Sea Ledger, January 2011

2011-01-01 to 2011-01-31 · archive

issued: 441
warning-days in force: 7,705
in force at month end: 247
sea × type cells: 186

baseline: same month, previous 5 years (2010-01, 2009-01, 2008-01, 2007-01, 2006-01)

By type

type	issued	warning-days	in force at end
Incidents	85	1,147.8	36
Piracy	72	571.2	9
Exercises	61	653.7	19
Nav aids	57	1,376.2	44
Cable ops	54	850.4	28
Quakes	37	113.8	4
Missiles	17	128.7	12
Other	12	276.6	10
Derelicts	11	43.4	0
Ordnance	11	205.8	7
Surveys	9	1,539.6	52
Debris	6	15.8	1
Spills	5	48.1	3
Wrecks	2	659.6	19
Restricted	2	43.1	2
Icebergs	0	0.1	0
Volcanic	0	31	1

By sea and type · 186 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Piracy · Arabian Seasurge	40	255.1	5	34	40× / 1
Cable ops · South Atlantic Oceanlong running	23	187.8	7	814	1.1× / 20.6
Piracy · Indian Oceansurge	22	191.7	1	36	12× / 1.8
Incidents · North Pacific Oceansurge	21	141.4	2	32	2.2× / 9.4
Nav aids · North Sea	15	258.5	12	319	1.5× / 10
Exercises · North Pacific Oceansurge	13	45	4	35	2.1× / 6.2
Incidents · South China Seasurge	12	182.7	8	42	3.3× / 3.6
Quakes · Coral Seasurge	11	35.2	0	—	9.2× / 1.2
Incidents · North Atlantic Ocean	10	274.8	8	60	1.5× / 6.6
Quakes · South Pacific Ocean	10	27.7	1	29	1.0× / 10.2
Exercises · Japan Seasurge	8	78	2	33	2.5× / 3.2
Exercises · South Atlantic Ocean	8	40.5	0	—	1.4× / 5.6
Cable ops · Persian Gulfsurge	8	35.8	2	19	20× / 0.4
Nav aids · South Atlantic Oceanlong running	7	358.4	10	894	1.1× / 6.4
Exercises · Bay of Bengal	7	79	2	53	1.0× / 6.8
Quakes · Indian Oceansurge	7	21	0	—	2.5× / 2.8
Cable ops · Arabian Seasurge	6	113.9	3	109	2.5× / 2.4
Incidents · Coral Seasurge	6	6.6	0	—	3.3× / 1.8
Nav aids · North Atlantic Ocean	5	77.8	2	292	1.9× / 2.6
Missiles · North Pacific Ocean	5	63.6	3	61	0.8× / 6.2
Exercises · Arabian Sea	5	52.5	3	33	1.1× / 4.6
Missiles · South Pacific Oceannew	5	8.2	2	16	new / 0
Exercises · Yellow Sea	4	38.6	1	33	1.0× / 4
Incidents · South Pacific Ocean	4	36.7	1	33	0.4× / 10.4
Incidents · Bay of Bengalsurge	4	34.9	3	19	6.7× / 0.6
Piracy · Gulf of Adensurge	4	33.7	0	—	4.0× / 1
Exercises · South Pacific Oceansurge	4	17.2	0	—	2.9× / 1.4
Debris · Coral Seasurge	4	12	0	—	20× / 0.2
Nav aids · English Channel	4	7.8	0	—	1.2× / 3.4
Cable ops · Mediterranean Sea - Eastern Basin	3	126.7	5	49	1.1× / 2.8
Incidents · Arabian Sea	3	51.4	1	68	1.7× / 1.8
Nav aids · Indian Ocean	3	48.1	2	36	1.4× / 2.2
Incidents · Gulf of Mexicosurge	3	48	3	21	3.8× / 0.8
Surveys · South Atlantic Oceansurge	3	46.5	2	99	2.5× / 1.2
