Sea Ledger, December 2012

2012-12-01 to 2012-12-31 · archive

issued: 520
warning-days in force: 7,830
in force at month end: 228
sea × type cells: 215

baseline: same month, previous 5 years (2011-12, 2010-12, 2009-12, 2008-12, 2007-12)

By type

type	issued	warning-days	in force at end
Incidents	116	815.4	20
Cable ops	89	1,278.5	44
Exercises	78	750.3	10
Nav aids	68	2,030.1	71
Icebergs	39	56	1
Quakes	27	88.1	1
Surveys	23	1,065.5	31
Derelicts	23	131.1	3
Missiles	18	169.5	2
Other	9	255.5	7
Wrecks	9	655	22
Piracy	5	37.1	0
Containers	5	12.3	0
Spills	4	66	4
Debris	4	10.8	0
Ordnance	2	67.7	2
Restricted	1	217.3	6
War risk	0	62	2
Structures	0	31	1
Volcanic	0	31	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Ocean	52	248.4	9	102	1.8× / 29
Icebergs · Labrador Seanew	27	28.4	1	31	new / 0
Incidents · North Pacific Ocean	21	62.8	2	40	1.4× / 15.2
Nav aids · North Sea	19	327.8	12	325	1.2× / 15.6
Incidents · South China Seasurge	19	105.9	7	34	2.9× / 6.6
Incidents · Indian Oceansurge	18	31.1	2	42	3.8× / 4.8
Exercises · North Pacific Ocean	14	78.1	1	35	1.4× / 10.2
Exercises · Bay of Bengal	12	106.4	1	37	1.7× / 7.2
Incidents · South Pacific Ocean	11	57.2	1	37	1.5× / 7.2
Exercises · Mediterranean Sea - Eastern Basinsurge	11	34.5	1	28	6.9× / 1.6
Icebergs · South Atlantic Oceansurge	11	24.6	0	—	6.1× / 1.8
Surveys · South Atlantic Oceansurge	10	165.1	4	170	5.6× / 1.8
Incidents · North Atlantic Ocean	8	145.1	1	67	0.7× / 12.2
Exercises · Arabian Sea	8	73.4	1	35	1.8× / 4.4
Exercises · Yellow Sea	8	56.6	1	32	1.4× / 5.6
Nav aids · South Atlantic Oceanlong running	7	479.3	16	1,594	1.3× / 5.4
Quakes · South Pacific Ocean	7	24.8	0	—	0.6× / 11.2
Nav aids · North Atlantic Ocean	6	80.7	6	93	1.0× / 6.2
Exercises · South Atlantic Ocean	6	36.3	0	—	0.9× / 7
Incidents · Coral Sea	6	3.5	0	—	1.6× / 3.8
Nav aids · Gulf of Mexicosurgelong running	5	147.1	5	419	2.8× / 1.8
Exercises · Aegean Sealong running	5	133.1	1	366	1.8× / 2.8
Missiles · North Atlantic Oceansurge	5	22.4	0	—	13× / 0.4
Quakes · North Pacific Ocean	5	16.8	0	—	0.8× / 6.2
Cable ops · Black Seasurge	4	107.2	4	58	6.7× / 0.6
Nav aids · Celtic Sea	4	67.2	2	87	1.4× / 2.8
Cable ops · Indian Oceansurge	4	50.2	2	43	20× / 0.2
Missiles · Barentsz Seasurge	4	34.1	0	—	5.0× / 0.8
Nav aids · Inner Seas off the West Coast of Scotland	4	32.7	1	33	1.1× / 3.8
Incidents · South Atlantic Ocean	4	21.7	2	25	1.2× / 3.4
Derelicts · Indian Oceansurge	4	12	0	—	2.9× / 1.4
Derelicts · North Atlantic Ocean	4	11.7	1	30	1.1× / 3.8
Nav aids · Gulf of Alaskasurge	4	6.7	0	—	2.0× / 2
Cable ops · Bay of Bengal	3	156.8	6	70	0.9× / 3.4
Nav aids · English Channel	3	150.6	5	270	1.7× / 1.8
Cable ops · South China Seasurge	3	87.7	2	122	3.0× / 1
