If you think you’re getting in over your head and you think you’re going to need help, push the SOS button on your satellite messaging system. It is always better to push the button than not to.
When you hit the SOS button on an inReach or a satellite-enabled phone, you’re not calling 911—you’re tossing a digital flare into space and hoping someone up there is paying attention. Good news: they are.
Devices like Garmin inReach talk to satellites orbiting roughly 500–1,200 kilometers above Earth. Instead of relying on cell towers (which stop existing the moment the trailhead disappears), your device sends a short, low-power message straight up. The satellite receives it, figures out where you are using GPS data embedded in the message, and relays it down to a ground station. From there, it’s handed to a 24/7 emergency coordination center staffed by real humans who like maps and hate ambiguity.
That center contacts the appropriate Search and Rescue authority—local sheriff, park service, coast guard, or volunteer SAR team—based on your coordinates. If your device allows two-way messaging, rescuers can ask what’s wrong, and what injuries you have. They will also direct you to either continue to move or stay where you are if that’s appropriate.
Modern phones with satellite SOS work similarly, though they often require a clear view of the sky and a bit of patience while you aim the phone like you’re trying to summon extraterrestrials.
Bottom line: satellites don’t rescue you. They make sure the right humans know exactly where to find you—usually faster than yelling into the void ever could.