Sea Ledger, March 2011

2011-03-01 to 2011-03-31 · archive

issued: 662
warning-days in force: 7,926
in force at month end: 251
sea × type cells: 199

baseline: same month, previous 5 years (2010-03, 2009-03, 2008-03, 2007-03, 2006-03)

By type

type	issued	warning-days	in force at end
Quakes	226	698.1	7
Piracy	79	395.1	16
Exercises	77	769.4	26
Incidents	76	886.6	36
Nav aids	51	1,376.8	45
Cable ops	43	758.1	25
Surveys	22	1,720.9	54
Missiles	22	195.6	5
Derelicts	18	59.3	2
Other	15	311.9	10
Ordnance	8	77.7	4
Debris	6	18	0
Containers	5	12	1
Spills	4	53	1
Wrecks	3	462.8	14
Icebergs	3	6.8	1
Restricted	2	41	1
Towing	1	1.4	0
Structures	1	50.6	2
Volcanic	0	31	1

By sea and type · 199 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Quakes · North Pacific Oceansurge	201	615.2	6	22	44× / 4.6
Piracy · Arabian Seasurge	60	273.9	9	38	50× / 1.2
Cable ops · South Atlantic Oceanlong running	21	168.5	5	873	0.8× / 24.8
Incidents · North Pacific Ocean	12	108.6	5	40	1.5× / 8.2
Exercises · North Pacific Ocean	12	49.6	2	35	1.2× / 10.2
Incidents · South China Seasurge	11	139.5	5	36	5.5× / 2
Piracy · Indian Ocean	11	63.2	2	30	2.0× / 5.6
Incidents · North Atlantic Oceansurge	10	214.1	7	66	3.3× / 3
Exercises · Japan Seasurge	10	83.4	4	36	2.3× / 4.4
Nav aids · North Sea	9	158.1	6	79	1.4× / 6.6
Exercises · South Atlantic Ocean	9	49.2	2	31	1.7× / 5.2
Incidents · Mediterranean Sea - Eastern Basinsurge	8	60.6	7	20	13× / 0.6
Exercises · Yellow Sea	8	44.6	4	36	1.6× / 5
Surveys · South Atlantic Oceansurge	7	70.1	2	33	3.9× / 1.8
Missiles · North Atlantic Oceansurge	7	32.2	2	32	5.8× / 1.2
Quakes · South Pacific Ocean	7	24	1	31	0.5× / 13.8
Other · South Atlantic Oceansurge	6	27.4	0	—	15× / 0.4
Incidents · Coral Sea	6	8.1	0	—	1.6× / 3.8
Nav aids · Coral Seasurge	6	7.8	0	—	2.3× / 2.6
Exercises · Arabian Sea	5	82.4	3	35	1.1× / 4.6
Missiles · North Pacific Ocean	5	81.8	2	56	0.9× / 5.4
Nav aids · Indian Oceansurge	5	78.3	2	95	4.2× / 1.2
Exercises · Bay of Bengal	5	51.2	0	—	0.7× / 7.6
Incidents · South Atlantic Ocean	5	44	2	53	1.0× / 5
Incidents · Indian Ocean	5	39.3	1	63	1.4× / 3.6
Exercises · Mediterranean Sea - Eastern Basinsurge	5	22.7	0	—	2.5× / 2
Derelicts · Mediterranean Sea - Eastern Basinsurge	5	12.6	1	20	25× / 0.2
Nav aids · South Atlantic Oceanlong running	4	307.6	10	953	1.4× / 2.8
Piracy · South China Seasurge	4	41.1	3	36	10× / 0.4
Ordnance · Mediterranean Sea - Eastern Basinsurge	4	35.8	2	60	20× / 0.2
Missiles · Barentsz Seanew	4	21.2	0	—	new / 0
Nav aids · Gulf of Alaskasurge	4	13.6	1	27	2.2× / 1.8
Exercises · Baltic Sea	4	11.6	1	17	1.8× / 2.2
Nav aids · Bass Straitsurge	4	2.4	0	—	5.0× / 0.8
Nav aids · North Pacific Oceansurge	3	98.7	3	94	2.1× / 1.4
