Emergency location beacons are fast becoming essential items of safety equipment that everyone should have on board. With the cost of these devices having significantly decreased over the last few years, it’s a great time to add some peace of mind to your next sailing adventure. With such a vast range of models on the market, however, which is the right one for you?
See the guide below for the different types of safety beacons available and which is best for your needs.
What is an EPIRB?
An Emergency Position Indicating Radio Beacon, or EPIRB, is a device carried on a vessel which can alert Search and Rescue to your location in the event of an emergency.
EPIRBs are registered to your vessel and once activated they send a coded message via the 406 MHz distress frequency which is relayed via satellites to Search and Rescue. Once activated it sends a message via the 406 MHz distress frequency which is relayed via satellites to Search and Rescue. This gives the beacon worldwide cover.
All EPIRBs are now required to have built-in GPS receivers which send out your position as well. This then gives a location accuracy of under 100m.
In addition, EPIRBs have a 121.5 MHz homing beacon. Rescuers use this when they are in the right area to pinpoint your exact location.
McMurdo Smartfind G5 Ocean Signal EPIRB1
What is a PLB?
“PLB” stands for Personal Location Beacon. It is a device that can be used in life or death emergency situations to alert Search and Rescue services to your location. Essentially, a PLB is a scaled-down model of a 406 MHz EPIRB.
All PLBs that we sell have built-in GPS receivers which send out your position encoded into the 406 MHz frequency. This then gives a location accuracy of under 100m.
In addition, PLBs have a 121.5 MHz homing beacon. Rescuers use this when they are in the right area to pinpoint your exact location.
McMurdo Fastfind 220 PLB Ocean Signal RescueMe PLB1
Difference between PLB and EPIRB
Unlike EPIRBs, a PLB is registered to an individual person and not the vessel. This means that Search and Rescue will know exactly who is in distress and can take appropriate action. This makes it ideal for individuals who move between vessels or enjoy other land based activities.
PLBs can only be activated manually whereas EPIRBs are manual and automatic (water activated).
Once activated, a PLB will transmit for a minimum of 24 hours. An EPIRB will transmit for at least 48 hours.
What is an AIS Beacon?
An Automatic Identification System (AIS) is an automatic tracking system originally designed for vessels to aid in collision avoidance. Now the same technology has been adapted to help in “man over board” (MOB) situations. Because of this, you might often hear them referred to as AIS Man Overboard (MOB) devices. These devices are also known as AIS-SART or AIS Search and Rescue Transponder.
An AIS beacon, once activated, transmits an MOB message to an AIS equipped vessels within range (approx. 1-5 miles). A built-in GPS receiver ensures that your exact location is sent.
This is then displayed on a chartplotter or other screens that have an AIS interface as an MOB icon.
Most AIS beacons are designed to be fitted inside a life jacket and will activate automatically upon inflation.
McMurdo Smartfind S20 AIS Ocean Signal MOB1 AIS
Do I buy an AIS beacon or PLB?
These two devices have a different purpose: AIS beacons are primarily designed for MOB rescue, while PLBs alert the emergency services to a life or death situation.
In a “man overboard situation,” the first thing to consider is who is most likely to rescue you. The best chance of rescue is usually from your own vessel. An AIS beacon would be more suited for this situation, as it will alert your own boat or boats within range.
Single-handed sailors may probably benefit more from a PLB to contact the emergency services, especially if there are no other vessels within range.
Also, if you want to be able to see AIS MOB on your vessel you will need to have an AIS system on board. We are happy to help you identify the correct product for your individual needs.
Neither device has a subscription fee, although you are required to register the PLB with your local authority.
Model Comparison Table
|Beacon Type||EPIRB||PLB||AIS Beacon|
|Make / Model||McMurdo G5||Ocean Signal EPIRB1||McMurdo 220||Ocean Signal PLB1||McMurdo S20||Ocean Signal MOB1|
|Battery Life (Standby)||6 years||10 years||6 years||7 years||7 years||7 years|
|Minimum Operation Time||48 hours||48 hours||24 hours||24 hours||24 hours||24 hours|
|Dimensions D x W x L (mm)*||115 x 108 x 225||89 x 89 x 178||34 x 47 106||32.5 x 51 x 75||27 x 47 x 124||27 x 38 x 134|
|Activation||Auto & Manual||Auto & Manual||Manual||Manual||Auto** & Manual||Auto** & Manual|
*Smallest stowed dimensions
**When fitted correctly in life jacket