Sea Ledger, November 2011

2011-11-01 to 2011-11-30 · archive

issued: 410
warning-days in force: 6,369
in force at month end: 208
sea × type cells: 199

baseline: same month, previous 5 years (2010-11, 2009-11, 2008-11, 2007-11, 2006-11)

By type

type	issued	warning-days	in force at end
Incidents	103	795.2	27
Exercises	70	783.4	28
Nav aids	59	1,316.8	41
Cable ops	53	936.6	28
Quakes	33	98.6	6
Derelicts	32	91.4	1
Missiles	21	190.2	5
Piracy	15	137.5	4
Other	11	288.8	10
Surveys	4	899.8	29
Wrecks	2	483.1	17
Ordnance	2	69.7	3
Spills	2	33.5	1
Volcanic	1	22.1	1
Containers	1	20.5	0
Icebergs	1	0.3	1
Restricted	0	109.4	3
War risk	0	60	2
Structures	0	30	1
Debris	0	2.4	0

By sea and type · 199 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · North Pacific Oceansurge	33	153.1	4	57	2.8× / 11.6
Incidents · South China Seasurge	19	87.1	5	32	3.8× / 5
Incidents · North Atlantic Oceansurge	16	294	11	42	2.2× / 7.4
Cable ops · North Atlantic Oceansurge	15	139.6	4	30	5.4× / 2.8
Exercises · South Atlantic Ocean	15	70.8	5	79	1.8× / 8.4
Nav aids · North Seasurge	14	99.8	5	40	2.1× / 6.6
Exercises · North Pacific Ocean	13	80	2	34	1.8× / 7.2
Cable ops · South Atlantic Oceanlong running	12	145.9	3	1,117	0.6× / 21.6
Quakes · South Pacific Ocean	9	28.4	1	31	0.6× / 14.2
Missiles · North Pacific Ocean	8	62.9	1	60	1.3× / 6.2
Nav aids · Inner Seas off the West Coast of Scotlandsurge	8	37.8	1	29	3.6× / 2.2
Quakes · North Pacific Ocean	8	24	0	—	0.8× / 10.4
Nav aids · South Atlantic Oceanlong running	7	282.5	9	1,197	1.3× / 5.4
Exercises · Arabian Seasurge	7	90.3	4	39	2.1× / 3.4
Exercises · Bay of Bengal	7	77.3	4	34	0.7× / 9.4
Incidents · Indian Ocean	7	27.9	2	27	1.0× / 7
Piracy · Indian Ocean	6	56.6	2	31	0.7× / 8.4
Exercises · North Atlantic Ocean	6	28.7	0	—	0.9× / 6.4
Derelicts · North Atlantic Ocean	6	16.8	0	—	1.4× / 4.2
Missiles · South Atlantic Oceansurge	5	42	2	41	25× / 0.2
Piracy · Arabian Sea	5	40	1	29	0.7× / 7
Exercises · Yellow Sea	5	39.6	2	35	0.9× / 5.6
Cable ops · Mediterranean Sea - Eastern Basin	5	22	1	27	1.5× / 3.4
Cable ops · Gulf of Guineasurge	4	59.8	1	36	6.7× / 0.6
Exercises · Philippine Sea	4	52.9	1	32	0.9× / 4.2
Incidents · South Pacific Ocean	4	50.3	1	47	0.5× / 7.4
Cable ops · North Seasurge	4	26.2	0	—	3.3× / 1.2
Missiles · Barentsz Seasurge	4	21.3	1	12	4.0× / 1
Derelicts · Indian Oceansurge	4	19.6	0	—	2.0× / 2
Derelicts · South China Sea	4	10.9	0	—	1.4× / 2.8
Nav aids · North Pacific Ocean	3	100.3	4	199	1.4× / 2.2
Nav aids · North Atlantic Oceanlong running	3	75.7	1	547	0.5× / 5.8
Incidents · South Atlantic Ocean	3	53.5	2	45	0.5× / 5.8
Nav aids · Bay of Bengalsurge	3	37.8	2	77	7.5× / 0.4
