Beauteous Brass Sextant Measures approx 4-5/8" x 4-1/4" x 3-1/4" OA and comes in a very nice wooden Beauteous Brass Sextant Sextants came along after astrolabes but before GPS. (Just like you.) They&#39;re used for finding latitude and the distance between objects, and are still the non-electric, non-satellite-dependent back-up for navigators. Ours is a beauty in solid brass with glass optical components, at a tiny price. Measures approx 4-5/8" x 4-1/4" x 3-1/4" OA and comes in a very nice wooden case. Includes instructions for use, which you&#39;re going to need unless you went to Annapolis where they still teach it because computers can still go all kaflooey. (Note that well before computers started going kaflooey, compasses and sextants lost an adventurer here and there, too, so don&#39;t call us if you and the sextant set out for Madagascar and end up in Iceland.)