The Mag not only detects nearby Ryuker devices and beacons, it can also be used to help you find items in the world. 1. Go into the menu and select Gear/Sub-Palette. 2. From the Equipment Menu choose Mags. 3. Select Active Sonar Target Settings. From there you can use your Mag's sonar to target various collectables. When you're nearby a Sonar Target, the Mag will beep and light up.