anchor.diff:  var soundTrekIcon = {
     url: "<%= asset_path('sound_trek_marker.png') %>",
     scaledSize: new google.maps.Size(30, 30)
  +}
  +
  +function createUserRadius(map, position) {
  +  var userRadius = new google.maps.Circle({
  +    map: map,
  +    radius: 500, // could be made toggleable
  +    center: {lat: position.coords.latitude, lng: position.coords.longitude},
  +    strokeColor: '#1dbdd6',
  +    strokeOpacity: 0.5,
  +    strokeWeight: 0.5,
  +    fillColor: '#1dbdd6',
  +    fillOpacity: 0.15
  +  })
   }
   
   var map,
  
positive.code:   map = new google.maps.Map(document.getElementById('map'), {
      zoom: 15,
      center: mapCenter,
      draggable: false,
      zoom: 15,
      minZoom: 15,
      streetViewControl: false,
      clickableIcons: false
    });
  }
  
  
negative.code: }
  
  // current position of the user
  function setCurrentPosition(position) {
    currentPositionMarker = new google.maps.Marker({
      map: map,
      position: new google.maps.LatLng(
          position.coords.latitude,
          position.coords.longitude
      ),
      icon: userIcon,
      title: "Current Position"
    });
    map.panTo(new google.maps.LatLng(
        position.coords.latitude,
        position.coords.longitude
    ));
    createUserRadius(map, position);
  }
  
  function enableSoundTrekFunctions(position) {
  