Incidents · Indian Ocean	3	41.1	1	51	0.6× / 4.8
Nav aids · Gulf of Mexico	3	40	0	—	1.9× / 1.6
Nav aids · North Pacific Ocean	3	35.4	1	35	0.7× / 4.4
Ordnance · South China Seanew	3	16	0	—	new / 0
Missiles · Bay of Bengalsurge	3	11.5	3	6	7.5× / 0.4
Other · Coral Seasurge	3	10.3	1	18	7.5× / 0.4
Nav aids · Coral Seasurge	3	8.9	1	35	5.0× / 0.6
Nav aids · Celtic Sea	3	8.6	0	—	1.1× / 2.8
Exercises · Indian Oceansurge	3	7.7	0	—	3.8× / 0.8
Nav aids · Gulf of Alaska	3	5.7	0	—	1.9× / 1.6
Other · Tasman Seasurge	3	0.6	0	—	15× / 0.2
Exercises · Aegean Sealong running	2	158.1	5	397	0.5× / 4
Cable ops · North Atlantic Ocean	2	82.1	2	101	0.7× / 3
Incidents · Caribbean Sea	2	58.6	1	56	3.3× / 0.6
Other · Mediterranean Sea - Eastern Basinlong running	2	55.9	3	384	2.0× / 1
Surveys · Davis Straitnew	2	55	2	27	new / 0
Incidents · Adriatic Seanew	2	43.3	1	24	new / 0
Incidents · Mediterranean Sea - Western Basinnew	2	41.1	1	64	new / 0
Cable ops · Bay of Bengal	2	37.5	1	49	0.8× / 2.6
Exercises · Laccadive Sea	2	33.1	1	32	0.2× / 9.2
Incidents · Mediterranean Sea - Eastern Basin	2	27.8	1	15	1.0× / 2
Cable ops · Tasman Sea	2	21.6	1	21	2.0× / 1
Piracy · Mozambique Channelnew	2	20.7	0	—	new / 0
Spills · Gulf of Mexico	2	15	1	26	0.4× / 5.4
Incidents · Philippine Sea	2	13	0	—	0.3× / 6
Restricted · North Atlantic Ocean	2	12.1	1	28	5.0× / 0.4
Missiles · Barentsz Seanew	2	7.5	2	3	new / 0
Quakes · North Pacific Ocean	2	7.5	0	—	0.3× / 6.8
Cable ops · Indian Ocean	2	7.4	0	—	2.0× / 1
Incidents · Solomon Sea	2	7.1	0	—	5.0× / 0.4
Derelicts · Coral Seanew	2	6	0	—	new / 0
Quakes · Philippine Sea	2	5.5	1	19	1.4× / 1.4
Nav aids · Caribbean Sea	2	4.1	1	4	2.5× / 0.8
Exercises · Persian Gulfnew	2	4	0	—	new / 0
Ordnance · Persian Gulf	2	3.7	0	—	10× / 0.2
Wrecks · South China Sealong running	1	154.8	4	1,286	2.5× / 0.4
Ordnance · North Sealong running	1	81.6	2	822	2.5× / 0.4
Other · Persian Gulf	1	65	2	167	new / 0
Nav aids · Inner Seas off the West Coast of Scotland	1	62.4	2	114	0.2× / 4.4
Cable ops · Caribbean Sea	1	46.6	2	171	1.3× / 0.8
Cable ops · Gulf of Guinea	1	43.3	2	32	1.0× / 1
Ordnance · Mediterranean Sea - Eastern Basin	1	32.6	2	57	5.0× / 0.2
Cable ops · Red Sea	1	31	1	66	5.0× / 0.2
Surveys · Arabian Sea	1	25.4	1	52	1.3× / 0.8
Cable ops · North Pacific Ocean	1	19.6	0	—	1.3× / 0.8
Spills · North Atlantic Ocean	1	18	1	34	0.3× / 4
Surveys · Tasman Sea	1	17.1	1	17	5.0× / 0.2
Piracy · South China Sea	1	14.5	1	36	5.0× / 0.2
Nav aids · Red Sea	1	14.3	1	14	new / 0
