GMDSS
STATISTICS
These statistics from the USCG Atlantic Area RCC refer to the
number of distress alert cases (e.g. ships sending the alert),
not the number of alerts received. The USCG routinely
receives numerous distress alerts, especially DSC alerts, from
the ship sending the alert as well as relays of that alert from
other ships. Those numerous extraneous alerts and relays
are not included in the RCC statistics reported below.
The USCG is not collecting similar statistics from the Pacific
Area.
The documents below are Excel spreadsheets in Acrobat PDF
format. Information includes numbers of real and false
alerts, alerts having invalid identities, invalid positions,
and no position information. Systems for which statistics
are collected include MF/HF DSC, Inmarsat A, B, C, and E (EPIRB).
Statistics concerning COSPAS-SARSAT EPIRB alerts are collected
by NOAA. The AMVER Rescue Summary Experience
provides statistics on actual distress alerts by means of
alert, including both GMDSS and means, during the period 1996-1999,
in both Atlantic and Pacific Areas.
USCG Atlantic Area
(Statistics from Jan
2000 - Dec 2002 have been relocated)
- GMDSS Statistics Totals 1996 - 2000
(Jan 01)
DSC Distress Statistics
GMDSS Statistics Total of the USCG Atlantic Area available
above shows a significant reduction in the number and rate
of false alerts during 2000. The false alert rate for
HF DSC was comparable to other GMDSS systems, including 406
MHz EPIRBs.
USCG radio watchstanders and ship operators had been overwhelmed
by the number of inappropriately transmitted all-ship DSC
distress relays. The USCG issued a notice to mariners in an attempt to
reduce the numbers of relays. The average number of
relays for each distress message transmitted was subsequently
reduced significantly.
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