ACR EPIRB Guide: How to Choose the Right Beacon for Your Boat

When choosing marine safety equipment for your boat, it is easy to concentrate on the items you use regularly. Lifejackets, VHF radios, navigation equipment and first aid kits all have an obvious role on board. An ACR EPIRB is different. It may spend most of its life unused, but in a serious emergency at sea, having the right beacon could make a crucial difference.

An EPIRB, or Emergency Position Indicating Radio Beacon, is designed to send a distress alert when a vessel or the people on board need assistance. For UK boat owners, operators and marine professionals, choosing one is not simply about picking a model from a catalogue. The vessel, operating area, activation method, positioning capability, installation and maintenance all need to be considered.

This guide looks at what matters when choosing an ACR EPIRB and how it fits into a wider approach to marine safety equipment.

What Is an ACR EPIRB and How Does It Work?

An EPIRB is an emergency beacon designed primarily for vessel-based distress situations. When activated, a 406 MHz beacon sends a distress signal that can be detected through the COSPAS-SARSAT satellite system. The alert is then passed through the appropriate search and rescue network.

Each beacon has a unique identification code associated with its registration details. This allows relevant authorities to identify the beacon and access information about the vessel and its emergency contacts.

An ACR EPIRB can therefore provide an additional way of raising the alarm when conventional communication methods are unavailable, damaged or outside reliable range.

This can be particularly important for vessels operating offshore or in areas where there may be limited access to immediate assistance.

Does Your Boat Need an EPIRB?

The answer depends on your vessel, where you operate and the conditions in which you normally travel.

For boats that venture beyond reliable VHF coverage, a 406 MHz distress beacon can provide an important additional layer of emergency preparedness. The RYA recommends carrying a 406 MHz beacon for small craft operating outside reliable VHF range.

An EPIRB can be particularly useful for offshore cruising, longer yacht passages, commercial operations and fishing activities. It can also be valuable where the crew may need to abandon the vessel and rely on survival equipment while waiting for assistance.

However, an EPIRB should not be considered a replacement for other forms of marine safety equipment. A well-prepared vessel needs a combination of equipment suited to its size, operating area and the people on board.

What Should You Look for in an ACR EPIRB?

The best ACR EPIRB for one vessel may not necessarily be the best choice for another. Before buying or replacing one, it is worth looking beyond the product name and considering the features that could affect its usefulness during an emergency.

406 MHz Distress Transmission

One of the first specifications to check is 406 MHz transmission. This frequency is used for satellite-based distress alerting through the COSPAS-SARSAT system.

The beacon's unique identification information is transmitted with the distress alert, allowing the signal to be associated with the registered vessel.

Integrated GPS or GNSS

Positioning capability is another important consideration.

An EPIRB with integrated GPS or GNSS can transmit location information as part of the distress alert. This can help search and rescue services establish the beacon's position more quickly than relying solely on subsequent satellite detections.

For boat owners comparing different models, integrated positioning can therefore be a worthwhile feature to consider, particularly when the vessel regularly operates offshore.

Manual or Automatic Activation

The way an EPIRB activates can make a significant difference during an emergency.

A manually activated beacon requires someone on board to remove or activate it. An automatic EPIRB is designed to release from its housing and activate when a sinking vessel reaches the appropriate conditions.

Automatic systems need careful installation. The beacon needs to be positioned so that it can release properly if the vessel founders, while also being protected against accidental activation or damage.

Battery Life

Battery life is another factor that should not be overlooked. Once activated, the beacon needs enough power to continue transmitting while rescue operations are taking place.

Check the manufacturer's battery life, replacement requirements and servicing recommendations before making a purchase. An EPIRB with an expired battery is not providing the protection you expect from your marine safety equipment.

Size and Accessibility

A beacon also needs to be practical for the vessel.

A manually activated EPIRB should be kept somewhere that crew members can reach quickly during an emergency. Depending on the vessel and setup, this may include an appropriate emergency equipment location or life raft grab bag.

There is little benefit in having an emergency beacon on board if nobody knows where it is or cannot reach it when conditions become difficult.

Manual or Automatic EPIRB: Which Is Right for Your Boat?

There is no universal answer to whether manual or automatic activation is better.

A manual EPIRB can be appropriate when crew members can quickly access and activate the beacon. It also gives the operator control over when the device is activated.

An automatic EPIRB can provide an additional safeguard if a vessel founder and the crew cannot manually deploy the beacon. However, automatic systems require suitable installation and release arrangements.

The decision should therefore be based on your vessel, operating conditions and emergency procedures rather than simply choosing whichever activation method appears more advanced.

Where Should You Install or Store an EPIRB?

The location of an ACR EPIRB deserves as much attention as the device itself.

For a manual beacon, accessibility is the priority. It should be possible to reach it quickly during an emergency, and everyone who may be responsible for the vessel should know where it is.

For an automatic EPIRB, installation becomes even more important. The unit needs to be positioned correctly so it can release if the vessel sinks while remaining protected during normal operation.

It is also worth including the EPIRB in your onboard safety briefing. Crew should understand where the beacon is, whether it is manual or automatic, how it operates and when it should be used.

A safety device is only as useful as the people who know how to use it.

ACR EPIRB vs PLB: What's the Difference?

EPIRBs and Personal Locator Beacons, commonly known as PLBs, both use 406 MHz satellite distress technology, but they are intended for different situations.

An EPIRB is primarily associated with the vessel, while a PLB is designed to be carried by an individual. PLBs are generally smaller and manually activated. EPIRBs are designed to provide vessel-based distress alerting and are intended to float in an appropriate orientation for transmission.

