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I have to admit Navigation with out GPS, is a lot more fun, and rewarding.
Can be frustrating to start with, and is open to all sorts of calculation errors, but once your clear on all the details, and have done it for a few years, it's good fun.
Bang on Roughasguts. Navigation hardly changed from the days of Cook until radar came along then the Transit/GPS revolution of the late 70s saw an awful lot of knowledge thrown out.
If nothing else all boatowner shsould ave a basic knowledge in case the magic box has an unintended smoke release.
I have also found a similar, but not as exhaustive course provided by Qld dept. of Education. Some of the illustrations and examples seem a bit easier than the first course mentioned.