Annotate the track
SOG
STW
VMG
TWA
AWA
TWD
Dist
m
If you have AIS, you might see your boat here already, otherwise you can upload your own.
Your own instrument data, tracks a phone, watch or handheld.
Add your track to a race, see the whole fleet together.
Data you upload stays private if you prefer, change your mind when you want.
A plain text log straight off your instrument network. The more of these sentences it carries, the more the replay can show — position alone draws the track, and wind plus speed through water are what unlock true wind, VMG and polars.
RMC position, time, speed over groundGGA position and timeVHW speed through water, headingHDT true headingMWV wind angle and speed, apparent or trueVWR relative wind, older loggersXDR pitch and rollAIVDM AIS — the rest of the fleet
OpenCPN — the VDR plugin, recording NMEA 0183
PredictWind DataHub — NMEA 0183 export
A track from a phone, a watch or a handheld. Position and time only, so no wind or polar analysis — but enough to replay where the boat went, and enough to put your boat into a race someone else recorded in full.
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