We are underway aboard the 134 foot tall ship Corwith Cramer, and we take evening star observations of Jupiter and Polaris with a sextant, and then we do all the math to reduce them to a fix using the techniques of celestial navigation.
Two quick notes: the watch time was actually 20 seconds fast, not slow, sorry for mis-stating that. The math is correct though. And I skip the GHA increments for Polaris since I'm just looking for a quick and dirty whole number of LHA.