Code snippet of tutorial: Build a running tracker

tracker.js

const startTracking = () => {
  if(!navigator.geolocation) {
    logConsole.textContent = 'Geolocation is not supported by your browser';
  } else {
    logConsole.textContent = 'Locating ...';
    distanceBox.textContent = '0.000';

    return navigator.geolocation.watchPosition(success, error, trackOptions);
  }
}