Sea Ledger, December 2009

2009-12-01 to 2009-12-31 · archive

issued: 364
warning-days in force: 7,614
in force at month end: 234
sea × type cells: 185

baseline: same month, previous 5 years (2008-12, 2007-12, 2006-12, 2005-12, 2004-12)

By type

type	issued	warning-days	in force at end
Exercises	76	766.8	17
Cable ops	64	1,101	38
Incidents	58	849.8	25
Nav aids	45	1,293	36
Quakes	33	95.2	4
Derelicts	21	84.5	5
Other	15	446.3	17
Piracy	14	166.8	8
Surveys	9	2,031.8	64
Spills	7	122.4	2
Icebergs	7	19.2	0
Missiles	5	62	2
Debris	4	40.2	1
Wrecks	3	399.3	12
Containers	3	8.7	0
Ordnance	0	62	2
Restricted	0	33.6	0
Volcanic	0	31	1

By sea and type · 185 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Oceanlong running	33	242.6	7	418	1.9× / 17.8
Incidents · North Atlantic Oceansurge	22	319	9	59	3.9× / 5.6
Incidents · North Pacific Ocean	15	160.7	5	63	1.5× / 10.2
Exercises · North Pacific Ocean	13	86.9	1	41	1.9× / 6.8
Nav aids · North Seasurge	12	107.6	4	294	2.1× / 5.8
Quakes · South Pacific Ocean	11	26.3	3	33	0.9× / 12.8
Exercises · South Atlantic Oceansurge	10	77.7	0	—	3.3× / 3
Exercises · North Atlantic Ocean	9	54.8	1	90	1.1× / 7.8
Exercises · Arabian Seasurge	8	58.5	1	31	3.1× / 2.6
Exercises · Japan Seasurge	7	52.8	1	36	3.9× / 1.8
Exercises · Bay of Bengal	6	51.8	2	34	0.9× / 6.6
Exercises · Yellow Sea	6	38	1	36	1.6× / 3.8
Nav aids · South Atlantic Oceanlong running	5	315.1	11	772	1.7× / 3
Missiles · North Pacific Ocean	5	62	2	32	0.9× / 5.4
Piracy · Arabian Seanew	5	32.8	2	49	new / 0
Derelicts · North Atlantic Ocean	5	23.8	1	29	1.8× / 2.8
Exercises · Aegean Sea	4	128.6	8	342	1.7× / 2.4
Incidents · Indian Ocean	4	86.9	2	50	1.7× / 2.4
Nav aids · North Atlantic Oceansurge	4	71.3	3	306	2.9× / 1.4
Piracy · Indian Oceannew	4	63.9	1	48	new / 0
Exercises · Laccadive Sea	4	53.2	1	33	0.6× / 6.6
Cable ops · Bay of Bengal	4	48.5	2	55	1.7× / 2.4
Derelicts · South Atlantic Ocean	4	26.9	1	34	1.8× / 2.2
Quakes · Philippine Sea	4	13.1	1	33	1.7× / 2.4
Quakes · Indian Ocean	4	12.3	0	—	0.5× / 7.4
Nav aids · North Pacific Oceansurge	4	5.8	0	—	2.5× / 1.6
Nav aids · Gulf of Alaskasurge	4	3.8	0	—	6.7× / 0.6
Cable ops · Mediterranean Sea - Eastern Basin	3	74.8	4	99	0.7× / 4.4
Incidents · Caribbean Seasurge	3	64.4	3	74	3.8× / 0.8
Cable ops · North Atlantic Ocean	3	64.3	4	117	1.1× / 2.6
Nav aids · Celtic Sea	3	58	1	45	1.7× / 1.8
Spills · Gulf of Mexico	3	42	0	—	0.6× / 5
Nav aids · Gulf of Mexicosurge	3	34.1	1	41	7.5× / 0.4
Cable ops · Singapore Straitnew	3	31.4	1	37	new / 0
