I’ve got an old Timex Marathon digital watch that was a gift my freshman year at the academy. It was $15 from Target. The strap and decorative trim on the front are long gone. I’m on my second set of pins and fourth or fifth battery. I made a small strap to replace the broken one that allows me to put it on my belt. It sits upside down on my belt so that it reads right when I look down at it. My t-shirt usually keeps it covered up and helps to protect the face. It was cheap, rugged, and, best of all, allows you to change the time in increments of hours, ten minutes (handy for 20 minute time changes), single minutes, or seconds. It does a 24 hour clock and has built in countdown timers for 15 seconds, 30 seconds, and 1, 5, 10, 15, 30, 60 minute intervals, along with the stop watch stuff. It’s just a simple, inexpensive and rugged watch that is going on 14 years old.
I talked with a buddy who designs phone apps about a mariner’s clock app for time changes, time zones, etc, but realized that I probably wouldn’t really use it at all and I don’t know enough about what the Mate’s need to make it truly useful. I never really followed through with it due to other projects and a quick glance through the app store showed that it’s already been done.