NWSRG,
Good question, now that you mention it...
I'll see what I can find out.
It wasn't paper, but some kind of backlit mylar film, IIRC.
For the mechanism, think those multiple advertising panels, where the posters are rolled up above and below the window.
The edges of the film maps would have been coded, so the display "knew" where it was.
If you wandered off the map sideways, it would go whirr-whizz to find the corresponding map on the roll.
By the time Concorde came along, they used a microfilm projector type device. Ferranti, I think. I witnessed a live demo in a LandRover around 1966, IIRC, and something like it was used in a James Bond film.
The Concorde one didn't last long..... who needs a map reader in the middle of the Atlantic?
SOPS,
I think you could get quite a lot of maps onto the thin Mylar film cassettes used, like most of Europe (Trident being somewhat short-range). They probably had cassettes for each route....
Same with the microfilm cassettes in the later projector-type displays.
Not too sure where the position data came from in those days without GPS.
Decca, possibly, for the Trident.. I don't think it already had an INS.
Ancient avionics engineer this end, not necessarily fully informed. But always curious. Anybody else for a trip down memory lane in the '60s?
PS A Trident survived almost complete... 'ZK.
And another forward fuselage survived, converted to a sim.
I'm sure the truth is out here....