Moto Lap is the lap-timing add-on for Chainline / Dragy Moto Lab. A Dragy Pro gives it a fast GPS stream for laps and passes.
On the live board, set the source to Dragy Pro · Bluetooth and arm the timer.
Android: use the Moto Lap Android app (download motolap.apk) or Chrome or Edge. Desktop Chrome and Edge also pair directly.
Close the official Dragy app first. The Pro talks to one phone at a time.
Moto Lap reads the GPS stream, times the lap, and keeps the session in this browser or app.
iPhone: the browser can't open Bluetooth. Record in the Dragy or Dragy Lap app, export GPX, CSV or decrypted JSON, and import it on the Moto Lab page. Encrypted Dragy files stay in the official app.