I never thought about it until it came up here. I guess you can always carry a satellite phone but even that is no guarantee of success I've been mountain biking in the Santa Cruz mountains with a GPS and unable to "see" satellites due to terrain and tree cover. If you don't want to vanish without a trace, LoJack might be your best bet! It broadcasts a radio beacon. Just have your wife report your car stolen when you don't show up.
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