anchor.diff:        heatLayer = L.heatLayer(heats, {radius: 20})
         addLayerToMap(heatLayer)
   
  -    setTimeout((-> addHeatLayer(heatLayer)), dataPollDelay)
  +    @dataPollPromise = setTimeout((-> addHeatLayer(heatLayer)), dataPollDelay)
   
   @sessionToHeat = (session) ->
     [session.spot.location.lat, session.spot.location.lng, session.number_of_jumps]
  
positive.code:     addLayerToMap(markerClusterGroup)
  
      lastUpdatedAt = $.now()
      setTimeout((-> addMarkerLayer(markers, markerClusterGroup, lastUpdatedAt)), dataPollDelay)
  
  @initializeMarkerForSession = (session) ->
    marker = L.marker(
  
negative.code: 
    $('#overlay-options input[name="overlay"]').change =>
      $('#overlay-options .overlay-option').toggleClass('selected')
      clearTimeout(@dataPollPromise)
      removeActiveLayerFromMap()
      addSelectedOverlayToMap()
  
  