Captain's log
The old man's diary.
Captain's log vs Ship's log
A Ship's logbook is the official record of all the goings-ons of the ship. Crew changes, cargo changes, hourly positions, course changes, weather observations. Sightings of ships, vessels and boats, radio contacts. And even spotted wildlife can be logged in here. Normally this is done by the crewmember having the watch during their watch. And all crewmembers can see what's in there.
A Captain's log is their private log, with overlapping information, but it is more in the diary's format and less factual note keeping. In here the Captain can share their thoughts and plans, a place to write down their opinions about cargo, ship, crew and passengers, without it being a potential problem if that opinion is less favourable.
In case of an event, a captain's logbook can be used as a source of information or evidence to determine the order and reason of events.
Design
A Ship's logbook, sometimes also called Bridge journal, is always a paper book specially designed to be that, aproved by the law peoples.
The Captain's log can be anything really, just what they prefer. Digital, clay tablets, but mostly it's paper based too.
What is in there
The noon position, current and planned heading. Distance sailed in the last twenty-four hours. Weather, wind and sea information. Any planned changes in the route. Events with regards to the cargo. Reports about events. Description of crew morale.
Possesion
If a captain leaves the ship, they'll most likely take their log with them, and continue on the following pages with a new ship if they get a new command. Any information they wish to share from their logbook with a new captain they'll copy in a new document.
In case a captain is incapable of continueing to lead the ship, the logbook is a great resourse for the first mate or another officer that takes over.
That final 'calm' in the document feels so ominous. I didn't realise there were two separate logs kept, but it makes sense that a captain would have a more private one.
Explore Etrea | March of 31 Tales
Sometimes there's just not much to add to a log. What it means for the next day is anyones guess.