code: function pointSender(lat, lng) {
        /**
         * Sends the point, then calls the callback after a delay
         * @param {function} callback Called when complete
         */
        return function(callback) {
          console.log('Visiting point ' + lat/COORD_FACTOR + ', ' +
              lng/COORD_FACTOR);
          call.write({
            latitude: lat,
            longitude: lng
          });
          _.delay(callback, _.random(500, 1500));
        };
      }
docs: Constructs a function that asynchronously sends the given point and then
  delays sending its callback
  @param {number} lat The latitude to send
  @param {number} lng The longitude to send
  @return {function(function)} The function that sends the point