Does anyone here know that the"CRP" in CRP5 or CRP1 stands for "Computer Robert Pooley"?
It is an entrepreneurial and commercial adaptation of the original RAF Dalton navigation computer (the aluminium one which does not warp in sunshine). Both are simply analogue slide rulers.
May I assure you that the questions in the JAA question bank allow for production errors/tolerances in all navigation computers so that, providing you use correct techniques, there is no way that you can derive an incorrect answer.
Since this is my profession, I just thought I would mention it.......
...and long live the Flight Management Computer! This is free of charge and comes ready-installed in your jet.