Privacy: nothing leaves your phone

The app has a Privacy page in Settings that says it all. Here is the whole story anyway:

• No account, no sign-in, no backend. There is nowhere to send your data and no code that could.
• Your GPS position never leaves the device. It is used to draw the chart, evaluate warnings and record your trips, all on the phone. In the background (phone locked, another app open) location keeps running only while a trip is recording: Android shows a notification for it, iPhone the blue pill in the status bar.
• The camera is used only when you take a trip photo. Photos stay with the trip, on the phone.
• Trips, routes, marks, ratings, settings: everything you create is stored only in the app’s local database on your phone.
• No analytics, no advertising, no trackers, no crash reporters that phone home.
• The “Diagnostic log” in Settings is off unless you switch it on. It writes navigation events (positions included) to a file on the phone and sends it nowhere. Only “Export log” hands the file to your phone’s share sheet, for when we ask for it to chase a bug.
• The chart is inside the app, so it is never downloaded.
• What the app downloads on its own: a small configuration file from bluedolphin.bombadil.hr at launch (bridge opening times and tuning values), and the DHMZ marine forecast, fetched at launch and refreshed every few hours while the app is open. Both are ordinary anonymous downloads: no personal data, no location. The app works fine offline without them.
• “Weather” in the ring menu opens windy.com in your browser for the point you tapped. That point goes to Windy in the web address, and only then. “How to use” opens this guide, and the email buttons open your own mail app. Nothing is sent until you press send there.

In full disclosure: because there is no cloud, there is no backup yet. If you delete the app (or lose the phone), your trips, routes and marks are gone with it. Accounts and sync may come later. Until then, treat the phone as the only copy.

The formal version, the one the app stores link to: Privacy policy.