I got the 301. It arrived today. Hopefully, the bugs have been worked out.

Years ago, a friend had trouble with his expensive "yachting chronometer" (wrist watch), falling off his wrist and disappearing into the drink. So, he cut a section off the arm of a defunct wet suit, cut a hole in it so he could read his watch and slipped it over his wrist and watch. He was able to push all the buttons just fine and had no more problems. Maybe I'll try something like that, except on the boom.