Guides

Track day telemetry guides

How to get data off your logger, line it up with your onboard video, and understand what the numbers on screen actually mean.

• How to add a telemetry overlay to track day videoStep-by-step guide to putting speed, G-force and lap times onto your onboard track video, for free and without installing anything. Works with RaceChrono, VBOX, Dragy and GoPro.
• How to export a .vbo from RaceChronoExport a RaceChrono session as a VBox .vbo file: the exact menu path, which Scope option to pick, why Pro is required, and what the video sync points in the header are for.
• How to sync GPS data with onboard videoAligning telemetry to track footage is the step that makes or breaks an overlay. How to use the audio waveform against the speed trace, why clock timestamps are unreliable, and how to fix drift.
• What is a .vbo file?A .vbo file is Racelogic's plain-text GPS logging format, used by VBOX, RaceChrono and Dragy. What is inside one, what each column means, and the two sign conventions that catch people out.
• Lap delta explainedLap delta shows how far ahead or behind your reference lap you are at every point on track. What it measures, why it is more useful than a lap time, and how to read it without being misled.