Sea Ledger, February 2011

2011-02-01 to 2011-02-28 · archive

issued: 352
warning-days in force: 6,540
in force at month end: 225
sea × type cells: 190

baseline: same month, previous 5 years (2010-02, 2009-02, 2008-02, 2007-02, 2006-02)

By type

type	issued	warning-days	in force at end
Incidents	54	942.4	25
Exercises	53	564.7	25
Nav aids	46	1,166.8	39
Cable ops	46	641.9	26
Quakes	39	110.6	5
Missiles	30	247.2	9
Piracy	27	290.6	8
Derelicts	14	26.9	4
Surveys	10	1,452.4	51
Other	6	284.1	9
Ordnance	6	127.4	2
Debris	5	17.2	0
Structures	4	25.8	1
Containers	4	10.2	2
Icebergs	3	9	0
Spills	3	60	1
Restricted	1	63.9	2
Wrecks	1	470.8	15
Volcanic	0	28	1

By sea and type · 190 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Piracy · Arabian Seasurge	21	187.9	6	37	105× / 0.2
Cable ops · South Atlantic Oceanlong running	20	153.3	6	842	1.3× / 16
Quakes · South Pacific Ocean	20	57.2	2	28	1.1× / 18.4
Missiles · North Pacific Oceansurge	10	94.2	5	58	2.1× / 4.8
Incidents · North Atlantic Ocean	9	242.2	7	70	2.0× / 4.6
Incidents · North Pacific Ocean	9	43.3	1	40	1.4× / 6.2
Exercises · Japan Seasurge	8	62.8	2	33	2.4× / 3.4
Exercises · Arabian Sea	7	61.3	3	32	1.8× / 4
Cable ops · North Atlantic Ocean	7	59.2	1	73	1.6× / 4.4
Exercises · North Pacific Ocean	7	52	2	32	0.7× / 9.6
Incidents · South China Seasurge	6	149.4	3	63	2.0× / 3
Nav aids · Coral Seasurge	5	45.4	0	—	2.1× / 2.4
Nav aids · North Pacific Oceansurge	5	39.9	3	63	6.3× / 0.8
Exercises · Yellow Sea	5	37	1	33	1.4× / 3.6
Incidents · South Atlantic Ocean	5	32	1	22	0.8× / 6
Exercises · South Pacific Oceansurge	5	18.2	0	—	2.8× / 1.8
Missiles · North Atlantic Oceansurge	5	15.7	1	18	5.0× / 1
Derelicts · Indian Oceansurge	5	10.8	0	—	5.0× / 1
Derelicts · South Atlantic Oceansurge	5	8.1	2	14	3.6× / 1.4
Nav aids · South Atlantic Oceanlong running	4	241.5	9	922	1.5× / 2.6
Nav aids · North Atlantic Ocean	4	65	2	320	1.1× / 3.8
Nav aids · Inner Seas off the West Coast of Scotlandsurge	4	50.5	1	142	5.0× / 0.8
Surveys · South Atlantic Oceansurge	4	45.6	1	33	2.9× / 1.4
Missiles · South Pacific Oceannew	4	30.5	1	28	new / 0
Exercises · South China Seasurge	4	28.2	4	9	3.3× / 1.2
Incidents · South Pacific Ocean	4	26.9	2	39	0.7× / 5.6
Quakes · North Pacific Ocean	4	12	0	—	1.2× / 3.4
Incidents · Coral Sea	4	3.8	0	—	1.5× / 2.6
Nav aids · North Sea	3	204.2	4	347	0.4× / 7
Cable ops · Arabian Sea	3	84	3	137	1.1× / 2.6
Cable ops · Gulf of Mexicosurge	3	47.8	2	107	5.0× / 0.6
Incidents · Arabian Seasurge	3	46.5	1	40	3.8× / 0.8
Exercises · Bay of Bengal	3	42.4	2	33	0.4× / 6.8
Cable ops · Bay of Bengal	3	39.5	3	32	1.3× / 2.4
