Sea Ledger, April 2009

2009-04-01 to 2009-04-30 · archive

issued: 323
warning-days in force: 7,675
in force at month end: 244
sea × type cells: 199

baseline: same month, previous 5 years (2008-04, 2007-04, 2006-04, 2005-04, 2004-04)

By type

type	issued	warning-days	in force at end
Cable ops	57	993	27
Exercises	55	567.9	11
Incidents	44	622.5	17
Quakes	37	117.1	1
Nav aids	35	1,590	55
Surveys	22	2,243.6	78
Other	14	464.9	17
Derelicts	14	85.2	1
Spills	12	158	8
Icebergs	10	55.7	2
Piracy	8	74.1	4
Missiles	4	60	2
Containers	4	21.6	0
Restricted	2	1	2
Debris	2	36.8	1
Volcanic	1	101.9	3
Ordnance	1	72.5	2
Structures	1	58.5	2
Wrecks	0	350.8	11

By sea and type · 199 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Ocean	31	246.8	6	173	1.4× / 21.4
Exercises · North Pacific Ocean	9	64.9	1	41	0.8× / 11.4
Quakes · South Pacific Ocean	9	27	0	—	0.7× / 12.4
Icebergs · Southern Oceansurge	8	46	2	23	40× / 0.2
Nav aids · South Atlantic Oceansurgelong running	6	237.4	11	527	2.7× / 2.2
Nav aids · North Sea	6	201.3	6	264	1.9× / 3.2
Nav aids · North Pacific Oceansurgelong running	6	128.1	4	446	30× / 0.2
Spills · North Pacific Oceansurge	6	68	3	28	15× / 0.4
Exercises · Yellow Seasurge	6	44.1	1	28	2.5× / 2.4
Exercises · Japan Seasurge	6	38.2	1	28	2.0× / 3
Incidents · South Pacific Ocean	6	34.3	2	25	0.8× / 7.2
Exercises · South Atlantic Ocean	6	31.1	1	29	1.4× / 4.4
Cable ops · Arabian Sea	5	132.5	4	56	1.8× / 2.8
Cable ops · Bay of Bengal	5	115.4	3	131	1.8× / 2.8
Incidents · North Atlantic Ocean	5	92.9	3	69	1.5× / 3.4
Exercises · Bay of Bengal	5	48.3	0	—	1.0× / 5
Surveys · Mozambique Channelnew	5	26	2	23	new / 0
Quakes · Indian Ocean	5	15	0	—	0.6× / 7.8
Quakes · North Pacific Ocean	5	15	0	—	1.0× / 4.8
Incidents · Indian Ocean	4	94.8	2	73	1.3× / 3
Missiles · North Pacific Ocean	4	60	2	32	0.8× / 5.2
Other · Mediterranean Sea - Eastern Basinsurgelong running	4	57.8	3	522	6.7× / 0.6
Incidents · South Atlantic Ocean	4	56.1	2	64	0.8× / 5
Spills · Gulf of Mexico	4	48	3	43	1.1× / 3.6
Exercises · North Atlantic Ocean	4	43.7	0	—	0.6× / 6.6
Incidents · Coral Sea	4	15.2	0	—	1.0× / 4
Quakes · Banda Seasurge	4	12	0	—	2.9× / 1.4
Nav aids · English Channel	3	66.5	3	50	1.9× / 1.6
Cable ops · South China Sea	3	61.4	2	50	1.9× / 1.6
Surveys · Arabian Seanew	3	51.7	3	24	new / 0
Exercises · Laccadive Sea	3	47.8	1	36	0.4× / 8
Exercises · Philippine Seasurge	3	40.6	1	33	2.5× / 1.2
Incidents · Philippine Sea	3	30.5	1	28	0.4× / 8
Cable ops · Gulf of Suezsurge	3	29.2	2	46	3.8× / 0.8
Surveys · Tasman Seasurge	3	28.7	1	25	5.0× / 0.6
Surveys · Indian Oceansurge	3	27.9	1	24	5.0× / 0.6
Piracy · South China Seanew	3	23.3	2	27	new / 0
Derelicts · Arafura Seasurge	3	16.3	0	—	7.5× / 0.4
