Sea Ledger, May 2011

2011-05-01 to 2011-05-31 · archive

issued: 422
warning-days in force: 7,404
in force at month end: 229
sea × type cells: 190

baseline: same month, previous 5 years (2010-05, 2009-05, 2008-05, 2007-05, 2006-05)

By type

type	issued	warning-days	in force at end
Incidents	78	1,088.1	36
Exercises	74	774	26
Cable ops	69	1,161.8	35
Quakes	45	148	1
Nav aids	44	1,073.8	39
Piracy	35	268.3	4
Missiles	17	191.3	3
Derelicts	13	59.2	3
Surveys	12	1,512	39
Other	8	375.3	12
War risk	5	50.9	5
Debris	5	12.5	1
Spills	5	49	3
Restricted	2	33.7	1
Icebergs	2	5.9	0
Ordnance	2	103.7	4
Wrecks	2	382.5	13
Volcanic	1	45	2
Towing	1	2	0
Structures	1	62.9	2
Containers	1	3	0
Mines	0	1.5	0

By sea and type · 190 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Oceanlong running	28	219.8	6	934	1.3× / 22
Piracy · Arabian Seasurge	22	138.1	1	31	28× / 0.8
Incidents · North Pacific Ocean	13	158.7	6	40	1.6× / 8.4
Incidents · North Atlantic Ocean	12	227.4	7	70	1.6× / 7.6
Quakes · North Pacific Oceansurge	12	47.3	0	—	2.6× / 4.6
Quakes · South Pacific Ocean	11	33	0	—	0.9× / 12
Nav aids · South Atlantic Oceansurgelong running	10	269	10	1,014	2.1× / 4.8
Incidents · South Pacific Ocean	10	160.1	4	47	1.3× / 7.8
Exercises · Philippine Seasurge	10	89.5	3	34	3.3× / 3
Exercises · North Pacific Ocean	10	59.8	3	35	0.9× / 10.8
Exercises · Japan Seasurge	9	82.7	2	33	2.0× / 4.4
Piracy · Indian Oceansurge	8	80.1	0	—	2.1× / 3.8
Exercises · South Atlantic Ocean	8	44.1	3	33	1.0× / 7.8
Incidents · Coral Sea	8	14.7	0	—	1.8× / 4.4
Cable ops · North Atlantic Ocean	7	54.9	2	31	1.6× / 4.4
Incidents · Indian Oceansurge	7	38.4	2	53	3.2× / 2.2
Cable ops · Bay of Bengalsurge	6	125.4	4	68	2.3× / 2.6
Exercises · South Pacific Ocean	6	21.3	1	37	1.5× / 4
Cable ops · Persian Gulfsurge	5	107.4	3	139	25× / 0.2
Incidents · South Atlantic Ocean	5	88.3	2	42	1.3× / 4
Exercises · South China Seasurge	5	72.2	1	34	6.3× / 0.8
War risk · Mediterranean Sea - Eastern Basinnew	5	50.9	5	25	new / 0
Quakes · Solomon Seasurge	5	15.3	0	—	2.3× / 2.2
Nav aids · Coral Sea	5	7.2	0	—	1.8× / 2.8
Incidents · Caribbean Seasurge	4	138.5	5	67	4.0× / 1
Nav aids · North Pacific Oceansurge	4	129.9	5	155	2.5× / 1.6
Nav aids · English Channel	4	108.6	5	112	1.5× / 2.6
Cable ops · Gulf of Mexicosurge	4	74.6	3	60	2.0× / 2
Cable ops · North Seasurge	4	72.9	2	45	4.0× / 1
Nav aids · North Atlantic Oceanlong running	4	72.8	3	412	1.5× / 2.6
Incidents · Gulf of Mexicosurge	4	52.6	4	42	5.0× / 0.8
Missiles · North Pacific Ocean	4	51	1	60	0.6× / 6.8
Exercises · Bay of Bengal	4	38.4	1	35	0.7× / 6.2