Wrecks · Irish Sea and St. George's Channel	1	13.8	0	—	2.5× / 0.4
Incidents · Japan Sea	1	12.5	1	12	5.0× / 0.2
Cable ops · Aegean Sea	1	12.4	0	—	2.5× / 0.4
Incidents · Persian Gulf	1	10.7	0	—	5.0× / 0.2
Piracy · Malacca Strait	1	10.6	0	—	5.0× / 0.2
Derelicts · Ionian Sea	1	9.8	0	—	5.0× / 0.2
Incidents · South Atlantic Ocean	1	9	0	—	0.3× / 3
Spills · Arabian Sea	1	8.1	0	—	new / 0
Spills · Gulf of Alaska	1	7	1	7	2.5× / 0.4
Derelicts · Celtic Sea	1	6.7	0	—	5.0× / 0.2
Exercises · Mediterranean Sea - Eastern Basin	1	6	0	—	1.7× / 0.6
Missiles · Baffin Bay	1	5.8	1	5	new / 0
Quakes · North Atlantic Ocean	1	5.7	0	—	1.3× / 0.8
Ordnance · Laccadive Sea	1	5.4	0	—	new / 0
Cable ops · English Channel	1	5.3	0	—	1.0× / 1
Piracy · Red Sea	1	4.4	0	—	new / 0
Exercises · Coral Sea	1	3.6	0	—	5.0× / 0.2
Quakes · Banda Sea	1	3	0	—	0.5× / 2
Incidents · Great Australian Bight	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	5.0× / 0.2
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	5.0× / 0.2
Quakes · Molukka Sea	1	3	0	—	0.3× / 3.2
Debris · North Atlantic Ocean	1	3	0	—	1.3× / 0.8
Derelicts · Philippine Sea	1	3	0	—	new / 0
Derelicts · Sea of Okhotsk	1	3	0	—	new / 0
Other · South Atlantic Ocean	1	3	0	—	1.3× / 0.8
Derelicts · South China Sea	1	3	0	—	1.3× / 0.8
Derelicts · Tasman Sea	1	3	0	—	1.7× / 0.6
Ordnance · Indian Ocean	1	2.7	0	—	new / 0
Quakes · Norwegian Sea	1	2.7	1	2	new / 0
Surveys · North Pacific Ocean	1	2.5	1	2	5.0× / 0.2
Quakes · Southern Ocean	1	2.5	1	2	1.3× / 0.8
Exercises · North Atlantic Ocean	1	2.2	1	2	0.4× / 2.8
Nav aids · Bristol Channel	1	2.1	0	—	1.3× / 0.8
Ordnance · North Pacific Ocean	1	1.6	1	1	new / 0
Incidents · Red Sea	1	1.6	1	1	5.0× / 0.2
Incidents · Bismarck Sea	1	1.5	0	—	1.7× / 0.6
Piracy · Gulf of Oman	1	1.5	1	1	new / 0
Derelicts · Indian Ocean	1	1.1	0	—	0.6× / 1.6
Missiles · Laccadive Sea	1	1.1	0	—	5.0× / 0.2
Nav aids · Bass Strait	1	0.9	0	—	1.3× / 0.8
Nav aids · Irish Sea and St. George's Channel	1	0.9	0	—	0.3× / 3
Nav aids · Laccadive Sea	1	0.9	0	—	1.7× / 0.6
Other · North Pacific Ocean	1	0.8	0	—	1.0× / 1
Debris · Timor Sea	1	0.8	1	0	new / 0
Surveys · Indian Ocean	1	0.7	1	0	1.3× / 0.8
Other · Celtic Sea	1	0.2	0	—	5.0× / 0.2
Ordnance · Philippine Sea	1	0.2	0	—	new / 0
Incidents · Malacca Strait	1	0.1	0	—	new / 0
Surveys · Arctic Oceanlong running	0	682	22	2,580	0.0× / 0.2
Surveys · Beaufort Sealong running	0	341	11	2,580	— / 0
Nav aids · South Pacific Oceanlong running	0	155	5	382	0.0× / 2
Wrecks · The Northwestern Passages	0	124	4	213	— / 0
