The Norden bomb sight would allegedly put a bomb into a pickle barrel from 30,000ft.
The problem was that it couldn't see through cloud so was useless in northern Europe for a good percentage of the time. Eventually the USAAF pragmatically did away with bomb aimers for most aircraft and they all just toggled as the leader dropped his
The RAF claimed that the American bombing would have been better if German factories had pickle barrels fixed to the roof.
@Chris Martyr Apologies.. I of course meant 'relatively easy' compared to the main force navigators trying to find their way over the more featureless areas of Germany not scattered with highly visible waypoints.
Rob P