# Binnacle: Nautical Calculator — NAVTEX, celestial & true wind > Comprehensive sailing navigation tool with advanced calculation and logbook features. (iPhone/iPad app by Danylo Budylkin.) - Source: https://appshunter.io/ios/app/binnacle-nautical-calculator/id6523426668 (this page in markdown: same URL + `.md`) - Developer: [Danylo Budylkin](https://appshunter.io/developer/6778012130) - Category: Navigation, Productivity - Price: Free - Rating: 5.00/5 from 1 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 32 MB - Languages: American English - Released: 2024-07-29 - Data updated: 2026-09-23 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/binnacle-nautical-calculator/id6523426668/reviews.md ## What is Binnacle? Binnacle is a set of bridge instruments for merchant marine deck officers. Thirteen tools, most of them working with no signal, and none of them pretending to be more certain than it is. ON WATCH • Navigational warnings, plotted. NAVAREA and the coastal services drawn on a chart where they actually are, instead of read as a wall of text at three in the morning. Set a radius from your position and follow only the services that concern the passage. • Weather for a position and a time you choose — wind in forces, the barometric tendency, fog risk. Forecast data from MET Norway. • True wind from course, speed and apparent wind. • Manoeuvring board — CPA and TCPA for two to five contacts at once, and one alteration that clears all of them. POSITION AND CHECKS • Compass error by amplitude or azimuth, worked against celestial data for the moment you observed. • Celestial fix — reduce two or three sights and see the cocked hat plotted, with its residuals, not just a number. • ETA and passage timing in UTC, with the arithmetic shown. • Heel, trim and roll period from the phone's own sensors, with GM estimated from the roll period. RECORDS AND REFERENCE • Log book for bridge events, kept for the whole contract and handed over as a PDF. • 17,998 ports by UN/LOCODE, and 11,728 port facilities with their GISIS codes, searchable by name or code — the reference is bundled, so it works alongside. • Manoeuvring miles — passage legs with sea and manoeuvring totals kept apart. • Unit converter for the units a bridge actually uses: knots, cables, fathoms, hectopascals, tonnes and the rest. WHAT IT WILL NOT DO It is an aid, not an authority. It does not replace corrected charts, official publications, the ship's procedures or the officer's judgement. Every screen states its own limits rather than hiding them, and every export says on its face what it is. WHAT STAYS FREE True wind, ETA, compass error, the manoeuvring board, heel and trim, weather and the unit converter are free, with no limit and no trial. The log book keeps ten entries free. Celestial reduces one sight free. Port search and the match count are free. ONE PURCHASE, NOT A SUBSCRIPTION • Navigational warnings — NAVAREA and the coastal services, with the chart and the radius • The facility's own record in Port Facilities • Fixes from two or three lines of position, and the plot • PDF export, on every screen including the free ones One payment of $5.99 unlocks all of it, on every device signed in to your Apple Account. There is no subscription, nothing renews, and there is nothing to cancel. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy and Terms are also in the app, under More. ## Key features - True Wind Calculation - Celestial Navigation Tools - ETA Estimation - LogBook Management - UNLOCODE Search - NavArea Warnings ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/binnacle-nautical-calculator/id6523426668/reviews.md ### 5/5 — 😊 *2025-12-12* Спасибо вам большое👍🏼 ### 5/5 — Thank you very much for this App *2024-08-03, version 1.1.2* Very useful app logbook is very helpful. Using it while working. ### 5/5 — Good App for Navigation Officers *2024-08-01, version 1.0.2* Good App collected all required features for Officer of the Watch in one App. ### 5/5 — Good app providing unique features for Deck Officers *2024-07-30, version 1.0.1* The only known app that providing free Compass Error calculation as well as other unique features that making Deck Officer’s life easier. ## Frequently asked questions about Binnacle ### What is Mate4Mate? Mate4Mate is a free navigation app designed for sailing enthusiasts and maritime professionals. It offers tools for calculating wind, celestial navigation, estimating arrival times, managing logbooks, and searching for ports. ### Does Mate4Mate have ads? No, Mate4Mate is completely free of charge and does not contain any advertisements. ### What devices does Mate4Mate support? Mate4Mate is currently supported on iPhone devices. ### How often is Mate4Mate updated? The latest version, 2.3.5, was released on March 10, 2025, indicating regular updates to improve functionality and add new features. ### What are the key navigation features in Mate4Mate? Key features include True Wind Calculation, Celestial Navigation Tools for GHA, TLHA, and