epirb false alert rate 2009 bmw
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8/2/2019 EPIRB False Alert Rate 2009 BMW
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 11
406 MHz EPIRBFalse Alerts
Cause and Prevention
of False Alerts,an Update
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 22
Why does US Coast Guard
care aboutEPIRB False Alerts?
• 96% 406 MHz EPIRB Alerts are false
• 85% Resolved by RCCs withregistration and good detective work
• Increase in EPIRB population isbringing an increase in number offalse alerts
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 33
Why does US Coast Guardcare about
EPIRB False Alerts?• $4 million in A/C time and fuel on
406 MHz EPIRB false alerts in 2008
• SAR crews put at risk
• SAR assets less available for actual distress• Fatigues and dulls the SAR system
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 44
406 MHz DF
• The US Coast Guard now has capability to
DF on 406 EPIRB signal.• Taking the Search out of EPIRB Distress
cases.
• DF not solving False Alert Problem.
Why?
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 55
How Long does a
False Alerts Last?
105 36 20 12 9 2 48
45.3%
60.8%69.4%
74.6% 78.4% 79.3%
100.0%
0
20
40
60
80100
120
10 20 30 40 50 60 More
Alert Duration (in minutes)
N u m b
e r o f A l e
r t
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 66
Operator Induced False Alerts• 10% were attributed to Testing
without following manufacturesinstructions, or other deliberate non-
emergency activations• 6% (13) were EPIRBs deliberately
taken out of bracket and naked of anycontrol of the wet sensor
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 77
False Alert and
EPIRB in Bracket95
35
15
4
2622
Wet Bumped Knocked out Icing Heavy
Weather
Washing
1 6 1
A l e r t s
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 88
EPIRB False Alerts
69% (161) Caused by Failure of “The
bracket decoupling function” tocontrol the EPIRB
– Observed with Category I and II
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 99
EPIRB False Alerts
69% (161) Activated whenbracket should have prevented
activationFailure of “The bracket
decoupling function” to controlthe EPIRB
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 1010
Bracket problems observed infield by Coast Guard personnel
• Loose straps or mechanical holdingdevice
• Missing pads or guides to holdbeacons in place
• Missing or corroded magnets
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 1111
Bracket problems observed infield by Coast Guard personnel
(continued)• Beacons being placed improperly in
brackets by users• Brackets not mounted in accordance
with manufactures recommendations
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 1212
RTCM Standard 11000.2
2.3.1.1
“The satellite EPIRB should not beaccidentally activated or deactivated
by conditions normally encountered inthe maritime environment.”
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 1313
RTCM Standard 11000.2
2.3.1.2“The bracket decoupling function will guard
against false alarms should the water-activationmechanism malfunction to an “on” mode. It willalso prevent inadvertent activation due to the
water activation mechanism becoming wet dueto heavy seas or rain. …
Both Category 1 and Category 2satellite EPIRBs should have these
features.”
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 1414
EPIRB Operational
RequirementsNot be activated or deactivated by conditions
encountered in maritime environment69% Of
False Alerts
BracketInterface Failure
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 1515
Prevention of InadvertentActivation
• Must be fitted with means to prevent
inadvertent activation and deactivation.• Not automatically activate when water
washes over while in bracket.• Most EPIRBs use bracket with magnet to
disable activation circuit.
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May 2009 L. T. Yabrough, U.S. Coast GuardL. T. Yabrough, U.S. Coast Guard 1616L. T. Yabrough, USCG, D7(dpi)L. T. Yabrough, USCG, D7(dpi)
EPIRB as a SystemCurrent Shore Based Maintenance for
EPIRBs does not routinely examinethe Bracket, (IMO MSC/Circ.1039)
Require or at least encourage thebracket to be included in an EPIRB
service
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May 2009 L. T. Yabrough, U.S. Coast GuardL. T. Yabrough, U.S. Coast Guard 1717L. T. Yabrough, USCG, D7(dpi)L. T. Yabrough, USCG, D7(dpi)
EPIRB Testing
IMO MSC/Circ.1040, Guidelines on
Annual Testing of 406 MHz SatelliteEPIRBs, and manufacture’s self test
guidelines should be reassessed fordetection of bracket failure
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May 2009 L. T. Yabrough, U.S. Coast GuardL. T. Yabrough, U.S. Coast Guard 1818
What can Beacon
Manufactures Do?
• Have Beacon Service Centers request bracketwhen beacon submitted for service.
• Check the bracket.
• Is the beacon – bracket interface functioning asdesigned?
• Help beacon owners with education• Help beacon owners submit new Registration.
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May 2009 L. T. Yabrough, U.S. Coast GuardL. T. Yabrough, U.S. Coast Guard 1919
What can Beacon
Manufactures Do?
• Look at the feedback data fromNOAA/SARSAT on false alerts for each of
your beacons.
• Should you impose a Life Cycle on your
beacons?
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May 2009 L. T. Yabrough, U.S. Coast GuardL. T. Yabrough, U.S. Coast Guard 2020
Feedback
• NOAA/SARSAT - Improve feedback
mechanism to Beacon manufactures thatprovides as much detail as possible about:
– exactly which Beacons have generated aFalse Alert. And
– circumstances surrounding the event.
– Consider providing IHDB access, or a limitedand redacted version that excludes protectedpersonal data.
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May 2009 L. T. Yabrough, U.S. Coast GuardL. T. Yabrough, U.S. Coast Guard 2121
False Alerts
False Alerts are a drain on the health of
the EPIRB Distress Alerting SystemThere is no one cause of EPIRB False
Alerts, and there is no one fix for theproblem However …
Several small corrective steps willmake a positive difference in thisproblem
8/2/2019 EPIRB False Alert Rate 2009 BMW
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May 2009 L. T.L. T. YabroughYabrough, U.S. Coast Guard, U.S. Coast Guard 2222
Questions?
Larry.T.Yarbrough@uscg.mil(305) 415 6868
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