RaceChrono external GPS

Connecting G-Box to RaceChrono

G-Box captures GPS position and speed at 25 Hz and can send lap and speed data to RaceChrono by Wi-Fi for the fastest updates, or by Bluetooth when you want the simplest wireless setup.

Wi-Fi AP AILapTimer, AILapTimer002, or your module name

Wi-Fi data 192.168.4.1 : 10110

Bluetooth G-Box / RaceChrono DIY device

GPS rate Up to 25 updates per second

Wi-Fi Connection

Power on the GPS module and wait for its Wi-Fi network to appear. The name may be AILapTimer, AILapTimer002, or another name assigned to your specific device.
On the phone, connect to that Wi-Fi network. No password is required if the network is open.
Open RaceChrono.
Open Settings -> Add other device -> Add other device.
Select RaceChrono DIY.
Connection method: choose the Wi-Fi / TCP option.
If RaceChrono asks for the data type, choose its GPS data option.
Host/IP: 192.168.4.1.
Port: 10110.

Wi-Fi is the primary mode for the highest-rate 25 Hz GPS data link. Use it when you want the smoothest lap timing and speed trace.

Bluetooth Connection

Do not pair the GPS module in the phone's system Bluetooth menu beforehand.
Open RaceChrono.
Open Settings -> Add other device -> Add other device.
Select RaceChrono DIY.
In the Bluetooth device list, select your G-Box module.
If RaceChrono asks for the data type, select GPS / RaceChrono DIY GPS.

Bluetooth is convenient, but its update rate is usually lower than Wi-Fi. Use it when the simplest setup matters more than the fastest graph.

Checks and Common Issues

If RaceChrono connects but no satellites are available, move the GPS antenna closer to a window or outdoors and wait for a cold start.
If RaceChrono offers a system selection, try GPS-only mode, matching the module test setup.
If several modules are nearby, choose the one whose Wi-Fi or Bluetooth name you are connected to now.
Do not keep two modules with the same name nearby, otherwise the phone or RaceChrono may select the wrong device.