Piracy · Indian Oceannew	3	37.1	0	—	new / 0
Exercises · Philippine Sea	3	33.6	1	24	1.5× / 2
Structures · North Seanew	3	25	1	23	new / 0
Missiles · Bay of Bengalsurge	3	18.2	0	—	15× / 0.2
Ordnance · Arabian Seasurge	3	11	0	—	15× / 0.2
Quakes · Coral Seasurge	3	8.9	1	24	3.0× / 1
Nav aids · Gulf of Mexico	3	3.7	0	—	1.9× / 1.6
Nav aids · Irish Sea and St. George's Channel	3	3.4	1	27	1.7× / 1.8
Nav aids · Great Australian Bightsurge	3	1.7	0	—	3.0× / 1
Cable ops · Mediterranean Sea - Eastern Basin	2	86.8	3	77	0.8× / 2.6
Incidents · Bay of Bengal	2	69.6	1	47	2.0× / 1
Incidents · Caribbean Sea	2	39.9	2	64	2.5× / 0.8
Exercises · Laccadive Sea	2	30.3	1	32	0.4× / 5.6
Nav aids · English Channel	2	24.7	1	20	0.7× / 3
Cable ops · Makassar Straitnew	2	23.1	1	23	new / 0
Missiles · Barentsz Seanew	2	22.2	1	31	new / 0
Ordnance · Persian Gulfnew	2	11.4	0	—	new / 0
Exercises · Coral Sea	2	9.2	0	—	10× / 0.2
Exercises · South Atlantic Ocean	2	7.7	1	9	0.5× / 4
Other · Coral Seanew	2	7.1	0	—	new / 0
Nav aids · Tasman Sea	2	6.6	1	15	10× / 0.2
Exercises · Mediterranean Sea - Eastern Basin	2	6.3	1	14	0.9× / 2.2
Quakes · Celebes Sea	2	6	0	—	10× / 0.2
Containers · North Atlantic Ocean	2	6	0	—	0.5× / 4
Cable ops · South Pacific Ocean	2	5.9	1	5	5.0× / 0.4
Derelicts · Arabian Sea	2	3.5	1	4	3.3× / 0.6
Incidents · Tasman Sea	2	3.3	0	—	1.3× / 1.6
Nav aids · Bass Strait	2	0.4	0	—	3.3× / 0.6
Nav aids · South Pacific Oceanlong running	1	144.8	6	410	0.6× / 1.6
Exercises · Aegean Sea	1	142.2	5	60	0.5× / 2.2
Other · Mediterranean Sea - Eastern Basinlong running	1	96.4	2	412	5.0× / 0.2
Incidents · Gulf of Mexico	1	81.6	2	49	5.0× / 0.2
Other · Persian Gulf	1	62.6	3	195	1.3× / 0.8
Nav aids · Indian Ocean	1	57.4	2	64	0.8× / 1.2
Incidents · Mozambique Channel	1	43.8	1	68	1.7× / 0.6
Ordnance · North Sealong running	1	42.2	1	850	5.0× / 0.2
Nav aids · Caribbean Sea	1	37.8	0	—	5.0× / 0.2
Exercises · North Atlantic Ocean	1	33	1	30	0.5× / 2
Incidents · Indian Ocean	1	29.1	2	32	0.4× / 2.4
Cable ops · Persian Gulf	1	28.9	1	47	1.0× / 1
Surveys · Mozambique Channel	1	28	1	80	new / 0
Incidents · Persian Gulf	1	25.8	1	25	1.7× / 0.6
Spills · Gulf of Alaska	1	21	0	—	2.5× / 0.4
Cable ops · North Pacific Ocean	1	18.5	1	18	new / 0
Spills · Gulf of Mexico	1	18	1	29	0.2× / 4.2
Incidents · Andaman or Burma Sea	1	14.2	0	—	new / 0
Spills · Bering Sea	1	14	0	—	5.0× / 0.2
Surveys · Irish Sea and St. George's Channel	1	10.5	1	10	2.5× / 0.4
Piracy · South China Sea	1	10.3	1	34	2.5× / 0.4
Cable ops · Tasman Sea	1	10	1	29	5.0× / 0.2
Surveys · Bay of Bengal	1	9.5	0	—	2.5× / 0.4
Piracy · Gulf of Aden	1	9.3	1	9	0.8× / 1.2
