P1: I've no Maritime background but, on the nav angle, insofar as it would have affected an ability to rendezvous, I am certainly aware of the Butt Report. Published in mid-1941, it demonstrated that, in general, only one in three Bomber Command aircraft was getting within 5 miles of a target plus a variety of other more dismal conclusions. For Bomber Command, a partial solution was the introduction of Gee - open to jamming - and I don't recall it as having any worthwhile coverage to the west of the UK when using its later versions in the mid-60s.