Fleet Analysis (tuning build 5)
Data Analytics
Velocitek Control Center file: this is an older GPS-only unit, so there's no compass or heel sensor behind it — heading is course over ground and heel isn't available. There's no start line or start gun in this format either, which is what the Training Session Analysis is for.

Race

J24 Nationals 2026 Day 1, Race 3 — three boats, three devices, one race.

Manually cut the race off at a finish time — anything logged after it is ignored for both boats, everywhere below.

Summary

Vakaros VKXVelocitek VTKVelocitek VCC

Wind

Wind used by every boat: estimated

Both boats always use the same wind — recorded wind is preferred over an estimate, and if only one file has a recorded reading, that's used for both. Applying it here (or overriding it manually) recomputes VMG, tack/gybe detection, wind-angle legs and the polar overlay for both boats at once.

Vakaros VKX's 11 tacks (96° apart) put it at 166°, and Velocitek VTK's 10 tacks (83° apart) put it at 169°, and Velocitek VCC's 11 tacks (100° apart) put it at 158°. All 3 agree to within 6°, which is good corroboration. That agrees with the direction in use, so nothing needs changing.

Which wind to analyse against

Every boat sailing a settled straight line is a wind vane: its heading sits half its own tacking angle to one side of the wind (half its gybing angle either side of dead downwind). Turns, and the seconds either side of them, are left out, and the whole fleet's readings are averaged. Live is the default — a fleet of wind vanes is the best reading of the breeze anyone here has — so switch to fixed to use one direction throughout.

The breeze averaged 156° and moved through 22°, 12° left and 10° right of that. Read off 3 boats. The boats agreed to within about 5° of each other.

The wind through the race

The race averaged 156°. Above the centre line the breeze was right of that, below it left — so a run of shading on one side is a persistent shift, and the ticks along the bottom are where you tacked and gybed.

136°146°156°166°176°race average 156°T+10:00T+20:00T+30:00T+40:00

Wind directionSpread between the boatsYour tacksYour gybes

Track comparison

Includes the start line (from each instrument's logged pin/boat-end position, averaged if both have one) so the approach to the start is visible alongside the rest of the track.

Scroll to zoom · drag to pan

Speed & VMG

Start analysis

Each boat's position relative to the start line at the gun, and how it crossed it — based on the start line position logged by each instrument.

Start line bias

Wind-up view of the (averaged) start line — which end was favoured, and how much of that advantage each boat actually used from where it started.

Race sequence

Every leg, its straight-line-only equivalent (manoeuvres filtered out of the numbers), and the mark rounding into the next leg — in race order. Legs are matched between boats by the most overlapping race time; a mark rounding only appears where both boats have a clean, contiguous leg boundary to measure it from.

Manoeuvre efficiency

Tack analysis

Each boat's best (highest made-good) tack of the race, compared head to head.

Gybe analysis

Each boat's best (highest made-good) gybe of the race, compared head to head.

Polar overlay

Sail Smarter Race Analytics is an independent project. Not affiliated with, endorsed by, or connected to Vakaros or Velocitek — those names, and the VKX and VTK file formats, are referred to only to describe compatibility. All trade marks are the property of their respective owners.