A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Bill Lionheart
Date: 2016 Feb 12, 04:23 -0800
Thanks that is really helpful, especially in that the key words I need to look for are "freeze time of day" stopwatch.
The good news is that clearly there is a need for these for some other (maybe sports) purpose!
The web site list some higher end ones with this capability