Cable ops · North Seasurge	3	16.3	1	32	2.1× / 1.4
Derelicts · North Pacific Ocean	3	13.2	0	—	1.7× / 1.8
Incidents · Bay of Biscaysurge	3	4.1	1	28	3.8× / 0.8
Other · Mediterranean Sea - Eastern Basinlong running	2	139	5	449	2.5× / 0.8
Nav aids · English Channel	2	109.1	3	259	0.9× / 2.2
Exercises · South China Sea	2	90	0	—	2.0× / 1
Surveys · South Atlantic Ocean	2	85.9	2	175	0.7× / 2.8
Cable ops · Arabian Sea	2	77.5	2	69	0.7× / 3
Other · South Atlantic Ocean	2	55.3	2	311	2.0× / 1
Surveys · Mediterranean Sea - Eastern Basin	2	52.7	1	53	1.7× / 1.2
Cable ops · Java Sea	2	50.2	1	70	2.0× / 1
Incidents · Gulf of Mexiconew	2	48.6	2	38	new / 0
Exercises · Philippine Sea	2	45.9	1	43	1.0× / 2
Wrecks · Arabian Sea	2	34.2	2	18	10× / 0.2
Cable ops · Caribbean Sea	2	32.5	1	87	10× / 0.2
Cable ops · South China Sea	2	31.5	1	73	5.0× / 0.4
Spills · Caribbean Seanew	2	28	0	—	new / 0
Nav aids · Inner Seas off the West Coast of Scotland	2	16.4	0	—	0.9× / 2.2
Exercises · Arctic Ocean	2	12.3	0	—	3.3× / 0.6
Incidents · South Atlantic Ocean	2	8	0	—	0.5× / 3.8
Derelicts · Arafura Seanew	2	6	0	—	new / 0
Quakes · Banda Sea	2	6	0	—	2.0× / 1
Quakes · Japan Sea	2	6	0	—	10× / 0.2
Quakes · North Atlantic Ocean	2	6	0	—	1.7× / 1.2
Icebergs · North Atlantic Oceannew	2	6	0	—	new / 0
Quakes · South Atlantic Ocean	2	6	0	—	5.0× / 0.4
Derelicts · Caribbean Sea	2	5.9	1	6	2.0× / 1
Containers · North Pacific Ocean	2	5.7	0	—	1.4× / 1.4
Derelicts · Indian Ocean	2	4.9	1	21	2.5× / 0.8
Icebergs · South Pacific Ocean	2	4.2	0	—	0.9× / 2.2
Other · Arabian Sea	2	4.1	0	—	3.3× / 0.6
Other · North Pacific Ocean	2	3.4	0	—	2.5× / 0.8
Nav aids · Irish Sea and St. George's Channellong running	1	98.1	3	438	0.3× / 3.6
Cable ops · Mediterranean Sea - Western Basin	1	67.9	2	122	5.0× / 0.2
Nav aids · Coral Sealong running	1	67.3	2	667	0.2× / 4.2
Surveys · Gulf of Suezlong running	1	49.5	1	701	5.0× / 0.2
Other · Indian Ocean	1	39.5	2	218	5.0× / 0.2
Surveys · Irish Sea and St. George's Channel	1	37.6	2	52	new / 0
Other · Adriatic Sea	1	31	1	100	new / 0
Cable ops · Ceram Sea	1	29.2	1	29	new / 0
Cable ops · Gulf of Suez	1	15.4	1	15	2.5× / 0.4
Nav aids · Arabian Sea	1	15.3	1	15	0.3× / 3
Cable ops · Yellow Sea	1	13.7	0	—	2.5× / 0.4
Incidents · Mediterranean Sea - Eastern Basin	1	13.6	0	—	0.4× / 2.8
Nav aids · Singapore Strait	1	12.9	0	—	5.0× / 0.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	12	1	12	2.5× / 0.4
Piracy · Banda Sea	1	11.6	0	—	new / 0
Other · Great Australian Bight	1	11.5	1	11	5.0× / 0.2
Other · Gulf of Aden	1	10.5	1	10	new / 0
