Hi Graeme. You're quite right, to a point. The series of Course Setting Bomb sites were, as you know, and can see from the manual's diagram, a drift indicator/computer arrangement. This provided the heading etc on which to fly to allow the desired trajectory and release pont for the pilot to fly. But the pilot still flew the aircraft, with directions from the bomb aimer. The later British Computing Bomb Site worked in a similar way to the Norden, in as much as, at a particular point, the bomb site itself was actually coupled to the aircraft's auto-pilot, so that adjustments made by the bomb aimer, or Bombardier in the USAAF, actually controlled the aircraft, without input from the pilot. Obviously, it's a lot more 'involved' than that, in both cases, and I'll admit I'm not fully conversant with the processes involved in the operation of drift or computing sites, but I'm sure you get my meaning.