anchor.diff:  
           var key = "bibs"; // defined in _header.html.erb
           var selected_racers = JSON.parse(localStorage.getItem(key)); // view _header to see how bibs are stored
  -        var racer_markers = [];
  +        var racer_markers = []; // array of markers that are displayed on map
   
           // initialize markers for selected racers so locations can be updated
           var n;
  
positive.code:                 url: "welcome/updated_coords",
                  success: plotCoords // callback handler
              });
  
              setTimeout(updateCoords, 7000);
          }
  
          updateCoords();
  
negative.code:                 racer_marker.bindPopup("Racer: " + current_racer.bib + ", Time: " + current_racer.time);
                  racer_marker.setOpacity(1);
              }
  
              console.log(localStorage.getItem(key));
          }
  
          function updateCoords() {
  