Four Dimensions (inc Time ?) - I had enough trouble with three !
Ah, it's an Area Radar thing, of course, and essential when interacting with civil ATC.
In the Joint Civ/Mil Ops room at LATCC, 'they' were doing everything with flight strips [with times] augmented by radar. So if I had Mil traffic crossing the mayhem of the SouthEast corner of the UK FIR, I needed at least a rough estimate for [say] crossing Red 1 at Clacton. Fortunately, the average Mil jet cruised at about the same speed, and conveniently [on our big flat-top radar displays] the standard chinagraph pencil represented about 5 minutes flying time ... et voila!
Images HERE at LWD24 and LWD25 ... and lots for me to read, having discovered that website!!
