BOAT-COMPARATOR Guide
Personal locator beacon (PLB) and EPIRB: what they actually do on a rental boat
The difference between a boat's EPIRB and a personal PLB, how each one works, and why every minute shaved off a rescue genuinely matters at sea.
Two acronyms that sound alike and get confused often: the EPIRB, fixed to the boat, and the PLB, worn on the body. Coastal Mediterranean rental boats almost never carry either — neither is mandatory there — but understanding their role sheds light on the rest of the safety gear aboard.
EPIRB: the boat's own beacon
The Emergency Position Indicating Radio Beacon is fixed to the vessel, designed to trigger automatically if the boat sinks — via a float-free bracket — or manually. It transmits on 406 MHz to the international Cospas-Sarsat satellite system, which locates the beacon and alerts the relevant rescue centre, wherever the boat is in the world.
PLB: the beacon a person wears
The Personal Locator Beacon applies the same technology on an individual scale: worn on a lifejacket or in a waterproof pocket, it matters most when someone falls overboard alone, cut off from the boat's own VHF and DSC button. See our guide on what to do in a man-overboard situation.
Why the minutes matter so much
In moderately cold water, the survival window before hypothermia sets in is measured in tens of minutes rather than hours. A study published in the Journal of Thermal Biology, which compiled real-world cold-water immersion survival data, shows just how decisive immersion time remains for survival, ahead of almost every other factor (Xu, X. & Giesbrecht, G.G., A new look at survival times during cold water immersion, 2019, see the study on Google Scholar) — a concrete argument for anything that shortens the time before rescuers are alerted, a PLB included.
On a rental boat, what to actually do
Almost no boat rented on the coastal Mediterranean carries an EPIRB, which is reserved for more offshore cruising or certain foreign regulations — see our guide on the offshore extension of a coastal licence. A personal PLB, on the other hand, is an accessible one-off purchase or rental, most useful solo, at night, or on a more committing passage than a standard coastal day out.
What the operator must supply regardless
Whatever the boat, the mandatory safety kit (lifejackets, VHF, visual signalling gear) must be aboard and checked at the departure inventory — see our guide on mandatory safety equipment. A personal PLB adds to that regulatory baseline, it does not replace it.
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