The AquaLink™ broadcasts a unique registered distress signal that not only tells rescuers where you are, but who you are. The onboard GPS can fix your position to within 100 meters and then utilizes a powerful 406 MHz signal to relay your distress call to orbiting satellites. As local Search and Rescue is deployed, a separate homing signal and integrated LED strobe light guide rescuers to your exact location. The AquaLink™ is small enough to be easily carried in a pack or pocket or can be worn on deck, at the helm, in quarters or on a life vest and will float if accidentally dropped overboard. Performing a full functional self-test of the PLB's internal circuitry, battery voltage & power and 406 MHz transmission gives you the peace of mind knowing your PLB will work the moment you need it the most. ACR Exclusive: Built-in GPS acquisition test mode allows you to test GPS functionality up to 12 times over the life of the battery. Nearly instant alerting of Search and Rescue forces