Nav aids · Irish Sea and St. George's Channel	3	34.6	1	88	0.8× / 3.6
Nav aids · English Channel	3	30.9	1	60	1.1× / 2.6
Other · North Atlantic Oceansurge	3	16.1	1	15	5.0× / 0.6
Exercises · South Pacific Ocean	3	12	1	25	0.7× / 4.4
Derelicts · Timor Seasurge	3	5	0	—	15× / 0.2
Exercises · South China Sea	2	97.4	2	34	0.8× / 2.6
Cable ops · South China Sea	2	91.5	4	232	1.0× / 2
Cable ops · Persian Gulf	2	90	3	245	10× / 0.2
Nav aids · Gulf of Mexico	2	80.3	2	242	1.3× / 1.6
Cable ops · Black Sea	2	55.3	1	44	1.7× / 1.2
Nav aids · Laccadive Sea	2	34.5	2	40	10× / 0.2
Incidents · Caribbean Sea	2	23.3	0	—	10× / 0.2
Piracy · Gulf of Aden	2	20	1	30	5.0× / 0.4
Incidents · Mediterranean Sea - Eastern Basin	2	16.8	0	—	2.0× / 1
Cable ops · Bay of Bengal	2	12.7	1	12	0.8× / 2.6
Incidents · Mediterranean Sea - Western Basin	2	11.2	0	—	5.0× / 0.4
Exercises · Bering Sea	2	10.9	0	—	5.0× / 0.4
Other · South Atlantic Ocean	2	9	0	—	1.1× / 1.8
Missiles · North Atlantic Ocean	2	6.8	0	—	3.3× / 0.6
Derelicts · Bass Strait	2	6	0	—	5.0× / 0.4
Quakes · Coral Sea	2	6	0	—	0.9× / 2.2
Derelicts · Gulf of Guineanew	2	4.3	0	—	new / 0
Derelicts · Arabian Sea	2	3	1	29	5.0× / 0.4
Nav aids · Coral Sea	2	2.3	0	—	0.5× / 4
Incidents · Coral Sea	2	0.5	0	—	0.7× / 2.8
Incidents · Bass Strait	2	0.2	0	—	10× / 0.2
Surveys · South Atlantic Ocean	1	90	3	39	0.4× / 2.8
Nav aids · Celtic Sea	1	77	2	112	0.4× / 2.8
Ordnance · North Sealong running	1	67.7	3	1,125	5.0× / 0.2
Other · North Pacific Ocean	1	60.2	2	177	1.7× / 0.6
Wrecks · South Pacific Ocean	1	42.5	2	271	new / 0
Nav aids · Mediterranean Sea - Western Basin	1	35.3	2	103	1.3× / 0.8
Exercises · Laccadive Sea	1	29.9	1	34	0.2× / 5.8
Other · Bay of Bengal	1	29	1	219	new / 0
Surveys · Greenland Sea	1	28.5	1	28	new / 0
Volcanic · North Atlantic Ocean	1	22.1	1	22	new / 0
Spills · South Atlantic Ocean	1	19.5	1	19	new / 0
Incidents · Davis Strait	1	18.4	0	—	5.0× / 0.2
Nav aids · Caribbean Sea	1	17.2	0	—	1.7× / 0.6
Surveys · Mediterranean Sea - Eastern Basin	1	16.3	1	41	1.3× / 0.8
Cable ops · Eastern China Sea	1	15.6	0	—	5.0× / 0.2
Exercises · Gulf of California	1	15.3	0	—	new / 0
Exercises · Gulf of Mexico	1	15.3	0	—	1.3× / 0.8
Spills · North Atlantic Ocean	1	14	0	—	0.4× / 2.8
Incidents · Adriatic Sea	1	13.7	0	—	new / 0
Missiles · Southern Ocean	1	12.5	0	—	new / 0
Cable ops · Caribbean Sea	1	11.1	1	11	2.5× / 0.4
Incidents · Ionian Sea	1	10.3	0	—	new / 0
Surveys · Laccadive Sea	1	10.2	1	10	new / 0
Piracy · Mozambique Channel	1	10	0	—	5.0× / 0.2
Other · Caribbean Sea	1	9.5	1	9	5.0× / 0.2
Nav aids · Gulf of California	1	6.9	0	—	0.5× / 2
Cable ops · Adriatic Sea	1	5.9	0	—	new / 0
Cable ops · Celtic Sea	1	5.8	0	—	5.0× / 0.2
