Sea Ledger, April 2010

2010-04-01 to 2010-04-30 · archive

issued: 397
warning-days in force: 7,579
in force at month end: 260
sea × type cells: 170

baseline: same month, previous 5 years (2009-04, 2008-04, 2007-04, 2006-04, 2005-04)

By type

type	issued	warning-days	in force at end
Exercises	75	646.3	15
Cable ops	71	1,272.6	44
Nav aids	63	1,229.4	41
Incidents	44	669.7	27
Piracy	40	475.8	16
Quakes	32	90.8	3
Missiles	21	198	6
Spills	13	124.4	6
Surveys	9	2,005.3	70
Other	9	183.9	8
Debris	7	49.8	1
Ordnance	6	207	8
Derelicts	3	15.7	0
Wrecks	2	341.4	12
Structures	2	37	2
Containers	0	1.5	0
Volcanic	0	30	1

By sea and type · 170 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Cable ops · South Atlantic Oceanlong running	31	294.6	9	538	1.3× / 24.2
Incidents · North Pacific Oceansurge	23	356.5	15	65	2.6× / 8.8
Exercises · North Pacific Ocean	18	75	1	34	1.6× / 11
Piracy · Arabian Seanew	15	148.9	4	39	new / 0
Piracy · Indian Oceansurge	14	171.4	6	53	23× / 0.6
Quakes · South Pacific Ocean	12	36	0	—	1.1× / 10.4
Missiles · North Pacific Oceansurge	10	75.6	2	33	2.1× / 4.8
Exercises · Japan Seasurge	10	61.8	2	37	2.8× / 3.6
Nav aids · The Coastal Waters of Southeast Alaska and British Columbiasurge	10	4.9	0	—	25× / 0.4
Spills · Gulf of Mexicosurge	9	76.4	4	28	2.5× / 3.6
Nav aids · South Atlantic Oceansurgelong running	7	308.2	10	618	2.3× / 3
Incidents · North Atlantic Oceansurge	7	53.7	3	74	2.1× / 3.4
Exercises · Yellow Sea	7	52.3	1	37	1.9× / 3.6
Cable ops · Gulf of Guineasurge	7	46.1	2	29	35× / 0.2
Nav aids · English Channelsurge	6	79.4	4	267	2.7× / 2.2
Exercises · Philippine Seasurge	6	57	1	34	3.3× / 1.8
Piracy · South China Seasurge	6	47.9	2	37	10× / 0.6
Nav aids · Gulf of Mexicosurge	6	12.2	1	28	3.0× / 2
Nav aids · North Sealong running	5	207.7	6	414	1.3× / 3.8
Missiles · North Atlantic Oceannew	5	97.7	3	42	new / 0
Cable ops · Arabian Sea	5	65	4	41	1.8× / 2.8
Exercises · North Atlantic Ocean	5	48.5	1	32	0.8× / 6.2
Debris · North Pacific Oceansurge	5	13.8	0	—	25× / 0.2
Nav aids · Gulf of Alaskasurge	5	2.5	0	—	13× / 0.4
Nav aids · North Atlantic Oceanlong running	4	80.8	3	426	1.8× / 2.2
Exercises · Arabian Sea	4	46.9	0	—	1.7× / 2.4
Incidents · South Atlantic Ocean	4	42.2	0	—	0.9× / 4.4
Exercises · Laccadive Sea	4	31.3	0	—	0.6× / 6.4
Exercises · Bay of Bengal	4	27.6	1	35	0.8× / 5
Exercises · South China Seasurge	3	58.5	2	34	2.5× / 1.2
Incidents · Caribbean Seasurge	3	51.6	2	28	15× / 0.2
Cable ops · Gulf of Suezsurge	3	43.5	0	—	2.5× / 1.2
Nav aids · Celtic Seasurge	3	34.4	1	151	2.1× / 1.4
Surveys · Mediterranean Sea - Eastern Basin	3	25.6	3	23	1.9× / 1.6
Exercises · South Atlantic Ocean	3	23.9	1	27	0.6× / 5.4
Derelicts · North Pacific Oceansurge	3	15.7	0	—	2.5× / 1.2
Cable ops · Mozambique Channelnew	3	15.3	0	—	new / 0
Quakes · North Pacific Ocean	3	9	0	—	0.7× / 4.4
Nav aids · Inner Seas off the West Coast of Scotland	3	7.7	0	—	0.9× / 3.2
Quakes · Indian Ocean	3	7	1	24	0.4× / 8.2
Cable ops · Gulf of Mexico	2	168	6	182	2.0× / 1
Nav aids · Irish Sea and St. George's Channellong running	2	137.3	4	558	1.0× / 2
Cable ops · Mediterranean Sea - Eastern Basin	2	118.5	3	57	0.8× / 2.6
