Merchant Navy ships’ official logs project

A log book is the official record of life on a ship, and includes information about what has happened during each voyage. The requirement for the master of a ship to keep official log goes back to about the 18th century; as a result of the Merchant Shipping Act of 1850 British merchant ships were legally required to keep an official log.

From 1852 logs start to appear among official records, but after 1874 they appeared to be routinely discarded when vital information had been extracted. However there was a legal requirement to keep logs that contained information on a birth, marriage or death as this was often the only recorded mention of the event. The ships’ official logs can be found at the National Archives in series BT 165.

Project background

Starting in 2014, The National Archives recruited volunteers to transcribe the information contained in ships’ official logs into our online catalogue. There are over 40,000 merchant navy ships’ logs in BT 165 series. Their catalogue entries have been enhanced as part of a project supported by dedicated team of volunteers and staff from the London Family History Centre as well as The National Archives.

Volunteers worked with great care to extract information from each and every log, such as ship name and official number, as well as the date(s) of voyage(s). The combined effort of each volunteer’s work was invaluable in making this collection more accessible: it is now searchable by ship name as well as official number and date of voyage on Discovery, our catalogue.

What the logs tell us

Official logs of British merchant ships provide details such as the nature of voyage, and the port and date at which the voyage commenced and terminated. The logs also provide details of the crews, for example the capacity in which they were engaged on board the vessel and their characters.

Unfortunately the official logs are not always a daily diary of a ship’s life or the activities of crew or passengers. They can be more of a ‘parish register’ for the ship, noting vital information about the crew and passengers. These include new arrivals on board (such as births or the signing on of a new crew member); departures (such as death, disappearance, desertion, or signing-off of a crew member at an intermediary port before the end of the voyage); marriages and illness. These can be seen for example in the log belongs to SS Umkuzi (BT 165/1337), which registered the death of four Indian emigrants.

Handdrawn table spanning two pages of a log book, showing details connected to the deaths of Indian emigrants

Log book of SS Umkuzi showing the registered deaths of Indian emigrants (catalogue reference: BT 165/1337)

A ship’s official log can also show details of disciplinary action taken against crew member or passengers on board, such as the log of SS Teucer (BT 165/1663). This ship was used to transport the first Chinese Labour Company of about 1000 from Wei-Hai-Wei via Yokohama to England; during the voyage some of the labours were put in irons as a result of ‘inciting to mutiny’.

Handwritten entry in a log book showing the details of four ringleaders who incited mutiny

Log book of SS Teucer showing entries of four ringleaders who incited mutiny (catalogue reference: BT 165/1663)

Generally logs also provide a snapshot of life at sea. The log of SS Cassis (BT 165/986) graphically portrays of the withdrawal symptoms from alcohol which lead to the suicide of a crew member.

Researchers of the First World War will also find the collection useful as all surviving logs for the period between 1914 and 1919 have been preserved and form part of the series. SS San Wilfredo was a British tanker belonging to the Eagle Oil Transport Company; the ship’s log details how the vessel hit a German mine. This was the first British merchant vessel to be sunk just one day before Britain formally entered the First World War, and the crew one of the first to be taken as prisoners of war.

This project will certainly enhance the reader’s appreciation for life at sea, and for the lives and personalities of the crews of these vessels plying their trade both in peacetime and war.

Find out more information about volunteering at The National Archives.

Related blogs

Merchant Navy shipwrecks in the First World War

Indexing the Merchant Navy Crew Lists and Agreements


  1. Ian Kinder says:

    I am looking for the Engineering Log Books and the Bridge logs book for the Empress of Ireland from Departure from Liverpool on February 21st and arrived on March 1st, 1914 on her 93rd West Bound Voyage. The commander was James Anderson Murray and the Chief Engineer was William Sampson.

    The incident that I am looking for was a faulty steering gear that was out of action for 6 hours.

    Thanking you in advance,
    Ian Kinder

    1. Nell Brown (Admin) says:

      Hi Ian,

      We’re unable to help with research requests on the blog, but if you go to our contact us page: you’ll see how to get in touch with our record experts via phone, email or live chat.

      Good luck with your research.


  2. Mary Snee says:

    Looking for any logs from the bridge of the ‘ ss Elswick Tower’ 1914 – 1918.
    Commanded by Captain Henry Byers for duration of First World War.

  3. Cethin Davies says:

    What records do you hold for ships sunk during WWII? Specifically the MV Nottingham lost with all hands on 7th November 1941: she belonged to The New Zealand Shipping Company and I lost an Uncle as a result of this sinking.

    1. Nell Brown (Admin) says:

      Hi Cethin,

      We’re unable to help with research requests on the blog, but if you go to our contact us page: you’ll see how to get in touch with our record experts via phone, email or live chat.

      Good luck with your research.


  4. Percival James Smith. says:

    I was a seamen on board the MV Cromwell (Official No. 169659) in 1946 at anchor in Sin galore when I met with an accident and taken aboard a Hospital Ship for treatment.Any chance of finding particulars of this incident as i need it to make a disability claim.

    1. Nell Brown (Admin) says:

      Hi Percival,

      We’re unable to help with research requests on the blog, but if you go to our contact us page: you’ll see how to get in touch with our record experts via phone, email or live chat.

      Good luck with your research.


  5. Graham Thompson says:

    Some of these log books contain sensitive data on living persons, for example the enquiry about an accident at sea posted above. I’m also working in the archives sector and would like to hear how TNA manages compliance with the Data Protection Act for records in BT 165.

    1. Nell Brown (Admin) says:

      Hi Graham,

      Thank you for your interest in these records, and apologies for the slow reply – the author has been away.

      Our Data Protection Officer will be contacting you shortly to answer your request for advice on how the National Archives manages compliance with the Data Protection Act for BT 165.



  6. John Leonard Hill says:

    My father Leonard Rowland Hill (1914-2004) served with the Royal Navy during WW2 1940-45. I do not know his service number but think he acheived the rank of Petty Officer and I believe he was a Gunner. He told me that he served as RN Gunner on merchant ships at some time and mentioned ships called the Setler and the Malampus. He sailed from and to Liverpool on some merchant convoys.
    He was born at Bridgwater Somerset England 30/01/1914. During his navy service he visited countries such as India, USA, Australia, Russia also parts of Africa and South America. This is about all the information I have. Until now I have been unable to trace any record of his R.N. service any help or advice would be gratefully received. My best regards John Leonard Hill.

    1. Liz Bryant (Admin) says:

      Hi John,

      Thanks for your comment.

      We can’t answer research requests on the blog, but if you go to our ‘contact us’ page at you’ll see how to get in touch with our record experts by email, live chat or phone.

      Best of luck with your research.

      Kind regards,


  7. Beth Mantle says:

    My grandfather was a merchant navy Captain in the First World War
    Carlton Edward Magrath

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