Cable ops · Bay of Bengal	3	93.5	3	44	0.9× / 3.4
Cable ops · Persian Gulfsurge	3	39.1	2	78	3.8× / 0.8
Exercises · Laccadive Sea	3	35.4	1	35	0.5× / 6.6
Nav aids · Celtic Sea	3	26.7	2	25	1.5× / 2
Other · North Seasurge	3	25.5	1	24	3.0× / 1
Surveys · Mediterranean Sea - Eastern Basin	3	24.8	1	24	1.5× / 2
Cable ops · South China Sea	3	20.5	3	8	1.5× / 2
Missiles · Bay of Bengalsurge	3	15.7	0	—	3.8× / 0.8
Exercises · South Pacific Ocean	3	12.1	0	—	1.1× / 2.6
Quakes · Japan Seasurge	3	9	0	—	5.0× / 0.6
Quakes · Philippine Sea	3	9	0	—	0.8× / 3.6
Quakes · Solomon Seasurge	3	9	0	—	5.0× / 0.6
Surveys · Bass Straitsurge	3	8.8	0	—	15× / 0.2
Exercises · North Atlantic Ocean	3	8.7	1	61	0.4× / 7.6
Exercises · South China Sea	2	104.9	2	40	3.3× / 0.6
Cable ops · Gulf of Mexico	2	59.4	2	138	2.5× / 0.8
Nav aids · Irish Sea and St. George's Channel	2	47	1	33	0.8× / 2.6
Nav aids · Caribbean Sea	2	43.4	1	30	10× / 0.2
Cable ops · South Pacific Ocean	2	42.4	1	36	2.0× / 1
Incidents · South Pacific Ocean	2	41.8	1	38	0.4× / 5.4
Surveys · Irish Sea and St. George's Channel	2	37.9	1	41	5.0× / 0.4
Other · North Pacific Ocean	2	28.4	2	14	2.5× / 0.8
Incidents · Philippine Sea	2	25.6	0	—	0.5× / 4.4
Surveys · Gulf of Aqabanew	2	25	1	30	new / 0
Nav aids · Gulf of Mexico	2	24.3	1	26	1.1× / 1.8
Piracy · Gulf of Aden	2	16.5	2	40	2.5× / 0.8
Spills · North Pacific Ocean	2	16	1	23	3.3× / 0.6
Incidents · Mozambique Channel	2	14	1	40	10× / 0.2
Surveys · North Sea	2	13.1	1	9	3.3× / 0.6
Exercises · Andaman or Burma Sea	2	9.2	0	—	1.7× / 1.2
Derelicts · South Atlantic Ocean	2	9	0	—	0.7× / 2.8
Quakes · South Atlantic Ocean	2	8.5	0	—	1.7× / 1.2
Derelicts · North Atlantic Ocean	2	7.5	0	—	2.0× / 1
Quakes · Coral Sea	2	6.1	0	—	1.0× / 2
Debris · Coral Seanew	2	6	0	—	new / 0
Other · Irish Sea and St. George's Channelnew	2	6	0	—	new / 0
Icebergs · South Atlantic Ocean	2	6	0	—	0.8× / 2.6
Missiles · Indian Oceannew	2	5.4	0	—	new / 0
Containers · North Pacific Oceannew	2	4.1	1	30	new / 0
Containers · South China Seanew	2	3.1	0	—	new / 0
Incidents · Bass Straitnew	2	1.4	0	—	new / 0
Incidents · Timor Seanew	2	0.6	0	—	new / 0
Piracy · Gulf of Omannew	2	0.4	0	—	new / 0
Cable ops · Arabian Sea	1	78.5	2	55	0.5× / 2
Cable ops · Mediterranean Sea - Eastern Basin	1	72.8	0	—	0.4× / 2.6
Nav aids · North Atlantic Ocean	1	62.1	2	351	0.6× / 1.8
Wrecks · South Pacific Ocean	1	58.9	2	103	new / 0
Nav aids · English Channel	1	50.5	2	51	0.4× / 2.6
Incidents · Arabian Sea	1	41.7	1	38	1.7× / 0.6
Other · South China Sealong running	1	35.8	2	988	new / 0
Exercises · Philippine Sea	1	35	1	35	0.5× / 2
Surveys · Arabian Sea	1	33.7	0	—	1.7× / 0.6
Nav aids · Inner Seas off the West Coast of Scotland	1	31.9	1	113	0.2× / 4.6
