Radio Logbook

Introduction

The radio logbook, also known as the Radio Log or GMDSS Radio Log Book, is a professional document used on ships equipped with maritime radiocommunication systems. It provides documentary traceability for communications important to the safety of navigation, radio watchkeeping, distress alerts, urgency and safety messages, as well as radio equipment tests and checks.

In the merchant navy, radiocommunications are a fundamental component of the protection of life at sea. The Global Maritime Distress and Safety System, or GMDSS, combines different terrestrial and satellite communication systems. The radio logbook provides a structured record of their operation and of significant events affecting the ship’s radio service.

This documentation is relevant to merchant ships, passenger ships, cargo vessels, workboats, offshore vessels and other ships subject to international maritime radiocommunication requirements.

What is a radio logbook used for?

The radio logbook provides a chronological record of significant events concerning the ship’s radiocommunication service.

It may include:

• distress communications;

• urgency communications;

• safety communications;

• DSC alerts;

• GMDSS messages received or transmitted;

• relevant VHF, MF or HF communications;

• satellite communications;

• periodic equipment tests;

• operational checks;

• equipment failures;

• maintenance operations;

• repairs;

• service interruptions;

• reception or transmission problems;

• incidents affecting maritime safety.

The radio log is therefore more than an administrative record. It provides evidence that radio safety functions have been monitored and that significant events have been properly documented.

Radio logbooks and GMDSS

The Global Maritime Distress and Safety System provides the international framework for maritime distress and safety communications. GMDSS uses terrestrial and satellite communication systems to transmit distress alerts and receive maritime safety information.

Depending on the ship’s sea area and equipment, the communication systems may include:

• VHF;

• MF;

• HF;

• DSC, or Digital Selective Calling;

• satellite communications;

• NAVTEX;

• maritime safety information receivers;

• EPIRB;

• communication systems supporting SAR operations.

The radio logbook provides documentary traceability for significant events involving these systems and their associated communications.

Distress, urgency and safety communications

The distinction between distress, urgency and safety communications is fundamental to maritime radio procedures.

A distress communication concerns a situation in which a ship or person is threatened by grave and imminent danger and requires immediate assistance.

An urgency communication concerns an important situation requiring priority transmission without necessarily meeting the criteria for distress.

A safety communication provides important information concerning navigational safety, meteorological conditions or other maritime safety matters.

The radio log may record essential information relating to these communications, including date, time, nature of the message, stations involved and, where relevant, the ship’s position.

GMDSS distress procedures give absolute priority to distress communications. This hierarchy must be fully understood by radio operators and officers responsible for communications.

VHF, MF, HF and satellite communications

The radio logbook accompanies the use of the different maritime communication systems installed on board.

Maritime VHF is widely used for short-range communications between ships, shore stations, ports, Vessel Traffic Services and other relevant services.

MF and HF provide longer-range communication capabilities depending on the ship’s equipment, operating area and propagation conditions.

Satellite communications provide communication capabilities beyond the range of terrestrial radio systems and are an important part of modern maritime communications.

The radio log can therefore provide a record of significant communications and any difficulties encountered during operation.

DSC and maritime identification

Digital Selective Calling, or DSC, is an important component of GMDSS. It enables automated alerts and selective calling procedures.

DSC communications use maritime identities, particularly the MMSI, or Maritime Mobile Service Identity. Correct station identification is essential to prevent communication errors and facilitate the handling of distress alerts.

Radio operators must therefore pay particular attention to ship identity, coast station identity and other relevant stations when maintaining the radio log.

Radio procedures may also involve call signs, frequencies, channels and position information.

Equipment tests and checks

The radio logbook is also an important record for radio equipment testing and operational checks.

Depending on the systems installed on board and the applicable procedures, checks may concern:

• VHF installations;

• MF/HF equipment;

• DSC functions;

• satellite equipment;

• NAVTEX receivers;

• electrical power supplies;

• reserve batteries;

• portable radio equipment;

• GMDSS-related systems.

The purpose is to ensure that equipment required for safety communications remains operational.

When equipment does not operate correctly, the deficiency must be identified, reported and followed according to the ship’s procedures. The log can then provide a record of the failure, maintenance carried out and return to service.

Failures, deficiencies and maintenance

Technical problems are an important category of information that may need to be recorded.

Examples include:

• complete equipment failure;

• loss of communication;

• degraded reception;

• radio interference;

• atmospheric noise;

• antenna problems;

• power supply failure;

• battery deficiencies;

• satellite communication problems;

• maintenance work;

• repairs carried out on board or ashore.

Documenting these events supports continuity of the radio service and enables the master, radio personnel and technical department to monitor the condition of the installation.

