Thank you Yellow Sun at post #48. That is a fascinating read on the V bomber Nav.
Several times in the 1960s I visited Lindholme as an ATC cadet and flew air experience on the Handley Page Hastings of RBS which had a nearly complete V Bomber kit installed in it, as several of you will remember. A 15 year old snot nosed kid from Doncaster was not considered an OPSEC concern so we were shown the full system whilst we radar bombed targets around Britain such as, I remember, "The North East Corner of the University Library of Aberystwyth." I was amazed at the target accuracy.
Meanwhile the Captain had a fist full of UK topographics in case the trainees down the back got him lost, which they never did.
In the spirit of the thread, in retirement flying my little Cessna with full Garmin, I still carry charts for the country.