Cable ops · North Atlantic Ocean	3	84.2	3	147	0.6× / 5.4
Incidents · Caribbean Sea	3	84	1	65	1.4× / 2.2
Wrecks · Arabian Seasurge	3	55.2	3	120	7.5× / 0.4
Incidents · Bay of Bengalsurge	3	40.9	0	—	3.0× / 1
Surveys · Black Seanew	3	18.7	1	28	new / 0
Nav aids · Indian Oceansurge	3	18.6	0	—	15× / 0.2
Piracy · Gulf of Omannew	3	16	0	—	new / 0
Exercises · Black Seanew	3	9.4	0	—	new / 0
Quakes · Coral Sea	3	9	0	—	0.9× / 3.2
Containers · North Pacific Oceansurge	3	6.3	0	—	5.0× / 0.6
Incidents · Philippine Sea	3	1	1	15	1.7× / 1.8
Wrecks · North Sealong running	2	87.5	3	455	10× / 0.2
Nav aids · North Pacific Oceanlong running	2	87	4	596	0.6× / 3.2
Cable ops · Gulf of Guinea	2	78.9	3	47	1.1× / 1.8
Wrecks · Persian Gulf	2	77.7	3	118	5.0× / 0.4
Exercises · South China Sea	2	65.4	2	41	0.7× / 2.8
Cable ops · Andaman or Burma Sea	2	33.6	2	53	10× / 0.2
Incidents · Mozambique Channel	2	30.4	0	—	1.7× / 1.2
Cable ops · Ionian Seanew	2	25.2	0	—	new / 0
Incidents · Gulf of Mexico	2	23.5	1	35	3.3× / 0.6
Cable ops · Flores Seanew	2	20.4	0	—	new / 0
Spills · Gulf of Mexico	2	20	1	15	0.6× / 3.2
Cable ops · North Pacific Oceannew	2	19.9	1	19	new / 0
Other · Ligurian Seanew	2	19.8	0	—	new / 0
Cable ops · Yellow Sea	2	18	1	17	3.3× / 0.6
Incidents · Andaman or Burma Sea	2	17.6	0	—	3.3× / 0.6
Piracy · Gulf of Guineanew	2	13.6	0	—	new / 0
Derelicts · North Pacific Ocean	2	13.1	0	—	2.0× / 1
Incidents · Japan Seanew	2	12.9	0	—	new / 0
Surveys · Andaman or Burma Seanew	2	10.5	1	10	new / 0
Missiles · Eastern China Seanew	2	8.8	0	—	new / 0
Missiles · Laccadive Sea	2	6.3	0	—	5.0× / 0.4
Quakes · Molukka Sea	2	6	0	—	3.3× / 0.6
Quakes · Philippine Sea	2	6	0	—	0.9× / 2.2
Derelicts · Tasman Sea	2	6	0	—	10× / 0.2
Derelicts · Baltic Seanew	2	4.7	0	—	new / 0
Incidents · Bismarck Sea	2	4	0	—	10× / 0.2
Nav aids · Coral Sea	2	3.8	0	—	0.6× / 3.6
Derelicts · Arafura Sea	2	3	0	—	5.0× / 0.4
Ordnance · Bay of Bengalnew	2	3	0	—	new / 0
Nav aids · Great Australian Bight	2	2.3	0	—	1.7× / 1.2
Nav aids · Arabian Sealong running	1	126.9	5	570	1.3× / 0.8
Cable ops · Persian Gulf	1	124.9	4	347	new / 0
Wrecks · South Atlantic Oceanlong running	1	114.5	3	964	new / 0
Incidents · Mediterranean Sea - Eastern Basin	1	74.8	1	51	0.5× / 2
Cable ops · Gulf of Mexico	1	56.1	2	89	1.3× / 0.8
Nav aids · Kara Sealong running	1	56	2	481	new / 0
Surveys · North Pacific Ocean	1	46.6	1	150	new / 0
Cable ops · Alboran Sea	1	41	1	41	new / 0
Surveys · North Atlantic Ocean	1	39.6	1	111	0.7× / 1.4
Surveys · Mediterranean Sea - Eastern Basin	1	39.4	2	31	0.7× / 1.4
Missiles · North Pacific Ocean	1	35.7	1	31	0.2× / 6.2
Exercises · North Atlantic Ocean	1	35.1	0	—	0.2× / 6
Nav aids · Bristol Channel	1	31.8	1	327	2.5× / 0.4
