STCW Communication Systems 5 — Questions and Answers
Question 1: What does the urgency signal 'PAN-PAN' indicate in maritime radiotelephony?
- An immediate threat to life requiring rescue
- A very urgent message concerning safety of the ship or a person, but not immediate danger to life (Correct answer)
- A navigational hazard warning for other vessels
- A routine priority message from a coast guard station
Correct answer: A very urgent message concerning safety of the ship or a person, but not immediate danger to life
PAN-PAN indicates an urgent situation concerning safety of a vessel or person that does not yet require immediate rescue assistance.
Question 2: Under GMDSS, which Sea Area covers the range served by MF radio (approximately 150-400 nm from shore)?
- Sea Area A1
- Sea Area A2 (Correct answer)
- Sea Area A3
- Sea Area A4
Correct answer: Sea Area A2
Sea Area A2 is defined as the area, excluding Sea Area A1, within radiotelephone coverage of at least one MF coast radio station (approximately 150-400 nm).
Question 3: What is the function of the DSC frequency 2187.5 kHz?
- MF radiotelephony distress calling frequency
- MF DSC distress alerting frequency (Correct answer)
- HF telex frequency for routine communications
- Working channel for ship-to-ship MF communications
Correct answer: MF DSC distress alerting frequency
2187.5 kHz is the dedicated MF DSC frequency for transmitting and receiving digital distress alerts in Sea Areas A1 and A2.
Question 4: How should a vessel respond upon receiving a DSC distress alert from another ship?
- Immediately transmit a DSC acknowledgment on 2187.5 kHz
- Wait at least 5 minutes before acknowledging to avoid congesting the distress frequency (Correct answer)
- Proceed to the distress position without making radio contact
- Acknowledge only if directed by coast guard authorities
Correct answer: Wait at least 5 minutes before acknowledging to avoid congesting the distress frequency
To avoid simultaneous transmissions that block the distress frequency, vessels should wait before acknowledging so the nearest coast station or rescue authority can respond first.
Question 5: What is the power output requirement for a fixed VHF radio installation under SOLAS?
- 1 watt minimum
- 6 watts minimum
- 25 watts minimum (Correct answer)
- 100 watts minimum
Correct answer: 25 watts minimum
SOLAS requires fixed VHF radio installations to have a minimum power output of 25 watts to ensure adequate range for ship-to-ship and ship-to-shore communications.
Question 6: What is the purpose of the Long-Range Identification and Tracking (LRIT) system?
- To provide two-way data communications between ships and their owners
- To allow flag states and port states to receive vessel identity and position reports at long range (Correct answer)
- To replace AIS for vessels operating beyond VHF range
- To transmit voyage data recorder information ashore automatically
Correct answer: To allow flag states and port states to receive vessel identity and position reports at long range
LRIT provides flag states, port states, and coastal states with the ability to receive identity and position information about SOLAS vessels at global range.
Question 7: Which international body is responsible for maintaining and updating GMDSS regulations?
- International Telecommunication Union (ITU)
- International Maritime Organization (IMO) (Correct answer)
- International Labour Organization (ILO)
- World Meteorological Organization (WMO)
Correct answer: International Maritime Organization (IMO)
The IMO is responsible for GMDSS regulations through SOLAS Chapter IV, while the ITU regulates the radio frequency allocations used by GMDSS.
STCW Communication Systems 5
What does the urgency signal 'PAN-PAN' indicate in maritime radiotelephony?