Nav aids · South Pacific Ocean	2	104.4	4	106	1.7× / 1.2
Incidents · South Pacific Ocean	2	80.2	3	56	0.3× / 6.6
Cable ops · Bay of Bengal	2	73.5	3	62	0.6× / 3.4
Cable ops · Tasman Sea	2	58.9	3	59	5.0× / 0.4
Piracy · Gulf of Aden	2	44.2	1	35	10× / 0.2
Exercises · Baltic Sea	2	29.1	0	—	1.3× / 1.6
Cable ops · Indian Ocean	2	28.2	1	57	10× / 0.2
Spills · North Pacific Ocean	2	25	1	29	1.4× / 1.4
Cable ops · North Atlantic Ocean	2	22.7	2	32	0.6× / 3.6
Missiles · South Atlantic Oceannew	2	10.8	1	7	new / 0
Ordnance · North Pacific Oceannew	2	10.1	1	26	new / 0
Exercises · Bering Sea	2	6.1	0	—	2.0× / 1
Quakes · Gulf of Californianew	2	6	0	—	new / 0
Debris · North Atlantic Oceannew	2	6	0	—	new / 0
Quakes · Solomon Sea	2	6	0	—	0.3× / 7.2
Quakes · South Atlantic Ocean	2	6	0	—	1.4× / 1.4
Cable ops · North Sea	2	4.3	0	—	1.3× / 1.6
Exercises · Mediterranean Sea - Western Basin	2	2.9	0	—	5.0× / 0.4
Other · North Pacific Ocean	2	1.8	0	—	2.5× / 0.8
Nav aids · North Pacific Ocean	2	0.6	0	—	1.4× / 1.4
Quakes · Bering Sea	2	0.1	2	0	1.4× / 1.4
Cable ops · South China Sea	1	102.8	3	86	0.6× / 1.8
Ordnance · Gulf of Adenlong running	1	90	3	410	new / 0
Cable ops · South Pacific Ocean	1	74.1	2	115	0.7× / 1.4
Nav aids · Coral Sealong running	1	63	2	787	0.4× / 2.6
Surveys · North Pacific Ocean	1	56.3	2	114	5.0× / 0.2
Incidents · Gulf of Mexico	1	41.9	1	47	new / 0
Cable ops · Mediterranean Sea - Western Basin	1	39	1	87	1.0× / 1
Nav aids · Arabian Sea	1	36.2	1	135	0.8× / 1.2
Surveys · Arabian Sea	1	35	1	41	1.7× / 0.6
Other · South China Sealong running	1	34.6	2	653	5.0× / 0.2
Wrecks · Inner Seas off the West Coast of Scotland	1	31.2	2	196	new / 0
Ordnance · North Sealong running	1	30.7	1	546	0.7× / 1.4
Nav aids · Tasman Sea	1	28.5	1	43	1.7× / 0.6
Structures · South China Sea	1	25.7	1	25	new / 0
Cable ops · Laccadive Sea	1	25.6	0	—	1.7× / 0.6
Cable ops · Yellow Sea	1	23.6	1	111	5.0× / 0.2
Cable ops · Andaman or Burma Sea	1	22.4	1	22	2.5× / 0.4
Wrecks · North Sea	1	21.4	1	21	new / 0
Exercises · Gulf of California	1	15.6	0	—	new / 0
Other · Irish Sea and St. George's Channel	1	15.4	1	15	5.0× / 0.2
Surveys · Gulf of Mexico	1	14.4	1	14	new / 0
Spills · Coral Sea	1	13	0	—	new / 0
Cable ops · Eastern China Sea	1	12.6	1	35	2.5× / 0.4
Piracy · Celebes Sea	1	12.3	0	—	new / 0
Piracy · Malacca Strait	1	11.8	1	11	5.0× / 0.2
Ordnance · Arabian Sea	1	11.7	0	—	new / 0
Structures · North Sea	1	11.3	1	11	5.0× / 0.2
Nav aids · Mozambique Channel	1	10.5	1	10	1.3× / 0.8
Other · Caribbean Sea	1	10.2	1	10	5.0× / 0.2
Spills · North Atlantic Ocean	1	10	1	10	0.4× / 2.6
Piracy · Java Sea	1	9.3	1	9	5.0× / 0.2
Surveys · Mozambique Channel	1	9.2	1	9	1.0× / 1
Surveys · Laccadive Sea	1	9	1	8	new / 0
Exercises · Black Sea	1	7.5	1	7	0.4× / 2.6
Incidents · Adriatic Sea	1	6.8	1	6	2.5× / 0.4
Missiles · Japan Sea	1	5.9	0	—	new / 0
Other · North Sea	1	5.8	0	—	0.6× / 1.8
Missiles · South Pacific Ocean	1	5.4	0	—	new / 0
Ordnance · Ionian Sea	1	4.5	1	4	new / 0
Incidents · Laccadive Sea	1	4.4	1	4	5.0× / 0.2
Exercises · Coral Sea	1	4	0	—	new / 0
Cable ops · Celtic Sea	1	3.9	1	3	0.5× / 2.2
Incidents · Tyrrhenian Sea	1	3.7	1	3	1.3× / 0.8
Surveys · Celtic Sea	1	3.3	0	—	1.3× / 0.8