Piracy · Red Sea	1	9.2	0	—	new / 0
Restricted · South Atlantic Ocean	1	7.9	0	—	new / 0
Nav aids · Laccadive Sea	1	7.6	1	7	5.0× / 0.2
Missiles · South Atlantic Ocean	1	7.6	0	—	5.0× / 0.2
Missiles · Southern Ocean	1	6.8	0	—	new / 0
Incidents · Southern Ocean	1	6.7	1	6	1.3× / 0.8
Missiles · Laccadive Sea	1	6.1	0	—	new / 0
Missiles · Arctic Ocean	1	6	0	—	new / 0
Other · Tasman Sea	1	5.4	0	—	5.0× / 0.2
Nav aids · Bay of Bengal	1	4.9	0	—	1.7× / 0.6
Surveys · Mediterranean Sea - Eastern Basin	1	4.9	0	—	0.4× / 2.4
Surveys · North Sea	1	4.7	0	—	5.0× / 0.2
Missiles · Indian Ocean	1	4.4	0	—	1.0× / 1
Missiles · Coral Sea	1	3.8	0	—	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	3.3	0	—	1.0× / 1
Quakes · Andaman or Burma Sea	1	3	0	—	new / 0
Debris · Arabian Sea	1	3	0	—	new / 0
Quakes · Banda Sea	1	3	0	—	1.3× / 0.8
Containers · Caribbean Sea	1	3	1	2	2.5× / 0.4
Quakes · Gulf of Alaska	1	3	0	—	new / 0
Quakes · Gulf of Mexico	1	3	0	—	new / 0
Debris · Indian Ocean	1	3	0	—	new / 0
Quakes · Indian Ocean	1	3	0	—	0.3× / 3.8
Icebergs · Indian Ocean	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	new / 0
Quakes · Molukka Sea	1	3	0	—	0.5× / 2
Quakes · North Atlantic Ocean	1	3	0	—	1.0× / 1
Icebergs · North Atlantic Ocean	1	3	0	—	0.6× / 1.6
Debris · Philippine Sea	1	3	0	—	5.0× / 0.2
Quakes · Solomon Sea	1	3	0	—	0.6× / 1.6
Debris · South Pacific Ocean	1	3	0	—	5.0× / 0.2
Icebergs · South Pacific Ocean	1	3	0	—	5.0× / 0.2
Debris · Tasman Sea	1	3	0	—	new / 0
Derelicts · North Atlantic Ocean	1	1.5	1	1	0.4× / 2.8
Containers · South Atlantic Ocean	1	1.2	1	1	new / 0
Surveys · South Pacific Ocean	1	1.2	0	—	1.7× / 0.6
Structures · North Atlantic Ocean	1	0.8	0	—	5.0× / 0.2
Wrecks · Southern Ocean	1	0.8	1	0	new / 0
Quakes · Mediterranean Sea - Eastern Basin	1	0.7	1	0	1.7× / 0.6
Other · Inner Seas off the West Coast of Scotland	1	0.6	0	—	1.7× / 0.6
Exercises · Andaman or Burma Sea	1	0.5	1	0	1.7× / 0.6
Quakes · South Atlantic Ocean	1	0.5	1	0	0.6× / 1.8
Cable ops · Celtic Sea	1	0.3	1	0	5.0× / 0.2
Incidents · Bismarck Sea	1	0.1	0	—	5.0× / 0.2
Incidents · Timor Sea	1	0.1	0	—	new / 0
Surveys · Arctic Oceanlong running	0	616	22	2,608	— / 0
Surveys · Beaufort Sealong running	0	308	11	2,608	— / 0
Wrecks · South China Sea	0	112	4	160	— / 0
Wrecks · The Northwestern Passages	0	112	4	241	— / 0
Surveys · Laptev Sealong running	0	84	3	1,742	— / 0
Nav aids · Arabian Sealong running	0	56	2	439	0.0× / 1
Surveys · Baffin Bay	0	56	2	241	— / 0
Surveys · Chukchi Sealong running	0	56	2	2,141	— / 0
Surveys · Davis Strait	0	56	2	55	— / 0
Nav aids · Mediterranean Sea - Western Basin	0	56	2	217	0.0× / 0.6
