Sea Ledger, May 2009

2009-05-01 to 2009-05-31 · archive

issued: 345
warning-days in force: 7,570
in force at month end: 233
sea × type cells: 191

baseline: same month, previous 5 years (2008-05, 2007-05, 2006-05, 2005-05, 2004-05)

By type

type	issued	warning-days	in force at end
Exercises	88	633.8	17
Cable ops	61	843.1	23
Nav aids	41	1,506.2	45
Incidents	40	590.3	19
Quakes	29	85.4	4
Surveys	18	2,314.9	78
Other	11	501.8	13
Derelicts	11	56.9	2
Spills	11	162	4
Icebergs	8	56.6	0
Missiles	7	62	2
Restricted	4	43.1	1
Piracy	4	57.5	3
Wrecks	4	365.9	13
Containers	3	19	0
Structures	2	60.6	2
Volcanic	1	93	3
Debris	1	37.9	1
Ordnance	1	80.4	3

By sea and type · 191 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Ocean	33	232.4	7	204	1.6× / 20.6
Exercises · North Atlantic Ocean	12	60.2	1	27	1.1× / 10.6
Exercises · South Atlantic Oceansurge	12	58.3	1	35	2.9× / 4.2
Quakes · South Pacific Ocean	11	33	0	—	1.0× / 11
Exercises · North Pacific Ocean	10	63.9	1	35	1.0× / 9.8
Exercises · Yellow Seasurge	8	46.2	2	37	2.9× / 2.8
Exercises · Bay of Bengal	8	36.2	1	30	1.7× / 4.8
Spills · Gulf of Mexicosurge	7	98	3	44	2.1× / 3.4
Incidents · North Pacific Ocean	7	80.8	3	66	0.7× / 9.8
Nav aids · Gulf of Mexicosurge	7	65.5	0	—	4.4× / 1.6
Missiles · North Pacific Ocean	7	62	2	61	1.3× / 5.6
Exercises · Laccadive Sea	7	42.7	2	35	1.0× / 6.8
Nav aids · South Atlantic Oceansurgelong running	6	264.7	8	558	3.3× / 1.8
Incidents · North Atlantic Ocean	6	115.5	3	65	1.9× / 3.2
Icebergs · Southern Oceansurge	6	49.2	0	—	4.3× / 1.4
Exercises · Japan Seasurge	6	33.8	2	37	3.0× / 2
Exercises · Arabian Seasurge	6	15.4	2	30	2.1× / 2.8
Nav aids · North Sea	5	195.8	8	295	1.5× / 3.4
Incidents · South Pacific Ocean	5	82.3	2	33	0.7× / 7.6
Surveys · Mediterranean Sea - Eastern Basinsurge	5	57.8	2	178	2.5× / 2
Incidents · South Atlantic Ocean	5	30.2	1	58	1.3× / 3.8
Cable ops · Arabian Sea	4	108.7	4	87	1.7× / 2.4
Nav aids · North Atlantic Ocean	4	100.5	4	302	1.1× / 3.6
Nav aids · Inner Seas off the West Coast of Scotland	4	61.6	2	170	1.3× / 3.2
Derelicts · South Atlantic Oceansurge	4	16.8	0	—	2.2× / 1.8
Quakes · North Pacific Ocean	4	12	1	21	0.8× / 4.8
Restricted · Japan Seanew	4	11.6	0	—	new / 0
Cable ops · Irish Sea and St. George's Channelnew	4	7.2	0	—	new / 0
Nav aids · North Pacific Oceansurge	3	64	0	—	5.0× / 0.6
Cable ops · South China Sea	3	63.8	1	48	1.9× / 1.6
Cable ops · Norwegian Seasurge	3	59.1	2	30	5.0× / 0.6
Exercises · Gulf of Mexicosurge	3	29.8	0	—	7.5× / 0.4
Exercises · South Pacific Ocean	3	9.9	0	—	0.7× / 4.4
Incidents · Coral Sea	3	8.6	0	—	0.8× / 4
