Quote Originally Posted by r.e. View Post
What sextant did you use? Still have it?
It was a plastic Davis Mark Master. No, I don't have it anymore.

I really didn't need the Astronomical Almanac for navigation, of course. I once ordered full-precision planet and moon ephemeris from the US Naval Observatory that came on a big magnetic tape. But the coordinate data was referenced in the Terrestrial Dynamic Time (TDT) scale. So I had to dive into the astronomical end to learn about all the different time scales, how to use and where to find the data to convert between some of them.