anchor.diff:      addLayerToMap(markerClusterGroup)
   
       lastUpdatedAt = $.now()
  -    setTimeout((-> addMarkerLayer(markers, markerClusterGroup, lastUpdatedAt)), dataFetchDelay)
  +    setTimeout((-> addMarkerLayer(markers, markerClusterGroup, lastUpdatedAt)), dataPollDelay)
   
   @initializeMarkerForSession = (session) ->
     marker = L.marker(
  
positive.code:   @map.addLayer(layer)
    @activeLayer = layer
  
  @addSelectedOverLayerToMap = ->
    switch @selectedOverlay()
      when 'marker' then addMarkerLayer()
      when 'heat' then addHeatLayer()
  
negative.code:       heatLayer = L.heatLayer(heats, {radius: 20})
        addLayerToMap(heatLayer)
  
      setTimeout((-> addHeatLayer(heatLayer)), dataPollDelay)
  
  @sessionToHeat = (session) ->
    [session.spot.location.lat, session.spot.location.lng, session.number_of_jumps]
  