# SeaBase — The Sailor's Toolbox > Offline sailing companion with anchor alarm, charts, GPS, tides, and logbook. (iPhone/iPad app by Yeoman Ventures LLC.) - Source: https://appshunter.io/ios/app/seabase/id6786122931 (this page in markdown: same URL + `.md`) - Developer: [Yeoman Ventures LLC](https://appshunter.io/developer/6785116999) - Category: Navigation, Utilities - Price: Free - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 16.6 · 80 MB - Languages: American English - Released: 2026-07-20 - Data updated: 2026-09-30 - Monetization: paid ## What is SeaBase? Less apps. More sailing. Seabase is the offline-first sailing companion. Anchor alarm, offline nautical charts, GPS navigation, tides, and a logbook — every tool you need on the water, all working without a signal. No accounts. No ads. PAY ONCE Seabase is a paid app — a single one-time purchase, and it's yours forever. No subscription, nothing auto-renews, no in-app purchases, no ads. Every offline chart region offered is included with unlimited downloads. You pay once and get the whole app. ANCHOR ALARM Drop a virtual anchor and Seabase watches your position with phase-based drift detection — scope warnings, drift alerts, and critical alarms with sound and vibration. A sliding-window filter rides out GPS noise instead of waking you for it. Arm it after the fact with "Already Anchored" mode, pause and resume on the fly, and control the whole watch from your wrist. Replay any past anchor session on a scrubbable radar track. Built to wake you before your boat does. OFFLINE CHARTS Download nautical chart regions to your phone with OpenSeaMap seamarks built in. A global base layer keeps you covered when you sail past your downloaded zone. NOAA depth overlays for US waters when online. GPS NAVIGATION Long-press the chart to plan a route — built-in land detection flags legs that cross land. Live navigation gives you bearing, distance, ETA, cross-track error, and remaining distance with heading-up auto-rotation. Save routes and replay them. A dedicated GPS Navigator adds a radar HUD plus point-to-point go-to. APPLE WATCH Native watchOS companion — speed, heading, anchor radar, and a navigation arrow on your wrist. Arm, disarm, pause, and resume the anchor alarm from the watch. Start and stop trip recording remotely. Mirrors your iPhone's dark/light theme. TIDES 3,500+ tide stations worldwide, completely offline. NOAA-accurate harmonic prediction from a bundled database — no API call, no signal needed. A clear "now" hero card with a trend chart and high/low times. NEARBY PLACES An offline harbor and anchorage finder covering 25 cruising regions worldwide — marinas, fuel docks, pump-outs, ramps, and more — with a searchable list and an offline map view. Hand off any place straight to the GPS Navigator. LOGBOOK Auto-tracking trip recorder with idle detection, photos, notes, and a speed graph. Shareable trip cards with a route preview. CSV export. Sail Recap turns any recorded trip into a shareable highlight video. REFERENCE Knots with animations · COLREGS rules · NATO phonetic alphabet · Safety-equipment guide (US, EU, AU, UK) · VHF MAYDAY / PAN PAN / SÉCURITÉ guide · IALA buoyage. EMERGENCY Always-dark emergency screen so it works at night. Heave-to guide, quick-reference distress procedures, MOB tracker, and rescue contacts. PRIVACY Your trips, photos, and routes never leave your phone, and your GPS position is never sent anywhere. The only network calls are to map/chart tile hosts for first-time region downloads. No accounts, no analytics, no tracking. LICENSE Recreational use only. Not a substitute for professional navigation equipment, official charts, or sailing certifications. You are responsible for your safety on the water. Built by sailors. Yeoman Ventures LLC, California. www.seabase.app · gosailing@seabase.app ## Key features - Offline nautical charts - Anchor alarm with drift detection - GPS navigation and route planning - Offline tide predictions - Harbor and anchorage finder - Auto-tracking logbook - Reference guides and emergency tools ## Is SeaBase safe? Not enough ratings yet to assess SeaBase. ## Is SeaBase legit? SeaBase has limited verification signals. The AppsHunter Legitimacy Score for SeaBase is 58 out of 100 points across 7 verification signals from App Store and developer data. ## Frequently asked questions about SeaBase ### Does SeaBase have ads? No, SeaBase is completely ad-free. The app is a one-time purchase with no subscriptions, in-app purchases, or advertisements. ### What devices does SeaBase support? SeaBase is available for iPhone and Apple Watch. The watch app provides key navigation and anchor alarm controls directly on your wrist. ### How often is SeaBase updated? The latest version of SeaBase is 1.0.1, last updated on July 23, 2026. Updates typically include new features and improvements based on user feedback. ### Can I use SeaBase offline? Yes, SeaBase is designed as an offline-first application. All core features, including