Piracy · Singapore Strait	1	10.5	1	10	5.0× / 0.2
Surveys · Sulu Sea	1	9.7	1	9	new / 0
Spills · Gulf of Alaska	1	9	1	9	new / 0
Exercises · South Pacific Ocean	1	8.2	0	—	0.3× / 3
Piracy · Gulf of Thailand	1	7.6	1	7	new / 0
Surveys · Baltic Sea	1	7.3	0	—	new / 0
Surveys · Bay of Bengal	1	6.7	0	—	2.5× / 0.4
Exercises · Andaman or Burma Sea	1	6.4	0	—	1.3× / 0.8
Cable ops · Strait of Gibraltar	1	5.9	0	—	new / 0
Incidents · Timor Sea	1	5.2	1	5	5.0× / 0.2
Incidents · Bismarck Sea	1	5	0	—	new / 0
Wrecks · North Sea	1	4.9	0	—	0.8× / 1.2
Cable ops · Eastern China Sea	1	3.2	0	—	1.3× / 0.8
Piracy · Gulf of Aden	1	3.2	1	3	2.5× / 0.4
Incidents · Solomon Sea	1	3.2	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	5.0× / 0.2
Quakes · Coral Sea	1	3	0	—	0.8× / 1.2
Debris · Gulf of Mexico	1	3	0	—	5.0× / 0.2
Icebergs · Indian Ocean	1	3	0	—	5.0× / 0.2
Derelicts · Molukka Sea	1	3	0	—	new / 0
Other · North Atlantic Ocean	1	3	0	—	1.7× / 0.6
Quakes · North Pacific Ocean	1	3	0	—	0.1× / 7.2
Containers · North Sea	1	3	0	—	5.0× / 0.2
Quakes · Savu Sea	1	3	0	—	new / 0
Quakes · Sea of Okhotsk	1	3	0	—	5.0× / 0.2
Quakes · Solomon Sea	1	3	0	—	0.8× / 1.2
Debris · South Atlantic Ocean	1	3	0	—	1.7× / 0.6
Icebergs · South Atlantic Ocean	1	3	0	—	0.2× / 4.8
Debris · South Pacific Ocean	1	3	0	—	5.0× / 0.2
Icebergs · Southern Ocean	1	3	0	—	0.4× / 2.6
Piracy · South China Sea	1	1.8	1	1	5.0× / 0.2
Exercises · Gulf of Alaska	1	1.7	0	—	new / 0
Other · Bay of Bengal	1	1.3	1	1	5.0× / 0.2
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	1.1	0	—	1.0× / 1
Other · Caribbean Sea	1	1	0	—	new / 0
Derelicts · South China Sea	1	0.8	0	—	0.6× / 1.8
Incidents · Arafura Sea	1	0.7	0	—	5.0× / 0.2
Cable ops · English Channel	1	0.4	1	0	new / 0
Nav aids · Great Australian Bight	1	0.3	0	—	1.0× / 1
Debris · North Atlantic Ocean	1	0.2	0	—	2.5× / 0.4
Incidents · Coral Sea	1	0.1	0	—	0.6× / 1.8
Incidents · Eastern China Sea	1	0.1	0	—	new / 0
Derelicts · Laccadive Sea	1	0	1	0	new / 0
Surveys · Beaufort Sealong running	0	713	23	2,184	— / 0
Surveys · Arctic Oceanlong running	0	465	15	2,184	— / 0
Cable ops · Gulf of Mexico	0	201.2	6	72	0.0× / 0.6
Surveys · Baffin Baylong running	0	155	5	2,282	— / 0
Surveys · The Northwestern Passageslong running	0	155	5	1,167	— / 0
Nav aids · Gulf of Suezlong running	0	111.5	3	608	0.0× / 0.6
Surveys · Laptev Sealong running	0	93	3	1,318	— / 0
Wrecks · The Northwestern Passageslong running	0	93	3	481	— / 0
Nav aids · Gulf of California	0	73.9	0	—	0.0× / 1
