Raindrops 
                Observe real-time location events as raindrops on a map  
           The map will appear when the following prerequisites are met: 
          
            -  at least one point of interest has an associated position
            
 -  positions are in longitude/latitude format (ex: -73.57, 45.50)
            
 -  at least one device is detected at such a point of interest
            
 -  if Filter people only? is selected, the device must be one likely to be carried by a person
          
 
         
        
          Dashed ripple: appearance or keep-alive  
          Solid ripple: displacement  
          Blue: device likely carried by person  
          Orange: device with 'track' tag  
          
            Grey: other devices