Exercises · Laccadive Sea	4	37.6	1	33	0.7× / 6
Exercises · Yellow Sea	4	37.4	1	33	0.9× / 4.4
Missiles · North Atlantic Ocean	4	28.3	0	—	1.7× / 2.4
Missiles · Barentsz Seanew	4	25.9	0	—	new / 0
Piracy · Red Seanew	4	17.4	2	11	new / 0
Quakes · Coral Sea	4	12	0	—	1.8× / 2.2
Quakes · Indian Ocean	4	11.2	1	27	1.0× / 4
Derelicts · North Pacific Oceansurge	4	9.1	0	—	10× / 0.4
Cable ops · South China Sea	3	110.5	4	67	1.5× / 2
Exercises · Arabian Sea	3	79.6	3	63	0.8× / 4
Surveys · South Atlantic Oceansurge	3	73.2	3	34	2.5× / 1.2
Nav aids · North Sea	3	57.2	3	79	0.7× / 4.6
Cable ops · Tasman Seasurge	3	49.1	2	50	3.0× / 1
Nav aids · South Pacific Oceansurge	3	37.7	1	96	3.0× / 1
Spills · North Atlantic Ocean	3	29	1	23	1.4× / 2.2
Derelicts · South Pacific Ocean	3	25	2	31	1.9× / 1.6
Quakes · Philippine Sea	3	9	0	—	1.9× / 1.6
Incidents · Tasman Sea	3	8.1	1	19	1.7× / 1.8
Nav aids · Celtic Sea	2	101	3	83	2.0× / 1
Incidents · South China Sea	2	57	1	37	0.9× / 2.2
Cable ops · South Pacific Ocean	2	35.9	1	66	10× / 0.2
Exercises · North Atlantic Ocean	2	20.1	0	—	0.2× / 9.8
Incidents · Andaman or Burma Seanew	2	19.8	2	11	new / 0
Cable ops · Celtic Sea	2	14.4	0	—	1.7× / 1.2
Cable ops · Gulf of Guinea	2	13.7	0	—	3.3× / 0.6
Missiles · Arctic Oceannew	2	11.2	0	—	new / 0
Derelicts · Caribbean Seanew	2	7.6	1	15	new / 0
Surveys · Black Sea	2	7.2	1	14	5.0× / 0.4
Quakes · Gulf of Alaska	2	6	0	—	3.3× / 0.6
Icebergs · South Pacific Ocean	2	5.9	0	—	10× / 0.2
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	2	3.8	0	—	3.3× / 0.6
Debris · Indian Ocean	2	3.5	1	25	10× / 0.2
Incidents · Philippine Sea	2	0.4	0	—	0.5× / 3.8
Other · Persian Gulf	1	60.5	2	287	new / 0
Surveys · Davis Strait	1	52.2	1	147	new / 0
Surveys · Persian Gulf	1	51.8	2	50	1.7× / 0.6
Ordnance · North Sealong running	1	37.6	1	942	0.6× / 1.6
Other · Mediterranean Sea - Eastern Basin	1	35.7	1	53	1.3× / 0.8
Ordnance · Ionian Sea	1	33.8	2	63	new / 0
Other · North Sea	1	33	1	85	0.8× / 1.2
Cable ops · Mediterranean Sea - Eastern Basin	1	32.3	2	42	0.3× / 3.2
Nav aids · Mediterranean Sea - Eastern Basin	1	32	1	224	new / 0
Incidents · Bay of Biscay	1	31.9	1	43	new / 0
Nav aids · Gulf of Mexico	1	31.6	1	59	0.3× / 4
Missiles · South Atlantic Ocean	1	31.6	1	32	new / 0
Wrecks · Arabian Sealong running	1	31.1	2	531	5.0× / 0.2
Surveys · Mediterranean Sea - Eastern Basin	1	28.8	0	—	0.4× / 2.8
Surveys · Mozambique Channel	1	28.5	1	28	2.5× / 0.4
Nav aids · Andaman or Burma Sea	1	22.4	1	22	new / 0
Other · North Atlantic Ocean	1	19.9	1	19	0.5× / 2
Other · South Atlantic Ocean	1	19.9	1	19	0.6× / 1.8
