OK, I'll nibble at acouple of points (and I don't buy the SF theory over Roland BTW)
The idea of the aircraft commander altering his "pop up"...well frankly the airship weren't there and unlike the Soviet Air Force, RAF aircraft Commanders were not tied to what the "airships" said...
Re Nav accuracy - this has come up before -
AFAIK Astro won't work to the required degree of accuracy if the aircraft is subject to frequent heading/speed changes..le.g in/following a formation. Inertial Nav will, hence the fitting of INS to the aircraft, no need for GPS. What's the mystery?