speed, measured properly
Every category the speedsurfing community actually uses: 2-second peak, best 10 seconds, 5×10s average, 100 m through 10 km, nautical mile, alpha 500, 30-minute and 1-hour averages — plus any custom distance you add, applied retroactively to sessions you already recorded.
Speeds come from the receiver's Doppler measurement and are computed on the continuous track, not snapped to the nearest GPS fix — because one second of slop is ten metres at twenty knots.
runs, unstacked
An hour of winging in a bay is forty passes through the same water — drawn as one line, it's unreadable. The Runs view drops the map entirely: one lane per run, stacked in time, so nothing overlaps. Your session reads top to bottom like a score.
Session replay
watch it back
Replay the whole session with a playhead, speed heatmap and live readout — and see exactly where every flight, gybe and fall happened.
angles, gybes and time on foil
Wind direction worked out from your own track — no weather service, no internet.
Polar curve, VMG upwind and downwind, tacking and gybing angles.
Gybes and tacks detected and scored: entry speed, minimum speed, recovery time, and whether you stayed on the foil.
Time on foil, number of flights, longest flight, takeoff speed.
Port versus starboard comparison — see the side you've been quietly avoiding.
For downwinders: glides detected from the pump-and-glide rhythm, longest glide, link rate and swell period.
your record book
record on your watch or your phone
Start a session in one tap. The Apple Watch app runs standalone — it doesn't need your phone nearby, or even installed.
Built for the water
Water Lock engages automatically, and the session keeps recording with the screen off and your wrist down. Seven live screens: speed, splits, totals, wind angles, foil time, controls, and a racing start countdown.
Crash-safe recording
Your track is written to disk continuously, so a flat battery or a crash costs you seconds, not your session.
Honest numbers
Every session is graded for GPS quality. Detected gybes and jumps carry a confidence score, and the raw samples are always kept so you can check anything.
Privacy
your data is yours
Import anything
GPX, TCX, FIT and CSV — bring your history from Garmin, Coros, Suunto and most other apps.
Export everything
GPX, TCX, CSV, GeoJSON, or a complete lossless archive. Sharing trims the start and end of your track by default — those are usually your car or your home.
No account, no server
No sign-up, no tracking, no analytics in the app. Nothing leaves your device unless you send it. The complete source — including every analysis algorithm — is public on GitHub.
find your next spot
The OpenWater Foil Spot Guide maps 960 foiling launches across 116 countries — with conditions, launch access, wind meters, webcams, tides and local guides for every spot, from the Gorge to the Med.
Browse the Spot Guide