Privacy Policy
Last updated 2026-08-25
Overview
MARLOG is a maritime discovery, learning and reference app for coastal mariners. We respect your privacy and collect only what the app needs to work. This page explains what we collect, why, and what control you have.
This website
Everything below describes the MARLOG app. The website at marlog.app is a static site with no server and no database of its own, and it behaves differently. The contact form and the launch-list field do not transmit anything: they open a message in your own mail app, pre-filled with what you typed, which you then choose to send or discard — so nothing reaches us unless you send it yourself. If you arrive through a campaign link (a web address carrying utm_ parameters), the site keeps the campaign name and a click count in your own browser’s local storage; that never leaves your device. The site runs no advertising trackers. Visit measurement: where the site offers an analytics consent banner and you accept it, Google Analytics measures pages visited and approximate region, processed by Google per Google’s privacy policy; decline and nothing is loaded, no analytics cookies are set, and the site works identically. Email you send to support@marlog.app is received and stored by our mail provider in the ordinary way.
What we collect
Account info: your email address (required for sign-in) and an optional display name and home port. Location: your device GPS is read while the Home, Forecast and Atlas screens are open, so we can show the weather and the places near you, and to confirm you are within 200 metres of a place when you log a visit. Your last position is cached on your device so those screens can open without waiting for a new fix; if you set a home port, its coordinates are saved to your account so sea-condition alerts know where to check. We do not keep a continuous location history. Activity: visits you log, lessons you complete, flashcards you review, articles you save and badges you earn. AI conversations: messages you send to the in-app assistant are sent to Google’s Gemini API to generate replies, along with your approximate coordinates at the start of a conversation; we do not store a long-term archive of these messages.
What we do not collect
We do not collect payment details, contacts, your photo library, microphone audio (outside explicit voice features you enable), or any data from other apps on your device. There is no ad tracking in MARLOG.
Why we collect it
To sign you in, to verify visits at a place (the 200-metre proximity check), to power the discovery loop (badges, your map, your visit history), and to make Academy, News and the AI assistant work.
Purchases
The optional Supporter subscription is bought through Apple’s App Store and processed by RevenueCat, our purchase infrastructure. RevenueCat receives an anonymous app user ID and the purchase receipt — never your payment details, which stay with Apple. We store only whether your account has an active Supporter period.
Third parties
Supabase is our backend and stores your account, profile and activity data on EU servers. Apple Weather powers the in-app forecast — your coordinates go to our server, which requests data from Apple’s WeatherKit API on your behalf. MET Norway powers the server-side sea-condition alerts rather than the in-app forecast, and receives anonymous coordinates only. Copernicus Marine Service provides wave height, sea temperature and currents, and receives coordinates only. Google Gemini powers the AI assistant, processing your messages per Google’s privacy policy. BigDataCloud turns coordinates into a place name for the Home, Forecast and Atlas headers; it receives your approximate position and, as with any web request, your IP address. Sentry receives crash and error reports tied to a random identifier rather than your email, which may include the screen you were on and the coordinates or search text involved in the error. MapLibre, OpenFreeMap, OpenSeaMap and Esri serve map and satellite imagery through anonymous requests for the area you are viewing; the Home dashboard thumbnail asks Esri for a single image of a surrounding cell, with your position rounded to about 5 km first, so the request describes an area rather than your exact position. Apart from Supabase, none of these receive your account data.
Your rights
You can access, export or delete your data at any time. Use Settings → Delete account in the app to request deletion, or email us. Under GDPR and KVKK you also have the right to rectify inaccurate data and to lodge a complaint with your data protection authority.
Children
MARLOG is not directed at children under 13. We do not knowingly collect data from them.
Region
MARLOG is operated from Türkiye. We aim to handle data in line with Türkiye’s KVKK and the EU’s GDPR.
Changes
If we make significant changes to this policy, we will update the date above and notify you in the app the next time you open it.
Contact
Questions, requests or concerns: support@marlog.app