Privacy policy
Last updated October 9, 2026.
Tidemark is made by Lunch Time Surf LLC, a California limited liability company based in Santa Cruz ("we"). This policy covers the Tidemark app for Wear OS.
What Tidemark stores
When you record a session, Tidemark saves the GPS track, the detected waves and the session totals on your watch. That data does not leave the watch. Uninstalling the app deletes it.
When you tap Save GPS track on a session, Tidemark copies that session to a file in the watch's Download folder, so you can copy it to a computer. Tidemark does not send the file anywhere, and it stays in the Download folder until you delete it.
Tidemark also remembers the spot you last picked, the spot you chose for each watch face complication slot, and the most recent forecast for each spot you viewed, on the watch. When you pick a spot by hand, it also remembers where the watch was at the time, so it can keep your pick until you move to a different beach. That position stays on the watch.
What Tidemark sends
To show conditions, the watch requests data for the selected spot:
- Tide predictions from NOAA at api.tidesandcurrents.noaa.gov, identified by the NOAA tide station for the spot.
- Wave, swell, water temperature and wind forecasts from Open-Meteo at open-meteo.com, identified by the spot's coordinates.
These requests carry the spot's fixed coordinates or station id, never your own GPS position. The spot is often the one you are standing at, though: when you open the app, Tidemark switches to the spot within 3 km of you. So a request for that spot tells NOAA and Open-Meteo roughly where you are. They receive it only to answer the request; Tidemark sends location to no one else, and keeps no copy of it off the watch.
NOAA and Open-Meteo also see your network's IP address, as with any web request. Their own privacy policies apply to what they receive.
Surfline links
When you tap a wave's cam timestamp, Tidemark asks your paired phone to open the spot's page on surfline.com. From there you are using Surfline's site or app under Surfline's terms and privacy policy. Tidemark does not sign in to Surfline, read your Surfline account, or send your sessions to Surfline.
Sending cam links
When you tap Send cam links on a session, Tidemark opens a page on this site on your phone. The session's summary and its Surfline links travel inside the link, after the #, which browsers do not send to any server, including this one. From there you choose whether and where to share it.
What Tidemark does not do
- No accounts.
- No analytics or tracking SDKs.
- No ads.
- No selling or sharing of your data.
Watch face and complications
Tidemark's complications, tile and Lineup watch face show the same spot forecasts as the app, fetched as described above. They never read your location. The complication spot picker sorts spots by distance from the last location fix the app took while you were using it.
Installing Tidemark on Wear OS 6 also installs the Lineup watch face, which is bundled inside the app. Tidemark switches your watch face to Lineup only when you tap Use Lineup and allow it.
Permissions
Location is used in two places, both on the watch. While a session records, the GPS track builds the session and detects waves. When you open the app, one location fix picks the spot you are standing at and sorts the spot list by distance. The fix itself is never sent; the spot it picks is, as described under What Tidemark sends. The fix is kept on the watch only when you pick a spot by hand, as described above. Notifications show the ongoing session so you can get back to it from the watch face.
Contact
Lunch Time Surf LLC, Santa Cruz, California. tacos@lunchtimesurf.com