Upload your track, re-live the race, learn from the fleet.

Windshift is non-profit, free for sailors to use and share. See how it works.

Recent races — click to play

Have data from your own races?

If you have AIS, you might see your boat here already, otherwise you can upload your own.

  1. 1

    Upload a log

  2. 2

    Link a track

  3. 3

    Share it, or not

1

Upload a log

Your own instrument data, or tracks from a phone, watch or handheld.

NMEA 0183

A text log from your instrument network, boat, speed, wind and AIS for tracks of other vessels in the race. This unlocks more functionality like true wind, VMG and polars.

  • RMC position, time, speed over ground
  • GGA position and time
  • VHW speed through water, heading
  • HDT true heading
  • MWV wind angle and speed, apparent or true
  • VWR relative wind, older loggers
  • XDR pitch and roll
  • AIVDM AIS — the rest of the fleet
Get it from:
  • OpenCPN — the VDR plugin, recording NMEA 0183
  • PredictWind DataHub — NMEA 0183 export
  • Any logger that writes a text file — one sentence per line
GPX

A track from a phone, a watch or a handheld, upload and join it with your friends tracks to complete the picture.

3

Share it, or not

Data you upload stays private if you prefer, and you can change your mind whenever you want.

Windshift is free and the data you put there is yours. It is a non-profit learning and sharing resource to help promote sailing in NZ and elsewhere.

The idea is to share the race with others you sail with, and for everyone to learn better tactics and a better understanding of wind and tide in your area.

  • Your tracks are either public or private, and you can change that any time
  • Shared track data includes GPS, wind, speed through water and heel angles
  • Performance info like race notes and polars is always private
  • Your email address is used to sign you in, nothing else
  • Nothing is sold, and nothing is shared with any third party
  • No advertising, and no tracking cookies

A lot of the data on Windshift comes from AIS, which is broadcast publicly — so you may see your own vessel in a race published by someone else.