Exactly, I&#x27;m a geek, I don&#x27;t have practical uses for lots of things that I do.<p>I&#x27;ve got four of these &quot;ADS-B receivers&quot; (Raspberry Pi + SDR dongle + antenna) up and running in four different locations with a few more that still need to be set up and deployed.  I don&#x27;t have a practical use but it <i>is</i> pretty neat.<p>I considered trying to write my own stuff to do MLAT for aircraft without ADS-B transmitters after I get the others deployed but my math probably isn&#x27;t that good.<p>Another thought was to log all of the location data from all my receivers to a central database and do &quot;something&quot; with it, although I&#x27;ve yet to figure out what that &quot;something&quot; is&#x2F;would be.