Sea Ledger, July 2011

2011-07-01 to 2011-07-31 · archive

issued: 356
warning-days in force: 6,226
in force at month end: 172
sea × type cells: 185

baseline: same month, previous 5 years (2010-07, 2009-07, 2008-07, 2007-07, 2006-07)

By type

type	issued	warning-days	in force at end
Exercises	64	785.2	15
Quakes	61	176.4	6
Incidents	50	471.9	12
Nav aids	41	1,119.3	33
Cable ops	34	971.1	30
Missiles	30	286.8	9
Derelicts	29	74.2	1
Surveys	15	1,080	31
Piracy	12	83.1	0
Containers	7	20.2	0
Other	6	359.6	11
Debris	2	6	0
Restricted	2	31.7	2
Structures	1	26.9	1
Spills	1	35	0
Wrecks	1	506.7	15
Ordnance	0	36.5	1
War risk	0	124	4
Volcanic	0	31	1

By sea and type · 185 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Quakes · South Pacific Oceansurge	26	80.3	2	32	2.7× / 9.6
Incidents · North Pacific Ocean	18	144.4	3	54	2.0× / 9.2
Quakes · North Pacific Oceansurge	16	43.8	2	33	2.6× / 6.2
Cable ops · South Atlantic Oceanlong running	13	155.4	3	995	0.5× / 25.4
Exercises · North Pacific Ocean	12	74.2	0	—	0.9× / 14
Missiles · North Pacific Ocean	10	69.2	2	63	1.7× / 6
Derelicts · North Pacific Oceansurge	10	27.6	0	—	10× / 1
Missiles · North Atlantic Oceansurge	9	103.3	4	35	23× / 0.4
Nav aids · North Sea	8	68.6	0	—	1.3× / 6.2
Exercises · Arabian Seasurge	8	63.1	2	63	5.0× / 1.6
Nav aids · Gulf of Mexicosurge	7	67.2	2	120	3.5× / 2
Exercises · South Pacific Ocean	7	46.6	1	32	1.8× / 4
Containers · North Pacific Oceannew	7	20.2	0	—	new / 0
Exercises · South Atlantic Ocean	6	45.9	1	31	1.0× / 6
Piracy · Red Seasurge	6	40.1	0	—	7.5× / 0.8
Derelicts · Arafura Seasurge	6	10.1	0	—	7.5× / 0.8
Nav aids · South Atlantic Oceanlong running	5	305.6	10	1,075	1.9× / 2.6
Exercises · Yellow Sea	5	52.3	1	39	1.0× / 5
Exercises · Bay of Bengal	5	44.4	0	—	1.2× / 4.2
Exercises · South China Seasurge	4	139.6	3	45	2.9× / 1.4
Cable ops · North Atlantic Ocean	4	112.9	4	33	0.9× / 4.6
Cable ops · North Seasurge	4	59.8	2	73	3.3× / 1.2
Cable ops · Norwegian Seasurge	4	59.7	3	49	6.7× / 0.6
Exercises · Laccadive Sea	4	33.3	1	35	0.7× / 5.6
Incidents · Bismarck Seasurge	4	26.3	0	—	10× / 0.4
Incidents · South China Seasurge	4	19.3	1	42	4.0× / 1
Incidents · South Atlantic Ocean	4	11.2	2	55	0.7× / 5.6
Nav aids · Gulf of Alaska	4	10.4	1	21	1.3× / 3
Derelicts · Coral Seasurge	4	8.9	1	30	5.0× / 0.8
Surveys · South Atlantic Ocean	3	100.2	2	67	1.3× / 2.4
Nav aids · North Atlantic Oceanlong running	3	87.5	4	425	0.8× / 3.8
Exercises · Philippine Seasurge	3	87.3	1	41	2.1× / 1.4
Nav aids · South Pacific Ocean	3	83.7	3	157	1.1× / 2.6
Incidents · South Pacific Ocean	3	35.7	2	36	0.3× / 8.8
Missiles · Arctic Oceannew	3	25.2	0	—	new / 0
Piracy · Gulf of Adensurge	3	18.7	0	—	15× / 0.2
Incidents · Indian Ocean	3	17	0	—	1.3× / 2.4
Quakes · Banda Seasurge	3	9	0	—	3.8× / 0.8
Derelicts · South Pacific Oceansurge	3	6.6	0	—	5.0× / 0.6
Incidents · Coral Sea	3	0.9	0	—	1.4× / 2.2
Nav aids · North Pacific Ocean	2	114	3	216	1.7× / 1.2
Surveys · Sea of Okhotsk	2	54.4	1	35	1.4× / 1.4
