Your boat's instruments, on the phone in your hand
SailStats reads NMEA 0183 data over your boat's Wi-Fi and shows it on a dashboard you build yourself — wind, depth, boat speed, heading, VMG. It records every sail with the full instrument history, times your starts, and replays a whole fleet on one map afterwards. Free, iPhone and iPad, no account needed.
Download on the App StoreFree. iPhone and iPad, iOS 17 or later. Apple Watch companion included.
Start here
Three things, in order. The first one needs nothing but the app — or read the first-sail guide.
Download it and go sailing
It works on your device's own GPS, with no hardware at all — track, speed over ground, course, and start-line timing. You don't need instruments to get something useful out of the first sail.
Check what your plotter can do
B&G, Simrad and Lowrance displays usually stream NMEA straight over Wi-Fi. Garmin and Raymarine need a small gateway on the instrument network. See which chartplotters and gateways work, and how to set each one up — or, if you sail behind a B&G, start here.
Build the dashboard you actually want
Pick from more than twenty data channels, size the tiles, and keep a different layout for racing than for a delivery. Nothing is fixed in place.
Works with the instruments you already have
SailStats is a listener. It reads the NMEA 0183 stream your boat is already producing and changes nothing on the network — your plotter carries on working exactly as it does now.
Eighteen sentence types are parsed, covering wind, depth, boat speed through the water, heading, water temperature, rudder angle and waypoint navigation. Where the standard offers both, the magnetic field is preferred, so bearings agree with the compass you're steering to rather than disagreeing by the local variation.
The last five minutes before the gun
A start-line timer built for the part of the race that's actually hard. Ping both ends of the line from the boat, drop them on a map, or type the coordinates.
- Distance and time to the line, continuously
- Time to burn — how early or late you are at your current speed
- Line bias against the wind, and against the first mark, so you know which end pays
Three start screens — a planning board, a numbers view and a line visualisation — so you can swipe to whichever one you read fastest with thirty seconds to go.
Every sail, kept
Recording keeps going with the screen off, so your track has no holes in it. Afterwards you get the whole sail back: scrub through it on a map with your instrument data replayed beside you.
Course performance gives you time, average and maximum speed, your best ten-second burst and your best sustained mile or kilometre. Speeds are spike-filtered, so a single bad GPS fix can't set a record it didn't earn. With real wind data you also get the point-of-sail breakdown — how you actually went upwind, reaching and downwind.
The whole fleet on one map
Share a race with a join code. Everyone records their own sail and uploads the track afterwards, and the fleet replays together — who went where, who gained on which leg, and how the leaders' first beat differed from yours.
Time-trial mode does the same thing across days rather than boats, comparing runs recorded on different dates against the same course. Useful when the only boat you have to race is your own.
Find any sail again
Search, date and tag filters across everything you've recorded, with a summary header for whatever you've filtered to — distance, time, sailing days, maximum and average. Tag a session by boat, by sail wardrobe, or by series.
Units are yours: knots, km/h or mph; nautical miles, kilometres or miles. Everything is stored canonically and converted only for display, so switching never rewrites your history.
Also on your wrist
An Apple Watch companion comes with it: the numbers that matter, the start countdown, and pages you choose yourself.
Download on the App StoreFree. iPhone and iPad, iOS 17 or later. No ads, and your sails stay on your device unless you share a race. Privacy.