This is a very significant thread, and i have followed with great interest, but it is worth remembering that in the context of a solo trip, your electronics, while certainly helpful and frequently of crucial significance, are not a panacea. Lots of situations can leave the soloist dazed, disoriented, unconscious, or worse (although in that case the outcome might be irrelevant). This is where a companion is of great value.
Lest I be a hopeless hypocrite, let me add that if I had a nickel for every solo trip or excursion I have taken, we could have a really fine dinner.
Sometimes circumstances dictate solo, and sometimes it is just the lure of blessed solitude.
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Geezer in Chief