Privacy.

Device location. When you open Tideglass, the app reads your watch’s GPS coordinates to determine which tide station is closest to you. This is the only data the app accesses.

We do NOT collect:

• Personal information (name, email, phone, address)
• Device identifiers (IDFA, IDFV, advertising IDs)
• Usage analytics or telemetry
• Crash reports (beyond what Apple provides automatically and anonymously)

On open: (1) the watch reports latitude/longitude; (2) Tideglass searches the bundled ~8,000-station database for the closest station; (3) it computes predictions from that station’s harmonic constants. All three steps happen entirely on the watch. No internet required, no data leaves the device.

Requests “Location When In Use.” Manage via: Watch app on iPhone → My Watch → Tideglass → Privacy & Security → Location Services. If denied, the app cannot find the nearest station and won’t display predictions.

None — no sharing because there is no collection. No third-party SDKs, analytics, crash reporting, ad networks, or tracking.

OpenWaters tide database (CC BY 4.0); algorithm adapted from Neaps (MIT); upstream NOAA (US public domain) and TICON-4 (CC BY 4.0).

Privacy questions: hello@panic-kit.com.