Quakes · Philippine Sea	3	8.2	1	18	1.7× / 1.8
Exercises · Mediterranean Sea - Eastern Basin	3	7.8	0	—	0.7× / 4.4
Nav aids · Gulf of Alaskasurge	3	0.9	1	7	15× / 0.2
Nav aids · English Channel	2	80.2	2	81	0.8× / 2.6
Cable ops · Bay of Bengal	2	75.9	2	162	1.4× / 1.4
Incidents · Indian Ocean	2	50	2	68	0.8× / 2.4
Incidents · Bay of Bengal	2	49.6	1	60	2.5× / 0.8
Incidents · South China Sea	2	43.1	2	44	1.0× / 2
Incidents · Mozambique Channelnew	2	37.4	2	30	new / 0
Exercises · Philippine Sea	2	32.1	0	—	1.7× / 1.2
Surveys · Irish Sea and St. George's Channel	2	28.6	1	37	5.0× / 0.4
Nav aids · South Pacific Ocean	2	28.1	2	36	1.3× / 1.6
Cable ops · Mediterranean Sea - Eastern Basin	2	21.4	1	46	0.6× / 3.6
Other · South Pacific Ocean	2	20.1	0	—	5.0× / 0.4
Derelicts · North Atlantic Ocean	2	13.5	1	29	0.8× / 2.4
Piracy · Indian Oceannew	2	12.1	0	—	new / 0
Other · English Channel	2	8.5	1	12	5.0× / 0.4
Derelicts · South Pacific Ocean	2	8.3	1	14	2.0× / 1
Quakes · Caribbean Seanew	2	6	0	—	new / 0
Quakes · Gulf of Alaska	2	6	0	—	10× / 0.2
Quakes · Indian Ocean	2	6	0	—	0.4× / 5.4
Exercises · Bering Sea	2	5.6	0	—	5.0× / 0.4
Quakes · Southern Ocean	2	4.7	1	6	10× / 0.2
Incidents · Mediterranean Sea - Eastern Basin	2	4.2	0	—	1.0× / 2
Surveys · South Atlantic Ocean	2	3.9	1	35	0.3× / 5.8
Surveys · North Sea	2	3.6	2	3	2.5× / 0.8
Nav aids · Coral Sealong running	1	116.4	3	453	0.4× / 2.6
Surveys · Indian Ocean	1	51.2	2	51	0.8× / 1.2
Ordnance · North Sea	1	49.4	2	212	0.7× / 1.4
Incidents · Arabian Sea	1	48.2	2	32	5.0× / 0.2
Wrecks · Inner Seas off the West Coast of Scotland	1	41.1	2	163	new / 0
Cable ops · Indian Ocean	1	38.6	1	226	1.7× / 0.6
Other · Indian Ocean	1	35.5	2	347	1.3× / 0.8
Cable ops · Caribbean Sea	1	31	1	92	2.5× / 0.4
Cable ops · Mediterranean Sea - Western Basin	1	31	1	46	1.3× / 0.8
Volcanic · Philippine Sea	1	31	1	119	new / 0
Exercises · South China Sea	1	30.9	1	35	5.0× / 0.2
Spills · North Pacific Ocean	1	30	0	—	0.5× / 2
Other · North Sea	1	25.5	0	—	0.6× / 1.6
Other · Black Sea	1	24.1	0	—	new / 0
Surveys · Inner Seas off the West Coast of Scotland	1	24.1	1	74	new / 0
Other · Gulf of Guinea	1	21.7	0	—	new / 0
Cable ops · Gulf of Guinea	1	20.9	0	—	new / 0
Cable ops · North Atlantic Ocean	1	20.9	0	—	0.3× / 3.4
Cable ops · Tasman Sea	1	15.9	0	—	2.5× / 0.4
Spills · North Atlantic Ocean	1	15	0	—	0.5× / 2.2
Surveys · Caribbean Sea	1	14.8	1	14	new / 0
Exercises · Caribbean Sea	1	14.3	0	—	5.0× / 0.2
Spills · South Pacific Ocean	1	14	0	—	new / 0
Cable ops · Philippine Sea	1	13.5	0	—	5.0× / 0.2
Cable ops · Red Sea	1	11	0	—	new / 0
Piracy · South China Sea	1	11	1	39	new / 0
