EPIRBs (emergency position-indicating radio beacons) like the ACR Global Fix iPro ($699.95, thegpsstore.com) and PLBs (personal locator beacons) such as the floating ACR ResQLink+ ($249.95, thegpsstore.com) represent the only types of devices that the Coast Guard will respond to immediately — once the distress signals are activated — using satellite signals broadcasting GPS coordinates to pinpoint your location.
