[mars]

1) I knew this because that was beyond the WWII navigation technology
2) I knew this from the combact history of the night air war over UK
3) read chris goss's book "Luftwaffe Hit and Run Raiders: Nocturnal Fighter-Bomber Operations Over the Western Front, 1943-1945"

yes, after 1943 Luftwaffe ARE INFERIOR to allie airforces, and yes RAF night defense were invulnerable, at least to the Luftwaffe, and that was proved again and again from 1943 to 1945, what Luftwaffe achieved over UK in that period were nothing but isolated and occasional success, which were nothing but nuisance