After confirming the alarm you will first be presented with the MOB compass.
Your boat is shown at the centre of the compass and a MOB icon represents the direction to the MOB’s point of loss. You steer for the rescue course shown on screen until the icon is right in front of the boat. The icon then turns green and gets bigger as you approach. There’s no map reading involved; it’s really simple and intuitive.
Once you get close to the loss point, the system initiates a homing feature, which is also what rescue helicopters use. A search perimeter is drawn around the point of loss, based off the time passed to account for drift by current and wind. The beacon will rapidly emit a signal saying, “I’m here, I’m here, I’m here.” Because of Bluetooth’s poor performance in water, the phone will only receive this signal when it is in close proximity. Once received the app will notify you and tell you to try to establish vocal and visual contact with the MOB.