How can we help?

• An iPhone with iOS 16.4 or later, or an Android phone with Android 7 or later.
• A RaceBox Mini for lap timing.
• A mount that holds the phone sideways on your steering wheel.
• For your position and gaps: a track that publishes a live timing page, and mobile data on the phone.

1. Turn the RaceBox on and allow Bluetooth when the app asks.
2. Open Settings (the gear) and go to My RaceBox.
3. Tap Use next to your RaceBox. Its name ends with its serial number.

From then on the app connects to that RaceBox by itself and ignores any other nearby. Until you choose one, it connects to the strongest signal. A RaceBox can talk to only one app at a time, so close other lap timing apps first.

The app times a lap each time you cross a start/finish line that you set once: two points, one on each edge of the track, and the direction you drive.

1. In Settings, tap Choose a track, then New track.
2. Fill in the two ends of the line. Either paste each one from Google Maps (press and hold on the spot, then copy the two numbers, such as 50.0678, 14.4569), or stand at each edge of the track with your RaceBox and tap Use my position.
3. Check the direction arrow. If it points against the way you drive, tap Flip.
4. Tap Save track, then Select.

The line has to reach across the whole width of the track, and the two ends must be between 2 and 40 metres apart. A lap counts only when you cross in the right direction, above walking speed, and at least 15 seconds after the last crossing.

1. Open your track’s live timing page in a web browser. Its address ends with the track’s short name, for example …/kartplanet/.
2. Type that short name into the track field at the top of Settings.
3. On the dashboard, tap Pick your team and choose your team or kart number from the live list.

Your position and the gaps fill in once the track publishes the session. Pick your team again when your team name changes; the app remembers the team by name, because kart numbers change from race to race.

A session starts the first time you cross the line. It ends when you tap End session in History, when you choose a different track, or by itself after ten minutes without a crossing. Every lap is saved as you complete it, so nothing is lost if the app closes.

Your best lap of the current session, at the same point on the track. Green means you are ahead of it, red means you are behind. It shows dashes until you have finished one full lap. If your first lap included waiting on the grid, the delta looks too good until a faster lap takes its place.

The dashboard shows the reason next to the light. Check that the RaceBox is switched on and charged, that Bluetooth is on and allowed for the app, and that no other app is connected to it. The app reconnects by itself when the RaceBox comes back in range.

• The first crossing only starts the timer. Your first lap time appears after the second crossing.
• The direction may be the wrong way round. Edit the track and tap Flip.
• Make sure the right track is selected and its line reaches across the whole track.
• The RaceBox needs a GPS fix, which takes a minute or so outdoors after switching on.

Settings, under Lap timing, shows each crossing and why one was ignored (for example “missed the line” or “heading … off”).

• The timing page is empty until the track publishes a session, usually just before it starts.
• Check the short name you typed in Settings against the page’s address.
• Check that your phone has mobile data.

The app does not yet work with every timing system. If your track’s page never connects, email us its address.

The app has not found your team in the live list. Tap Pick your team and choose it again; team names often change between races.

On your phone, under History. The app keeps your latest 200 sessions. They are not sent to any server of ours. See the privacy policy.

On an iPhone, no: the app’s data is left out of iCloud and computer backups, so write down your track’s two line points before you switch. On Android, they come back when you reinstall the app if device backup was switched on in your phone’s settings.

No. A RaceBox connects to one app at a time, so this app takes the place of your other lap timer for the session.