Exercises · Indian Ocean	1	10.1	0	—	new / 0
Incidents · Red Sea	1	9	0	—	5.0× / 0.2
Surveys · North Pacific Ocean	1	8.7	1	8	2.5× / 0.4
Surveys · Laccadive Sea	1	8.4	0	—	new / 0
Cable ops · Yellow Sea	1	7.5	1	7	5.0× / 0.2
Exercises · Baltic Sea	1	7.3	0	—	1.3× / 0.8
Wrecks · English Channel	1	7	0	—	new / 0
Debris · Caribbean Sea	1	6.9	0	—	new / 0
Icebergs · South Pacific Ocean	1	6.8	0	—	new / 0
Derelicts · South China Sea	1	6.7	0	—	1.7× / 0.6
Surveys · Baltic Sea	1	6.6	0	—	new / 0
Other · North Pacific Ocean	1	6.6	0	—	new / 0
Nav aids · Bass Strait	1	6.5	0	—	5.0× / 0.2
Containers · English Channel	1	6.4	0	—	5.0× / 0.2
Containers · North Atlantic Ocean	1	6.4	0	—	2.5× / 0.4
Containers · Celtic Sea	1	6.2	0	—	5.0× / 0.2
Derelicts · North Sea	1	6.1	0	—	new / 0
Nav aids · Celtic Sea	1	5.5	0	—	1.7× / 0.6
Nav aids · Great Australian Bight	1	5.5	0	—	1.7× / 0.6
Spills · Gulf of Alaska	1	5	1	5	new / 0
Wrecks · Mediterranean Sea - Western Basin	1	4.9	0	—	new / 0
Structures · Mediterranean Sea - Eastern Basin	1	4.8	0	—	new / 0
Cable ops · Laccadive Sea	1	3.7	1	3	1.0× / 1
Exercises · Black Sea	1	3.5	0	—	0.4× / 2.6
Piracy · Gulf of Aden	1	3.4	1	3	new / 0
Quakes · Arctic Ocean	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.3× / 0.8
Wrecks · South Atlantic Ocean	1	2.9	1	2	2.5× / 0.4
Quakes · Coral Sea	1	2.7	1	2	0.5× / 2.2
Nav aids · Bristol Channel	1	2.6	0	—	0.8× / 1.2
Other · Inner Seas off the West Coast of Scotland	1	2.6	0	—	5.0× / 0.2
Incidents · Celtic Sea	1	2.4	1	2	5.0× / 0.2
Structures · Gulf of Mexico	1	2.4	1	2	5.0× / 0.2
Surveys · Philippine Sea	1	2.3	1	2	1.0× / 1
Incidents · Tasman Sea	1	2.3	0	—	0.6× / 1.6
Exercises · Andaman or Burma Sea	1	1.8	0	—	1.0× / 1
Other · North Atlantic Ocean	1	1	0	—	0.5× / 2
Icebergs · North Atlantic Ocean	1	0.6	0	—	0.6× / 1.8
Derelicts · Gulf of Mexico	1	0.5	0	—	1.0× / 1
Surveys · Beaufort Sealong running	0	744	24	1,970	0.0× / 0.2
Surveys · Arctic Oceanlong running	0	496	16	1,970	— / 0
Surveys · Baffin Baylong running	0	186	6	2,068	— / 0
Surveys · The Northwestern Passageslong running	0	186	6	953	— / 0
Exercises · Aegean Sea	0	124	4	128	0.0× / 2.4
Nav aids · Gulf of California	0	93	3	191	— / 0
Nav aids · Gulf of Suezlong running	0	93	3	394	0.0× / 0.2
Surveys · Laptev Sealong running	0	93	3	1,104	0.0× / 0.4
Other · Mediterranean Sea - Eastern Basin	0	93	3	235	0.0× / 1.4
Wrecks · Persian Gulf	0	93	3	198	0.0× / 0.4
Wrecks · The Northwestern Passages	0	93	3	267	— / 0
Surveys · Arabian Sea	0	72	2	55	0.0× / 0.2
Volcanic · Indian Ocean	0	62	2	347	— / 0
Nav aids · Malacca Strait	0	62	2	321	— / 0
