Bridge Logbook

Introduction

The bridge logbook is an essential document on board merchant ships, passenger ships and, more broadly, vessels subject to maritime navigation safety requirements. Maintained under the authority of the Master and primarily completed by deck officers on watch, it provides a chronological record of navigation activities, prevailing conditions and events that may be significant to the safety of the vessel and persons on board.

The bridge logbook is therefore a genuine operational record of the vessel. It accompanies the ship from departure to arrival, recording information relating to navigational watches, position, course, speed, weather conditions, manoeuvres, changes in navigation status and significant events.

For merchant shipping professionals, the bridge logbook is closely associated with SOLAS, COLREG, STCW, the ISM safety management system and established bridge watchkeeping procedures.

What is the purpose of a bridge logbook?

The main purpose of a bridge logbook is to record important events relating to navigation and vessel safety. It should provide sufficient information to reconstruct the voyage and the main navigational events afterwards.

Depending on the vessel and the company’s procedures, records may include:

• date and time of events;

• commencement and completion of watches;

• vessel position;

• course and course alterations;

• vessel speed;

• weather and sea conditions;

• visibility;

• bearings and other relevant navigational information;

• manoeuvres;

• changes in navigation status;

• navigation in specific or restricted areas;

• machinery movements relevant to navigation;

• pilotage operations;

• anchoring and departure operations;

• safety-related events;

• incidents, abnormalities or unusual situations;

• drills and relevant checks;

• events affecting the safety of life at sea.

The bridge logbook does not replace other statutory or operational records. It forms part of a wider documentation system that may include the engine-room logbook, radio logbook, safety records, ISPS records, environmental record books and navigation documentation.

Bridge watchkeeping

Bridge watchkeeping is one of the fundamental functions associated with the bridge logbook. The officer in charge of the navigational watch must maintain an appropriate lookout, monitor the vessel’s route, use navigation equipment correctly and respond to changes in the navigational situation.

The logbook provides a record of the principal events occurring during each watch. It therefore creates a chronological account of how the vessel was navigated.

This traceability is particularly important in demanding conditions such as heavy traffic, restricted visibility, coastal navigation, narrow channels, port approaches, traffic separation schemes, night navigation or severe weather.

Records should remain consistent with the company’s procedures and the Master’s standing orders. Recording information must never interfere with the officer’s primary responsibilities for lookout and safe navigation.

Navigation information recorded in the logbook

The bridge logbook can be used to record the information required to monitor the vessel’s route and maintain a continuous record of navigation.

For example, during a voyage between Le Havre and Rotterdam, officers may record major course alterations, visibility conditions, traffic situations, important communications with vessel traffic services and significant events during the watch.

During a voyage between Marseille and Genoa, the logbook may also record changes of course, weather conditions, traffic and events associated with the approach to port.

Accurate records become particularly important when navigating close to shore, within a traffic separation scheme or in areas with high vessel density.

Weather and sea conditions

Weather information has an important place in the bridge logbook. Wind, visibility, sea state, swell, precipitation, fog and significant weather changes may be recorded according to the procedures applicable on board.

Such information provides a record of the conditions under which navigation took place.

It can also help explain decisions made by the Master or officer of the watch, such as reducing speed, altering course, increasing lookout arrangements or adapting navigation to restricted visibility.

Navigation equipment and integrated bridge systems

The bridge logbook must be considered within the technological environment of modern ships.

A contemporary navigation bridge may include:

• ECDIS;

• radar and ARPA;

• GNSS and positioning systems;

• AIS;

• gyrocompass;

• magnetic compass;

• autopilot;

• BNWAS;

• echo sounder;

• GMDSS communication equipment;

• VDR;

• meteorological and maritime safety information systems.

The use of sophisticated equipment does not eliminate the need for accurate logbook entries. On the contrary, the greater the number of interconnected systems, the more useful reliable event recording becomes.

The logbook may record an equipment malfunction, temporary loss of a signal, a change of positioning source, radar failure or a particular mode of ship control whenever the event is relevant to navigational safety.

ECDIS, charts and nautical publications

Professional navigation relies on the combined use of electronic systems, nautical charts and appropriate nautical publications.

The bridge logbook operates within this documentary environment alongside electronic and paper charts, sailing directions, lists of lights, tide tables, radio-navigation publications and navigational warnings.

Publications from Shom, Admiralty, NGA and other hydrographic authorities may therefore form part of the information used during voyage planning and navigation.

The logbook does not replace these publications. Instead, it records the navigation activities and decisions carried out using the information available on board.

Manoeuvring, pilotage and port operations

The bridge logbook becomes particularly important during manoeuvring operations.

