NavList:

I'd really like to see something like this. Honestly just having computer generated navigation quizzes would be great, and it would be much more interesting if quizzes built on the progression of travel from your previous quizzes so you could do a 'voyage'. Kind of like "Hawaii by Sextant", except generated on the fly each time you play.

It'd be neat if you had an ncurses TUI which displayed a list of celestial bodies currently above the horizon from your position along with their current status (like visibility due to weather), approximate altitude and azimuth, etc. You'd scroll through the list, highlight the body you want to shoot and select it, which provides you with Hs (and then perhaps increments the time so you have to be choosy about what to sight during limited time at twilight). Maybe have different tabs in the UI for a navigation log, DR information, weather log/barometer, and a 'helm'.

That's how I would approach it anyway. Not sure if you were thinking along similar lines.