(Emergency Position Indicating Radiobeacon (EPIRB


Types Of Epirb

Emergency position indicating radiobeacons (EPIRBs), devices
which cost from $200 to about $1500, are designed to save your life if you get into
trouble by alerting rescue authorities and indicating your location. EPIRB types
are described below:

Category I

406/121.5 MHZ. Float-free, automatically activated EPIRB. Detectable by satellite anywhere in the world. Recognized by GMDSS.

Category II

406/121.5 MHZ. Similar to Category I, except is manually activated. Some models are also water activated.

121.5/243 MHz EPIRBs

The International Cospas-Sarsat System ceased satellite processing of 121.5/243 MHz beacons on 1 February 2009.  Although Emergency Locator Transmitters used by aircraft may still be used, alerts from these devices or from 121.5/243 MHz EPIRBs will no longer be acted upon unless independently confirmed by two independent non-satellite sources. These Class A, Class B, and Class S devices are no longer allowed to be manufactured, imported, used or sold within the United States. Reference the U.S. Code of Federal Regulations, Title 47, Part 80, Subpart V.

406 MHz EPIRBs

The 406 MHz EPIRB was designed to operate with satellites. The signal frequency (406 MHz) has been designated internationally for use only for distress. Other communications and interference, such as on 121.5 MHz, is not allowed on this frequency. Its signal allows a satellite local user terminal to accurately locate the EPIRB (much more accurately - 2 to 5 km vice 25 km - than 121.5/243 MHz devices), and identify the vessel (the signal is encoded with the vessel's identity) anywhere in the world (there is no range limitation). These devices are detectable not only by COSPAS-SARSAT satellites which are polar orbiting, but also by geostationary GOES weather satellites. EPIRBs detected by the GEOSTAR system, consisting of GOES and other geostationary satellites, send rescue authorities an instant alert, but without location information unless the EPIRB is equipped with an integral GPS receiver.  EPIRBs detected by COSPAS-SARSAT (e.g. TIROS N) satellites provide rescue authorities location of distress, but location and sometimes alerting may be delayed as much as an hour or two. Although these EPIRBs also include a low power 121.5 MHz homing signal, homing on the more powerful 406 MHz frequency has proven to be a significant aid to search and rescue aircraft. These are the only  EPIRB types which can be sold in the United States.

A new type of 406 MHz EPIRB, having an integral GPS navigation receiver, became available in 1998.  This EPIRB will send accurate location as well as identification information to rescue authorities immediately upon activation through both geostationary (GEOSAR) and polar orbiting satellites.  These types of EPIRBs are the best you can buy.

406 MHz emergency locating transmitters (ELTs) for aircraft are also available. 406 MHz personnel locating beacons (PLBs) are available.

The Coast Guard recommends you purchase a 406 MHz EPIRB, preferably one with an integral GPS navigation receiver. A Cat I EPIRB should be purchased if it can be installed properly. An EPIRB can also be rented from multiple providers. It can save your life.

406 MHz GEOSAR System

The major advantage of the 406 MHz low earth orbit system is the provision of global Earth coverage using a limited number of polar-orbiting satellite.  Coverage is not continuous, however, and it may take up to a couple of hours for an EPIRB alert to be received.  To overcome this limitation, COSPAS-SARSAT has 406 MHz EPIRB repeaters aboard several geostationary satellites.

Note that GEOSAR cannot detect 121.5 MHz alerts, nor can it route unregistered 406 MHz alerts to a rescue authority.  GEOSAR cannot calculate the location of any alert it receives, unless the beacon has an integral GPS receiver.


COSPAS-SARSAT is an international satellite-based search and rescue system established by the U.S., Russia, Canada and France to locate emergency radio beacons transmitting on the frequencies 121.5, 243 and 406 MHZ.


Space System for Search of Distress Vessels (a Russian acronym)


Search and Rescue Satellite-Aided Tracking

Testing EPIRBs

406 MHz EPIRBs can be tested through its self-test function, which is an integral part of the device.  406 MHz EPIRBs can also be tested inside a container designed to prevent its reception by the satellite.  Testing a 406 MHz EPIRB by allowing it to radiate outside such a container is illegal.

Battery Replacement

Batteries must be replaced by the date indicated on the EPIRB label using the model specified by the manufacturer. It should be replaced by a dealer approved by the manufacturer. If the replacement battery is not the proper type, the EPIRB will not operate for the duration specified in a distress.

