Meet the Garmin inReach Mini 2 Satellite Communicator: a smart handheld device for hiking and other outdoor adventures. It comes with two way messaging and interactive SOS function. It lets you share your location with others at any time. It also has a TracBack routing function to get you back to your starting point when lost.
You can connect and sync this device to your mobile phone. It also works with other Garmin devices. Messaging, SOS, and tracking are done via the Iridium satellite network.