Privacy policy — SeaCheck Mobile
This notice covers the SeaCheck mobile app (Android and iOS) — a standalone coastal navigation companion. It does not require Nextcloud or an account with Software by Design.
Last updated: 4 September 2026
Publisher
Software by Design GbRHusumer Baum 2
24837 Schleswig, Germany
Email: info@software-by-design.de
Privacy: datenschutz@software-by-design.de
General website privacy: software-by-design.de/datenschutz
This page is hosted on our documentation site and loads no analytics scripts. Cookie-free visitor statistics on other pages of this host are described in the website privacy notice.
1. Scope
Software by Design does not operate a central cloud that stores your passages, tracks, or GPS history. Your data stays on your device unless you export or share it yourself.
2. Data on your device
| Data | Purpose |
|---|---|
| GPS position | Chart, instruments, anchor alarms, tracks |
| Waypoints, passages, tracks | Planning and logging (SQLite) |
| Vessel details (optional) | Mayday text, default names |
| Offline chart packs | Charts without mobile signal |
| Settings | Preferences |
We do not upload your passages, tracks, or continuous location history to Software by Design servers.
3. Internet & third parties
When online, the app may contact third-party services (not Software by Design):
| Service | Data sent | Purpose |
|---|---|---|
| OpenStreetMap (tile.openstreetmap.org) | Map tile requests (area/zoom; no account) | Base map tiles |
| OpenSeaMap (tiles.openseamap.org) | Map tile requests | Seamark overlay tiles |
| OpenSeaMap GeoServer (geoserver.openseamap.org, depth.openseamap.org) | Optional WMS requests when you enable the depth overlay | Unofficial GEBCO / track-depth images (online only; not stored in offline packs) |
| OpenStreetMap Overpass API (e.g. overpass-api.de, overpass.kumi.systems) | Near-exact tapped coordinates (lat/lon) and a small search radius when you look up a chart object online | Online seamark / chart-object lookup when the local index has no match |
These requests can reveal which map areas you view (tile requests) and, for Overpass lookups, the approximate position you tapped. No account is required.
Offline: After you download a region pack on Wi‑Fi, chart tiles and seamark data for that area are stored on your device. The app can work without sending your GPS to any server.
4. What we do not do
- No sale of personal data
- No advertising or analytics SDKs in the app
- No profiling or marketing from your navigation data
5. Permissions
| Permission | Why |
|---|---|
| Location | Chart position, COG/SOG, optional background for anchor/tracks |
| Internet | Chart downloads and online seamark lookup |
| Notifications | Maritime alarms |
6. Deletion
Delete data in the app (passages, tracks, offline packs) or uninstall the app. Export GPX via the system share sheet when you choose.
7. Your rights (GDPR)
Contact datenschutz@software-by-design.de for questions about this mobile app.
8. Map attribution
See the terms & navigation notice and in-app Settings → About.