Rebecca/Eureka, The prime, and only, navigation equipment fitted to the Linton JP3/5s in 1972. Very basic but taught one how to gain skills in Air Picture. Apart from being used for all ML Nav Exercises and GH above cloud it could also be used for IMC letdowns. It was possible to perform a Self Nav QGH with reasonable accuracy. Certainly better than being stuck above cloud without a clue. At Linton I'm sure that as a Stude we were allowed down to a MDH of about 1000ft, anyone remember?
Having mastered Rebecca/Eureka approaches an NDB approach was easy!