For someone using a small RIB or personal watercraft, carrying a PLB may be particularly useful. A yacht or larger vessel may benefit from an EPIRB as part of its wider emergency setup.

In some circumstances, the two can complement one another rather than being treated as alternatives.

UK EPIRB Registration: What Boat Owners Need to Know

Registration is an important part of owning a 406 MHz beacon in the UK.

Under the current UK requirements, 406 MHz EPIRBs and PLBs carried on relevant UK-registered ships, hovercraft and watercraft must be registered with the UK 406 MHz Beacon Registry. The registration service is provided free of charge.

Registration connects the beacon's unique identification details with information about the vessel and its owner. This information can help authorities understand which vessel is in distress and who may need assistance.

When registering a beacon, owners may need to provide details such as the vessel name, MMSI, radio call sign, beacon serial number, HEX ID, owner information and emergency contacts. Additional vessel and equipment information may also be required depending on the registration circumstances.

Keeping these details up to date is just as important as completing the initial registration. If ownership, vessel details or emergency contacts change, the registration information should be updated.

How to Maintain Your ACR EPIRB

Buying an ACR EPIRB is only the beginning. Like other marine safety equipment, it needs to remain ready for use throughout its service life.

Regular checks should include the beacon's physical condition, battery status, test functions, mounting arrangement and registration details. The manufacturer's instructions should always be followed for testing, battery replacement and servicing.

MCA guidance also provides maintenance and testing recommendations for applicable EPIRBs, including shore-based maintenance by competent personnel. The precise requirements can depend on the vessel and the regulations that apply to it.

This is also a good opportunity to inspect your wider marine safety supplies. An EPIRB may be fully operational, but expired flares, damaged lifejackets or missing emergency equipment can still create weaknesses in your overall safety plan.

Common Mistakes When Choosing an EPIRB

One of the most common mistakes is choosing an EPIRB based primarily on price.

The cheapest option is not necessarily the most suitable for your vessel. Features such as integrated GPS, activation method, battery requirements and installation arrangements can all affect how useful the beacon will be in an emergency.

Another common mistake is purchasing the right type of beacon but storing or installing it incorrectly. A manual EPIRB that cannot be reached quickly or an automatic beacon that cannot be released properly will not provide the intended level of protection.

Registration and maintenance are also easy to overlook. Keeping the beacon registered, checking its service life and making sure crew members understand how it works should all form part of your routine safety checks.

How to Choose the Right ACR EPIRB for Your Boat

Before choosing an ACR EPIRB, start with your vessel rather than the product specification.

Think about where you normally operate. A boat staying close to shore has different considerations from one regularly making offshore passages. Consider how far you may be from reliable VHF coverage and how quickly assistance could reach you.

You should also consider who is on board and whether the crew could reach and activate the beacon during an emergency. If automatic deployment is being considered, make sure the vessel is suitable for the relevant installation and release arrangement.

GPS or GNSS capability, battery life, mounting options and servicing requirements should then be assessed alongside the manufacturer's specifications.

Taking this approach helps you select a beacon that fits your actual operating conditions rather than simply choosing a device based on a list of features.

Building a Complete Marine Safety Setup

An ACR EPIRB is one part of a broader emergency preparedness strategy.

Your complete marine safety equipment setup will depend on the vessel and its operation. It may include lifejackets, liferafts, VHF communications, first aid equipment, lifebuoys, signalling equipment and other emergency supplies.

The important point is that these items need to work together. An EPIRB can provide a satellite distress alert, but it does not replace the need for appropriate flotation, communication, signalling or survival equipment.

The RYA's guidance also stresses the importance of choosing distress alerting and locating equipment according to the vessel and its operating area.

Choosing Marine Safety Supplies for Your Vessel

When selecting marine safety supplies, think about more than the initial purchase.

Equipment should be suitable for the vessel, appropriate for the environment and maintained throughout its service life. It should also be accessible when required, with crew members familiar with its purpose and operation.

For UK boat owners and marine professionals, access to appropriate servicing, replacement equipment and practical advice can also be valuable. Safety equipment is something that needs attention throughout the life of a vessel, not just when it is first purchased.

How ADEC Marine Can Help With Marine Safety Equipment

Selecting the right safety equipment can be easier when you have access to specialist marine advice.

ADEC Marine provides marine safety equipment and supplies for boat owners and operators, helping customers source equipment for different vessels and operating requirements.

Whether you are replacing an existing beacon, reviewing your emergency equipment or preparing a vessel for offshore use, it is worth considering the complete safety setup rather than treating an EPIRB as an isolated purchase.

A Simple EPIRB Readiness Check

Before heading offshore, take a few minutes to check that your EPIRB is ready for use. Confirm that it is appropriate for your vessel, correctly installed or stored, registered where required and within its battery service life.

Also make sure the registration information is accurate and that the crew knows where the beacon is located and how it should be used.

A quick check of these details can form part of your wider pre-departure safety routine alongside your other marine safety supplies.

Final Thoughts

An ACR EPIRB is not something most boat owners expect to use. That is exactly why choosing the right one and keeping it ready matters.

The decision should be based on your vessel, operating area, crew and likely emergency scenarios. Features such as 406 MHz transmission, GPS/GNSS capability, activation method and battery life all deserve consideration, while correct installation, registration and maintenance are equally important.

More broadly, an EPIRB should sit within a complete approach to marine safety equipment. When your life-saving equipment is suitable, accessible, registered and properly maintained, you are in a stronger position to respond if something goes wrong at sea.

For UK boat owners, operators and marine professionals, choosing dependable marine safety supplies and maintaining them properly is one of the most practical steps you can take towards being better prepared for an emergency.