Email jasperabundant@gmail.com. We reply within 1–2 business days.
No. Tide runs entirely on-device. Your coordinates are used locally to suggest nearby NOAA stations and to compute sun, moon, and solunar times. Nothing leaves your phone.
Tide runs a harmonic predictor that does not evaluate the Schureman node factor and equilibrium argument at run time; instead the bundled constants carry NOAA's published amplitudes and phases rotated into the app's epoch, with f and u folded in when the catalog is built. Measured against NOAA's own published high and low water at sixteen stations that were not used to prepare the data, half the tide turns land within 2 minutes and nine in ten within 6 minutes. Because f and u are fixed at the build epoch, the fit drifts slowly with the 18.6-year lunar nodal cycle, so the catalog is rebuilt periodically.
Not yet. Tide ships every NOAA CO-OPS station that publishes both harmonic constants and a tidal datum — 1,310 stations, 1,285 of them in the US and its territories. Stations NOAA predicts by offsets from a reference station, rather than by its own harmonic constants, are not included. If the water you fish is missing, email us and we will tell you the nearest station NOAA does publish.
Settings → Apple ID → Subscriptions → Tide → Cancel Subscription. You'll retain Pro / Pro+ features until the end of your current billing period.
Open Tide → Settings → Restore purchases. Or open the paywall and tap Restore.
No. Earlier builds shipped a Watch app and a widget that could never read your saved spot, so both were removed in 1.0.5 rather than left on the phone showing a permanent placeholder.