Celestial Navigation? Forget it!
Although I do not get to sail as often as I would like (especially during the last 6 years) as I am curently driving an 18-wheeler around the country. I still keep up with my CN skills by periodically using a sextant I picked up in a pawn shop over 25 years ago.
Navigation has gotten far easier over the years but it is not quite idiot-proof yet. GPS''s are great and wonderful tools, but batteries go bad electronics do break and if you are in the middle of the Atlantic or Pacific when things go South it is nice to know that you can figure out where you are.
When I eventually do get to follow my dream of circumnavigation you can bet that I will have my old sextant on board and another plastic one in my ditch-kit because one never knows when Murphy may try and board.