a mobile unit while preparing to abandon ship:
- Homing Signal
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Frequencies used for "On Scene" communication between a vessel in distress and a SAR Aircraft:
- VHF Ch 16, 4125 kHz, J3E, 3023 kHz, J3E
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SART battery capacity for standby mode operation:
- Four days
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False statement regarding GMDSS equipment maintenance requirements:
- If shore-based maintenance is employed, maintenance services are required to be completed or performance confirmed unless the vessel sails to foreign ports.
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Method to prevent a powerful signal from "smothering" a receiver while listening to a neighboring station's transmission:
- Switch off the speaker and use a headset.
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Term referring to the electrical energy supply for radio installations on a ship for distress and safety communications in case of main and emergency power failure:
- Reserve source of energy
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Correct statement regarding emergency and reserve power requirements in GMDSS radio installations:
- All newly constructed ships under GMDSS must have both emergency and reserve power sources for radio communications.
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Most likely cause of a SART Red LED not turning on:
- Faulty PCB
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Method to measure the current drawn from a power supply by a receiver:
- The current meter should be placed in series with one of the receiver power leads.
-
Frequency of full specific gravity check for a lead-acid battery:
- Monthly
-
Most likely reason for a message being erased from NAVTEX memory:
- The message is older than number 150.
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Number of SARTs required on a 500GT vessel:
- Two
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True statement concerning GMDSS distress alerts, such as a fire onboard:
- The distress alert message is necessary to alert other vessels and authorities.
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Indication of proper operation of a SSB transmitter rated at 60 watts PEP output in J3E mode:
- In SSB (J3E) voice mode, with the transmitter keyed but without speaking into the microphone no power output is indicated.
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Frequency of DSC controller testing while underway:
- Once a day
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Actions to take if radio equipment testing reveals a defect:
- The Master must be notified as soon as possible.
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Duration that a reserve power source must be able to power all radio equipment and an emergency light system in case of power breakdown:
- 6 hours
-
Signal to transmit to locate a survival craft's position using a mobile unit:
- Homing signal
-
Sea Area where continuous alerting by Digital Selective Calling (DSC) coverage from VHF coast stations is available:
- Sea Area A1
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Publication to consult for proper setup and safe operation of radio equipment:
- The manufacturer's instruction manual.
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Method to rapidly and successfully report a distress incident, such as a fire onboard, to a unit capable of coordinating assistance:
- Distress alerting
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Step to prevent a strong signal from "smothering" a receiver while listening to a nearby station's transmission:
- Switch off the speaker and use a headset.
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Reason for sending a distress alert when a fire is onboard:
- The distress alert message is necessary to alert other vessels and authorities.
GMDSS C2 - Maintaining Radio Equipment
- The Operator's responsibility under a GMDSS-equipped vessel in a distress situation:
- They must be able to perform communications functions essential for the safety of their own ship and other ships.
- They may be required to render assistance if it will not affect their ship's schedule.
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Description
Test your knowledge on GMDSS Distress and Safety Communications in this quiz. The questions cover topics such as DSC Distress Alerts, symptoms of GMDSS station malfunctions, and essential GMDSS equipment needed on survival craft. Perfect for marine safety training and communication protocols.