Volcanic · South Pacific Ocean	1	14	1	14	new / 0
Nav aids · Caribbean Sea	1	13.8	1	88	1.3× / 0.8
Spills · North Pacific Ocean	1	13	1	13	0.6× / 1.8
Piracy · Gulf of Aden	1	12.8	1	33	1.0× / 1
Exercises · Andaman or Burma Sea	1	8.4	0	—	1.3× / 0.8
Cable ops · Aegean Sea	1	8	0	—	new / 0
Incidents · Laccadive Sea	1	7.5	1	7	5.0× / 0.2
Missiles · South Pacific Ocean	1	7.2	0	—	new / 0
Spills · Bering Sea	1	7	1	7	new / 0
Other · Laccadive Sea	1	6.7	0	—	5.0× / 0.2
Exercises · Adriatic Sea	1	6.4	0	—	1.7× / 0.6
Surveys · Bay of Bengal	1	5.5	1	5	1.3× / 0.8
Missiles · Laccadive Sea	1	5.1	0	—	new / 0
Nav aids · Laccadive Sea	1	5	0	—	new / 0
Exercises · Indian Ocean	1	4.6	0	—	2.5× / 0.4
Exercises · Barentsz Sea	1	4.5	0	—	new / 0
Surveys · Sea of Azov	1	4.5	1	4	new / 0
Exercises · Alboran Sea	1	4.3	1	4	new / 0
Exercises · Coral Sea	1	4.2	0	—	new / 0
Wrecks · Southern Ocean	1	3.9	0	—	new / 0
Nav aids · Bristol Channel	1	3.2	0	—	1.0× / 1
Derelicts · Arabian Sea	1	3	0	—	2.5× / 0.4
Debris · Arafura Sea	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	1.7× / 0.6
Debris · Caribbean Sea	1	3	0	—	2.5× / 0.4
Quakes · Gulf of Tomini	1	3	0	—	2.5× / 0.4
Derelicts · Laccadive Sea	1	3	0	—	5.0× / 0.2
Quakes · North Atlantic Ocean	1	3	0	—	0.8× / 1.2
Containers · North Pacific Ocean	1	3	0	—	new / 0
Quakes · South Atlantic Ocean	1	3	0	—	1.0× / 1
Debris · South Pacific Ocean	1	3	0	—	5.0× / 0.2
Derelicts · Tasman Sea	1	3	0	—	5.0× / 0.2
Incidents · Solomon Sea	1	2.8	0	—	new / 0
Exercises · Gulf of Mexico	1	2.5	0	—	0.8× / 1.2
Derelicts · Arafura Sea	1	2	0	—	new / 0
Towing · South Atlantic Ocean	1	2	0	—	new / 0
Restricted · Gulf of Guinea	1	1.9	0	—	new / 0
Incidents · Mozambique Channel	1	1.3	0	—	2.5× / 0.4
Structures · Mediterranean Sea - Eastern Basin	1	0.9	0	—	2.5× / 0.4
Restricted · North Atlantic Ocean	1	0.8	0	—	1.0× / 1
Exercises · Bering Sea	1	0.7	0	—	2.5× / 0.4
Exercises · Mediterranean Sea - Eastern Basin	1	0.7	1	0	0.5× / 2.2
Surveys · Tasman Sea	1	0.7	1	0	5.0× / 0.2
Cable ops · Barentsz Sea	1	0.4	1	0	new / 0
Other · Coral Sea	1	0.1	0	—	new / 0
Other · Tasman Sea	1	0.1	0	—	5.0× / 0.2
Incidents · Timor Sea	1	0.1	0	—	5.0× / 0.2
Incidents · Davis Strait	1	0	0	—	2.5× / 0.4
Nav aids · Gulf of Alaska	1	0	0	—	1.0× / 1
Surveys · Arctic Oceanlong running	0	607.4	15	2,700	— / 0
Surveys · Beaufort Sealong running	0	266.4	4	2,700	0.0× / 0.2
Exercises · Aegean Sea	0	155	5	152	0.0× / 2
Surveys · Laptev Sealong running	0	93	3	1,834	0.0× / 0.4
Wrecks · South China Sea	0	93	3	252	— / 0
Wrecks · The Northwestern Passages	0	93	3	333	— / 0