TGHA, ETA Estimation, LogBook Management, UNLOCODE Search, Maneuvering Miles Calculation, and NavArea Warnings. ### Is Mate4Mate suitable for beginners? Yes, Mate4Mate is designed to be easy to use for both experienced sailors and those just starting out, providing an all-in-one solution. ### What is the age rating for Mate4Mate? Mate4Mate has an age rating of 4+, making it suitable for a wide range of users. ### Can Mate4Mate help with safety at sea? Yes, the app includes NavArea Warnings to keep users informed about important sea events and safety updates in their region, enhancing situational awareness. ## Version history (last 5 releases) ### 3.1.0 — 2026-09-17 The app is now Binnacle. Same tools, same account, a name that says where they live — the binnacle is the stand the compass sits in on the bridge. NEW • Manoeuvring board — CPA and TCPA for two to five contacts, and one alteration that clears them all • Heel, trim and roll period from the phone's sensors, with GM from the roll period • Coastal warnings — what the local NAVTEX carries, for the waters you are closing • Unit converter, rebuilt: 13 quantities and every unit a bridge uses CHANGED • The home screen is a live panel now: position, weather, UTC, and how many warnings are in force near you. Pull it down to refresh. • Warnings can be counted by distance from your position, and you can choose which services to follow. • A dark instrument palette throughout, meant to be read at night without wrecking your eyes. • Every tool the app has can now be pinned during setup. Four of them could not be, which was a bug nobody could see. ### 2.3.6 — 2026-07-30 **This is one of our biggest updates yet!** We’ve completely redesigned the Mate4Mate experience from the ground up. Every screen, interaction, and visual detail has been refreshed to make the app feel cleaner, more modern, and easier to use. We’ve also done extensive work behind the scenes: improved performance and stability, refined navigation, polished countless small details, and fixed a large number of bugs reported in previous versions. The result is a faster, smoother, and more reliable app that feels better in every way. Thank you for using Mate4Mate - there’s even more to come! ### 2.3.5 — 2025-03-10 In this release, we’re happy to share new improvements and fixes to enhance your experience: Bug Fixes Minor Bug Fixes: Resolved several minor bugs that could have affected performance and stability. We’re committed to continuously improving your experience. Thank you for choosing Mate4Mate! We’re always working on enhancements—stay tuned for more updates. ### 2.3.4 — 2025-02-16 In this release, we’re happy to share new improvements and fixes to enhance your experience: Bug Fixes Minor Bug Fixes: Resolved several minor bugs that could have affected performance and stability. We’re committed to continuously improving your experience. Thank you for choosing Mate4Mate! We’re always working on enhancements—stay tuned for more updates. ### 2.3.3 — 2025-02-03 In this release, we’re happy to share new improvements and fixes to enhance your experience: Bug Fixes Minor Bug Fixes: Resolved several minor bugs that could have affected performance and stability. We’re committed to continuously improving your experience. Thank you for choosing Mate4Mate! We’re always working on enhancements—stay tuned for more updates. ## Apps similar to Binnacle | App | Rating | Price | Category | | --- | --- | --- | --- | | [Nautical Calculator Preview](https://appshunter.io/ios/app/nautical-calculator-preview/id1534074231) | 5.0 (1) | Free | Navigation | | [Wärtsilä iSailor](https://appshunter.io/ios/app/wartsila-isailor/id398456162) | 3.1 (11) | Free | Navigation | | [CamSextant](https://appshunter.io/ios/app/camsextant/id1076411081) | 4.3 (6) | Free | Navigation | | [Celestial Nav](https://appshunter.io/ios/app/celestial-nav/id1569880598) | 4.3 (10) | Free | Navigation | | [FindShip - Track vessels](https://appshunter.io/ios/app/findship-track-vessels/id768240068) | 3.5 (993) | Free | Navigation | | [iNavX: Marine Navigation](https://appshunter.io/ios/app/inavx-marine-navigation/id286616280) | 4.8 (21,564) | Free | Navigation | ## More apps by Danylo Budylkin - [Deckmint AI Presentation Maker](https://appshunter.io/ios/app/deckmint-ai-presentation-maker/id6778012128) - [Unstuck: ADHD Focus & Tasks](https://appshunter.io/ios/app/unstuck-adhd-focus-and-tasks/id6779562324) - [Fastix: Fasting Timer & Diet](https://appshunter.io/ios/app/fastix-fasting-timer-and-diet/id6780178790) - [Portbook Sea Ports](https://appshunter.io/ios/app/portbook-sea-ports/id6797213460) - [Fathom: Marine Exam Prep](https://appshunter.io/ios/app/fathom-marine-exam-prep/id6813876741) All apps by Danylo Budylkin: https://appshunter.io/developer/6778012130 ## Related topics [binnacle](https://appshunter.io/ios/topics/binnacle) · [true-wind calculator](https://appshunter.io/ios/topics/true-wind-calculator) --- *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 2026-09-23.*