Good old BBC Master allowed me to create all the AAR rendezvous data for the RAF (and NATO) 23 years ago, having taught myself how to convert trigonometry into BBC Basic. I still have the 'Parrot double sided double density soft sector 96 T.P.I. unformatted' 5" floppy disk, but nothing on which to run it!
Of course an ever-generous MoD paid me the grand sum of £0.00 for my work - which is still in use today!