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Your GoPro is a data logger
If a GoPro was on the kart, the data already exists. GPS-enabled models write position and speed into every video file — the footage you shot for the group chat is also a session.
Which GoPros
HERO 5 through HERO 11 record GPS — roughly 10 to 18 position samples a second depending on the model. HERO 12 dropped GPS entirely, so there's no data to read from that generation. If your camera's settings show a GPS toggle, you're set.
Before the session
Turn GPS on in the camera's preferences, and give the camera a clear view of the sky for a minute before you roll out — a settled GPS lock at the start beats one acquired mid-lap. Then record like you always do.
After the session
Load the .mp4 (or .mov) into LapperSnapper. The telemetry is read straight out of the video file — no camera connection, no export step, the file is the transfer. Laps, sectors, and corners are detected from the GPS, the same as any logger.
The part only video can do
Because the data and the footage are the same file, playback comes with the telemetry overlaid — speed, delta, the map — and any lap can be exported as a clip with the overlay burned in and the audio kept. Proof you can share.
If no data shows up
GPS was probably off for that recording, or the camera is a model without it. The video still plays — there's just nothing to time. Turn the toggle on and the next session logs itself.