DWO Maritime Communication 2 — Questions and Answers
Question 1: When a vessel transmits a MAYDAY relay on behalf of another vessel in distress, the call begins with which phrase?
- MAYDAY MAYDAY MAYDAY
- MAYDAY RELAY MAYDAY RELAY MAYDAY RELAY (Correct answer)
- PAN-PAN RELAY
- SECURITE RELAY
Correct answer: MAYDAY RELAY MAYDAY RELAY MAYDAY RELAY
A MAYDAY relay starts with 'MAYDAY RELAY' spoken three times to distinguish it from an original MAYDAY call.
Question 2: Which DSC distress category requires a response from all vessels and coast stations within range?
- Urgency
- Safety
- Distress (Correct answer)
- Routine
Correct answer: Distress
A DSC Distress category alert demands immediate response from all stations, as it signals imminent danger to life or vessel.
Question 3: What is the maximum transmit power allowed on VHF Channel 16 for a ship station?
- 1 watt
- 5 watts
- 25 watts (Correct answer)
- 100 watts
Correct answer: 25 watts
Ship VHF radiotelephones are limited to 25 watts output power on Channel 16 and other working channels.
Question 4: A vessel receives a DSC urgency alert. The officer of the watch should acknowledge on DSC and then listen on which channel?
- VHF Ch 70
- VHF Ch 16 (Correct answer)
- VHF Ch 13
- MF 2182 kHz
Correct answer: VHF Ch 16
After acknowledging a DSC urgency alert, the watch officer listens on VHF Ch 16 for the subsequent voice message.
Question 5: The phonetic alphabet word for the letter 'K' is:
- King
- Kilo (Correct answer)
- Kappa
- Kettle
Correct answer: Kilo
In the ITU phonetic alphabet standardized for maritime use, 'K' is represented by 'Kilo'.
Question 6: Under GMDSS, which equipment must be tested daily by the officer of the watch?
- EPIRB battery voltage
- DSC controller and VHF radio watch (Correct answer)
- SART activation
- NAVTEX printer ink level
Correct answer: DSC controller and VHF radio watch
SOLAS requires the OOW to test the DSC controller and verify continuous VHF Ch 70 and Ch 16 watch daily.
Question 7: When sending a position report via INMARSAT-C, the message is transmitted as:
- Voice over satellite telephone
- Store-and-forward data telex (Correct answer)
- HF SSB voice
- VHF FM voice
Correct answer: Store-and-forward data telex
INMARSAT-C is a store-and-forward data system that sends and receives telex/data messages, not voice.
DWO Maritime Communication 2
When a vessel transmits a MAYDAY relay on behalf of another vessel in distress, the call begins with which phrase?