406 MHz EPIRB False Alerts Study NOAA/SARSAT Conference 2010
406 MHz EPIRB False Alerts Study. EPIRB False Alerts Study Study was research project by: Larry...
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Transcript of 406 MHz EPIRB False Alerts Study. EPIRB False Alerts Study Study was research project by: Larry...
![Page 2: 406 MHz EPIRB False Alerts Study. EPIRB False Alerts Study Study was research project by: Larry Yarbrough, USCG District 7 (dpi) Newton Anderson, USCG.](https://reader037.fdocuments.in/reader037/viewer/2022110320/56649cae5503460f94970c76/html5/thumbnails/2.jpg)
EPIRB False Alerts Study
Study was research project by:
Larry Yarbrough,
USCG District 7 (dpi)
Newton Anderson,
USCG Auxiliary
![Page 3: 406 MHz EPIRB False Alerts Study. EPIRB False Alerts Study Study was research project by: Larry Yarbrough, USCG District 7 (dpi) Newton Anderson, USCG.](https://reader037.fdocuments.in/reader037/viewer/2022110320/56649cae5503460f94970c76/html5/thumbnails/3.jpg)
Why does US Coast Guard care about
EPIRB False Alerts?
• 96% 406 MHz EPIRB Alerts are false• 85% Resolved by RCCs with
registration and good detective work• Projected increase in EPIRB
population will bring increase in number of false alerts
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Why does US Coast Guard care about
EPIRB False Alerts?• $3.6 million in A/C time and fuel on
406 MHz EPIRB false alerts in 2007 • SAR crews put at risk• SAR assets less available for actual
distress• Fatigues and dulls the SAR system
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EPIRB False Alerts Study
• Study data limited to:– US Registered 406 MHz EPIRBs – transmitting a 406 MHz False Alert– where secondary data collection was
accomplished, through RCC telephone interview of vessels owner or operator at the time of the alert
• Study Population came from all USMCC alerts passed to US Coast Guard RCCs
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EPIRB False Alerts
• 1 May - 31 Dec 2007
• USMCC received 1577 406 MHz EPIRB alerts
• 5% (83) were Distress Alerts
• 1494 False Alerts (non-distress and ceased/undetermined alerts)
![Page 8: 406 MHz EPIRB False Alerts Study. EPIRB False Alerts Study Study was research project by: Larry Yarbrough, USCG District 7 (dpi) Newton Anderson, USCG.](https://reader037.fdocuments.in/reader037/viewer/2022110320/56649cae5503460f94970c76/html5/thumbnails/8.jpg)
EPIRB False Alerts
• 1494 False Alerts (non-distress and ceased/undetermined alerts)
• 15% - (232) Were False Alerts with enough data collected to develop evidence of circumstances causing alert transmission
![Page 9: 406 MHz EPIRB False Alerts Study. EPIRB False Alerts Study Study was research project by: Larry Yarbrough, USCG District 7 (dpi) Newton Anderson, USCG.](https://reader037.fdocuments.in/reader037/viewer/2022110320/56649cae5503460f94970c76/html5/thumbnails/9.jpg)
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
80
100
120
10 20 30 40 50 60 More
Alert Duration (in minutes)
Nu
mb
er
of
Ale
rts
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EPIRB False Alerts
• 232 - False Alerts with enough data collected to develop evidence of circumstances causing alert transmission
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Operator Induced False Alerts
• 10% (24) were attributed to Testing without following manufactures instructions, or other deliberate non-emergency activations
• 6% (13) were EPIRBs deliberately taken out of bracket and naked of any control of the wet sensor
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Bracket Water Testing
04/18/2304/18/23 L. Yarbrough/D7CFVSL. Yarbrough/D7CFVS
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False Alert and EPIRB in Bracket
95
35
154
26 22
Wet Bumped Knocked out Icing HeavyWeather
Washing
161
Ale
rts
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EPIRB False Alerts
69% (161) Caused by Failure of “The bracket decoupling function” to control the EPIRB–Observed with Category I and II–Manufactures, makes and models
in the US registration data base were proportionally represented by False Alerts
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EPIRB False Alerts
69% (161) Activated when bracket should have prevented activation
Failure of “The bracket decoupling function” to control the EPIRB
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Bracket problems observed in field by Coast Guard personnel
• Loose straps or mechanical holding device
• Missing pads or guides to hold beacons in place
• Missing or corroded magnets
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Bracket problems observed in field by Coast Guard personal
(continued)• Beacons being placed improperly in
brackets by users
• Brackets not mounted in accordance with manufactures recommendations
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EPIRB Operational Requirements
Not be activated or deactivated by conditions encountered in maritime environment
69% Of False Alerts
Bracket Interface Failure
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False Alerts
False Alerts are a drain on the health of the EPIRB Distress Alerting System
There is no one cause of EPIRB False Alerts, and there is no one fix for the problem However …
Several small corrective steps will make a positive difference in this problem
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Scrambled HexID Codes
• USMCC alerts with invalid HexID code starting with 21, 22, or 23.
• Older models of ACR EPIRBs will repeat 406 MHz transmissions if switch is left in Test Position.
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Scrambled example
• UNREG HEX CODE RECEIVED:
23DE1 42C01 8DC01
ADD : ADCD0 23DE1 42C01 XXXXX
Look up new code in RGDB, if there happens to be a vessel
with this beacon, and it’s an ACR beacon, there is a possibility it’s a test signal that could be an EPIRB held in the test mode, and a real SAR case. This could save you a lot of time.
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Scrambled HexID Codes
• Code received by USMCC = 23DE1 42C01 89645
• Add ADCD0 as first 5 digits of HexID.
• Drop last five (89645).
• Check new code (ADCD0 23DE1 42C01) against NOAA registration data base.
• Use results from Registration Data base with great care.
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Scrambled HexID Codes
• Use results with Great Care.
• Until you have confirmed the beacon you identified in the RGDB:– is going off is in a location that correlates with
the A or B solution, – and there is no distress,
you must treat with the same care and concern as all other unregistered Alerts.
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Questions?
(305) 415 6868
04/18/2304/18/23 L. Yarbrough/D7CFVSL. Yarbrough/D7CFVS