PLB Registration and Battery Life: What Every Owner Must Know

An unregistered or expired PLB can fail you

A personal locator beacon only works if rescuers can identify it and its battery can power it. Registration and battery life are the two things owners most often neglect, and both can slow or weaken a rescue.

This guide covers how to register your PLB, what the two battery ratings mean, how to check your expiry date, and when to get professional service. If you are still choosing a beacon, read our PLB vs EPIRB vs SART vs AIS beacon comparison first, and see how a PLB works for the alert chain.

Why PLB registration matters

Registration is free, and it links your beacon to you. NOAA explains that registration lets search authorities identify the owner and the vessel, and call you to confirm whether a distress is real before launching a search. The beacon’s unique 15-character Hex ID is the key that connects the signal to your record.

The U.S. Coast Guard’s beacon registration brochure adds three points worth knowing:

• Federal rules require registration.
• You must provide a 24-hour emergency contact who knows your travel plans.
• Failing to register, or failing to report a change of ownership, could result in penalties or fines.

In short, a registered beacon helps rescuers act faster, avoids costly false-alarm responses, and keeps you compliant.

How to register your PLB

In the United States, register your beacon for free on NOAA’s beacon registration site. Follow these steps:

1. Find your Hex ID. It is printed on the beacon and its packaging. The Coast Guard brochure calls it the beacon’s Unique Identification Number and stresses entering it exactly, because it is the only link between your beacon and your record.
2. Create your record. Enter your name and contact details.
3. Add a 24-hour emergency contact. Choose someone who knows your trip plans.
4. Add optional details. Vessel information, medical conditions and trip notes can help responders.
5. Keep it current. NOAA contacts you every two years to verify your details, and you can update them at any time.

If you sell or give away the beacon, or take it out of service, update the registration. Some updates are mandatory.

Outside the U.S.: register with your own country’s beacon registry. The Cospas-Sarsat site is a starting point for finding your national authority. Once registered, see how a PLB works to understand what happens after an alert.

PLB battery life: standby life vs operating life

PLB batteries carry two separate ratings, and they answer different questions.

Standby life tells you when to replace the battery, and operating life tells you how long help has to reach you. An expired battery may not deliver the full operating time, even if the beacon still switches on.

Both figures vary by model, so rely on the expiry date marked on your beacon and the manufacturer’s manual. Compare rated times when you shop in our personal locator beacons and S.A.R.T.s category.

How to check your battery expiry and self-test

Checking takes a few minutes, and you should do it at least once a season.

1. Read the expiry label. Find the battery expiry date printed on the beacon, and note it in your calendar well ahead of time.
2. Run the self-test as the manual directs. Self-tests confirm the electronics and, on GNSS models, the position fix. They also use some battery, so do not repeat them more often than the manufacturer advises.
3. Never trigger a live alert to test. A false alert starts a real response and can lead to penalties. The Coast Guard brochure notes that registration data helps responders tell accidental activations from real emergencies.
4. Replace the battery on schedule. Do not wait for the date to pass.

Battery replacement on most 406 MHz beacons should be done by the manufacturer or an authorised service centre, not at home. That keeps the beacon sealed, tested and compliant.

Why professional PLB servicing matters

A PLB is sealed safety equipment, and opening it without the right tools can break its waterproofing or leave it out of compliance. Professional servicing checks the beacon, replaces the battery and documents the work.

Marine Rescue Technologies is an authorised service centre for sMRT and WeatherDock PLBs, offering inspection, maintenance and technical support to keep beacons reliable and compliant. Start at our service and inspection page, or go straight to the WeatherDock service page. You can also explore the sMRT and WeatherDock ranges.

PLB maintenance and storage checklist

Use this list at the start of each boating season and after any rough trip:

• Confirm the beacon is registered and the details are current.
• Check the battery expiry date and schedule service early.
• Inspect the case, antenna and any lanyard or mount for damage or corrosion.
• Run the manufacturer’s self-test, and no more often than advised.
• Rinse off salt water after exposure and dry the beacon before storing it.
• Store it where you can reach it quickly, such as a life jacket pocket, away from extreme heat.
• Tell everyone on board where the beacon is and how to activate it.
• Update the registration if you sell or lend the beacon.

Frequently asked questions

Is PLB registration free? Yes. Registration with NOAA is free and is required for 406 MHz beacons.

How often must I update my PLB registration? NOAA contacts you every two years to verify your details, and you should update them whenever they change.

What happens if I sell my PLB? Update the registration to reflect the change. Failing to do so could result in penalties or fines.

How long does a PLB battery last? Two ratings matter: standby life, often around five years, and operating life of at least 24 hours once activated. Always check your model’s label.

Can I replace the PLB battery myself? It is not recommended. Use the manufacturer or an authorised centre such as our service and inspection team.

Does an AIS MOB beacon need the same registration? Requirements differ from 406 MHz beacons, so follow the manufacturer’s guidance. Our beacon comparison explains how the types differ.

Register it, date it, service it

A beacon that is registered, in date and professionally serviced gives rescuers the best chance of finding you quickly. Register once, set a calendar reminder for the battery, and re-check each season.

Need a beacon, or a service for the one you own? Browse our personal locator beacons and S.A.R.T.s, visit our service and inspection page, or book a free consultation.