Race Navigator

For each boat: how far behind you they can finish and still tie you on corrected time - any closer and they beat you (+ you give them time), or how far ahead of you they must finish (− they give you time). Columns are your elapsed race time.

Course planner

Pick the course from the morning briefing, then enter the forecast wind. Legs are classified Beat / Fetch / Reach / Broad reach / Run, and beat/run legs get VMG-adjusted sailing distance.

Race log - estimate vs actual

Elapsed 0:00:00
AIS setup (aisstream.io)
Not connected

Free key at aisstream.io. Add each boat's MMSI below to auto-track distance. Your own position comes from this phone's GPS. Without AIS, just type distances in manually. On a phone, rotate to landscape to edit MMSIs.

Distance + ahead/astern gives a time gap at fleet speed. Combined with the handicap owed at the current elapsed time: if the race finished now, this is where you'd sit on corrected time. + owed: they can finish that far behind you; − owed: they must be that far ahead.