Is a 'deck log' the same as a 'captain's log'?

Not exactly. A 'deck log' (or 'ship's log') is the official, continuous record of the voyage. A 'captain's log' may be a more personal or summary record kept by the captain, though the terms are sometimes used interchangeably in non-technical contexts.

Who is responsible for maintaining the deck log?

Typically, the officer of the watch (OOW) is responsible for making entries in the deck log during their watch. The captain has overall responsibility for its accuracy and completeness.

Can a deck log be used as evidence in court?

Yes. A properly maintained deck log is a legal document and is often a primary source of evidence in maritime accidents, insurance claims, and legal disputes.

What kind of information is found in a deck log?

It includes navigational data (course, speed, position), weather conditions, significant events (drills, repairs, sightings), crew changes, port arrivals/departures, and any unusual occurrences.

deck log

UK/ˈdek ˌlɒɡ/US/ˈdek ˌlɔːɡ/

Technical / Nautical

My Flashcards

Definition

Meaning

A daily, official record of a ship's course, speed, position, and significant events, maintained on the bridge.

A chronological written record of operational details, observations, and notable occurrences specific to a vessel's voyage, serving as a legal document and navigational aid.

Linguistics

Semantic Notes

Specifically maritime; implies an official, sequential, and detailed record. Not to be confused with a personal diary or a general logbook for non-nautical equipment.

Dialectal Variation

British vs American Usage

Differences

Terminology is identical and standardised in international maritime practice. Spelling conventions (e.g., 'logbook' as one word) may vary slightly but 'deck log' remains consistent.

Connotations

Carries identical connotations of formality, legal accountability, and professional seamanship in both varieties.

Frequency

Equally low-frequency in general language but core terminology within the professional maritime domains of both the UK and US.

Vocabulary

Collocations

strong

maintain the deck logenter into the deck logofficial deck logship's deck loginspect the deck log

medium

complete the deck logdaily deck logdeck log entrydeck log showsreview the deck log

weak

accurate deck logdetailed deck logdeck log entrydeck log entrydeck log entry

Grammar

Valency Patterns

The officer of the watch [verb: maintained/entered/updated] the deck log.The [noun: incident/position/course] was recorded in the deck log.

Vocabulary

Synonyms

Strong

bridge logmaster's log (though this is a superset)

Neutral

ship's loglogbookofficial log

Weak

nautical recordvoyage recordmaritime journal

Vocabulary

Antonyms

unofficial noteverbal reportoff-the-record account

Phrases

Idioms & Phrases

“By the book (and the log)”

Usage

Context Usage

Business

Rare, except in shipping, logistics, or marine insurance contexts where voyage documentation is reviewed.

Academic

Used in maritime history, naval architecture, or law of the sea studies.

Everyday

Virtually never used.

Technical

Core term in navigation, naval operations, merchant marine procedures, and maritime law.

Examples

By Part of Speech

verb

British English

The cadet was instructed to deck-log the change of course promptly.
You must deck-log any sighting of navigation hazards.

American English

The mate deck-logged the equipment malfunction at 0400 hours.
Always deck-log the crew's muster results.

adverb

British English

The event was recorded deck-log accurately.
He wrote deck-log meticulously every hour.

American English

The incident was noted deck-log precisely.
She updates the record deck-log religiously.

adjective

British English

The deck-log entry was scrutinised during the inquiry.
Ensure all deck-log procedures are followed.

American English

The deck-log data proved crucial for the investigation.
Maintain proper deck-log discipline on watch.

Examples

By CEFR Level

The captain checks the deck log every day.
They write the weather in the deck log.

According to the deck log, the ship altered course at midnight to avoid heavy weather.
The maritime inspector requested to see the deck log for the previous week.

The discrepancy between the GPS data and the deck log entries raised suspicions about the vessel's reported position.
Legal liability in the collision case hinged on the accuracy and completeness of the deck log maintained by the officer of the watch.

Learning

Memory Aids

Mnemonic

Think of the ship's DECK where you walk and a LOG you write in; together, they form the official diary of the deck's journey.

Conceptual Metaphor

THE SHIP'S LIFE IS A DOCUMENTED NARRATIVE (The deck log is the authoritative text of the voyage).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Avoid translating as 'бортовой журнал' for aircraft; it is specifically 'судовой журнал' or 'вахтенный журнал'.
Do not confuse with 'журнал' meaning a magazine; here it is exclusively a record book.

Common Mistakes

Using 'deck log' to refer to a log pile on a deck (wrong).
Confusing it with an engine room log or a personal captain's diary.

Practice

Quiz

Fill in the gap

During the investigation, the authorities subpoenaed the ship's to establish a timeline of events.

Multiple Choice

What is the primary function of a deck log?

FAQ

Frequently Asked Questions

: Not exactly. A 'deck log' (or 'ship's log') is the official, continuous record of the voyage. A 'captain's log' may be a more personal or summary record kept by the captain, though the terms are sometimes used interchangeably in non-technical contexts.
: Typically, the officer of the watch (OOW) is responsible for making entries in the deck log during their watch. The captain has overall responsibility for its accuracy and completeness.
: Yes. A properly maintained deck log is a legal document and is often a primary source of evidence in maritime accidents, insurance claims, and legal disputes.
: It includes navigational data (course, speed, position), weather conditions, significant events (drills, repairs, sightings), crew changes, port arrivals/departures, and any unusual occurrences.