I have a relatively cheap GPS locator that can send two messages that I can create (”I’m good - love you!” and “Need help but not an emergency”). Also has the emergency button that will send rescue crews to my location.
Working in a remote location it is comforting to my wife to hear from me at lunch out at the site and then back at base camp for the night.
There are better ones (and more expensive) where you can send and receive text messages via the satellites too.
Smart. Places I’ve elk hunted a broken leg is as lethal as a bullet in the head. Lost in December in the Rockies can and is terminal in a lot of cases.