# Knotbook — Maritime log book

> Maritime log book (iPhone/iPad app by Marcos Ponte Soares.)

- Source: https://appshunter.io/ios/app/knotbook/id6821695532 (this page in markdown: same URL + `.md`)
- Developer: [Marcos Ponte Soares](https://appshunter.io/developer/838239336)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 30 MB
- Languages: American English, French (France), German (Germany), European Spanish
- Released: 2026-10-19
- Data updated: 2026-10-22

## What is Knotbook?

Knotbook keeps your ship’s log for you. Start a voyage, or simply cast off, and Knotbook records your track, course, speed and weather in the background, with no signal needed. When you’re back, every passage is a clean logbook and part of your record of sea miles.

AN AUTOMATIC LOG
• Starts the voyage when the boat gets moving and logs the departure
• Writes an entry every hour and after every course change: position, course, speed, barometer and weather
• Records your track offline, in the background, with the screen off
• Notices when you stop and asks “anchored or arrived?”
• Low-power GPS mode while you’re at anchor or waiting to leave

ONE TAP FOR EVERYTHING ELSE
Reef, sail change, engine on/off, anchored, moored, watch change or a quick note: one tap and it’s in the log with time and position. Set wind force, sea state and visibility yourself when you know better than the forecast.

WEATHER, EVEN OFFLINE
Download the forecast before you leave and Knotbook keeps it on board, logging it at departure. The phone’s barometer adds the pressure trend to every entry.

CONNECTS TO YOUR BOAT
Join the boat’s WiFi and Knotbook finds your instruments: NMEA 0183 gateways and Signal K servers. Wind, depth and the boat’s own GPS go into the log, and engine on/off is logged automatically from the engine RPM, with engine hours.

YOUR SEA TIME, READY FOR YOUR NEXT LICENCE
Every crew member gets their own record: days on board, days as skipper, miles, night hours on watch and non-stop passages. Knotbook checks your progress against the RYA Yachtmaster Coastal and Offshore prerequisites and exports a record of seagoing experience as a PDF to go with your application.

A LOG YOU CAN TRUST
• The skipper signs off each voyage, which locks it; later changes show up
• Every edit is kept in an audit trail and amended entries are marked
• Crew who sailed on a voyage can’t be deleted, so nobody loses their sea time

AFTER THE VOYAGE
See distance, time under sail and engine, night hours and time at anchor, with your track on a map. Export the logbook as PDF, the track as GPX, or the entries as CSV.

YOUR DATA STAYS YOURS
No account and no sign-up. Your log lives on your phone. Back it up in one tap to iCloud Drive, Files or any storage app you use, and restore it on a new phone.

MADE FOR CRUISING SAILORS
• Several boats: your own, a friend’s, a charter yacht
• Navigation zones and forecast entries for French-flagged boats (Division 240)
• English, French, German and Spanish, including the PDFs
• Light and dark themes for day and night watches

Knotbook is a logbook, not a navigation app: it has no charts, routing or alarms. Always navigate with proper charts and keep a good lookout.

Sea-time requirements change and differ between schemes; check the official requirements before applying for a certificate. Knotbook is not affiliated with or endorsed by the RYA. Continued use of GPS in the background can reduce battery life.

## Is Knotbook safe?

Not enough ratings yet to assess Knotbook.

## Is Knotbook legit?

Knotbook appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Knotbook is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-20

No release notes.

## More apps by Marcos Ponte Soares

- [LocateMeUp](https://appshunter.io/ios/app/locatemeup/id838239333)
- [SwissMe](https://appshunter.io/ios/app/swissme/id1505068830)
- [TravelGuideMe](https://appshunter.io/ios/app/travelguideme/id1514958739)
- [BritishMe](https://appshunter.io/ios/app/britishme/id1528896248)
- [CanadianMe](https://appshunter.io/ios/app/canadianme/id1530714700)
- [AussieMe](https://appshunter.io/ios/app/aussieme/id1530718047)

All apps by Marcos Ponte Soares: https://appshunter.io/developer/838239336

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-22.*