Surveys · Laptev Sealong running	0	93	3	1,714	— / 0
Incidents · Mozambique Channel	0	93	3	40	— / 0
Nav aids · Arabian Sealong running	0	74.5	2	411	0.0× / 1.2
Surveys · Baffin Bay	0	62	2	213	— / 0
Surveys · Chukchi Sealong running	0	62	2	2,113	— / 0
Ordnance · English Channel	0	62	2	321	— / 0
Nav aids · Mediterranean Sea - Western Basin	0	62	2	189	0.0× / 0.2
Wrecks · North Sea	0	62	2	255	0.0× / 1.2
Exercises · South China Sea	0	57.8	0	—	0.0× / 0.4
Nav aids · Bay of Bengal	0	56.9	0	—	— / 0
Wrecks · Arabian Sealong running	0	35.6	1	411	— / 0
Missiles · Aegean Sea	0	31	1	32	— / 0
Other · Arctic Ocean	0	31	1	211	— / 0
Surveys · Bering Sea	0	31	1	170	— / 0
Cable ops · Ceram Sea	0	31	1	38	0.0× / 0.2
Wrecks · English Channel	0	31	1	40	0.0× / 0.4
Surveys · Greenland Sealong running	0	31	1	2,896	— / 0
Wrecks · Gulf of Guinea	0	31	1	47	— / 0
Cable ops · Gulf of Mexico	0	31	1	79	0.0× / 0.8
Nav aids · Gulf of Suez	0	31	1	272	0.0× / 0.2
Other · Gulf of Suez	0	31	1	167	— / 0
Wrecks · Indian Ocean	0	31	1	132	— / 0
Nav aids · Mediterranean Sea - Eastern Basin	0	31	1	104	0.0× / 0.4
Wrecks · Mediterranean Sea - Eastern Basin	0	31	1	189	0.0× / 0.6
Surveys · Mozambique Channel	0	31	1	52	— / 0
Wrecks · North Atlantic Ocean	0	31	1	138	0.0× / 0.2
Nav aids · Persian Gulf	0	31	1	65	0.0× / 0.2
Piracy · Persian Gulflong running	0	31	1	1,118	0.0× / 0.2
Restricted · Persian Gulf	0	31	1	60	— / 0
Wrecks · Persian Gulf	0	31	1	38	0.0× / 0.6
Volcanic · Philippine Sea	0	31	1	339	0.0× / 1
Wrecks · South Atlantic Ocean	0	31	1	264	— / 0
Other · South China Sealong running	0	31	1	929	0.0× / 0.2
Wrecks · South Pacific Ocean	0	31	1	44	— / 0
Other · The Northwestern Passages	0	31	1	184	— / 0
Surveys · The Northwestern Passageslong running	0	31	1	878	— / 0
Exercises · Philippine Sea	0	30.4	0	—	0.0× / 1.4
Surveys · Mediterranean Sea - Eastern Basin	0	20	0	—	0.0× / 4
Cable ops · Sea of Marmara	0	17.4	0	—	0.0× / 0.2
Other · Andaman or Burma Sea	0	16.8	0	—	— / 0
Wrecks · Laccadive Sea	0	16.8	0	—	— / 0
Surveys · North Sea	0	8.4	0	—	0.0× / 0.2
Piracy · Singapore Strait	0	8	0	—	— / 0
Incidents · Tyrrhenian Sea	0	7.4	0	—	0.0× / 0.6
Wrecks · Bay of Bengal	0	4.6	0	—	— / 0
Derelicts · North Atlantic Ocean	0	1.4	0	—	0.0× / 0.6
Incidents · Tasman Sea	0	0.5	0	—	0.0× / 2.4
Derelicts · Great Australian Bight	0	0.4	0	—	— / 0
Icebergs · Southern Ocean	0	0.1	0	—	0.0× / 3.8
Cable ops · Andaman or Burma Sea	0	0	0	—	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2011-01, 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.