I don't see any need for info of any kind while commuting. It's a relatively short trip on a known course, so what else could I need to know.
If I were a surgeon, I'd probably keep a cell phone in my back pocket in case someone had to reach me in an emergency, but I'm not so I don't.
Though I don't use one on tours, I can see the use of a cell phone or GPS for navigating or making arrangements on the fly, and I'll probably start taking a smart phone for lining up hotels near the end of the day, if only a means to shop for better rates.
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