Well, if you'd like to check the results of you black-art practices, try this little thing:
Astronavigation - Simple celestial navigation program
It doesn't look pretty, and it may look complicated, but it's not, just keep [Enter] pressed for a second or so as it starts, then just change a couple of values.
It's small and free, thing is, it's for DOS, so if your OS doesn't support it, you'll need a little emulator like DosBox, which works just fine in win and linux
In my opinion, usability-wise, it beats all the prettier win-based programs I tried, get used to it in a minute, and it's really quick-and dirty, which at sea can be a great advantage