Exercises · Andaman or Burma Sea	1	3.1	0	—	1.7× / 0.6
Quakes · Alboran Sea	1	3	0	—	new / 0
Quakes · Ceram Sea	1	3	0	—	5.0× / 0.2
Quakes · Coral Sea	1	3	0	—	0.2× / 4.6
Other · Gulf of Mexico	1	3	0	—	new / 0
Quakes · Molukka Sea	1	3	0	—	1.0× / 1
Quakes · Philippine Sea	1	3	0	—	0.3× / 3.4
Quakes · Southern Ocean	1	3	0	—	1.0× / 1
Other · Inner Seas off the West Coast of Scotland	1	1.8	0	—	2.5× / 0.4
Nav aids · South China Sea	1	1.8	0	—	new / 0
Other · Celtic Sea	1	1.5	1	1	1.7× / 0.6
Missiles · Indian Ocean	1	1.5	0	—	new / 0
Nav aids · Indian Ocean	1	1.4	0	—	0.6× / 1.6
Nav aids · Great Australian Bight	1	1.2	0	—	0.7× / 1.4
Missiles · Bay of Bengal	1	1.1	0	—	new / 0
Exercises · Adriatic Sea	1	0.6	1	0	5.0× / 0.2
Incidents · Davis Strait	1	0.5	0	—	new / 0
Nav aids · Bay of Bengal	1	0.3	0	—	2.5× / 0.4
Surveys · Beaufort Sealong running	0	690	23	2,304	— / 0
Surveys · Arctic Oceanlong running	0	450	15	2,304	0.0× / 0.2
Surveys · Baffin Baylong running	0	150	5	2,402	— / 0
Surveys · The Northwestern Passageslong running	0	150	5	1,287	— / 0
Exercises · Aegean Sea	0	90	3	121	0.0× / 2.6
Surveys · Laptev Sealong running	0	90	3	1,438	— / 0
Wrecks · The Northwestern Passageslong running	0	90	3	601	— / 0
Wrecks · South China Sealong running	0	69.4	2	1,010	— / 0
Nav aids · Malacca Strait	0	60	2	38	— / 0
Wrecks · North Atlantic Oceanlong running	0	60	2	703	— / 0
Surveys · South Atlantic Ocean	0	60	2	295	0.0× / 1.4
Surveys · Irish Sea and St. George's Channel	0	43.5	1	172	0.0× / 0.2
Other · Mediterranean Sea - Eastern Basin	0	40.4	1	249	0.0× / 1.2
Wrecks · Arabian Sea	0	30	1	135	0.0× / 0.4
Debris · Arctic Oceanlong running	0	30	1	1,956	— / 0
Other · Arctic Oceanlong running	0	30	1	969	— / 0
Surveys · Bering Sealong running	0	30	1	561	0.0× / 0.2
Wrecks · Celtic Sea	0	30	1	80	— / 0
Cable ops · Ceram Sea	0	30	1	149	— / 0
Surveys · Chukchi Sealong running	0	30	1	1,837	0.0× / 0.2
Other · Coral Sealong running	0	30	1	526	0.0× / 0.2
Ordnance · English Channel	0	30	1	45	0.0× / 0.4
Surveys · Greenland Sealong running	0	30	1	2,620	— / 0
Surveys · Gulf of Guinea	0	30	1	118	0.0× / 0.2
Nav aids · Gulf of Suezlong running	0	30	1	483	0.0× / 0.8
Surveys · Malacca Straitlong running	0	30	1	633	— / 0
Ordnance · Mediterranean Sea - Eastern Basin	0	30	1	61	— / 0
Surveys · North Sea	0	30	1	58	0.0× / 0.6
Piracy · Persian Gulflong running	0	30	1	842	— / 0
Volcanic · Philippine Sea	0	30	1	63	0.0× / 0.8
Surveys · Tasman Sea	0	30	1	156	0.0× / 0.6
Incidents · Arabian Sea	0	16.4	0	—	0.0× / 1.2
Nav aids · Sea of Okhotsk	0	16.4	0	—	— / 0
Other · Adriatic Sea	0	9.4	0	—	— / 0
Wrecks · Persian Gulf	0	9.4	0	—	— / 0
Incidents · Philippine Sea	0	9.4	0	—	0.0× / 8.2
Surveys · Philippine Sea	0	5	0	—	0.0× / 0.4
Exercises · South Pacific Ocean	0	4.6	0	—	0.0× / 4.4
Surveys · Sea of Marmara	0	4	0	—	0.0× / 0.4
Incidents · Coral Sea	0	2.4	0	—	0.0× / 3.8
Quakes · Bay of Bengal	0	1.7	0	—	0.0× / 0.4
Containers · North Atlantic Ocean	0	1.5	0	—	0.0× / 0.8
Quakes · Japan Sea	0	1	0	—	0.0× / 0.4
Spills · Philippine Sea	0	0	0	—	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2010-04, 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.