Piracy · Indian Oceannew	3	12.6	1	22	new / 0
Quakes · Philippine Sea	3	11.6	0	—	1.1× / 2.8
Nav aids · Coral Sealong running	2	121.5	4	422	0.6× / 3.2
Nav aids · Inner Seas off the West Coast of Scotland	2	64.3	2	139	0.5× / 3.8
Cable ops · North Atlantic Ocean	2	57.7	1	95	0.6× / 3.4
Incidents · Bay of Bengal	2	56.5	2	29	3.3× / 0.6
Exercises · South China Sea	2	40.5	1	33	2.5× / 0.8
Surveys · South Atlantic Ocean	2	39.6	1	33	0.4× / 4.8
Other · North Sea	2	31.2	1	29	1.3× / 1.6
Other · Celtic Sea	2	26.3	1	24	10× / 0.2
Incidents · Mozambique Channel	2	17.8	0	—	5.0× / 0.4
Incidents · South China Sea	2	17.1	1	42	0.9× / 2.2
Incidents · Arabian Sea	2	13.6	1	18	2.5× / 0.8
Derelicts · South China Sea	2	13.6	0	—	3.3× / 0.6
Exercises · South Pacific Ocean	2	10.6	0	—	0.5× / 4
Icebergs · South Pacific Ocean	2	9.7	0	—	10× / 0.2
Containers · English Channelnew	2	8.7	0	—	new / 0
Quakes · South Atlantic Ocean	2	6	0	—	1.7× / 1.2
Quakes · Southern Ocean	2	6	0	—	2.5× / 0.8
Exercises · Mediterranean Sea - Eastern Basin	2	4.8	0	—	0.7× / 2.8
Exercises · Gulf of Mexico	2	2.1	0	—	10× / 0.2
Nav aids · Celtic Sea	2	1.3	0	—	1.7× / 1.2
Nav aids · North Atlantic Ocean	1	91.6	3	271	0.4× / 2.6
Incidents · North Pacific Ocean	1	71.8	1	69	0.1× / 10.4
Nav aids · Irish Sea and St. George's Channel	1	63.1	2	193	0.5× / 2
Nav aids · Gulf of Mexicolong running	1	60	2	391	0.5× / 2
Incidents · Adriatic Sea	1	42.3	0	—	5.0× / 0.2
Cable ops · Gulf of Guinea	1	39.3	1	76	new / 0
Nav aids · South Pacific Ocean	1	33.4	1	56	0.6× / 1.8
Other · South China Sea	1	32	1	288	new / 0
Cable ops · Mediterranean Sea - Western Basin	1	30.3	1	59	0.8× / 1.2
Other · Inner Seas off the West Coast of Scotland	1	30	1	42	2.5× / 0.4
Surveys · Irish Sea and St. George's Channel	1	30	1	43	new / 0
Other · Ionian Sea	1	29.5	1	29	new / 0
Structures · North Sea	1	28.5	1	28	new / 0
Nav aids · Mediterranean Sea - Western Basin	1	27.5	0	—	0.6× / 1.8
Incidents · Gulf of Guinea	1	25.2	1	25	2.5× / 0.4
Cable ops · Mediterranean Sea - Eastern Basin	1	22.4	1	51	0.3× / 3.2
Other · North Atlantic Ocean	1	19.7	0	—	0.8× / 1.2
Spills · North Atlantic Ocean	1	18	1	39	0.4× / 2.4
Surveys · English Channel	1	17.4	1	17	5.0× / 0.2
Surveys · Black Sea	1	15.3	1	15	1.3× / 0.8
Cable ops · Japan Sea	1	14.6	0	—	5.0× / 0.2
Incidents · Andaman or Burma Sea	1	14.1	0	—	5.0× / 0.2
Cable ops · North Sea	1	14	0	—	0.5× / 2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	1	14	2.5× / 0.4
Cable ops · Singapore Strait	1	12.6	1	12	2.5× / 0.4
Ordnance · Persian Gulf	1	12.5	0	—	new / 0
Incidents · Malacca Strait	1	12.2	0	—	new / 0
Derelicts · Bay of Bengal	1	12.1	0	—	5.0× / 0.2
Exercises · Baltic Sea	1	10.1	0	—	0.7× / 1.4
