the Garmin inReach Mini emergency transmitter that utilizes the Iridium satellite network on my solo adventures. It’s truly small and compact and lightweight, but you also need an active subscription plan for tracking, messaging and interactive SOS.
As you can see, the device is truly tiny. There’s no excuse not to carry one if you frequently wander off the beaten track. I’ll even carry this on my various expeditions around the world, as it has global coverage, pole to pole.