Works with

Dragy video overlay

Dragy's app can export a session as a .vbo file, and TrackHero reads that format natively. Load the export alongside your onboard video in desktop Chrome, align them, and export an MP4 with speed, G-force and lap-delta gauges rendered into the footage. Free, no install, nothing uploaded.

From a performance meter to a finished video

Dragy made its name as a GPS performance meter, doing 0 to 60 runs, quarter miles and roll races, and dragy·Lap extends the same hardware to circuit lap timing. What the app does not do is give you a shareable video with the numbers drawn into the picture.

That is a rendering job, and it is what TrackHero is for. Export the session as a .vbo, pair it with your onboard footage, and you get speed, G-force and lap deltas burned into an MP4.

Sample rates by unit

Which Dragy you own affects how smooth the result looks:

Unit	Rate
DRG69	10 Hz
DRG70 / DRG70-C	25 Hz
Dragy Pro	25 Hz

At 25 Hz the speed needle moves convincingly in real time. At 10 Hz TrackHero interpolates between samples against the video timeline, which looks fine at normal playback speed but is more visible in slow motion.

Why VBO matters here

Dragy exporting to .vbo is what makes this work at all. VBO is Racelogic’s format, and it has become the common interchange language for track-day data. RaceChrono exports it, VBOX units write it natively, and analysis tools read it. Because TrackHero parses VBO directly, a Dragy session needs no conversion.

If you want to know what is actually inside one of these files, see what a .vbo file is.

Drag runs versus circuit sessions

The speed gauge and G-force plot behave identically whether you are on a circuit or a runway. The lap-specific elements, the live delta and the lap overview, need multiple laps to compare against, so on a straight-line run they simply do not appear. Nothing breaks; the overlay just shows what it has data for.

Requirements

Desktop Chrome. Free, no account, no watermark, and no upload: everything is parsed, composited and encoded on your own machine.

Last updated 2026-08-28.

Frequently asked questions

How do I get a .vbo out of Dragy?

Export the session from the Dragy or dragy·Lap app in VBO form. It is the same format Racelogic uses, and it is the interchange format most track-day analysis tools accept.

What sample rate does Dragy record at?

It depends on the unit. The DRG69 logs at 10 Hz, while the DRG70, DRG70-C and Dragy Pro log at 25 Hz. A higher rate gives a smoother speed trace and a more precise overlay, though TrackHero interpolates against the video timeline in either case.

Dragy is a drag meter. Does it work for circuit laps?

Yes. Dragy built its reputation on acceleration runs, and dragy·Lap extends the same hardware to circuit lap timing. Once the session is exported as a .vbo, TrackHero treats it like any other GPS log.

Can I use this for a drag run rather than a track session?

Yes, though the overlay is built around circuit work. The speed gauge and G-force plot work exactly the same on a straight-line run, but lap delta and the lap overview need multiple laps to have anything to compare, so they will not appear.