Wrecks · North Atlantic Oceanlong running	0	62	2	583	— / 0
Nav aids · Sea of Okhotsk	0	62	2	176	— / 0
Wrecks · South China Sealong running	0	62	2	890	0.0× / 0.2
Cable ops · South Pacific Ocean	0	62	2	46	0.0× / 0.2
Incidents · South China Sea	0	46.8	1	65	0.0× / 6.6
Wrecks · Persian Gulflong running	0	42.4	1	412	0.0× / 0.4
Incidents · South Pacific Ocean	0	35	1	81	0.0× / 10.4
Wrecks · Laccadive Sea	0	34.4	0	—	— / 0
Restricted · North Atlantic Ocean	0	33.6	0	—	0.0× / 0.6
Debris · Arctic Oceanlong running	0	31	1	1,836	0.0× / 0.2
Other · Arctic Oceanlong running	0	31	1	849	— / 0
Wrecks · Bay of Bengal	0	31	1	314	— / 0
Surveys · Bering Sealong running	0	31	1	441	— / 0
Other · Bismarck Sealong running	0	31	1	379	0.0× / 0.2
Surveys · Chukchi Sealong running	0	31	1	1,717	— / 0
Other · Coral Sealong running	0	31	1	406	— / 0
Surveys · Greenland Sealong running	0	31	1	2,500	— / 0
Ordnance · Gulf of Aden	0	31	1	290	— / 0
Wrecks · Inner Seas off the West Coast of Scotland	0	31	1	76	0.0× / 0.6
Surveys · Malacca Straitlong running	0	31	1	513	0.0× / 0.2
Nav aids · Mediterranean Sea - Western Basin	0	31	1	72	0.0× / 1.8
Ordnance · North Sealong running	0	31	1	426	— / 0
Cable ops · Persian Gulf	0	31	1	108	0.0× / 0.4
Piracy · Persian Gulflong running	0	31	1	722	— / 0
Volcanic · Philippine Sea	0	31	1	236	0.0× / 0.8
Nav aids · Red Sealong running	0	31	1	468	0.0× / 0.2
Other · South China Sealong running	0	31	1	533	— / 0
Surveys · Tasman Sea	0	31	1	36	— / 0
Surveys · Timor Sea	0	31	1	170	— / 0
Nav aids · Malacca Strait	0	28.7	0	—	— / 0
Incidents · Arabian Sea	0	18.5	0	—	0.0× / 0.8
Incidents · Malacca Strait	0	18.5	0	—	— / 0
Nav aids · South China Sea	0	18.5	0	—	— / 0
Spills · North Pacific Ocean	0	16	0	—	0.0× / 1.4
Other · North Sea	0	15.8	0	—	0.0× / 1.2
Nav aids · South Pacific Ocean	0	15.8	0	—	0.0× / 1
Incidents · Bering Sea	0	11.4	0	—	— / 0
Spills · Indian Ocean	0	11.4	0	—	— / 0
Surveys · North Pacific Ocean	0	11	0	—	0.0× / 0.2
Other · English Channel	0	6.9	0	—	0.0× / 0.6
Nav aids · Bay of Bengal	0	4.4	0	—	0.0× / 0.8
Wrecks · Coral Sea	0	4.4	0	—	0.0× / 0.2
Surveys · Indian Ocean	0	4.4	0	—	0.0× / 2.2
Piracy · Mozambique Channel	0	4.4	0	—	— / 0
Spills · North Atlantic Ocean	0	4	0	—	0.0× / 2.2
Cable ops · Gulf of Guinea	0	1.5	0	—	0.0× / 1
Quakes · Molukka Sea	0	1.5	0	—	0.0× / 0.6
Exercises · Gulf of Aden	0	0	0	—	— / 0
Surveys · Gulf of Guinea	0	0	0	—	— / 0
Exercises · Ionian Sea	0	0	0	—	0.0× / 1

Cite: seahazards.com Sea Ledger, 2009-12, 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.