Four emergency locator beacons

William Marshall ventured 20 miles offshore on November 15, 2024, and never expected to have catastrophic engine failure at sea. Worse yet, threatening storms forming ahead of weather reports loomed over them. He activated his EPIRB—a larger cousin to the PLB—and 45 minutes later, Sea Tow showed up, followed by a Coast Guard rescue boat. Loss of life was averted, and Marshall and his crew lived to fish another day.

This is just one of many rescue stories enabled by emergency ­locator beacons. Here is what you need to know about rescue PLBs and SOS messengers.

Personal locator beacons are designed to speed rescue by SAR teams via government-run Cospas-Sarsat satellites, which are programmed to notify appropriate response authorities—such as the US Coast Guard, or terrestrial rescuers for skiers and ­hikers—of an emergency. PLBs are the most compact and are ­being adopted with increasing frequency by recreational ­boaters.

Another type of beacon device is an SOS messenger, which is designed to use private ­communication satellites such as Globalstar to ­communicate with private rescue-­coordination bureaus to reach rescue authorities at sea or in the ­wilderness. An added benefit to these is that they allow ­limited ­two-way ­communication, but unlike a PLB, they require a ­satellite-service fee. – Full report