I taught myself how to do a celestial fix in the early 1980s. Why? Offshore racing skippers often needed navigators and I wanted a ride. I now have 4 sextants. One came from my wife's grandfather, a Weems & Plath. One came from her father, a Navy pilot, so it is a bubble sextant. The other 2 I acquired, a Tamaya Jupiter and an Astra 3B. The Astra is the most useful since it is a full field, rather than a split view sextant. Just remember, the sextant is only a rather small part of celestial navigation. You need a nautical almanac, sight reduction tables, and plotting sheets. Knowing how to "do the math" is the biggest challenge. Yes, there are "apps" for that, but you need something to reduce your sights to a fix. I have the chip that will allow an HP-41 programmable calculator to do that. Who remembers the HP-41? I also have the original publication HO-209, Ageton's Tables, which is an elegant if time consuming way to reduce sights. I also have HO-229 and HO-249 (for air navigation). The point is, this is all an exercise in nostalgia. When I last ran the "ditch" we had 9 separate electronic devices aboard to tell us where we were. My laptop computer, my wife's laptop, my I-pad, my wife's I-pad, my I-phone, my wife's I-phone, the pilot house chart plotter, the flybridge chart plotter, and an old Garmin GPS-76. The sextant was only for fun. Make no mistake, I think it is great fun, but when time is of the essence and you really need to know where you are, there are better ways.