Restricted · North Atlantic Ocean	1	31	1	196	2.5× / 0.4
Cable ops · Malacca Strait	1	28.6	1	28	5.0× / 0.2
Surveys · Chukchi Sea	1	28.3	1	28	5.0× / 0.2
Exercises · Laccadive Sea	1	28	1	35	0.5× / 2.2
Surveys · Mozambique Channel	1	25.3	1	25	5.0× / 0.2
Surveys · Sea of Azov	1	24.6	1	24	new / 0
Other · Mediterranean Sea - Eastern Basin	1	14.4	1	44	1.0× / 1
Incidents · Gulf of Thailand	1	13.6	0	—	new / 0
Surveys · Mediterranean Sea - Western Basin	1	13.2	0	—	new / 0
Wrecks · Indian Ocean	1	12.6	1	12	new / 0
Spills · North Atlantic Ocean	1	12	1	12	0.7× / 1.4
Cable ops · Banda Sea	1	11.6	1	11	new / 0
Cable ops · English Channel	1	11.3	0	—	5.0× / 0.2
Incidents · Laccadive Sea	1	10.9	0	—	1.7× / 0.6
Missiles · South Atlantic Ocean	1	10.7	0	—	1.3× / 0.8
Exercises · Indian Ocean	1	9.3	0	—	2.5× / 0.4
Surveys · Gulf of Mexico	1	9.1	0	—	5.0× / 0.2
Exercises · Baltic Sea	1	8.9	0	—	1.0× / 1
Missiles · Philippine Sea	1	8.5	0	—	1.7× / 0.6
Cable ops · Arabian Sea	1	7.3	1	7	0.3× / 4
Incidents · Java Sea	1	6.4	0	—	new / 0
Other · Inner Seas off the West Coast of Scotland	1	6.3	0	—	1.3× / 0.8
Other · Caribbean Sea	1	6	0	—	2.5× / 0.4
Derelicts · Gulf of Mexico	1	5.9	0	—	1.3× / 0.8
Missiles · Arctic Ocean	1	5.4	0	—	5.0× / 0.2
Missiles · Indian Ocean	1	5.4	0	—	5.0× / 0.2
Nav aids · Southern Ocean	1	5.4	0	—	new / 0
Incidents · Solomon Sea	1	5.3	0	—	5.0× / 0.2
Exercises · South Pacific Ocean	1	4.9	0	—	0.5× / 2.2
Debris · Indian Ocean	1	4.8	0	—	2.5× / 0.4
Quakes · Bismarck Sea	1	4.1	1	32	5.0× / 0.2
Exercises · Andaman or Burma Sea	1	4	0	—	1.7× / 0.6
Nav aids · Laccadive Sea	1	4	0	—	2.5× / 0.4
Cable ops · Tasman Sea	1	3.5	0	—	5.0× / 0.2
Quakes · Banda Sea	1	3.4	0	—	0.6× / 1.6
Exercises · North Sea	1	3.1	0	—	new / 0
Quakes · Arctic Ocean	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	2.5× / 0.4
Quakes · Black Sea	1	3	0	—	new / 0
Other · Coral Sea	1	3	0	—	1.7× / 0.6
Quakes · Gulf of Alaska	1	3	0	—	new / 0
Spills · Gulf of Alaska	1	3	1	3	2.5× / 0.4
Quakes · Gulf of Tomini	1	3	0	—	1.7× / 0.6
Debris · Japan Sea	1	3	0	—	new / 0
Derelicts · Laccadive Sea	1	3	0	—	5.0× / 0.2
Debris · North Atlantic Ocean	1	3	0	—	1.7× / 0.6
Containers · North Sea	1	3	0	—	5.0× / 0.2
Derelicts · Persian Gulf	1	3	0	—	new / 0
Derelicts · Philippine Sea	1	3	0	—	5.0× / 0.2
Quakes · Solomon Sea	1	3	0	—	0.7× / 1.4
Containers · South Atlantic Ocean	1	3	0	—	5.0× / 0.2
Icebergs · Southern Ocean	1	3	0	—	0.4× / 2.8
Exercises · Red Sea	1	2.3	1	2	new / 0
Derelicts · Bass Strait	1	2.2	0	—	5.0× / 0.2
Nav aids · Tasman Sea	1	1.4	0	—	2.5× / 0.4
Other · Indian Ocean	1	1.2	0	—	1.3× / 0.8
Derelicts · North Sea	1	1.2	0	—	new / 0
Incidents · Great Australian Bight	1	0.9	0	—	1.0× / 1
Derelicts · Arabian Sea	1	0.3	0	—	2.5× / 0.4
