MARLOG.From coastal waters to everything at sea.
An atlas of 1,160 charted maritime places — any coast on Earth — sailing-window meteorology, a seamanship academy, and an AI compass. Free on iOS.
Lay the route ruler across open water for distance, true bearing and passage time at six knots.
Apple Weather blended with Copernicus marine models — wind, swell period, sea state, and hourly sailing windows.
Sheltered anchorages, GEBCO depth contours, light characteristics, and port VHF channels.
Natural voice passage planning, COLREGS collision advice, and seamanship intelligence.
MARLOG. Everything a coastal mariner needs, in one instrument.
An atlas of 1,160 charted maritime places, a seamanship academy, marine forecasts with sailing windows, and an AI compass — the whole chart table in your pocket.
MARLOG. Everything a coastal mariner needs.
Atlas of 1,160 charted maritime places, seamanship academy, forecasts, and AI compass.
Atlas
The coast, charted.
MARLOG's Atlas charts 1,160 maritime places — 849 lights, 220 dive sites, 44 ports, 38 anchorages — on one dark map, and fills in any coastline on Earth on demand.
Academy
Seamanship, a few minutes a day.
MARLOG's Academy teaches seamanship through 16 courses, 106 lessons and 288 practice exercises, backed by a 471-term maritime dictionary that works offline.
Forecast
The sea, hour by hour.
MARLOG's Forecast reads wind, waves, sea temperature and current for any point at sea, pairing Apple Weather with Copernicus marine models as fine as 500 m.
Compass
Ask the sea anything.
MARLOG's Compass is a maritime AI assistant that answers weather, place and seamanship questions using live data for your position.
From the log.
Technical notes, passage planning analyses, and dispatches from the team building MARLOG.
Quick answers.
What is MARLOG?
MARLOG is an iOS app for coastal mariners: an atlas of 1,160 charted maritime places — the lights, dive sites, ports and anchorages a general map leaves out — marine forecasts with hourly sailing windows, a seamanship academy, and a position-aware AI assistant. Four surfaces in one instrument.
Is MARLOG free?
Yes. Every MARLOG feature is free — Compass, the AI assistant, with 5 questions a week on a free account and 2 as a guest. The optional Supporter subscription raises that to 30 a week and backs the work.
Which coasts does it cover?
Every coast on Earth. The coasts of Türkiye are charted in the greatest depth, and any other coastline fills in on demand as you explore it.
Can I navigate with it?
No — MARLOG is a discovery, learning and reference instrument, not a navigation system. Always carry official charts and use official sources for navigation decisions.
When does it launch?
MARLOG is in App Review now. Join the launch list at the bottom of this page and you will hear the moment it is live on the App Store.