Geograph - photograph every grid square

It is situated on the former Administrative/HQ site of RAF North Pickenham. The Operations block and a couple of sheds have survived here, albeit neglected and much overgrown. Concrete platforms mark the locations of some other buildings that once stood here.

Named after engineer Carl L Norden, who designed and developed the apparatus for US Naval aircraft, the Norden bombsight was one of the most important US military secrets of WW2, and crew members had to take an oath to protect its secrecy with their lives. It was a mechanical analog computer used for determining the exact moment bombs had to be dropped to accurately hit the target, and when properly aimed it could place a bomb inside a 31.4 metres (100 foot) circle from four miles 6,436 meters (4 miles) high.