EPIRB's are self contained transmitters which emit distress and location information over the 406 MHz radio frequency. 406 EPIRBs have a unique code which identifies the sender.

According to sources, the orbiting SAR satellites are able to calculate the position of the EPIRB's position to within 2 nautical miles. EPIRB's may also be interfaced with the vessel's on board GPS unit or be equipped with an integral GPS unit. Units with GPS can transmit position information that is accurate within a few feet.

EPIRB owners should register their unit to comply with regulations and to help rescue authorities in the event of an emergency. Registering helps identify and locate you should deployment ever be necessary.

From NOAA......"Registration of 406 MHz emergency beacons is mandatory and only valid for two years. You are required to re-register your beacon with NOAA in two years. We will email or fax you a request for confirmation approximately two months prior to the expiration of your beacon registration."

Visit this site to register: www.beaconregistration.noaa.gov

EPIRB Glossary

Class A & B EPIRB - obsolete EPIRB units that used 121.5 and 243.0 Mhz

Category I EPIRB - These units have a bracket which automatically deploy when the device reaches a depth of 3-14'.

Category II EPIRB - These units are manually released and activated.

Internal GPS EPIRB - Unit contains a GPS unit which greatly increases the accuracy of the position information that is sent to rescue authorities.

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