Blimy BEagle, I remeber that diagram. Was the blue box on the left the oven? The most essential piece of equipment on an RAF tanker!
And as for GPS set being as common as mobile phones, Mrs W actually has a GPS built into her mobile phone!
No GPS could ever cope with the magic roundabout! Reminds me of the true tale of the American exchange officer who on his first excursions onto the British roads happened across the said roundabout. After going round three times, he decided he couldn't get out of it, parked his car in the middle and waited for the police to arrive!