Nav aids · Arafura Sea	1	0.3	0	—	new / 0
Other · Bismarck Sea	1	0.3	0	—	5.0× / 0.2
Incidents · Bass Strait	1	0.2	0	—	5.0× / 0.2
Exercises · Coral Sea	1	0.2	0	—	1.7× / 0.6
Other · Kara Sea	1	0.2	0	—	new / 0
Incidents · Arafura Sea	1	0.1	0	—	2.5× / 0.4
Incidents · Timor Sea	1	0.1	0	—	5.0× / 0.2
Debris · Bass Strait	1	0	0	—	new / 0
Incidents · Tasman Sea	1	0	0	—	2.5× / 0.4
Surveys · Arctic Oceanlong running	0	325.1	8	913	— / 0
Surveys · Beaufort Sealong running	0	186	6	873	— / 0
Other · North Atlantic Ocean	0	70	2	133	0.0× / 0.4
Restricted · Black Sea	0	62	2	137	— / 0
Nav aids · Irish Sea and St. George's Channel	0	62	2	103	0.0× / 2.8
War risk · Mediterranean Sea - Eastern Basinlong running	0	62	2	586	— / 0
Wrecks · North Atlantic Oceanlong running	0	62	2	500	— / 0
Other · North Pacific Ocean	0	62	2	259	0.0× / 1
Ordnance · North Sealong running	0	62	2	1,522	0.0× / 0.2
Restricted · North Sealong running	0	62	2	497	0.0× / 0.2
Nav aids · Sea of Okhotsklong running	0	62	2	377	0.0× / 0.4
Nav aids · South China Sealong running	0	62	2	504	— / 0
Wrecks · South China Sea	0	62	2	326	— / 0
Surveys · The Northwestern Passages	0	62	2	147	— / 0
Wrecks · The Northwestern Passageslong running	0	62	2	848	— / 0
Nav aids · South Pacific Ocean	0	59.5	1	179	0.0× / 0.8
Other · Persian Gulflong running	0	38.5	1	477	— / 0
Incidents · Tyrrhenian Sea	0	38.5	1	351	0.0× / 0.2
Missiles · Aegean Sealong running	0	31	1	366	0.0× / 0.4
Surveys · Bering Sea	0	31	1	154	— / 0
Nav aids · Caribbean Sea	0	31	1	38	— / 0
Cable ops · Eastern China Sea	0	31	1	132	0.0× / 1.2
Nav aids · Eastern China Sea	0	31	1	321	— / 0
Nav aids · Gulf of California	0	31	1	86	0.0× / 1
Derelicts · Gulf of Oman	0	31	1	364	— / 0
Wrecks · Irish Sea and St. George's Channel	0	31	1	193	— / 0
Nav aids · Mediterranean Sea - Western Basinlong running	0	31	1	500	0.0× / 0.4
Other · North Sea	0	31	1	110	0.0× / 1.8
Structures · North Sealong running	0	31	1	504	— / 0
Nav aids · Persian Gulf	0	31	1	66	0.0× / 0.4
Volcanic · Philippine Sea	0	31	1	246	0.0× / 0.4
Wrecks · Philippine Sea	0	31	1	231	0.0× / 0.2
Surveys · Sea of Marmara	0	31	1	109	— / 0
Restricted · Sea of Okhotsklong running	0	31	1	445	— / 0
Spills · South Atlantic Oceanlong running	0	31	1	416	— / 0
Derelicts · South Pacific Ocean	0	31	1	187	0.0× / 1
Wrecks · Yellow Sealong running	0	31	1	378	0.0× / 0.2
Exercises · Ionian Sea	0	30.9	0	—	0.0× / 0.4
Exercises · Philippine Sea	0	30.4	0	—	0.0× / 3.8
Wrecks · English Channel	0	28.5	0	—	0.0× / 0.4
Cable ops · Irish Sea and St. George's Channel	0	27.7	0	—	0.0× / 0.4
Restricted · South Atlantic Ocean	0	19.1	0	—	— / 0

Cite: seahazards.com Sea Ledger, 2012-12, 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.