The watch can hold up to three SOS contacts that can be dialed automatically by your child by long-pressing the dedicated SOS button on the side of the watch.
The watch will call the first number first. If there is no answer after five rings, it will dial the second number, then the third, and attempt the sequence again if there's still no response before finally terminating.
Answer the SOS call and use the map on your app to tap to find the watch's current location.