Quakes · Bering Sea	1	5.3	0	—	new / 0
Derelicts · Coral Sea	1	5.3	0	—	5.0× / 0.2
Missiles · Laccadive Sea	1	5.1	0	—	new / 0
Exercises · Andaman or Burma Sea	1	5	0	—	1.7× / 0.6
Exercises · Indian Ocean	1	4.9	0	—	1.3× / 0.8
Quakes · Eastern China Sea	1	4.1	0	—	5.0× / 0.2
Cable ops · Strait of Gibraltar	1	3.3	1	3	new / 0
Incidents · Gulf of Mexico	1	3.2	1	3	5.0× / 0.2
Exercises · North Sea	1	3.1	1	3	new / 0
Derelicts · Arafura Sea	1	3	0	—	new / 0
Quakes · Banda Sea	1	3	0	—	0.8× / 1.2
Derelicts · Bay of Bengal	1	3	0	—	5.0× / 0.2
Derelicts · Bering Sea	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	0.8× / 1.2
Containers · Gulf of Mexico	1	3	0	—	new / 0
Quakes · Gulf of Tomini	1	3	0	—	new / 0
Derelicts · Laccadive Sea	1	3	0	—	new / 0
Quakes · Mediterranean Sea - Eastern Basin	1	3	0	—	new / 0
Quakes · Molukka Sea	1	3	0	—	2.5× / 0.4
Quakes · North Atlantic Ocean	1	3	0	—	1.7× / 0.6
Derelicts · North Pacific Ocean	1	3	0	—	1.0× / 1
Derelicts · Philippine Sea	1	3	0	—	5.0× / 0.2
Other · South China Sea	1	3	0	—	2.5× / 0.4
Quakes · Southern Ocean	1	3	0	—	5.0× / 0.2
Incidents · Gulf of Thailand	1	2.6	0	—	5.0× / 0.2
Quakes · Java Sea	1	2.6	1	2	new / 0
Nav aids · Indian Ocean	1	2.5	0	—	1.3× / 0.8
Quakes · Solomon Sea	1	2.5	1	2	0.3× / 3
Wrecks · Irish Sea and St. George's Channel	1	2.1	1	2	new / 0
Nav aids · Gulf of Alaska	1	2	0	—	0.7× / 1.4
Ordnance · Philippine Sea	1	2	0	—	new / 0
Quakes · South Atlantic Ocean	1	2	1	1	0.7× / 1.4
Piracy · Gulf of Guinea	1	1.9	0	—	new / 0
Nav aids · Great Australian Bight	1	1.3	0	—	0.7× / 1.4
Incidents · Ligurian Sea	1	1.3	1	1	new / 0
Derelicts · South Pacific Ocean	1	1.3	0	—	1.0× / 1
Derelicts · Irish Sea and St. George's Channel	1	1.2	0	—	new / 0
Nav aids · Tasman Sea	1	1.2	0	—	2.5× / 0.4
Incidents · Aegean Sea	1	1	0	—	new / 0
Quakes · South China Sea	1	1	1	0	1.7× / 0.6
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	1	0	—	0.6× / 1.8
Incidents · Gulf of California	1	0.7	0	—	new / 0
Incidents · Philippine Sea	1	0.6	0	—	0.2× / 4.8
Incidents · Timor Sea	1	0.6	0	—	5.0× / 0.2
Other · Irish Sea and St. George's Channel	1	0.5	0	—	5.0× / 0.2
Incidents · Arafura Sea	1	0.3	0	—	2.5× / 0.4
Icebergs · Labrador Sea	1	0.3	1	0	new / 0
Quakes · Andaman or Burma Sea	1	0.2	1	0	new / 0
Other · Philippine Sea	1	0.1	0	—	5.0× / 0.2
Surveys · Arctic Oceanlong running	0	270	9	516	— / 0
Exercises · Aegean Sea	0	150	5	335	0.0× / 0.6
Surveys · Beaufort Sealong running	0	120	4	476	— / 0
Cable ops · Gulf of Mexico	0	120	4	81	0.0× / 1.4
Wrecks · The Northwestern Passageslong running	0	120	4	451	0.0× / 0.2
Wrecks · Arabian Sea	0	90	3	183	0.0× / 0.4
Nav aids · Arabian Sealong running	0	60	2	481	— / 0