Surveys · Malacca Strait	0	62	2	326	— / 0
Nav aids · Red Sea	0	62	2	254	0.0× / 0.2
Nav aids · Indian Oceanlong running	0	53.4	1	430	0.0× / 2.2
Nav aids · Irish Sea and St. George's Channel	0	50.6	1	224	0.0× / 3
Cable ops · Gulf of Suez	0	45	0	—	0.0× / 0.4
Debris · Arctic Oceanlong running	0	31	1	1,622	— / 0
Other · Arctic Oceanlong running	0	31	1	635	— / 0
Wrecks · Bay of Bengal	0	31	1	100	0.0× / 0.6
Surveys · Bering Sea	0	31	1	227	— / 0
Other · Bismarck Sea	0	31	1	165	— / 0
Other · Caribbean Sea	0	31	1	88	— / 0
Surveys · Chukchi Sealong running	0	31	1	1,503	— / 0
Other · Coral Sea	0	31	1	192	— / 0
Surveys · Greenland Sealong running	0	31	1	2,286	— / 0
Ordnance · Gulf of Aden	0	31	1	76	— / 0
Other · Gulf of Aqaba	0	31	1	126	— / 0
Surveys · Gulf of Guinea	0	31	1	108	— / 0
Cable ops · Gulf of Mexico	0	31	1	159	0.0× / 0.4
Surveys · Gulf of Suezlong running	0	31	1	487	— / 0
Wrecks · Laccadive Sealong running	0	31	1	425	— / 0
Restricted · North Atlantic Ocean	0	31	1	31	0.0× / 1.2
Structures · North Atlantic Ocean	0	31	1	110	— / 0
Wrecks · North Atlantic Oceanlong running	0	31	1	369	0.0× / 0.2
Nav aids · Persian Gulf	0	31	1	194	0.0× / 0.2
Piracy · Persian Gulflong running	0	31	1	508	— / 0
Surveys · Persian Gulf	0	31	1	278	0.0× / 0.8
Nav aids · Sea of Okhotsk	0	31	1	139	— / 0
Other · South Atlantic Ocean	0	31	1	97	0.0× / 1.4
Nav aids · South China Sealong running	0	31	1	434	0.0× / 0.2
Other · South China Sea	0	31	1	319	0.0× / 0.2
Wrecks · South China Sealong running	0	31	1	676	— / 0
Surveys · Tasman Sea	0	31	1	41	0.0× / 0.6
Other · Celtic Sea	0	22.4	0	—	0.0× / 0.2
Other · Laccadive Sea	0	22.4	0	—	0.0× / 0.2
Structures · North Sea	0	22.4	0	—	— / 0
Surveys · Black Sea	0	16	0	—	0.0× / 0.2
Incidents · Philippine Sea	0	15.3	0	—	0.0× / 4.6
Surveys · Mozambique Channel	0	11.8	0	—	0.0× / 0.4
Surveys · South Pacific Ocean	0	9.3	0	—	0.0× / 0.2
Incidents · Gulf of Guinea	0	8.4	0	—	0.0× / 0.6
Surveys · English Channel	0	6.8	0	—	0.0× / 0.8
Surveys · Bay of Bengal	0	5	0	—	0.0× / 1.2
Derelicts · Mediterranean Sea - Western Basin	0	5	0	—	0.0× / 0.2
Cable ops · Sea of Marmara	0	4.6	0	—	0.0× / 0.2
Incidents · Eastern China Sea	0	3	0	—	0.0× / 0.2
Other · Arafura Sea	0	1.4	0	—	— / 0
Nav aids · Black Sea	0	1.4	0	—	— / 0
Quakes · North Atlantic Ocean	0	0.8	0	—	0.0× / 1
Restricted · Black Sea	0	0.5	0	—	— / 0
Other · Ionian Sea	0	0	0	—	— / 0
Cable ops · Singapore Strait	0	0	0	—	— / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbia	0	0	0	—	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2009-05, 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.