Surveys · Bay of Bengal	1	8.4	1	8	1.0× / 1
Piracy · Malacca Strait	1	8	0	—	new / 0
Derelicts · Indian Ocean	1	7.1	0	—	1.3× / 0.8
Derelicts · Coral Sea	1	6.9	0	—	new / 0
Derelicts · Tasman Sea	1	6.7	0	—	5.0× / 0.2
Containers · North Pacific Ocean	1	6.6	0	—	1.7× / 0.6
Surveys · South Pacific Ocean	1	6.6	1	6	5.0× / 0.2
Debris · Arafura Sea	1	6.4	0	—	new / 0
Derelicts · Arabian Sea	1	6.3	0	—	5.0× / 0.2
Derelicts · Caribbean Sea	1	6.3	0	—	new / 0
Containers · North Atlantic Ocean	1	6.3	0	—	1.7× / 0.6
Other · Laccadive Sea	1	6.2	1	6	2.5× / 0.4
Exercises · Bay of Biscay	1	6.1	0	—	new / 0
Derelicts · South Pacific Ocean	1	6.1	0	—	1.7× / 0.6
Cable ops · Celtic Sea	1	5.4	0	—	0.5× / 2.2
Exercises · Arabian Sea	1	5	0	—	0.4× / 2.8
Volcanic · Japan Sea	1	5	0	—	new / 0
Other · Arafura Sea	1	4.8	1	4	new / 0
Nav aids · Great Australian Bight	1	4.7	1	4	0.7× / 1.4
Exercises · Andaman or Burma Sea	1	4	0	—	2.5× / 0.4
Exercises · Kara Sea	1	4	0	—	new / 0
Incidents · Eastern China Sea	1	3.9	1	3	new / 0
Incidents · Tasman Sea	1	3.8	0	—	0.4× / 2.4
Incidents · Bay of Biscay	1	3.4	0	—	1.0× / 1
Incidents · Bismarck Sea	1	3.1	0	—	new / 0
Quakes · Arabian Sea	1	3	0	—	5.0× / 0.2
Quakes · Bismarck Sea	1	3	0	—	1.7× / 0.6
Quakes · Coral Sea	1	3	0	—	0.2× / 5.6
Quakes · Molukka Sea	1	3	0	—	1.0× / 1
Quakes · Sea of Okhotsk	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	0.1× / 7
Cable ops · Sea of Marmara	1	2.5	1	2	2.5× / 0.4
Derelicts · English Channel	1	2.2	0	—	new / 0
Quakes · North Atlantic Ocean	1	2.2	1	2	1.3× / 0.8
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	2	0	—	5.0× / 0.2
Derelicts · Mediterranean Sea - Western Basin	1	1.6	1	1	2.5× / 0.4
Surveys · North Sea	1	1.2	0	—	1.7× / 0.6
Restricted · Black Sea	1	0.7	1	0	new / 0
Nav aids · Gulf of Alaska	1	0.5	0	—	5.0× / 0.2
Debris · North Sea	1	0.4	0	—	new / 0
Incidents · Caribbean Sea	1	0.3	0	—	5.0× / 0.2
Restricted · North Atlantic Ocean	1	0.3	1	0	2.5× / 0.4
Piracy · Gulf of Aden	1	0.2	0	—	new / 0
Surveys · Beaufort Sealong running	0	720	24	1,939	— / 0
Surveys · Arctic Oceanlong running	0	480	16	1,939	0.0× / 0.2
Surveys · Baffin Baylong running	0	180	6	2,037	— / 0
Surveys · The Northwestern Passageslong running	0	180	6	922	— / 0
Exercises · Aegean Sea	0	120	4	97	0.0× / 2.6
Nav aids · Gulf of Suez	0	93.4	3	363	0.0× / 0.8
Nav aids · Gulf of California	0	90	3	160	0.0× / 0.2
Surveys · Laptev Sealong running	0	90	3	1,073	— / 0
Wrecks · Persian Gulf	0	90	3	167	0.0× / 0.2
Wrecks · The Northwestern Passages	0	90	3	236	— / 0
Cable ops · Indian Ocean	0	60	2	195	0.0× / 0.2
Nav aids · Indian Oceanlong running	0	60	2	399	0.0× / 1.6
Volcanic · Indian Ocean	0	60	2	316	— / 0