Nav aids · Tasman Sea	1	31.8	1	36	2.5× / 0.4
Incidents · Caribbean Sea	1	28.3	1	58	1.7× / 0.6
Cable ops · Red Sea	1	24.5	1	89	1.7× / 0.6
Spills · Gulf of Mexico	1	23	0	—	0.2× / 5
Structures · Indian Ocean	1	19.6	1	19	new / 0
Cable ops · Laccadive Sea	1	14.9	1	14	2.5× / 0.4
Spills · Gulf of Alaska	1	14	0	—	5.0× / 0.2
Incidents · Mediterranean Sea - Western Basin	1	13.7	0	—	5.0× / 0.2
Cable ops · Philippine Sea	1	12.6	1	12	1.7× / 0.6
Surveys · Gulf of Mexico	1	11.6	1	11	1.7× / 0.6
Incidents · Bay of Bengal	1	10.7	1	42	2.5× / 0.4
Surveys · North Pacific Ocean	1	10	0	—	2.5× / 0.4
Wrecks · Singapore Strait	1	9	0	—	new / 0
Incidents · Andaman or Burma Sea	1	8.7	1	8	new / 0
Derelicts · Ionian Sea	1	8.2	1	8	new / 0
Cable ops · Mozambique Channel	1	8	0	—	5.0× / 0.2
Cable ops · Gulf of Guinea	1	7.6	0	—	2.5× / 0.4
Exercises · Red Sea	1	7.3	0	—	new / 0
Restricted · South Atlantic Ocean	1	7	0	—	new / 0
Cable ops · Adriatic Sea	1	6.4	1	6	new / 0
Ordnance · Red Sea	1	6.4	0	—	5.0× / 0.2
Cable ops · Celtic Sea	1	5.5	0	—	1.3× / 0.8
Missiles · Arctic Ocean	1	4.7	0	—	new / 0
Derelicts · Arabian Sea	1	3.4	0	—	5.0× / 0.2
Debris · Arafura Sea	1	3	0	—	new / 0
Derelicts · Arafura Sea	1	3	0	—	0.8× / 1.2
Containers · Bass Strait	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.7× / 0.6
Derelicts · Caribbean Sea	1	3	0	—	1.3× / 0.8
Quakes · Caribbean Sea	1	3	0	—	2.5× / 0.4
Derelicts · Coral Sea	1	3	0	—	2.5× / 0.4
Quakes · Gulf of California	1	3	0	—	5.0× / 0.2
Debris · Indian Ocean	1	3	0	—	5.0× / 0.2
Derelicts · Indian Ocean	1	3	0	—	0.4× / 2.4
Derelicts · Irish Sea and St. George's Channel	1	3	0	—	new / 0
Quakes · Java Sea	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	new / 0
Debris · North Atlantic Ocean	1	3	0	—	1.3× / 0.8
Restricted · North Atlantic Ocean	1	3	0	—	0.8× / 1.2
Quakes · South China Sea	1	3	0	—	1.0× / 1
Debris · South Pacific Ocean	1	3	0	—	5.0× / 0.2
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	2.8	0	—	0.3× / 3
Ordnance · Ionian Sea	1	2.4	1	2	new / 0
Exercises · Caribbean Sea	1	2.1	0	—	2.5× / 0.4
Other · Inner Seas off the West Coast of Scotland	1	2	0	—	1.3× / 0.8
Exercises · Persian Gulf	1	2	0	—	5.0× / 0.2
Exercises · Coral Sea	1	1.7	0	—	1.7× / 0.6
Towing · South Atlantic Ocean	1	1.4	0	—	new / 0
Exercises · Barentsz Sea	1	1.3	0	—	5.0× / 0.2
Ordnance · Arabian Sea	1	1.2	0	—	5.0× / 0.2
Ordnance · Japan Sea	1	0.9	0	—	2.5× / 0.4
Icebergs · South Pacific Ocean	1	0.8	1	0	new / 0
Incidents · Tasman Sea	1	0.7	1	0	0.6× / 1.6
Derelicts · Celtic Sea	1	0.6	0	—	1.7× / 0.6
Incidents · Bismarck Sea	1	0.3	0	—	5.0× / 0.2
Nav aids · Arafura Sea	1	0.1	0	—	2.5× / 0.4
Nav aids · Great Australian Bight	1	0.1	0	—	1.0× / 1
Wrecks · Great Australian Bight	1	0.1	0	—	new / 0
