Every boat’s track,
replayed together.
Just put a phone on the boat and sail. Overlay the whole team’s tracks and see where the gaps opened, down to the loss on every tack.
First 3 sessions free · No extra hardware · Invites go out in sign-up order
The tracker is
everyone’s phone.
Put it in a waterproof case on the boat. No dedicated hardware, nothing to set up on the course. It keeps recording with the screen off and without signal.
One link.
Replay in the browser.
Every boat moves on the map on the same clock, with the leaderboard and the gap to the leader. No login needed, so you can send it straight to your coach and crew.
What went well.
What to fix.
Loss on every tack, port vs starboard, upwind angle and speed. Not just numbers: it tells you in words what went well and what to fix.
SailingTrack in 30 seconds.
You remember feeling slow. You rarely remember where. Your track does.
In a waterproof case,
on the boat
No data is used while recording. Phones without a SIM work too, and the session uploads automatically once it reaches Wi-Fi.
Choose the day's tuning before you launch and its values are saved with the session.
- Keeps recording with the screen off
- A timer for the start signal
- Hold to stop, so it never stops by accident
- Live sharing to a coach
Keeps recording with the screen off
Which tack,
and how much
For every tack and gybe, it compares where you would have been at your pre-turn speed with where you actually are. Habits show up as numbers, like losing nearly 20 m on every tack from port.
| Time | Tack | Loss | Min | Back |
|---|---|---|---|---|
| 10:03:12 | Port → Stbd | 21m | 1.4kt | 19s |
| 10:04:41 | Stbd → Port | 8m | 2.6kt | 11s |
| 10:06:05 | Port → Stbd | 19m | 1.5kt | 18s |
| 10:07:30 | Stbd → Port | 7m | 2.7kt | 10s |
| 10:09:02 | Port → Stbd | 17m | 1.6kt | 17s |
On starboard upwind you pointed 4° higher on average without losing speed
Tacks from port drop to 1.5 kt during the turn and take 8 s longer to recover
Also shows speed over time, port vs starboard and upwind and downwind angles. All analysis runs on the phoneNumbers are examples
Where the gap opened,
and why
Overlay the tracks of the boats you sailed with and follow the gap along the course, second by second. The gap is broken down into speed, angle and tacks.
What made up the 22 m gap to 3988Numbers are examples
- Upwind 1−22m
- Downwind 1+6m
- Upwind 2−9m
Replay the race
in a browser
Every boat is replayed on the map with positions and gaps. Share the link and coaches or parents can watch without the app.
Wind up
The wind direction is estimated from the upwind track and the map is turned wind-up.
Split at the marks
Positions and gaps for each upwind and downwind leg.
You control who sees it
Sessions are private by default. Others see them only through a share link or when you share them with your team.
Tuning and performance,
side by side
Manage tunings for each boat by wind range: side tension, forestay tension, mast bend, rake, mast step, spreaders, and any items you add.
Each session keeps the values you sailed with, so you can always check the setup from a fast day. Share it with your team and the whole club works from one sheet.
- Multiple boats
- Shared and edited with your team
- Works without a signal
- Side tension
- 26
- Forestay tension
- 300 kg
- Mast bend
- 55 mm
- Rake
- 6,520 mm
- Mast step
- 3,010 mm
- Spreaders
- 440 / 150 mm
Last edited by Coach · Nov 12
- CCoachOwner
- SSato4123
- TTakahashi3988
Also
Log
See your days on the water on a calendar, with distance sailed per month.
Live
Follow every boat's position and speed from the coach boat or ashore.
GPX and CSV import
Analyse tracks from GPS watches and instruments.
Start timer
Synced to the start signal and marked on the track.
Japanese and English
Follows your phone's language.
How it works
Put it on board
Choose the boat and tuning, start recording, and stow the phone in a waterproof case.
Sail
Sail as usual and stop recording when you come ashore.
Review
Analysis runs on the phone in moments. If you shared it with your team, the comparison with boats from the same day is there too.
Pricing
Your first 3 sessions are free with every feature. After that, choose monthly or yearly with no limit on sessions.
Your first 3 recordings. Recordings under 10 min do not count
- Recording and review
- Compare and replay
- Boats and tuning
Renews every month
- Unlimited recordings
- Everything in Free
- Cancel anytime
392 yen a month. 2 months free (saves 940 yen)
- Unlimited recordings
- Everything in Free
- Cancel anytime
- Recording
- Every 1 s. Continues with the screen off
- Speed
- GPS speed over ground, to 0.1 kt
- Connection
- Not needed on the water. Uploads automatically on Wi-Fi
- Devices
- Works on phones without a SIM. Sign in with Google to keep your sessions when you change phones
- Platforms
- iPhone (iOS 17 or later) and Android planned (coming soon)
- Team
- Share boats and tunings, comparisons and live positions
- Boats & teams
- Share boats and tunings within a team
- Import
- GPX and CSV (exports from watches and instruments)
- Languages
- Japanese and English
- Plans
- First 3 recordings free, then 470 yen/month or 4,700 yen/year
Questions
When can I use it?
We are getting ready to publish on the App Store and Google Play. If you want to try it first, request early access.
Can it measure wind?
No. A phone's GPS only knows speed and course over the ground. Angles are measured from the center line of your zigzag track (the axis you are sailing along). Where the current is strong, speed includes the current.
How accurate is it?
Phone GPS means a single tack can be off by a few meters. Averages and the port/starboard difference are more reliable than any one value.
How long does the battery last?
Save-and-upload mode uses no data, so the drain is modest. Live sharing or keeping the screen on uses more.
Can other people see my tracks?
By default, only you. Others see a session only through a share link or when you share it with your team. If you leave the team, they can no longer see it.
Who can see my tuning?
Tunings on your own boats are yours only. Make a boat a team boat and everyone in the team can see and edit it.
Does it cost anything?
Your first 3 recordings are free. After that it is 470 yen a month or 4,700 yen a year, and you can cancel anytime. Recordings under 10 minutes do not count.
Try it before
it hits the stores
We will email trial invitations in sign-up order. After you sign up, you get your place in line and a referral link. Each friend who joins moves you up.