In addition to getting the position once with getCurrentPosition(), you can use watchPosition() to register a callback that is called whenever the device reports a new position.

Usage:

navigator.geolocation.watchPosition(position => {
  console.log(position)
})

The browser will prompt for permission with this method too if it was not already granted.

To stop watching, call navigator.geolocation.clearWatch() with the id returned by watchPosition():

const id = navigator.geolocation.watchPosition(position => {
  console.log(position)
})

// Stop watching after 10 seconds
setTimeout(() => {
  navigator.geolocation.clearWatch(id)
}, 10 * 1000)

Lessons in this unit:

0:	Introduction
1:	Getting the user's position
2:	▶︎ Watching the position for changes
3:	If the user denies the position
4:	Adding more options