Incidents · Solomon Sea	1	0.1	0	—	new / 0
Incidents · Davis Strait	1	0	0	—	new / 0
Surveys · Arctic Oceanlong running	0	682	22	2,639	— / 0
Surveys · Beaufort Sealong running	0	341	11	2,639	— / 0
Nav aids · South Pacific Oceanlong running	0	186	6	441	0.0× / 2.8
Exercises · Aegean Sea	0	155	5	91	0.0× / 2.8
Wrecks · South China Sea	0	124	4	191	— / 0
Wrecks · The Northwestern Passages	0	124	4	272	— / 0
Surveys · Laptev Sealong running	0	93	3	1,773	— / 0
Other · Persian Gulf	0	80.4	2	226	— / 0
Nav aids · Arabian Sealong running	0	62	2	470	0.0× / 1
Surveys · Baffin Bay	0	62	2	272	— / 0
Surveys · Chukchi Sealong running	0	62	2	2,172	— / 0
Surveys · Davis Strait	0	62	2	86	— / 0
Incidents · Gulf of Mexico	0	42.4	1	64	0.0× / 0.2
Nav aids · Mediterranean Sea - Western Basin	0	33.6	1	248	0.0× / 1
Missiles · Aegean Sea	0	31	1	91	— / 0
Wrecks · Arabian Sealong running	0	31	1	470	— / 0
Other · Arctic Ocean	0	31	1	270	— / 0
Surveys · Bering Sea	0	31	1	229	— / 0
Cable ops · Caribbean Sea	0	31	1	230	0.0× / 0.2
Surveys · Greenland Sealong running	0	31	1	2,955	— / 0
Nav aids · Gulf of Suez	0	31	1	331	0.0× / 1
Other · Gulf of Suez	0	31	1	226	0.0× / 0.2
Surveys · Indian Ocean	0	31	1	59	0.0× / 0.4
Nav aids · Mediterranean Sea - Eastern Basin	0	31	1	163	0.0× / 0.2
Surveys · Mozambique Channel	0	31	1	48	— / 0
Cable ops · North Pacific Ocean	0	31	1	49	0.0× / 0.6
Ordnance · North Sealong running	0	31	1	881	0.0× / 0.8
Structures · North Sea	0	31	1	51	— / 0
Wrecks · North Sea	0	31	1	314	— / 0
Restricted · Persian Gulf	0	31	1	119	0.0× / 0.2
Wrecks · Persian Gulf	0	31	1	97	0.0× / 0.2
Volcanic · Philippine Sealong running	0	31	1	398	— / 0
Nav aids · Red Sea	0	31	1	73	— / 0
Wrecks · South Atlantic Ocean	0	31	1	323	0.0× / 0.2
Incidents · Southern Ocean	0	31	1	37	0.0× / 0.2
Cable ops · Tasman Sea	0	31	1	34	0.0× / 0.8
Other · The Northwestern Passages	0	31	1	243	— / 0
Surveys · The Northwestern Passageslong running	0	31	1	937	— / 0
Surveys · Tasman Sea	0	28.9	0	—	— / 0
Wrecks · English Channel	0	18.4	0	—	— / 0
Other · Mediterranean Sea - Eastern Basin	0	13.4	0	—	0.0× / 1.4
Nav aids · Persian Gulf	0	11.4	0	—	— / 0
Incidents · Persian Gulf	0	11.4	0	—	0.0× / 0.4
Cable ops · Makassar Strait	0	10	0	—	— / 0
Wrecks · Southern Ocean	0	4.4	0	—	— / 0
Nav aids · Laccadive Sea	0	3.6	0	—	0.0× / 1.2
Missiles · South Pacific Ocean	0	3.6	0	—	0.0× / 0.2
Quakes · Mediterranean Sea - Eastern Basin	0	2.3	0	—	0.0× / 0.2
Containers · South Atlantic Ocean	0	1.8	0	—	0.0× / 0.4
Cable ops · North Atlantic Ocean	0	0.9	0	—	0.0× / 5.2
Containers · Caribbean Sea	0	0	0	—	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2011-03, 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.