GeoLoc01 js

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 50, lng: -1},
    zoom: 3
  });
  var infoWindow = new google.maps.InfoWindow({map: map});

  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position) {
      var pos = {
        lat: position.coords.latitude,
        lng: position.coords.longitude
      };

      infoWindow.setPosition(pos);
      infoWindow.setContent('Location found: (lat/long): [' + roundToNPlaces(pos.lat,1) + '][' + roundToNPlaces(pos.lng,1) + ']');
      map.setCenter(pos);
    }, function() {
      handleLocationError(true, infoWindow, map.getCenter());
    });
  } else {
    // Browser doesn't support Geolocation
    handleLocationError(false, infoWindow, map.getCenter());
  }
}

function handleLocationError(browserHasGeolocation, infoWindow, pos) {
  infoWindow.setPosition(pos);
  infoWindow.setContent(browserHasGeolocation ?
                        'Error: The Geolocation service failed.' :
                        'Error: Your browser doesn\'t support geolocation.');
}

// Utility functions
//----------------------
// Round (a float) to the required number of decimal places.
 // This is to compensate for js only rounding to whole integers
 // just used for my case - not tested outside that need
 function roundToNPlaces(numberToRound, decimalPlaces) {
   var placesConvenience = Math.pow(10, decimalPlaces);
   return (Math.round(numberToRound * placesConvenience))/placesConvenience;
 }