NaviLog

NaviLog — The Digital Logbook for Skippers NaviLog turns your phone into a complete sailing logbook: automatic GPS track recording, a physics-based anchor alarm, one-tap man-overboard marking and a barometric storm warning — all working 100% offline and without an account. Your logbook belongs to you: it is stored locally on your device, not in someone else's cloud. AUTOMATIC GPS TRIP LOGGING • Start a trip and NaviLog records your route in the background — screen off, no internet needed • Distance in nautical miles or kilometers, duration, average and maximum speed • Smart GPS filtering removes outliers for clean, accurate tracks • Notes, weather and crew for every leg of your voyage • Engine hours counter per trip and per yacht ANCHOR ALARM (ANCHOR WATCH) • Physics-based swing circle calculated from chain length, water depth, bow height and boat length — not just a plain radius • Supports tide, mooring type and even a second anchor • Pre-alarm, GPS-loss alarm and low-battery warning • Adjust anchor position and chain length while the watch stays armed • Wind and swing history recorded for every anchorage MAN OVERBOARD (MOB) • One tap marks the position instantly and guides you back with live bearing and distance • Works with or without an active trip recording WEATHER & STORM ALARM • Marine weather and wind forecast for your current position (online) • Pressure-drop storm warning from your phone's built-in barometer — works completely offline, far from any coverage SEA CHARTS & OFFLINE MAPS • OpenSeaMap seamark overlay: buoys, lights, fairways on the map • Download chart regions before you cast off and review your tracks offline (Pro) FOR SKIPPER & CREW • Crew, skipper and yacht profiles, official crew lists • Checklists with templates (departure, safety briefing, engine check …) • Sea-miles certificates for licence training and charter proof EXPORT & BACKUP (PRO) • Complete logbook and sea-miles certificate as PDF • Tracks as GPX for OpenCPN, chart plotters and other apps • CSV import/export of trips, crew, yachts and anchor history MADE FOR NIGHT WATCHES • Night-watch mode in red-on-black to protect your night vision • Dark mode, fully localized in English and German PRIVACY FIRST • No account, no ads, no tracking of your behaviour • Your logbook data is stored only on your device • Optional online features (weather, place names, map tiles) contact their services only when you use them WHO IS NAVILOG FOR? Sailors, skippers, charter crews, motorboaters and liveaboards — for coastal cruising, blue-water passages, regattas, sailing school and logging licence miles. If you have ever asked for the best free sailing logbook app with an anchor alarm that works offline, this is it. NaviLog is free as a full logbook with GPS tracking, anchor alarm and MOB. A single one-time purchase unlocks Pro (PDF/GPX/CSV export, crew lists, templates, offline chart download) — no subscription, ever. Note: NaviLog is a logbook and an aid to good seamanship — it does not replace official navigation equipment or safe anchoring practice.