Navigate · Log Book
The log writes itself. You add the story.
Every hour, the log book records position, heading, speed, wind speed and direction, sea state, and sail set — drawn from the bus, no typing required. Significant events — sail changes, watch handovers, engine starts, course alterations — are tagged automatically when they happen. You add free-text notes when something is worth recording in your own words.
What gets recorded
Automatic, manual, and event-tagged in one record.
The log has three types of entry. Automated entries happen on a fixed interval. Manual notes go in when you have something to say. Events are tagged in real time when something changes on the bus.
Export formats
Three ways out, for three different uses.
The log lives locally in IndexedDB on the hub, synced to the cloud when online. When you need to hand it to someone — an insurer, a customs official, a charter company — it exports in the format they need.
Insurance and legal
A formatted PDF that reads like a traditional ship's log: date, position, conditions, events, crew signatures, voyage summary. This is the format insurers and flag state authorities recognise. Includes a page with the vessel's particulars (name, MMSI, flag, skipper) and a signed declaration.
Analysis and import
A flat CSV with one row per log entry and one column per field: timestamp, latitude, longitude, SOG, COG, TWS, TWD, depth, barometer, sail set, crew notes. Opens cleanly in a spreadsheet. Useful for post-passage analysis — fuel consumption, speed on each tack, wind angle distribution.
Integrity-verified archive
A JSON document containing the full log with a SHA-256 fingerprint of each entry signed by the boat's platform key. Tamper-evident. You can verify the log was not edited after the fact. Intended for long-term archive and for interoperability with other platforms that can consume structured log data.
2024-07-11T15:00:00Z 39°32.8N 003°02.4E COG 091° SOG 6.1kn TWS 15kn TWD 042° Depth 58m Sail: Main+Genoa Baro 1014hPa
Note: wind building from N, Formentera visible to starboard, good visibility.
2024-07-11T15:22:00Z [SAIL CHANGE] Genoa furled to 80% · 18kn gust · crew: 2
2024-07-11T16:00:00Z 39°33.2N 003°22.1E COG 089° SOG 5.2kn TWS 19kn TWD 350° Depth 74m Sail: Main+Genoa@80 Baro 1012hPa
Roadmap
Auto-population now. Crew co-edit and AI summaries coming.
Auto-population + export
Hourly auto-entries from the bus. Manual notes and event tagging from the cockpit. PDF and CSV export. IndexedDB local store, mirrored to the cloud. Signed JSON archive format.
Crew co-edit + formats
Multiple crew members can add notes from their own devices concurrently — changes merge via the bus. Insurance-ready format presets for UK, French, Spanish, and Italian flag state requirements. Offline-first edit queue for passages without connectivity.
AI trip summaries
The AI agent can generate a narrative passage summary from the log entries: "I sailed 245 nautical miles in 38 hours, top wind 32 knots at 0240 on the second night, one sail change to reefed main and staysail." The kind of entry you'd want in the cruising log but never actually write.
See the log book in the demo.
The demo populates a synthetic log from a sample passage so you can see the format, the event tags, and the export flow. Or look at the platform overview for how the log connects to the rest of the stack.