I always wanted to learn something like this! Embarrassingly... I never knew what it was called until today so I never found any books or videos on it. Learning what it is called and about an free course online course is awesome!
Good question. It used to require a membership (I think it's like $70/year); then there is a fee for the course on top. I believe now they have opened the courses up to the public.
There are two courses, actually. The first one focuses on sun sights- I've had that one. The second uses other stars. It's really for marine folks- so it includes a lot of navigation stuff.
