海外大人気 ドローンタイミングシステム
https://www.pidflight.com/pidflight-lap/
https://www.pidflight.com/download/303/
PIDflight Lap is a VTx lap timing solution for individual pilots and multi-pilot support for race meets of up to 8 pilots.
The PIDflight Lap Timing device utilises the signal strength of the video transmitter (VTx) installed on an FPV enabled multirotor as the timing mechanism for counting laps.