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Frequently
Asked Questions about SARSAT
Frequently Asked Questions
about…
(Click on a category below to find FAQ on that topic)
… about the Phase-out of
121.5 MHz Satellite Alerting
-121.5 MHz vs. 406 MHz Comparison Chart
Appendix A - Advantages of
406 MHz Beacon (especially ELTs)
Appendix B - History of 121.5 MHz Emergency Beacon Actions
... about Cospas-Sarsat
What is the Cospas-Sarsat Program?
The Cospas-Sarsat Program is
an international organization that provides space-based relay of distress
signals, or alerts, from 121.5 MHz and 406 MHz emergency beacons. Cospas-Sarsat provides the emergency
alerts to search and rescue (SAR) authorities internationally.
The
governments of
Cospas is a Russian acronym for “Space System for Search of Vessels in
Distress”
The web site www.cospas-sarsat.org contains more information on
the program.
What is the Cospas-Sarsat Secretariat?
The Cospas-Sarsat
Secretariat is the permanent administrative organ of the international program
responsible for assisting the Cospas-Sarsat Council in implementing the
Program. The Secretariat contains a
small, specialized and dedicated staff that assists in organizing meetings,
administering the international budget, and providing technical and operational
assistance.
When was the Cospas-Sarsat formed?
The first Cospas satellite launch was in 1982, during the same year
the first rescue using the system was recorded. The system was declared operational in
1985. At this time the four member
agencies of Cospas-Sarsat were working under a Memorandum of Agreement. As the program matured, it was decided
to have an intergovernmental agreement between the Governments of Canada,
Why is the National Oceanic and Atmospheric Administration (NOAA)
involved in Search and Rescue?
NOAA operates the nation’s civil environmental satellites. These satellites are used to monitor the
weather. These satellites also carry instruments that detect emergency
beacons. As NOAA operates the
satellites that carry search and rescue instruments and operates the equipment
to receive and process distress signals, it is the lead agency in the
Who are the other agencies involved with Cospas-Sarsat in the
Besides NOAA, the U.S. Air
Force Rescue Coordination Center (AFRCC) at Langley Air Force Base (http://www2.acc.af.mil/afrcc/) is
responsible for inland search and rescue coordination, the U.S. Coast Guard
responsible for maritime search and rescue (http://www.uscg.mil/hq/g-o/g-opr/sar.htm),
and the National Aeronautics and Space Administration (http://searchandrescue.gsfc.nasa.gov)
responsible for research and development are partners in the national
Cospas-Sarsat program.
... about Beacons

What is an EPIRB?
An EPIRB is an emergency
position-indicating radio beacon.
It is a device that can be automatically or manually activated to
transmit a distress signal to a satellite.
EPIRBs that activate automatically typically
have a hydro-static release mechanism that allows the beacon to release from
its bracket, float to the surface and start transmitting. The beacon, along with the bracket, has
to sink to approximately 3 meters before it can activate. This should be taken into account when
mounting an automatic type EPIRB.
EPIRBs transmit at either 121.5
MHz or 406 MHz. More information on
both frequencies is available under the “Phase
Out of 121.5 MHz Satellite Alerting” section below. 121.5 MHz EPIRBs
can either be Class A or Class B.
Class A EPIRBs can be
activated either manually or automatically, Class B EPIRBs
can only be activated manually. 406
MHz EPIRBs can either be Category I or Category II EPIRBs.
Category I EPIRBs can be activated either
manually or automatically, Category II EPIRBs can
only be activated manually.
Use of Class A and B EPIRBs will be discontinued in the near future. Please refer to the U.S. Coast
Guard’s Office of Search and Rescue homepage (http://www.uscg.mil/hq/g-o/g-opr/sar.htm)
for more information.
What are the differences in EPIRB Categories?
A Category I
EPIRB is one that is designed to be automatically activated when the beacon
sinks to a certain depth (anywhere from 12 – 15 feet below the surface)
or it can be manually activated. A
Category II EPIRB is one that can only be activated manually.
What is an ELT?
An ELT
is an emergency locator transmitter.
It is a device that can be automatically or manually activated to
transmit a distress signal to a satellite.
ELTs that activate automatically typically have a “G” or
gravity switch that triggers the ELT when it senses
that a crash has occurred. There
are several types of ELTs:
$ Automatic
Fixed ELTs are intended to be permanently attached to the aircraft before and
after a crash and are designed to aid search and rescue teams in locating a
crash site.
$ Automatic
Portable ELTs are intended to be rigidly attached to the aircraft before the
crash but readily removable from the aircraft after a crash
$ Survival
ELTs do not activate automatically and are intended to be removed from the
aircraft
$ Automatic
Deployable ELTs are intended to be rigidly attached to the aircraft before the
crash and automatically deployed after crash force sensor has determined that a
crash has occurred.