Arrival and departure from port may involve recording various events: bridge preparation, standby manoeuvring condition, engine readiness, pilot boarding, changes in steering arrangements, anchor operations, transit through channels and navigation within regulated traffic areas.

In ports such as Rotterdam, Antwerp, Hamburg, Le Havre, Marseille or Singapore, navigation may be influenced by dense traffic, channels, tugs, vessel traffic services and specific port procedures.

Accurate logbook entries provide a clear chronological record of the main stages of such operations.

Special situations and safety events

The importance of the bridge logbook becomes particularly evident when an unusual event occurs.

Entries may relate to:

• restricted visibility;

• a close-quarters situation;

• a navigational warning;

• equipment failure;

• loss of propulsion affecting navigation;

• steering gear abnormalities;

• significant alarms;

• man-overboard situations;

• search and rescue operations;

• severe or exceptional weather;

• urgent course alterations;

• intervention by the Master.

The purpose is not to turn the logbook into a complete incident investigation report. Where required, a separate report is prepared under the vessel’s and company’s procedures. The bridge logbook then provides the factual chronological record of the event.

Bridge logbook and inspections

The quality and consistency of bridge logbook entries may be examined during inspections and audits.

Port State Control may verify the vessel’s compliance, equipment, operation and documentation. Navigation records can contribute to demonstrating that watchkeeping and safety procedures are being properly implemented.

The logbook may also be reviewed during:

• ISM audits;

• flag State inspections;

• classification society surveys;

• investigations following incidents or accidents;

• internal safety reviews;

• documentary compliance checks.

Clear, chronological, factual and consistent entries are therefore essential.

Paper and electronic bridge logbooks

Bridge logbooks may exist in traditional paper form or as approved electronic records where permitted by the applicable requirements.

Electronic systems can facilitate storage, searching and traceability. However, digitisation does not remove the requirements for reliability, integrity, availability and proper control of records.

The format used must comply with the requirements of the flag State Administration, the applicable regulations and the company’s document-control procedures.

A professional document for navigation officers

The bridge logbook is primarily relevant to:

• Masters;

• Chief Officers;

• Officers in Charge of a Navigational Watch;

• deck cadets;

• navigation and safety managers;

• shipping companies;

• maritime training institutions;

• passenger ships;

• merchant ships;

• cargo vessels and tankers;

• specialised vessels.

It provides a practical framework for understanding and applying the principles of bridge watchkeeping, navigation and event recording.

Conclusion

The bridge logbook is much more than a simple navigation diary. It is an essential component of the vessel’s navigational traceability and safety management system.

It provides a chronological record of significant events, weather conditions, navigational decisions, manoeuvres and special situations encountered during a voyage. Together with SOLAS, COLREG and STCW requirements, it contributes to a structured and disciplined approach to professional navigation.

In the modern bridge environment, where ECDIS, radar, AIS, GNSS, VDR and integrated bridge systems operate together, accurate record keeping remains fundamental. Publications and nautical information from Shom, Admiralty, NGA and other hydrographic organisations complement this documentation framework by providing the information required for voyage planning and safe navigation.

FAQ – Bridge Logbook

What is a bridge logbook?

A bridge logbook is the record in which important navigational activities and events affecting the safety of the vessel are entered in chronological order.

Who completes the bridge logbook?

It is mainly completed by officers in charge of the navigational watch under the authority of the Master and in accordance with the vessel’s procedures.

What information is recorded in a bridge logbook?

It may include position, course, speed, weather, visibility, manoeuvres, course alterations, incidents and other events relevant to navigational safety.

Is a bridge logbook mandatory?

Requirements depend on the vessel, flag State and applicable regulations. For vessels covered by the relevant requirements, navigational activities and incidents important to safety must be recorded.

What is the difference between a bridge logbook and an engine-room logbook?

The bridge logbook primarily concerns navigation, ship handling and related safety events. The engine-room logbook concerns the operation and maintenance of propulsion machinery and auxiliary systems.

Can a bridge logbook be electronic?

Yes. Electronic recording systems may be used where they meet the applicable regulatory and approval requirements.

Does a bridge logbook replace nautical charts?

No. It is a navigational record and complements the charts, ECDIS and nautical publications required for the voyage.

Why is the bridge logbook important during inspections?

It provides a chronological record of navigation and significant events and can help demonstrate that watchkeeping and safety procedures have been properly followed.

Which regulations are particularly relevant to bridge watchkeeping?

The main international references include SOLAS for safety of navigation, COLREG for preventing collisions at sea and STCW for seafarer training and watchkeeping.