ACR AquaLink™ 406 MHz GPS Personal Locator Beacon Head offshore with confidence. With three levels of integrated signal technology — GPS positioning, a powerful 406 MHz signal and 121.5 MHz homing capability — the AquaLink™ quickly and accurately relays your position to a worldwide network of Search and Rescue satellites, reducing search time and increasing your chances of survival. It’s reliable signaling technology that has saved more than 26,800 lives since 1982.