charts, navigation, tides, and the anchor alarm, work without a cellular signal. ### What is the price of SeaBase? SeaBase is a paid app with a single, one-time purchase price of $4.99. This purchase grants you lifetime access to all features and chart regions. ### What is the age rating for SeaBase? SeaBase has an age rating of 4+, making it suitable for a wide range of users. The app's straightforward interface and essential tools are designed for ease of use. ### How does the anchor alarm in SeaBase work? The anchor alarm uses phase-based drift detection to monitor your position. It provides scope warnings, drift alerts, and critical alarms with sound and vibration, designed to wake you before your boat does. ### Can I export my data from SeaBase? Yes, SeaBase allows for CSV export of your logbook data. You can also share trip summaries with route previews and a highlight video called Sail Recap. ## Version history (last 4 releases) ### 1.1.1 — 2026-08-12 New Learn section — brush up on marine terminology, whether you're just starting out or want a quick refresher. Boat parts, navigation lights, and the terms every sailor should know, all in one place. Knot guide refreshed — clearer step-by-step images so you can tie along, knot by knot. Cleaner sail recording screen — a redesigned main view that keeps the numbers that matter front and center while you're underway. ### 1.1.0 — 2026-08-06 The Logbook has been rebuilt from the ground up — and there's a new way to relive your sails. A real ship's log Voyages are now a proper deck log. Departures, arrivals and hourly fixes are recorded for you with position, log reading, course and speed. Add your own entries for sail changes, watch changes, weather, engine and incidents — including voice notes transcribed on the device, offline. Crew, vessel and sea time Keep a crew roster, record who was aboard and who had the helm. Add your boat and track engine hours and maintenance intervals. A new Sea Time screen totals your qualifying passages toward RYA, USCG and MCA milestones, and any voyage can be countersigned by your skipper right on the phone. Export your log Save a voyage as a GPX track, a printable PDF deck log, or a sea-service form. Sail Recap, reimagined Replay a recorded sail as a film on the offline chart. Your track draws in behind the boat, photos appear at the spot you took them, and the camera follows the passage from wide establishing shots to close-ups. Scrub the timeline, tap the map to explore freely, and browse photos full screen with the time, position, speed and heading from that moment. Apple Watch Log a fix from your wrist while a voyage is recording. Refinements - Home screen retuned for readability at arm's length in daylight - Fixed photos that could go missing from older trip logs - Speed graphs now follow your theme and speed units Everything still works completely offline. ### 1.0.1 — 2026-07-23 A readability & safety release — bigger read-outs where they matter most, plus offline US depth charts. Bigger GPS position read-outs Your GPS position is now displayed in a larger font on the main screen and the Emergency screen, so it's legible at a glance — or over the radio — even at arm's length. Emergency screen now in light theme The entire Emergency section switched from dark to light so it stays readable in direct sunlight, exactly when you need it most. Large-text support Onboarding and the rest of the app now adapt cleanly if you use enlarged text. US NOAA charts offline Official NOAA depth charts for US waters are now available as an optional download and work fully offline. Your choice: downloaded charts or the live online charts. Navigation & safety guides reorganized The guides have been restructured so the most critical information — VHF radio procedures, distress signals, heavy-weather tactics — is right at hand. Minor Bug Fixes ### 1.0 — 2026-07-21 No release notes. ## Apps similar to SeaBase | App | Rating | Price | Category | | --- | --- | --- | --- | | [moodSailor](https://appshunter.io/ios/app/moodsailor/id6762207362) | — | Free | Navigation | | [Waypoint: Outdoor Navigation](https://appshunter.io/ios/app/waypoint-outdoor-navigation/id6762064660) | 5.0 (2) | Free | Navigation | | [Ship Tracking & Vessel Finder](https://appshunter.io/ios/app/ship-tracking-and-vessel-finder/id6753588538) | 5.0 (2) | Free | Navigation | | [SeaVectors: Marine Navigation](https://appshunter.io/ios/app/seavectors-marine-navigation/id6747519514) | — | Free | Navigation | | [Boat Logbook & GPS Tracker](https://appshunter.io/ios/app/boat-logbook-and-gps-tracker/id6757792916) | — | Free | Navigation | | [SharpMap](https://appshunter.io/ios/app/sharpmap/id6745105772) | — | Free | Navigation | ## More apps by Yeoman Ventures LLC - [QLUB - Find Your People.](https://appshunter.io/ios/app/qlub-find-your-people/id6785116997) All apps by Yeoman Ventures LLC: https://appshunter.io/developer/6785116999 --- *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 2026-09-30.*