anchor.diff:  
     $('#overlay-options input[name="overlay"]').change =>
       $('#overlay-options .overlay-option').toggleClass('selected')
  +    clearTimeout(@dataPollPromise)
       removeActiveLayerFromMap()
       addSelectedOverlayToMap()
   
  
positive.code:   @map.on 'popupclose', (e) -> setWindDate(new Date)
  
    # When requesting sessions, convert the timestamp from milliseconds to seconds
    $.get '/sessions', ({last_updated_at: (lastUpdatedAt / 1000).toFixed()} if lastUpdatedAt?), (sessions) ->
      for session in sessions
        markers.push(initializeMarkerForSession(session))
  
  
negative.code:   $('#wind-date').text(formatDate(date))
  
  @addHeatLayer = (heatLayer=null) ->
    $.get '/sessions', (sessions) =>
      heats = []
      for session in sessions
        heats.push sessionToHeat(session)
  