A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tony Oz
Date: 2018 Oct 23, 12:48 -0700
Some nit-picking on your article, you say:
...this watch does not compute longitude by itself unless you happen to be somewhere on the Greenwich meridian...
Actually this is the other way around: the watch does show your longitude when Sun's GHA is zero.