Problem is you'd have to be able to send the text upside down as well, if we're travelling north to south Mrs
js reads the map upside down!.... why do wimmin do that? (that might need a jetblast thread though!). The MOD could also make money selling the same info to spotters,binka's etc....
PN could you ask them this weeks winning numbers too? ta!..
Seriously though regarding height estimation, I used to be quite good at it, it needed to be a type I was familiar with and in a location I knew in relation to the flight paths. I would regularly beat the complainant with the estimate, frequently by hundreds of feet!, maybe your atco used the same trick!