Registration Of 406 MHz EPIRBs

Proper registration of your 406 MHz satellite emergency position-indicating radio beacon (EPIRB) is intended to save your life, and is mandated by Federal Communications Commission regulations. The Coast Guard is enforcing this FCC registration rule.

Your life may be saved as a result of registered emergency information. This information can be very helpful in confirming that a distress situation exists, and in arranging appropriate rescue efforts. Also, GOES, a geostationary National Oceanic & Atmospheric Administration weather satellite system can pick up and relay an EPIRB distress alert to the Coast Guard well before the international COSPAS-SARSAT satellite can provide location information. If the EPIRB is properly registered, the Coast Guard will be able to use the registration information to immediately begin action on the case. If the EPIRB is unregistered, a distress alert may take as much as two hours longer to reach the Coast Guard over the international satellite system. If an unregistered EPIRB transmission is abbreviated for any reason, the satellite will be unable to determine the EPIRB's location, and the Coast Guard will be unable to respond to the distress alert. Unregistered EPIRBs have needlessly cost the lives of several mariners since the satellite system became operational.

What Happens To Your Registration Form?

The registration sheet you fill out and send in is entered into the U.S. 406 Beacon Registration Database maintained by NOAA/NESDIS. If your EPIRB is activated, your registration information will be sent automatically to the appropriate USCG SAR Rescue Coordination Center (RCC) for response. One of the first things the RCC watchstanders do is attempt to contact the owner/operator at the phone number listed in the database to determine if the vessel is underway (thus ruling out the possibility of a false alarm due to accidental activation or EPIRB malfunction), the intended route of the vessel if underway, the number of people on board, etc., from a family member. If there is no answer at this number, or no information, the other numbers listed in the database will be called to attempt to get the information described above needed to assist the RCC in responding appropriately to the EPIRB alert.

When RCC personnel contact the emergency phone numbers you provide, they will have all the information you have provided on the registration form. You should let these contacts know as much about your intended voyage as possible (i.e., intended route, stops, area you normally sail/fish/recreate, duration of trip, number of people going, etc.).  The more information these contacts have, the better prepared our SAR personnel will be to react. The contacts can ask the RCC personnel contacting them to be kept informed of any developments, if they so desire.

Registration Regulations

You may be fined for false activation of an unregistered EPIRB. The U.S. Coast Guard routinely refers cases involving the non-distress activation of an EPIRB (e.g., as a hoax, through gross negligence, carelessness or improper storage and handling) to the Federal Communications Commission. The FCC will prosecute cases based upon evidence provided by the Coast Guard, and will issue warning letters or notices of apparent liability for fines up to $10,000.

However, the Coast Guard has suspended forwarding non-distress activations of properly registered 406 MHz EPIRBs to the FCC, unless activation was due to hoax or gross negligence, since these search and rescue cases are less costly to prosecute.

If you purchase a new or a used 406 MHz EPIRB, you MUSTregister it with NOAA. If you change your boat, your address, or your primary phone number, you MUSTre-register your EPIRB with NOAA. If you sell your EPIRB, make sure the purchaser re-registers the EPIRB, or you may be called by the Coast Guard if it later becomes activated.

An FCC ship station license is no longer required to purchase or carry an EPIRB.

There Is No Charge For This Service. It May Save Your Life.

What is LRIT system


Long Range Identification and Tracking (LRIT) system is a Internation

al Maritime Organization (IMO) system designed for ship tracking – to collect and disseminate vessel position information received from IMO member States ships that are subject to the International Convention for SOLAS.

The United States Coast Guard (USCG) operates an International Data Exchange (IDE) in support of the international maritime community with vessel tracking of the marine traffic. The USCG maintains a National Data Center (NDC). The NDC monitors IMO member state ships that are 300 gross tons or greater on international voyages and either bound for a U.S. port or traveling within 1000 nm of the U.S. coast. LRIT complements existing classified and unclassified systems to improve Maritime Domain Awareness in ship tracking.

LRIT system consists of the ship borne LRIT information transmitting equipment, Communications Service Providers (CSPs), Application Service Providers (ASPs), LRIT Data Centers, including any related Vessel Monitoring System(s) (VMSs), the LRIT Data Distribution Plan (DDP) and the International LRIT Data Exchange. Certain aspects of the performance of the LRIT system for vessel tracking are reviewed or audited by the LRIT Coordinator acting on behalf of the IMO and its Contracting Governments. For more detailed information regarding U.S. LRIT rulemaking, please refer to the LRIT Final Rule, published in the Federal Register, Department of Homeland Security, 33 CFR Part 169, on Tuesday, April 29th, 2008 for ship tracking.