moodSailor vs SeaBase

moodSailor is a nautical navigation app for sailors, boaters, kayakers and anyone who spends time on the water. It works offline, runs on your phone, and respects your privacy. NAVIGATION - Man overboard: MOB button on every screen, alarm, bearing and drift area - COG, SOG, max and average speed - Distance travelled, current GPS position, magnetic heading - Compass: fixed or rotating mode - Head-up course-over-ground compass - Reorderable metric cards - Custom cockpit panels: your cards, your sizes - Regatta mode: course marks, start sequence with flags and countdown, over-early alert - Signal K and NMEA instruments on the cockpit: heading, depth, wind - TVMDC calculator, units converter and IALA region card MAP - OpenStreetMap base layer with OpenSeaMap nautical chart overlay - Official charts where a hydrographic office publishes one free: Norway, US, Canada, Iceland, Netherlands, Spain - Offline tile caching: pick an area, layers and zoom - One-tap Map/Satellite view switch - Adjustable overlay opacity - Download tiles, weather, marine data and marks - Three rotation modes: north up, COG-aligned, compass-aligned - Follow mode with position marker and heading line - Route tool: draw, measure, save multi-leg routes - Sketches: draw freely on the map in eight colours, save by name, export as KML or GeoJSON - Route deviation watch: alarm when your heading leaves the course, even with the screen off - Anchor watch: circle or polygon around the drop point, alarm if the boat drags - Navigational warnings: French AVURNAV, Canada, Croatia and relayed authorities WEATHER, CURRENTS AND TIDES - Wind, ocean currents, waves and swell from Open-Meteo - Wave and swell height, direction and period - Choose the forecast sheet's weather fields - Animated particles or wind-barb arrows - Smooth heatmap with colour scale - Forecast time slider - Tide curve integrated in the sea-level row - Every recorded GPS point carries its weather, currents, waves and tide GPS TRACES - Recording interval: 1, 2 or 5 seconds - Background mode: keeps running with screen locked - Live trace coloured by speed - Resilient to GPS dropouts - Native iOS location manager for reliable background recording - Editor: mini-map, altitude graph, weather, currents, tide - Six denoising rules - Import via "Open With" from Files, Mail - Export to GPX, GeoJSON, CSV or KML POINTS OF INTEREST - Create, edit and delete POIs - Nautical marks: the full IALA set, incl. wreck and preferred channel - POIs on the map with type-specific icons - Mark detail pages: light rhythm, cardinal topmark - Lit marks flash their real light rhythm on the map - OpenSeaMap nautical marks: download as POIs, search by signal code - Export points, seamarks or your position as GPX, KML, CSV or GeoJSON AR POI FINDER - Live camera with augmented-reality POI markers - Compass ribbon with cardinal labels - Configurable distance range and marker size - Immersive full-screen mode - OpenSeaMap nautical marks and saved POIs visible in AR view - Camera detects the real horizon line - Night light ID: matches flash rhythm against charted lights AIS VESSEL TRACKING (optional) - Live nearby vessel positions on the map and in AR POI Finder - Course and speed indicators - Vessels rendered as kites under way and circles when stopped - AR vessels at real angular size - Status icons on vessel symbol - Predicted AR positions from last course/speed KNOWLEDGE - Built-in reference: glossary, beacons, ship lights, day marks, wind, magnetism, currents, tides - Search, sources, illustrations - Interactive tide tool: pick a point on the map - Morse & ICS signal flags: text->code/flag SETTINGS - 25 languages - Units: distance, speed, altitude, temperature, coordinates - Themes: light, system, dark - Weather model selector - Offline regions list with size and delete PRIVACY - No account, no ads, no tracking - Your data stays on your device - Train the fleet: opt-in sightings sharpen recognition

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