Wrecks · North Sea	0	53.4	1	283	— / 0
Cable ops · Caribbean Sea	0	42.5	1	199	0.0× / 1.2
Ordnance · English Channel	0	29.8	0	—	— / 0
Missiles · Aegean Sea	0	28	1	60	— / 0
Surveys · Arabian Sea	0	28	1	38	— / 0
Wrecks · Arabian Sealong running	0	28	1	439	— / 0
Other · Arctic Ocean	0	28	1	239	— / 0
Surveys · Bering Sea	0	28	1	198	— / 0
Wrecks · English Channel	0	28	1	68	0.0× / 0.6
Surveys · Greenland Sealong running	0	28	1	2,924	— / 0
Nav aids · Gulf of Suez	0	28	1	300	— / 0
Other · Gulf of Suez	0	28	1	195	— / 0
Surveys · Indian Ocean	0	28	1	28	0.0× / 0.8
Nav aids · Mediterranean Sea - Eastern Basin	0	28	1	132	— / 0
Ordnance · Mediterranean Sea - Eastern Basin	0	28	1	60	0.0× / 0.2
Restricted · North Atlantic Ocean	0	28	1	39	0.0× / 0.8
Nav aids · Persian Gulf	0	28	1	93	0.0× / 0.2
Restricted · Persian Gulf	0	28	1	88	— / 0
Wrecks · Persian Gulf	0	28	1	66	0.0× / 0.8
Volcanic · Philippine Sealong running	0	28	1	367	0.0× / 1.2
Cable ops · Red Sea	0	28	1	58	0.0× / 0.2
Nav aids · Red Sea	0	28	1	42	0.0× / 0.2
Wrecks · South Atlantic Ocean	0	28	1	292	0.0× / 0.4
Other · South China Sealong running	0	28	1	957	— / 0
Wrecks · South Pacific Ocean	0	28	1	72	0.0× / 0.2
Surveys · Tasman Sea	0	28	1	45	0.0× / 0.2
Other · The Northwestern Passages	0	28	1	212	— / 0
Surveys · The Northwestern Passageslong running	0	28	1	906	— / 0
Incidents · Adriatic Sea	0	25.4	0	—	0.0× / 0.4
Piracy · Persian Gulf	0	25.4	0	—	— / 0
Incidents · Mediterranean Sea - Eastern Basin	0	18.4	0	—	0.0× / 1.4
Incidents · Mediterranean Sea - Western Basin	0	18.4	0	—	0.0× / 0.2
Wrecks · North Atlantic Ocean	0	18.4	0	—	0.0× / 0.2
Wrecks · Gulf of Guinea	0	11.4	0	—	— / 0
Piracy · Gulf of Oman	0	11.4	0	—	— / 0
Wrecks · Indian Ocean	0	11.4	0	—	— / 0
Incidents · Japan Sea	0	11.4	0	—	0.0× / 0.6
Wrecks · Mediterranean Sea - Eastern Basin	0	11.4	0	—	— / 0
Incidents · Red Sea	0	10.5	0	—	0.0× / 0.2
Cable ops · Ceram Sea	0	9	0	—	— / 0
Spills · North Atlantic Ocean	0	7	0	—	0.0× / 3
Cable ops · Gulf of Guinea	0	5.1	0	—	0.0× / 0.6
Ordnance · North Pacific Ocean	0	5	0	—	0.0× / 0.2
Surveys · North Pacific Ocean	0	4	0	—	— / 0
Missiles · Baffin Bay	0	3.7	0	—	— / 0
Debris · Timor Sea	0	2.2	0	—	— / 0
Quakes · Philippine Sea	0	0.5	0	—	0.0× / 4.2
Quakes · Southern Ocean	0	0.5	0	—	0.0× / 0.8
Quakes · Norwegian Sea	0	0.3	0	—	— / 0

Cite: seahazards.com Sea Ledger, 2011-02, retrieved 2026-09-03

Not for navigation. Warning-days = days each warning was in force within the month, summed. Only warnings we display are counted; the ratio compares warnings issued with the mean of the reference months.