Current Coach

Drop a drifter in the water and ping twice for tidal current speed, direction, and a confidence score in seconds. Heat-map mode interpolates the full vector field.

Current Coach turns your iPhone into a precision tidal current meter for sailors, racers, and cruisers. Drop your phone into a waterproof drifter, let it move with the water for 30–60 seconds, and get the speed and direction of the current in real time.

Whether you're calling the first shift off the pin, staying out of a foul current at the layline, or understanding why the boat felt slower on port tack — Current Coach gives you the data instead of the guess.

KEY FEATURES

• PRECISION MEASUREMENT GPS-driven drift readings with start-to-end displacement. Every measurement shows speed in knots and m/min, direction in degrees, duration, and a confidence score combining GPS quality, recording length, and drift distance.

• GPS SIGNAL SCOPE Before you hit Start, a radar-style scope shows live GPS accuracy — color-coded green/blue/amber/coral so you know whether the first ping will be good enough to anchor the reading.

• HEAT-MAP VECTOR FIELD
Toggle heat-map mode on the map and Current Coach interpolates a full vector field of currents across your race area from the readings you've collected. Lookback adjustable 1–24 hours. Confidence fade shows where the extrapolation is strong vs. weak.

• HISTORICAL REVIEW Tap any recorded measurement to jump to the map with a ±12 hour window focused on that moment. Retrace a tack. Compare morning practice to the afternoon race. See how the current evolved.

• M2X CLOUD SYNC (OPTIONAL)
Sign in with an m2xsailing.com account to sync measurements to the cloud. View them in the web File Library, share with teammates, or disconnect any time. All core features work offline without signing in.

• DESIGNED FOR THE HELM Dark palette, large numeric read-outs, readable under sunlight. Portrait-locked. Recording continues while the phone is pocketed. No ads, no subscription, no in-app purchases.

Built for sailors who need the answer, not a guess.