Surveys · Baffin Baylong running	0	60	2	516	— / 0
Other · Mediterranean Sea - Eastern Basin	0	60	2	69	0.0× / 1.2
War risk · Mediterranean Sea - Eastern Basin	0	60	2	189	— / 0
Wrecks · North Atlantic Ocean	0	60	2	103	— / 0
Nav aids · South China Sea	0	60	2	107	— / 0
Surveys · The Northwestern Passages	0	60	2	109	— / 0
Nav aids · Hudson Bay	0	58.6	0	—	— / 0
Nav aids · South Pacific Ocean	0	57.3	1	111	0.0× / 1.2
Missiles · Aegean Sea	0	30	1	335	— / 0
Cable ops · Arabian Sea	0	30	1	37	0.0× / 2.2
Surveys · Barentsz Sea	0	30	1	91	— / 0
Surveys · Bering Sealong running	0	30	1	473	— / 0
Surveys · Davis Strait	0	30	1	194	— / 0
Surveys · Indian Ocean	0	30	1	37	0.0× / 0.4
Nav aids · Kara Sea	0	30	1	84	— / 0
Other · Kara Sea	0	30	1	91	— / 0
Cable ops · Labrador Sea	0	30	1	68	— / 0
Wrecks · Laccadive Sea	0	30	1	243	0.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	30	1	407	0.0× / 0.8
Surveys · Mozambique Channel	0	30	1	160	— / 0
Restricted · North Sea	0	30	1	100	0.0× / 0.2
Structures · North Sea	0	30	1	107	— / 0
Wrecks · North Sea	0	30	1	58	0.0× / 0.8
Other · Persian Gulf	0	30	1	80	0.0× / 0.2
Restricted · Persian Gulf	0	30	1	363	— / 0
Surveys · Persian Gulf	0	30	1	203	— / 0
Wrecks · Persian Gulf	0	30	1	341	0.0× / 0.2
Nav aids · Red Sea	0	30	1	317	0.0× / 0.6
Nav aids · Sea of Okhotsk	0	30	1	92	0.0× / 0.4
Restricted · Sea of Okhotsk	0	30	1	48	— / 0
Wrecks · South Atlantic Oceanlong running	0	30	1	567	0.0× / 0.8
Wrecks · South China Sealong running	0	30	1	380	0.0× / 0.2
Cable ops · South Pacific Ocean	0	30	1	190	0.0× / 0.4
Cable ops · Tasman Sea	0	30	1	62	0.0× / 0.2
Other · The Northwestern Passageslong running	0	30	1	487	— / 0
Surveys · Arabian Sea	0	29.8	0	—	0.0× / 1
Surveys · Sea of Okhotsk	0	20	0	—	— / 0
Restricted · North Atlantic Ocean	0	19.4	0	—	0.0× / 0.6
Wrecks · Barentsz Sea	0	18.5	0	—	— / 0
Containers · South Pacific Ocean	0	17.5	0	—	0.0× / 0.2
Surveys · Black Sea	0	15	0	—	— / 0
Other · Gulf of Thailand	0	11.4	0	—	— / 0
Incidents · Tasman Sea	0	11.4	0	—	0.0× / 2.4
Missiles · Kara Sea	0	9.6	0	—	— / 0
Cable ops · Gulf of Thailand	0	7	0	—	— / 0
Piracy · Singapore Strait	0	4.5	0	—	0.0× / 0.2
Piracy · Sulu Sea	0	4.5	0	—	— / 0
Incidents · Arabian Sea	0	4.4	0	—	0.0× / 1
Incidents · Mozambique Channel	0	4.4	0	—	0.0× / 0.6
Incidents · Persian Gulf	0	4.4	0	—	0.0× / 0.4
Cable ops · Makassar Strait	0	3.4	0	—	— / 0
Debris · Indian Ocean	0	2.4	0	—	0.0× / 0.8
Quakes · Indian Ocean	0	1.5	0	—	0.0× / 3.4
Cable ops · Sea of Marmara	0	1.5	0	—	0.0× / 0.4
Cable ops · Sea of Okhotsk	0	0	0	—	— / 0

Cite: seahazards.com Sea Ledger, 2011-11, 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.