Nav aids · Arabian Sealong running	0	63.6	2	531	0.0× / 1
Surveys · Baffin Bay	0	62	2	333	— / 0
Other · North Pacific Ocean	0	62	2	75	0.0× / 0.2
Cable ops · Arabian Sea	0	61	1	78	0.0× / 2.4
Surveys · Indian Ocean	0	58.4	1	120	0.0× / 1
Surveys · Chukchi Sealong running	0	51.3	1	2,233	— / 0
Other · South China Sealong running	0	44.4	1	1,049	0.0× / 0.2
Wrecks · South Pacific Ocean	0	37.5	1	164	— / 0
Ordnance · Mediterranean Sea - Eastern Basin	0	31.1	1	70	— / 0
Missiles · Aegean Sea	0	31	1	152	— / 0
Other · Arctic Ocean	0	31	1	331	— / 0
Other · Bay of Bengal	0	31	1	36	— / 0
Surveys · Bering Sea	0	31	1	290	— / 0
Cable ops · Caribbean Sea	0	31	1	291	0.0× / 0.6
Nav aids · Gulf of Suezlong running	0	31	1	392	0.0× / 0.6
Structures · Indian Ocean	0	31	1	80	— / 0
Nav aids · Irish Sea and St. George's Channel	0	31	1	94	0.0× / 3.2
Wrecks · Laccadive Sea	0	31	1	60	— / 0
Cable ops · North Pacific Ocean	0	31	1	110	0.0× / 0.4
Structures · North Sea	0	31	1	112	— / 0
Surveys · North Sea	0	31	1	70	0.0× / 1.2
Wrecks · North Sealong running	0	31	1	375	0.0× / 0.4
Cable ops · Norwegian Sea	0	31	1	42	0.0× / 1.2
Restricted · Persian Gulf	0	31	1	180	0.0× / 0.2
Wrecks · Persian Gulf	0	31	1	158	0.0× / 0.4
Volcanic · Philippine Sealong running	0	31	1	459	0.0× / 0.2
Cable ops · Red Sea	0	31	1	85	0.0× / 0.2
Nav aids · Red Sea	0	31	1	134	— / 0
Wrecks · South Atlantic Oceanlong running	0	31	1	384	0.0× / 0.6
Other · The Northwestern Passages	0	31	1	304	— / 0
Cable ops · Laccadive Sea	0	29	0	—	0.0× / 0.4
Incidents · Japan Sea	0	26.8	0	—	— / 0
Incidents · Mediterranean Sea - Eastern Basin	0	26.8	0	—	0.0× / 1.2
Incidents · Bering Sea	0	20.4	0	—	— / 0
Surveys · Greenland Sea	0	20.3	0	—	— / 0
Surveys · The Northwestern Passages	0	20.3	0	—	— / 0
Cable ops · Mediterranean Sea - Western Basin	0	20	0	—	0.0× / 0.2
Piracy · South China Sea	0	19.9	0	—	0.0× / 0.6
Nav aids · Bay of Bengal	0	15.5	0	—	0.0× / 0.4
Surveys · South China Sea	0	10	0	—	— / 0
Cable ops · Ceram Sea	0	8.5	0	—	0.0× / 0.4
Incidents · Eastern China Sea	0	6.5	0	—	0.0× / 0.2
Derelicts · South China Sea	0	6.5	0	—	0.0× / 1
Nav aids · Tasman Sea	0	6.5	0	—	0.0× / 1.2
Surveys · Laccadive Sea	0	5	0	—	0.0× / 0.4
Quakes · Bismarck Sea	0	2.2	0	—	0.0× / 0.6
Mines · Mediterranean Sea - Eastern Basin	0	1.5	0	—	— / 0
Surveys · North Atlantic Ocean	0	1.5	0	—	0.0× / 2
Ordnance · North Pacific Ocean	0	1.2	0	—	— / 0
Surveys · Gulf of Aqaba	0	1	0	—	— / 0
Surveys · Gulf of Mexico	0	1	0	—	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2011-05, 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.