To set it up, input your current location and destination, and select a friend from your contacts list to be a "companion" (they don't need to install the app.) Once you start your route, your friend will be able to see if you wander from your course, suddenly start running, or your headphones get pulled out. In any of these cases, you'll set off a "Smart Trigger." If you don't respond, the app will alert your companion. You can also easily reach out to your companion or the police with a single tap.