Maritime Communication Quiz

You are operating a vessel in rough seas when you spot another vessel signaling "SOS" using Morse code with a flashlight. How should you identify the correct sequence of flashes for "SOS" based on Morse code conventions?

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Which of the following is TRUE about transmitting an SOS signal using Morse light?

• The signal must be sent in a continuous stream without pauses.

• It consists of three short, three long, and three short flashes.

• It can be transmitted in any random sequence as long as it's bright.

• The distress signal should only be transmitted via radio.

Under COLREGS Annex IV, which of the following is a key requirement for a distress signal to be considered valid?

• It must be transmitted only at night when visibility is low.

• It must be recognized internationally and indicate grave and imminent danger.

• It must be directed only toward the nearest vessel for immediate assistance.

• It must be accompanied by a sound signal such as a whistle or foghorn.

In the context of the International Code of Signals (ICS), how should a vessel interpret an SOS distress signal transmitted via Morse light?

• As a non-urgent request for assistance that can be acknowledged when convenient.

• As an indication of a navigational hazard rather than a direct distress call.

• As an internationally recognized call for immediate help, requiring a response.

• As a signal that must be relayed to coastal authorities before taking any action.

If a vessel receives an SOS signal via Morse light but is unable to provide direct assistance, what is its obligation under international maritime law?

• It must attempt to confirm the distress signal through radio communication.

• It is only required to respond if the distressed vessel is in its territorial waters.

• It should take no action unless directly hailed by the distressed vessel.

• It must immediately proceed to the location of the distressed vessel, regardless of its own safety conditions.

Which of the following best describes the purpose of single-letter signals in the International Code of Signals (ICS)?

• To indicate distress and request immediate rescue

• To simplify and speed up visual communication between vessels

• To transmit complex navigational instructions via Morse light

• To replace radio communication entirely in poor weather conditions

While conducting nighttime navigational signaling exercises aboard your vessel, you are tasked with distinguishing between long and short flashes using a visual Morse code light. Based on standard signaling conventions, how should you ensure accurate differentiation?

• A long flash is approximately three times the duration of a short flash.

• A long flash is twice as bright as a short flash.

• A short flash must always be followed by a pause, while a long flash does not.

• A long flash is used only for distress signals, while short flashes are for general communication

While navigating international waters, your vessel receives a recognized distress signal, "SOS," transmitted via Morse light from another ship in distress. Based on COLREGS Annex IV, what action must you take to respond appropriately to this situation?

• Acknowledge the signal and take immediate action to provide assistance or relay the distress to authorities.

• Only respond if your vessel is within a designated rescue zone.

• Wait for repeated distress signals before verifying authenticity.

• Flash a response signal using your navigation lights.

Which of the following single-letter signals in the International Code of Signals (ICS) is correctly matched with its meaning?

• "R" – Request permission to dock

• "Q" – I require immediate medical assistance

• "C" – Stand by for further instructions

• "N" – Negative, no

While monitoring maritime communication during your vessel's journey, you notice another ship transmitting the Morse light signal "O" repeatedly. Based on the International Code of Signals, what action should you take in response to this signal?

• Assume the vessel is experiencing a medical emergency and prepare to assist.

• Interpret the signal as an indication of operational delay and wait for further communication.

• Recognize the signal as "Man overboard" and take immediate action to assist in recovery.

• Conclude the vessel is requesting a pilot and relay the message accordingly.