Remarks books were documents kept on board British naval vessels from the mid 18th century and into the 20th century. They were an addition to the officers' logbook or the ships' logbook and intended to record hydrographic information, that would then be used by the Admiralty Hydrographic Department to create and update charts. By the early 19th century, some officers were recording meterological and oceanographic observations in the remarks book, and by the 1860s this became an almost universal practice. In 2008, a research team examined the c.6K remark books held at the UK Hydrographic Office covering the years 1800 to 1910, and made an inventory of those containing instrumental meteorological observations. This current project will now image and catalogue those remark books.