ELTs can transmit at either
121.5 MHz or 406 MHz, however satellite alerting of 121.5 MHz distress signals
will be discontinued starting in February, 2009. More information on both frequencies,
and on the phase-out of satellite alerting for 121.5 MHz ELTs is available
under the “Phase-Out of 121.5 MHz Satellite Alerting”
section below.
What is a PLB?
A PLB is a personal locator beacon designed to be carried by an
individual. They can only be
activated manually. PLBs can be
used by hikers, canoers, and other people operating in
remote areas.
What are the differences in beacon classes?
The only difference is the
operating temperatures. A Class 1
406 MHz emergency beacon is designed to operate between -40°C to
+55°C and a Class 2 406 MHz emergency beacon is designed to operate between
-20°C to +55°C.
How can I get in touch with my 406 MHz beacon
manufacturer?
A complete list of
Cospas-Sarsat approved manufacturers is provided at
http://www.cospas-sarsat.org/Beacons/beaconManufactureList.htm
Are 406 MHz PLBs legal for use in the
406 MHz PLBs have been
authorized for use by the Federal Communications Commission (FCC) starting
What is the difference between emergency beacons that operate at 121.5
MHz and those that operate at 406 MHz?
121.5 MHz beacons transmit
an analog signal that can only be detected by low-earth, or polar orbiting
satellites. The analog signal does
not contain any information about the beacon or its user. Alternatively, 406 MHz beacons transmit
a digital signal that contains information on the type of beacon and
owner. Additionally, 406 MHz
beacons can be linked to registration information that can provide search and
rescue forces valuable information when responding to a distress signal. More information on the difference
between 121.5 and 406 MHz beacons is available under the “Phase-Out of 121.5 MHz Satellite
Alerting” section below.
Click here to see a 121.5 MHz vs. 406 MHz Comparison Chart
What is the beacon identification code and where can I find it on the
beacon?
The beacon
ID, also referred to as the Unique Identification Number (UIN)
is comprised of 15 hexadecimal characters.
Hexadecimal characters are made of numbers (0 through 9) and the letters
A, B, C, D, E and F. Please note
that the letter “O” as in “Oscar” and the letter
“I” as in “
What is the Unique Identifier Number (UIN)?
The UIN is the same as the beacon ID, see above.
How do I test my emergency beacon?
That depends on the type of
beacon you own. You can test your
121.5 MHz ELTs only during the first five (5) minutes after any hour and you
may only activate the ELT for three audible
sweeps. If operational tests must
be made outside of this period, they should be coordinated with the nearest FAA
Control Tower or FSS. If the antenna is removable, a dummy
load should be substituted during test procedures. In any case airborne tests are not
allowed.
406 MHz emergency beacons should
never be activated unless you are in grave and eminent danger. 406 MHz emergency beacons should only be
tested using the “self-test” feature of the beacon or the beacon
should be taken to an authorized dealer or test facility. A list of U.S. Coast Guard units that
can test your 406 MHz beacon can be found at www.uscg.mil/hq/g-m/cfvs. Look under EPIRB information.
The International Maritime
Organization has published guidelines for annual testing of 406 MHz EPIRBs that might be of use of beacon owners in
general. Some of the relevant
guidelines state that an examination of an installed 406 MHz beacon should
include:
$ checking
the position and mounting of automatically activated EPIRBs
and ELTs;
$ carrying
out a visual inspection for defects;
$ carrying
out the self-test routine;
$ ensuring
that the beacon ID is clearly marked on the outside of the beacon;
$ checking
the battery expiry date; and
$ checking the hydrostatic release and its expiry date for
automatically activated EPIRBs.
Do I need to inspect my ELTs, and how often?
Yes, you must inspect your ELT once a year.
Each ELT must be inspected for proper
installation, battery corrosion, operation of the controls and crash sensor,
and the presence of a sufficient signal radiated from its antenna.
Why can’t I register a 121.5 MHz emergency
beacon?
406 MHz emergency beacons
have a unique identifier that allows us to link the emergency beacon to
registration information. A 121.5
MHz emergency beacon transmits an analog signal that does not contain any
information. Therefore, there is no
way to register the beacon.
Who is required to carry an ELT?
In general,
all
Who is required to carry a 406 MHz EPIRB?
In general,
Is there any guidance on how to use 406 MHz EPIRBs?
You should always follow the
manufacturer’s instructions when using or testing your EPIRB. In general an EPIRB should be placed in
the water and tethered to the survival craft. EPIRBs which
are not meant to float in water should be placed in the survival craft in a
vertical position with the antenna clear of all obstacles, including your self
and others in the survival craft.
If your EPIRB has a GPS interface you should ensure that the EPIRB is
outside enclosures, such as a carbon-fiber vessel hull, which could prevent
acquisition of navigational satellite signals by the GPS.
What is a false alert?
