Competence 6: Respond to distress signal at sea

This comprehensive learning module covers the essential knowledge, understanding, and proficiency (KUP) required to respond effectively to distress signals at sea, with a focus on the International Aeronautical and Maritime Search and Rescue (IAMSAR) manual.

Understanding Distress Signals and Communications

Distress signals are internationally recognized communications indicating that a vessel or individuals are in grave and imminent danger, requiring immediate assistance. The International Convention for the Safety of Life at Sea (SOLAS) outlines various methods for transmitting distress signals, including:

• Radio communications (VHF, MF, HF)
• Visual signals (flares, flags, arm signals)
• Sound signals
• Electronic devices (EPIRB, SART)

Types of Distress Calls

1. Mayday: The most urgent distress call, used when there is immediate danger to life or vessel.
2. Pan-Pan: Used for urgent situations that are not immediately life-threatening.
3. Securité: Used to transmit safety-related information.

Distress traffic takes absolute priority over all other transmissions. Anyone receiving a distress call must immediately cease any transmissions that may interfere with the call and listen on the frequency used for the call4.

IAMSAR Manual Overview

The International Aeronautical and Maritime Search and Rescue (IAMSAR) manual is a comprehensive guide jointly published by the International Maritime Organization (IMO) and the International Civil Aviation Organization (ICAO). It consists of three volumes2:

1. Volume I: Organization and Management
   • Focuses on the global SAR system concept
   • Guides the establishment of national and regional SAR systems
2. Volume II: Mission Coordination
   • Assists personnel in planning and coordinating SAR operations
3. Volume III: Mobile Facilities
   • Designed for rescue units, aircraft, and vessels
   • Provides guidance on search, rescue, and on-scene coordination

Key Procedures for Responding to Distress Signals

1. Immediate Actions:
   • Maintain a continuous listening watch on distress frequencies (e.g., VHF Channel 16).
   • Upon receiving a distress signal, immediately alert the ship’s master1.
2. Communication:
   • Acknowledge receipt of the distress alert promptly.
   • Use proper radio procedures as outlined in the IAMSAR manual.
   • Relay distress messages to appropriate authorities if necessary.
3. Assessment and Planning:
   • Determine the nature of distress and required assistance.
   • Assess your vessel’s capability to provide aid.
   • Plan the most effective approach to render assistance.
4. Coordination with SAR Authorities:
   • Establish communication with the responsible Rescue Coordination Center (RCC).
   • Provide regular updates on your position and estimated time of arrival3.
5. On-Scene Actions:
   • Upon arrival, establish communication with the distressed vessel.
   • Assess the situation and provide immediate assistance as required.
   • Coordinate actions with other responding vessels or aircraft.

Distress Alert Procedures

When transmitting a distress alert, follow these steps1:

1. If possible, transmit the ALARM SIGNAL for 30 seconds to one minute.
2. Send the DISTRESS CALL: “Mayday Mayday Mayday. This is … (name or call sign of ship spoken three times).”
3. Send the DISTRESS MESSAGE: “Mayday” followed by the name or call sign of the ship, position, nature of distress, and any other relevant information.

Digital Selective Calling (DSC) Distress Alerts

The Maritime Safety Committee has approved a revised procedure for responding to DSC distress alerts by ships5:

• Radio personnel should be aware of the consequences of transmitting a distress call relay.
• Ships should not transmit a DSC distress alert relay on receipt of a DSC distress alert on VHF or MF channels.
• Distress call relays on HF channels should be initiated manually.

Important Considerations

• False Alarms: Be aware of the penalties for transmitting false distress signals.
• Equipment Familiarity: Ensure all crew members are familiar with distress signaling equipment and procedures.
• Regular Drills: Conduct regular drills to maintain proficiency in distress response procedures.
• Authorization: Distress alerts, acknowledgements, and relays can only be transmitted with the permission of the ship’s master5.

Conclusion

Responding effectively to distress signals at sea is a critical skill for all maritime professionals. Thorough knowledge of the IAMSAR manual, combined with regular training and drills, ensures that you can provide timely and effective assistance when lives are at stake.Remember, the primary goal in any distress situation is to save lives while ensuring the safety of your own vessel and crew. Always follow established procedures and coordinate with the appropriate authorities to maximize the effectiveness of search and rescue operations.

Read More List

1. International Maritime Organization. (2019). IAMSAR Manual Volume III: Mobile Facilities. London: IMO.
2. International Maritime Organization. (2022). International Convention for the Safety of Life at Sea (SOLAS), 1974, as amended. London: IMO.
3. International Telecommunication Union. (2015). Radio Regulations. Geneva: ITU.
4. International Maritime Organization. (2018). Global Maritime Distress and Safety System (GMDSS) Manual. London: IMO.
5. International Maritime Organization. (2021). International Code of Signals. London: IMO.