Exact-a-mundo. Turn on the GPS, take a fix, turn it off. In this mode lithium batts last for weeks and weeks of use.
In my original comment I forgot to mention the absolutely critical "take a fix" step. They would have needed to turn the GPS on and create a waypoint for the hotel, parking lot, shelter, .... a safe place.
Without that, all they might have is the direction and distance to a great fishing spot back home.
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