Para el hackaton de tizen

location-distance.js

distance: function(coords) {
  var barPos = this.get("location"),
      R = 6371*1000,
      dtr = Math.PI / 180,
      lat1 = coords.latitude*dtr, lon1 = coords.longitude*dtr,
      lat2 = barPos.latitude*dtr, lon2 = barPos.longitude*dtr,
      x = (lon2-lon1) * Math.cos((lat1+lat2)/2),
      y = (lat2-lat1),
      d = Math.sqrt(x*x + y*y) * R;

maps.js

  var co = this.model.get("location");
  var mapOptions = {
    zoom: 18,
    center: new google.maps.LatLng(co.latitude, co.longitude),
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    disableDefaultUI: true
  };
  this.map = new google.maps.Map(this.$("#map").get(0), mapOptions);
  new google.maps.Marker({
    map: this.map,
    draggable: false,
    animation: google.maps.Animation.DROP,
    position: new google.maps.LatLng(co.latitude, co.longitude),
  });
  this.ui.money.val(this.model.get("money") || 5);
},