Nav aids · Malacca Strait	0	60	2	290	— / 0
Surveys · Malacca Strait	0	60	2	295	— / 0
Nav aids · Red Sea	0	60	2	223	— / 0
Other · South Atlantic Ocean	0	47.4	1	66	0.0× / 1
Surveys · Gulf of Mexico	0	37.4	0	—	— / 0
Debris · Arctic Oceanlong running	0	30	1	1,591	— / 0
Other · Arctic Oceanlong running	0	30	1	604	— / 0
Wrecks · Bay of Bengal	0	30	1	69	— / 0
Surveys · Bering Sea	0	30	1	196	0.0× / 0.2
Other · Bismarck Sea	0	30	1	134	— / 0
Nav aids · Black Sea	0	30	1	52	— / 0
Cable ops · Caribbean Sea	0	30	1	61	0.0× / 0.6
Other · Caribbean Sea	0	30	1	57	0.0× / 0.2
Surveys · Chukchi Sealong running	0	30	1	1,472	0.0× / 0.2
Other · Coral Sea	0	30	1	161	0.0× / 0.2
Surveys · Greenland Sealong running	0	30	1	2,255	— / 0
Ordnance · Gulf of Aden	0	30	1	45	— / 0
Other · Gulf of Aqaba	0	30	1	95	— / 0
Surveys · Gulf of Guinea	0	30	1	77	0.0× / 0.2
Cable ops · Gulf of Mexico	0	30	1	128	0.0× / 1
Surveys · Gulf of Suezlong running	0	30	1	456	0.0× / 0.2
Other · Indian Ocean	0	30	1	316	0.0× / 0.2
Surveys · Inner Seas off the West Coast of Scotland	0	30	1	43	0.0× / 0.2
Wrecks · Inner Seas off the West Coast of Scotland	0	30	1	132	— / 0
Wrecks · Laccadive Sealong running	0	30	1	394	0.0× / 0.2
Surveys · Mediterranean Sea - Eastern Basin	0	30	1	147	0.0× / 1.6
Structures · North Atlantic Ocean	0	30	1	79	— / 0
Wrecks · North Atlantic Ocean	0	30	1	338	— / 0
Ordnance · North Sea	0	30	1	181	0.0× / 1.4
Nav aids · Persian Gulf	0	30	1	163	— / 0
Piracy · Persian Gulflong running	0	30	1	477	— / 0
Surveys · Persian Gulf	0	30	1	247	0.0× / 1
Volcanic · Philippine Sea	0	30	1	88	0.0× / 1
Nav aids · Sea of Okhotsk	0	30	1	108	— / 0
Nav aids · South China Sealong running	0	30	1	403	— / 0
Wrecks · South China Sealong running	0	30	1	645	— / 0
Cable ops · Tasman Sea	0	25.5	0	—	0.0× / 0.6
Cable ops · Black Sea	0	22.6	0	—	0.0× / 0.8
Wrecks · South Atlantic Ocean	0	20.8	0	—	— / 0
Cable ops · South Pacific Ocean	0	17.4	0	—	0.0× / 1.6
Cable ops · Eastern China Sea	0	12	0	—	0.0× / 0.6
Cable ops · Sulu Sea	0	11.4	0	—	0.0× / 0.2
Volcanic · South Pacific Ocean	0	6.9	0	—	— / 0
Incidents · Mediterranean Sea - Eastern Basin	0	6.8	0	—	0.0× / 3.6
Spills · Gulf of Alaska	0	5	0	—	— / 0
Incidents · Mediterranean Sea - Western Basin	0	3.4	0	—	0.0× / 0.2
Nav aids · Mozambique Channel	0	3.4	0	—	0.0× / 0.8
Surveys · North Atlantic Ocean	0	3.4	0	—	0.0× / 2.2
Incidents · Sea of Okhotsk	0	3.4	0	—	— / 0
Quakes · Bering Sea	0	3	0	—	0.0× / 1.4
Spills · Caribbean Sea	0	3	0	—	0.0× / 0.6
Exercises · Bering Sea	0	2	0	—	0.0× / 1.4
Spills · Persian Gulf	0	2	0	—	— / 0
Quakes · Gulf of Alaska	0	1.3	0	—	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2009-04, 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.