Sounds like a great idea, MNS, but I'd want to know if this is a legal option with the Feds for button-pushing, first. However, I can think of few instances in which being overdue at panic + 48 hours wouldn't be due to illness, injury or being lost. Especially if at panic time I were already 24 hours overdue.

The only situation I can think of right now that would be an illegal button-push would be if my dog got sick or injured. However, I never expect to be so isolated that someone wouldn't come along within 12 hours whom I could ask to notify a horse outfitter or (around my area) the Oregon Humane Society which has a pet rescue unit.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey