As the early morning fog burned away, I scrambled aboard a search-and-rescue helicopter on a mission to locate some overdue hunters. With nothing to go on except a vague idea of their destination, we flew all day through canyons, across ridges and peaks and over dense forest. We followed every trail they might have driven in their bobtail 4x4. We strained our eyes looking for clues but saw nothing. Then, as the sun was about to set, we saw it-the orange glow of sunset, reflecting off the windshield of their vehicle. We had found them, but we could have done so much more quickly if they had been actively signaling us.