A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Eitan A
Date: 2017 Sep 26, 09:28 -0700
the hacking function of the watch by means of the crown is best described here. I've pulled out the relevant section.
Hacking a watch, you are correct, is not great on the movement, Weems came up with a solution in the second setting watch.
I've also added an advert for the Longines Weems at the time, which I thought might be of interest.