A false alert is an
activation of an emergency beacon in a non-distress situation. Examples of false alerts include
accidentally turning on an emergency beacon, improperly testing a beacon or
incorrectly mounting an emergency beacon so that it falls out of its bracket
and activates.
What can I do to reduce false alerts?
You have the primary
responsibility to prevent false alerts.
You should ensure that you only activate an emergency beacon in
situations of grave and imminent danger.
You should also follow the manufacturer’s instructions for testing
your beacon. Lastly you should
ensure that automatically activated beacons are properly mounted so that a
simple “bump” will not cause them to fall out of their bracket and
activate.
ELTs
Caution should be exercised
to prevent the inadvertent activation of ELT's in the
air or while they are being handled on the ground. Accidental or unauthorized activation
will generate an emergency signal that cannot be distinguished from the real
thing, leading to expensive and frustrating searches. A false ELT signal could also interfere with genuine emergency
transmissions and hinder or prevent the timely location of crash sites. Frequent false alarms could also result
in complacency and decrease the vigorous reaction that must be attached to all ELT signals.
Numerous cases of
inadvertent activation have occurred as a result of aerobatics, hard landings,
movement by ground crews and aircraft maintenance. These false alarms can be
minimized by monitoring 121.5 MHz and/or 243.0 MHz as follows:
(a) In flight
when a receiver is available.
(b) Before
engine shut down at the end of each flight.
(c) When the ELT is handled during installation or maintenance.
(d) When
maintenance is being performed near the ELT.
(e) When a
ground crew moves the aircraft.
(f) If an ELT signal is heard (sounds like a siren), turn off the
aircraft's ELT to determine if it is
transmitting. Newer ELTs have a cockpit
mounted switch; however you will need access to the unit itself if it’s
an older model. If it has been
activated, maintenance might be required before the unit is returned to the
"ARMED" position. You should contact the nearest Air Traffic facility
or Flight Service Station (FSS) 1-800-WXBRIEF and
notify them of the inadvertent activation.
Maintain your ELT regularly.
Low batteries can cause erroneous signals and generate false
alarms. Conversely, false alarms
can cause low batteries. So, make sure you've got strong batteries in your ELT.
EPIRBs
Always test your EPIRB in
strict accordance with the manufacturer’s recommendations. Most EPIRB
activation switches have a test position.
This test position allows the entire unit (electronics, battery, and
antenna) to be tested without generating a false alarm. Ensure that your beacon is registered
with NOAA. This does nothing to reduce false alarm rates, but does have a
dramatic effect on the impact of a false alarm. If the EPIRB is properly
registered, the situation will be resolved with a phone call. It will also help
speed rescue in an actual distress.
Affix your
proof-of-registration decal on the EPIRB so it can be easily read without
taking the EPIRB out of its bracket. A surprising amount of false alarms are
generated by people (sometimes Coast Guard safety inspectors) doing so to check
the decal. Never remove the EPIRB
from its bracket without first switching it to the "OFF" position
(unless of course, you're actually in distress). Also, never allow it to be
removed by others. A lot of false alarms are generated by curious passengers.
Another common source of false alarms is from crew members removing the EPIRB
to paint behind it.
Maintain your EPIRB. Ensure
that the batteries are within their expiration date and that all manufacturer
recommendations are followed. Any
time that the EPIRB is not on the vessel, it should be switched “OFF.”
Finally, realize that the
Cospas-Sarsat satellites are very good at what they do...detecting emergency
beacons. Activation of any 406 MHz
beacon, even for just a few seconds, will usually be detected.
What should I do if I have accidentally activated my emergency beacon?
If for any reason your
beacon is activated accidentally you should contact the appropriate rescue
coordination center, Air Traffic facility or Flight Service Station (FSS) 1-800-WXBRIEF . In the
How can I dispose of my emergency beacon?
You should ensure that when
your beacon needs to be disposed of (for example when its damaged or when a
ship is sold for scrap) it should be made inoperable, either by removing its
battery and, if possible, returning it to the manufacturer, or by demolishing
it. If a beacon is to be returned
to the manufacturer with the battery still installed, it should be wrapped in
tin foil to prevent transmission of signals during shipment. Please inform the NOAA/USMCC if you sell
or dispose of a registered 406 MHz beacon.
If I’m a pilot should I monitor for 121.5 MHz
signals?
Yes. Pilots are encouraged to monitor 121.5
MHz and/or 243.0 MHz while in flight to assist in identifying possible
emergency ELT transmissions. On receiving a signal,
report the following information to the nearest air traffic facility:
(a) Your
position at the time the signal was first heard.
(b) Your
position at the time the signal was last heard.
(c) Your
position at maximum signal strength.
(d) Your flight
altitudes and frequency on which the emergency signal was heard: 121.5 MHz or
243.0 MHz. If possible, positions
should be given relative to a navigation aid. If the aircraft has homing
equipment, provide the bearing to the emergency signal with each reported
position.
