How to Keep a Sailing Logbook: The Practical 2026 Guide | Ekynavy

It is 4 a.m. and you are taking the watch. The person you are relieving sums up the night in two sentences, slips into their bunk, and there you are, alone at the helm. Has the wind built or eased since midnight? That cargo ship you crossed earlier — where was it heading? Did the engine run, and for how long? Without a logbook, those answers went to sleep with the previous watch.

Keeping a logbook, in leisure sailing, is not filling in an administrative form. It is keeping a discipline. It is not legally required for a private sailor — coastal or offshore — but it is a habit that changes everything: safety, handover between watches, the memory of your passages, traceability after an incident, and even the value of your boat the day you sell it. This guide explains, concretely, what to record, how often, on which medium, and above all how to use that data once you are back in port.

What a logbook is really for

People often reduce the logbook to "writing down your position now and then." In reality it serves five very different purposes — and understanding them is what gives you the motivation to actually keep it.

Handover between watches. This is the most everyday use. When you relieve someone at 4 a.m., you inherit their boat, their surroundings and their decisions. An up-to-date log tells you in thirty seconds what they did with the engine, when they tucked in a reef, which ship they were watching and why they bore away ten degrees. Without it, every watch starts from scratch.

Safety and anticipation. A single reading says nothing; a trend says everything. Reading back three barometer entries an hour apart reveals a drop you would not have felt at the time. The log turns one-off observations — wind, sea, pressure — into a readable curve, and it is that curve that makes you shorten sail before the squall, not after.

Traceability after an incident. The day things go wrong — a near collision, damage, a man overboard, an insurance claim — the first question is always the same: what happened, and when? A timestamped logbook is evidence. The memory of a tired skipper, far less so.

The boat's memory over time. How many engine hours since the last oil change? When did you last replace the anode? Which anchorage held well in a north-easterly in that bay? Kept over several seasons, the log becomes the technical and geographical memory of the boat — the kind that does not fit in one head.

Value at resale. A serious buyer hesitating between two comparable boats will almost always choose the one with a documented history: tracked engine hours, dated maintenance, recorded passages. On a boat over 35 feet, a clean logbook record can be worth several thousand euros in the negotiation, simply because it reassures.

The 8 types of log to keep

"Keeping the log" does not mean writing a novel. It means recording, at the right moment, eight families of information. The first five form the operational core; the last three make the difference when you read back, months later.

1. The watch. The backbone of the log: time of handover, GPS position, heading, speed, and a quick observation. One line per hour as standard, every thirty minutes in tough conditions.
2. Weather. Wind (direction, force, gusts), state of the sea and swell, pressure, visibility, sky. This is the raw material of anticipation: record it even when "nothing is changing."
3. The engine. Start and stop hours, levels (oil, water, fuel), temperature, and any unusual sound or behaviour. This is the log that drives maintenance and peace of mind offshore.
4. Sails. Current configuration (mainsail, genoa, staysail, number of reefs), every change and its reason, the state of the rig. Read back, this log tells how you really sailed the boat.
5. The crew. Presence and condition of each person (fatigue, seasickness), meals, safety briefings. Offshore it is a safety datum in its own right: an exhausted crew member is a risk.
6. Waypoints. Route points, departure, arrival, distances run. The framework of your passage — the one that later turns into statistics.
7. Incidents. Damage, leaks, dead electronics, failures. Anything out of the ordinary deserves a dated line — it is exactly what you look for afterwards.
8. Free observations. Encounters (ships, wildlife), notable sights, human moments on board. No regulatory value, but often what you reread with the most pleasure.

How often, and at what rhythm

There is no single right frequency — there is one per type of passage. Matching the rhythm to the sailing avoids both pitfalls: the empty log, and the log you abandon under its own weight.

Coastal sailing (a few hours)

No need to write every hour for a short hop. Departure, mid-passage, arrival, plus every notable event (weather shift, manoeuvre, dense traffic). Three to five lines are enough to keep a useful trace.

Day passage (12 to 18 hours)

One entry per hour, denser as night falls, and systematically one entry at every watch handover. This is the format where the hourly discipline truly earns its keep: it is in the dead of night that a regular log saves the handover.

Offshore passage (over 24 hours)

One entry per hour, systematic GPS fix, and a full report at 12:00 UTC every day (course, distance over the last 24 hours, weather, state of boat and crew). Add a five-minute briefing at every watch change. Consistency beats detail.

Racing and regatta

The pace quickens: one entry every fifteen to thirty minutes, especially before the start and on the beats. The goal is no longer just safety, it is the performance debrief: every gybe, every wind shift noted becomes a lesson for the next race.

Five good writing habits

A logbook is read as much as it is written. Five reflexes make it truly usable.

1. A factual sentence, not a story. "Wind veering to 280° since 14:10, second reef at 14:25" is a thousand times better than "the wind is changing and we wonder what to do." Facts can be reread; moods cannot.
2. Timestamp everything. Without a time, a note is worth nothing. Offshore, pair local time with UTC: it is the only stable reference when you cross time zones.
3. State the units. "15 knots," not "15." "1012 hPa," not "1012." The future reader — perhaps you, tired — should never have to guess.
4. Record non-events too. "Nothing to report since 3 a.m." is information: it proves the watch was attentive and the situation stable. A gap in the log proves nothing.
5. Read the previous watch at the start of yours. Thirty seconds of reading before taking the helm, and you inherit the whole context. That is where the log stops being a chore and becomes a tool.

Using the logbook after the passage

A log you fill in but never reread gives only half its value. The real richness arrives at the dock.

The post-passage debrief. Twenty minutes with the crew, log open, retracing the key moments: what worked, the botched manoeuvre, the questionable weather call. It is the best accelerator of collective progress, and it costs nothing.

The annual history. At the end of the season, aggregating every entry gives figures that motivate and inform: total miles, engine hours, longest passage, days at sea. These statistics help prepare winter maintenance and the season ahead.

Reference when deciding. Coming back to a bay you have anchored in before? A glance at the log reminds you where the anchor held, in what wind, and what to avoid. The log's memory becomes a navigation asset in its own right.

Paper or digital: which to choose

The debate is less clear-cut than it seems, because the two media do not serve quite the same purpose. For operations — quick entry, automatic position, statistics, sharing, export — digital wins clearly: it records without effort what you would forget to write by hand.

Paper still holds real value on three counts: the backup record required on board, which stays legible when the electronics die; initial training, where writing by hand embeds the reflexes; and the keepsake — that salt-stained notebook you reread years later. Many skippers keep both: digital for the everyday, paper as a safety net and as memory.

How Ekynavy structures the logbook

Ekynavy was built around one simple idea: a logbook should cost you nothing to keep and give you everything back when you read it. In practice:

• Automatic GPS tracking (a point every 10 to 30 seconds): the framework of the passage records itself, even in the background.
• Eight structured log types — watch, weather, engine, sails, crew, waypoints, incidents, observations — entered in a few seconds rather than written out.
• Built-in weather (marine warnings and GRIB files available offline) tied directly to the current passage.
• Crew sharing between co-skippers: each person enters their watches from their phone, with automatic sync.
• PDF export — clean, for insurance, resale or an inspection, generated from your real data.
• Aggregated statistics: total miles, engine hours, longest passage, computed automatically season after season.
• Offline-first: everything works without network and syncs when the connection returns — because a logbook that stops where the cellular signal ends is no use at all.

Digital does not replace the discipline of the logbook: it makes it sustainable. That is the whole point, and it is what separates a notebook abandoned after three outings from a history you reread with pleasure years later.