Quiz 09: Operational Procedures - Distress Communications

1. Who has the ultimate legal authority to command the transmission of a marine distress alert or voice MAYDAY call from a vessel?

Any crew member or passenger who feels nervous about the weather. The master, skipper, or person responsible for the safety of the vessel at that time. The marina manager or shore-based fleet coordinator via phone link. The technician who installed the radio equipment.

Correct Answer: B. Under international and domestic maritime law, a distress signal can only be authorized by the master or individual in command of the vessel.

2. What specific condition must be met to justify the transmission of an absolute 'Distress' level signal (DSC Distress or Spoken MAYDAY)?

The vessel has run out of fuel but is safely anchored inside a calm harbor. A vessel or person is threatened by grave and imminent danger and requires immediate assistance. A passenger requires a routine medical prescription top-up from shore. The vessel's main alternator has failed, though auxiliary batteries are fully charged.

Correct Answer: B. A distress designation is strictly reserved for scenarios involving grave and imminent danger where immediate, life-saving rescue intervention is required.

3. In a spoken voice distress call over VHF Channel 16 or MF 2182 kHz, how many times should the distress signal word 'MAYDAY' be repeated during the initial call setup?

Once only Exactly 3 times Continuously until someone interrupts 5 times without stating the boat name

Correct Answer: B. The standard international radiotelephony format mandates repeating the signal word "MAYDAY" exactly three times to ensure receiving stations distinguish it clearly from background noise.

4. Which of the following details forms the core minimum requirement of a voice 'Distress Message' broadcast after making the initial call?

The home port address and the insurance company policy number. Vessel name/identity, position coordinates (or bearing), nature of distress, number of persons on board, and intentions of the master. A list of cargo items and the brand name of the vessel's radar set. The destination port details and total fuel tank capacity records.

Correct Answer: B. The standard distress structure uses the acronym MIPIDAN (or similar formats) to ensure identity, position, problem, POB count, and action plans are clearly transmitted to rescuers.

5. What action should be taken if a shipboard operator hears a DSC digital distress alert on VHF Channel 70 but no coast station voice response is heard on Channel 16 after several minutes?

Clear the log and ignore the signal completely. Listen on Channel 16, note down the details, and prepare to manually relay the distress call by voice to assist the target vessel. Press the digital 'Acknowledge' button on the radio immediately to clear the station alarms. Switch the transmitter to a low-power private harbor channel to call a local marina.

Correct Answer: B. If shore stations fail to answer a distress signal, nearby vessels must listen on Channel 16 to gather facts and prepare a voice relay to alert search centers without breaking the original digital transmission loop.

6. What international signal phrase is used to introduce an official voice distress relay message being sent on behalf of another vessel?

MAYDAY SECURITE MAYDAY RELAY (repeated three times) PAN PAN MEDICO ALL STATIONS URGENT

Correct Answer: B. "MAYDAY RELAY" is the official regulatory phrase used to flag that the transmitting station is passing along an emergency message for another vessel in distress.

7. Under what condition is it appropriate for a ship operator to transmit a 'MAYDAY RELAY' message?

The vessel in distress is too far from a shore station to be heard, but you can hear them and have the means to relay their message to rescue authorities. You want to test if your transmitter can reach long-distance shore receivers. The target vessel has a minor mechanical breakdown and wants a tow from a commercial provider. You observe an empty, anchored vessel drift slightly inside an anchorage area.

Correct Answer: A. A relay is warranted if a vessel in distress cannot contact rescue authorities directly, or if the crew on a vessel observing an emergency has additional details to pass along.

8. Which station has the legal right to impose absolute radio silence on a distress channel if background chatter interferes with emergency communications?

Any vessel currently moored inside a nearby commercial harbor. The vessel in distress, or the specific station controlling the rescue operations. A passing vessel that is not involved in the rescue operation. The local weather observation bureau center.

Correct Answer: B. The station in distress or the primary on-scene rescue coordinator has the authority to order radio silence to protect critical safety communications.

9. What specific radio command phrase must be spoken by the controlling station to enforce absolute silence on a frequency handling active distress communications?

CLEAR THE AIR IMMEDIATELY SEELONCE MAYDAY STOP TRANSMITTING SAFETY OUT OF SERVICE NOW

Correct Answer: B. "SEELONCE MAYDAY" (derived from the French word for silence) is the official regulatory command phrase used to enforce radio silence on a frequency.

10. What regulatory phrase can a vessel use to request radio silence if it is *not* controlling the emergency but finds its safety work blocked by background chatter?

SEELONCE MAYDAY SEELONCE DISTRESS QUIET ZONE PLEASE TERMINATE CHANNELS NOW

Correct Answer: B. Non-controlling vessels use the term "SEELONCE DISTRESS" to signal to other stations that they are disrupting active emergency communications.

11. What message prefix pattern indicates that emergency operations on a channel have concluded and normal radio operations can resume?

MAYDAY OVER AND OUT SEELONCE FEENEE PRUDONCE ROUTINE CANCEL DISTRESS ENTIRELY

Correct Answer: B. "SEELONCE FEENEE" (silence finished) is the official phrase broadcast by the controlling station to announce that emergency radio silence has lifted.

12. What phrase is used to signal that a frequency is transitioning from absolute silence to restricted, cautious usage while rescue work is still under way?

SEELONCE FEENEE PRUDONCE RESTRICTED MODES ONLY CAUTION TRAFFIC ACTIVE

Correct Answer: B. The word "PRUDONCE" informs stations that they may resume urgent or essential transmissions on the channel with caution, while keeping routine chat offline.

13. When responding by voice to an active standard MAYDAY call from another vessel, what critical piece of information should your reply include?

Your own position coordinates, speed, and your estimated time of arrival (ETA) to their location. The name of the marina where you plan to spend the weekend. A review of local weather trends over the past week. Your radio license document numbers.

Correct Answer: A. Responding vessels must provide their position and ETA so the casualty and rescue centers can coordinate assistance effectively.

14. What mandatory requirement applies to any vessel radio station that intercepts an active voice distress call on Channel 16?

Switch off the radio unit to avoid distracting noise on the bridge. Maintain a continuous watch on Channel 16, keep a written log of details, and refrain from transmitting until the coast station answers. Immediately broadcast a call to other local vessels to ask for their opinions. Switch immediately to a commercial channel to continue routine work.

Correct Answer: B. Intercepting stations must log the emergency details and keep the channel clear to give professional shore stations the opportunity to coordinate the rescue.

15. Why should a vessel operator prioritize voice follow-up methods over alternative alerts after a DSC digital distress alert has been fired?

Digital alerts carry no legal weight without voice verification. Voice broadcasts provide critical context about the emergency, allow responders to ask clarifying questions, and help rescue vessels locate the craft using radio direction finding equipment. Voice calls automatically double the radio's physical transmission range. Shore centers are legally prohibited from launching boats based solely on digital text alerts.

Correct Answer: B. The digital alert flags the emergency, but follow-up voice contact delivers the operational details needed to launch and coordinate target search assets.