How do I maintain my beacon?
All beacons need to be
tested and serviced for water tightness, the battery, external damage and
signal strength. Beacons should be
serviced whenever the battery needs replacing. Usually the manufacturer or distributor
services the beacon.
… about Beacon Registration
Who has to register a 406 MHz emergency beacon?
All 406 MHz emergency beacon
owners/operators are required to register their 406 MHz emergency beacon (ELTs
and EPIRBs) with NOAA’s
SARSAT program. This is a
requirement from the Federal Communications Commission (FCC). The following web site contains more
information on the regulation www.access.gpo.gov., look under
Title 47 - Telecommunication.
How can I register my 406 MHz EPIRB, ELT or
PLB or update my information?
There are several ways to
register you 406 MHz beacon with NOAA.
You may send the registration card or information to the address below
or fax it to (301) 817-4565:
Beacon Registration
NOAA/NESDIS,
NSOF, E/SP3
Alternatively, you can save
time and money, and improve the accuracy of the information you provide by
registering your beacon via the Internet at www.beaconregistration.noaa.gov
How do I update by beacon registration information?
You
can now go to www.beaconregistration.noaa.gov
and make the update. If you have
not previously accessed your beacon registration using the internet, you need
to choose the 2nd option (Access Beacon Previously Registered By Mail).
Does NOAA automatically send of Proof-of-Registration decals and
confirmation reports?
Yes. You should receive a
Proof-of-Registration decal when you initially register your beacon and when
you confirm your registration information every two years. In either case, the decal is sent to the
postal address listed on the registration.
Are there times when I will receive a Proof-of-Registration decal even
though it hasn’t been two years since I registered, or last updated my
information?
Yes, this can happen when
you change or update your information.
Depending on the type of beacon you have, a new proof-of-registration
decal will be sent in the following cases:
EPIRB: When
you update the vessel name
When
you select the renew registration option
ELT: When
the tail number on the aircraft has changed
When
you select the renew registration option
PLB: When
the owner name changes
When
you select the renew registration option
Or, you’ll receive a
new decal when you select the “Replace Decal” option on the
web-based registration system.
How long is my registration information valid in the NOAA registry?
The registration
information, and the corresponding proof-of-registration decal, is valid for
two years. The FCC requires that
you renew your registration every two years. However, you are encouraged to provide
updates to your registration anytime it’s required.
Do I need a ship station license or a documentation number to register
an EPIRB?
You do not need a ship
station license or a documentation number to register an EPIRB.
How can I contact the Federal Communications
Commission (FCC)?
They can be reached
at (888) 225-5322 or at www.fcc.gov.
To whom is my 406 MHz emergency beacon registration information
released?
The registration information
is only released to search and rescue authorities such as the U.S. Coast Guard
and the U.S. Air Force. In certain
cases NOAA may release your registration information to beacon manufacturers or
service agents so that they may send you urgent service announcements.
NOAA, under the Privacy Act
of 1974 (as amended), is required to adopt minimum standards for the collection
and processing of personal information and to publish detailed descriptions of
these procedures. The Privacy Act
also limits the making of such records available to other public and private
agencies or parties. Lastly, it
requires agencies to make records on individuals available to them upon
request, subject to certain conditions and exclusions.
The Privacy Act has four
basic policy objectives:
$ to
restrict disclosures of personally identifiable records;
$ to
grant individuals more rights to access records agencies maintain on them;
$ to
grant individuals the right to seek amendments to agency records maintained on
themselves; and
$ to establish a code of "fair information
practices" which requires agencies to comply with statutory norms for
collection, maintenance, and dissemination of records.
What happens if I do not register by 406 MHz emergency beacon?
The System will still work
but rescue could be delayed. The
Cospas-Sarsat System is designed to provide both identification and location
information. Identification information
can be provided two ways: (1) information such as the radio call sign or
aircraft tail number can be encoded into the 406 MHz emergency beacon and/or
(2) the 406 MHz emergency beacon can be registered in a national registration
database such as the one NOAA maintains.
As long as the System is
able to obtain a position (either using Doppler processing or through the use
of new beacons that can transmit their position as part of the 406 MHz message)
search and rescue personnel can respond to a distress signal. However, when a position is not
available the search and rescue personnel have to rely on registration
information. It’s in these
cases that rescue could be delayed until the System can obtain a position. Even with a position, the response may
be delayed until the search and rescue personnel try to determine the nature of
the distress, and their capability to respond to the location of the
distress. The response would also
vary country by country. NOAA
recommends that you try to list two contacts, one of which, the search and
rescue personnel would be able to reach at any time of the day.
What can I do if I have a 406 MHz emergency beacon coded for a country
that does not maintain a 406 MHz emergency beacon registration database?