Radio watchkeeping and maritime safety information

The radio service is not limited to ship-to-ship communications.

GMDSS equipment also provides access to important maritime safety information, including navigational warnings, meteorological information, safety messages, SAR information and other communications transmitted by coast stations or competent services.

ITU maritime radiocommunication publications provide information concerning coast stations and special service stations, helping mariners identify stations, frequencies, services and relevant watchkeeping arrangements.

The radio logbook provides a record of significant information received and relevant radio events.

Radio logbook and onboard organisation

Maintaining the radio log requires a defined onboard organisation. Personnel responsible for distress and safety communications must have the appropriate qualifications and competence.

The master retains overall responsibility for the operation of the vessel and must ensure that applicable procedures are followed.

The radio log should be:

• chronological;

• legible;

• accurate;

• complete;

• consistent with other shipboard records;

• available for inspection;

• retained according to applicable requirements.

Information concerning distress communications may also need to correspond with entries made in the bridge logbook.

Inspections and compliance

The radio logbook may be examined during ship inspections. Authorities may verify the availability and condition of radio equipment, applicable certificates, operator qualifications and the quality of radio records.

Port State Control may examine radio equipment and documentation demonstrating that safety communication systems are properly maintained and operated.

A properly maintained radio log therefore facilitates inspections and demonstrates continuity in the monitoring of the ship’s radio service.

Radio logbooks and other nautical documentation

The radio logbook forms part of a much wider professional documentation system.

On a merchant ship, it may be used together with:

• the bridge logbook;

• the engine-room logbook;

• the general logbook;

• GMDSS documentation;

• radio certificates;

• maritime radiocommunication publications;

• SAR documentation;

• meteorological publications;

• nautical charts;

• sailing directions;

• safety documentation.

Publications from organisations such as Shom, Admiralty, NGA and other hydrographic or maritime authorities may complement this documentation, particularly for navigation, port approaches, coastal information and voyage planning.

Who uses radio logbooks?

Radio logbooks are primarily relevant to professionals involved in maritime radiocommunications and vessel operations.

They may be used by:

• masters and ship commanders;

• deck officers;

• GMDSS operators;

• radio personnel;

• merchant vessel crews;

• passenger ship crews;

• cargo vessel crews;

• offshore vessels;

• workboats;

• QHSE personnel;

• maritime instructors;

• technical and maintenance departments.

They are also useful as training material for GMDSS procedures and maritime safety communications.

Conclusion

The radio logbook is an essential professional document for maintaining traceability of the ship’s radiocommunication service. It records distress, urgency and safety communications, equipment tests, deficiencies, maintenance activities and other events that may affect the safety of life at sea.

In a maritime environment where VHF, MF, HF, DSC and satellite communications are integrated into GMDSS, accurate documentation provides a clear overview of the operation of the radio service.

The radio logbook therefore provides a documentary link between radio equipment, qualified personnel, safety procedures and maritime inspection authorities.

FAQ

What is a radio logbook used for?

It provides a chronological record of significant events involving the ship’s radiocommunication service, including distress, urgency and safety communications, equipment tests and technical deficiencies.

What is a GMDSS Radio Log Book?

A GMDSS Radio Log Book is the radio record used to document operations and events associated with the Global Maritime Distress and Safety System.

Which communications should be recorded?

Distress, urgency and safety communications are key elements of the radio log. Applicable procedures also determine which additional information must be recorded.

Does the radio logbook cover VHF communications?

Yes. VHF is one of the main maritime radiocommunication systems, and relevant communications and deficiencies may be recorded in the radio log.

Should DSC activity be recorded in the radio log?

Relevant DSC distress, urgency and safety events and communications form part of the information that may need to be recorded according to applicable procedures.

Are radio equipment tests recorded?

Yes. Periodic tests and operational checks of radio equipment and associated power systems must be documented in accordance with applicable requirements and onboard procedures.

What should be done when radio equipment fails?

The failure should be reported according to the ship’s procedures, entered in the appropriate records and followed through until corrective action has been completed or the equipment has been restored to service.

What is the difference between a radio logbook and a bridge logbook?

The radio log focuses on the radiocommunication service, whereas the bridge log covers a wider range of navigation and ship-operation events. Certain important communications may therefore need to be reflected in both records.

What is the role of the ITU in maritime radiocommunications?

The ITU establishes the international framework for radiocommunications and publishes technical and operational information concerning the maritime mobile service, coast stations, frequencies and GMDSS.

Can a radio logbook be electronic?

Depending on applicable regulations and shipboard procedures, some radiocommunication records may be maintained electronically. Availability, integrity, retention and traceability remain essential requirements.