Surveys · North Pacific Ocean	2	40.6	1	30	5.0× / 0.4
Surveys · Barentsz Seanew	2	17.5	1	13	new / 0
Nav aids · Celtic Sea	2	16.6	0	—	1.4× / 1.4
Missiles · Barentsz Seanew	2	16.1	0	—	new / 0
Piracy · Arabian Seanew	2	14.4	0	—	new / 0
Missiles · South Atlantic Ocean	2	12.1	1	8	2.5× / 0.8
Incidents · Solomon Sea	2	10.1	0	—	10× / 0.2
Cable ops · Mediterranean Sea - Eastern Basin	2	9.2	1	9	0.7× / 3
Derelicts · Gulf of Adennew	2	6	0	—	new / 0
Quakes · Gulf of Alaska	2	6	0	—	10× / 0.2
Quakes · North Atlantic Ocean	2	6	0	—	3.3× / 0.6
Quakes · Southern Ocean	2	6	0	—	3.3× / 0.6
Nav aids · Inner Seas off the West Coast of Scotland	2	4.3	0	—	0.5× / 4
Derelicts · Philippine Sea	2	3.6	0	—	5.0× / 0.4
Quakes · Bismarck Sea	2	3	1	6	1.3× / 1.6
Restricted · North Seanew	2	0.7	1	2	new / 0
Cable ops · Persian Gulf	1	105.7	4	200	1.7× / 0.6
Cable ops · South China Sea	1	104	3	120	0.5× / 2
Surveys · Baffin Baylong running	1	74.7	3	394	1.0× / 1
Other · North Pacific Ocean	1	64.5	2	55	1.3× / 0.8
Surveys · Chukchi Sea	1	59.7	2	322	new / 0
Surveys · North Atlantic Ocean	1	49.2	0	—	0.4× / 2.6
Other · The Northwestern Passageslong running	1	42.9	1	365	5.0× / 0.2
Incidents · Philippine Sea	1	41.3	0	—	0.2× / 4.4
Surveys · Bering Sea	1	40	1	351	new / 0
Nav aids · Caribbean Sea	1	37.2	2	68	new / 0
Nav aids · Coral Sea	1	31.6	1	37	0.5× / 2
Incidents · Tyrrhenian Sea	1	29.3	1	29	0.8× / 1.2
Wrecks · English Channel	1	26.3	1	26	1.3× / 0.8
Other · Arctic Oceanlong running	1	25.5	1	392	5.0× / 0.2
Surveys · Black Sea	1	25.5	1	56	1.7× / 0.6
Cable ops · Singapore Strait	1	20.6	0	—	2.5× / 0.4
Cable ops · Sea of Okhotsk	1	20.4	1	20	0.6× / 1.6
Cable ops · Red Sea	1	16	0	—	new / 0
Cable ops · Java Sea	1	15.7	0	—	5.0× / 0.2
Spills · Gulf of Alaska	1	14	0	—	2.5× / 0.4
Surveys · Mediterranean Sea - Eastern Basin	1	13.5	1	13	0.7× / 1.4
Incidents · Arabian Sea	1	12	0	—	1.3× / 0.8
Structures · North Sea	1	11.5	1	173	new / 0
Piracy · Indian Ocean	1	9.9	0	—	5.0× / 0.2
Exercises · North Atlantic Ocean	1	8.2	0	—	0.3× / 4
Exercises · Japan Sea	1	7	0	—	0.2× / 6.2
Incidents · Davis Strait	1	6.3	0	—	new / 0
Exercises · Eastern China Sea	1	5.2	0	—	new / 0
Missiles · South Pacific Ocean	1	5.2	0	—	5.0× / 0.2
Exercises · Andaman or Burma Sea	1	5	0	—	1.7× / 0.6
Missiles · Bay of Bengal	1	5	0	—	1.7× / 0.6
Exercises · Indian Ocean	1	5	0	—	1.7× / 0.6
Missiles · Japan Sea	1	5	1	36	new / 0
Missiles · Laccadive Sea	1	4.9	0	—	5.0× / 0.2
Incidents · Gulf of Aden	1	4.8	1	4	new / 0
Exercises · Gulf of Alaska	1	4.3	0	—	5.0× / 0.2
Exercises · Black Sea	1	4	0	—	1.0× / 1
Other · Yellow Sea	1	3.8	1	3	5.0× / 0.2
Incidents · Mozambique Channel	1	3.7	0	—	5.0× / 0.2
Cable ops · Gulf of Thailand	1	3.4	1	3	5.0× / 0.2
Other · South Pacific Ocean	1	3.3	0	—	1.7× / 0.6
Quakes · Gulf of Boni	1	3	0	—	new / 0
Quakes · Gulf of California	1	3	0	—	2.5× / 0.4
Debris · Indian Ocean	1	3	0	—	1.7× / 0.6
Derelicts · Indian Ocean	1	3	0	—	0.7× / 1.4
Quakes · Indian Ocean	1	3	0	—	0.2× / 4.8
Debris · Mediterranean Sea - Eastern Basin	1	3	0	—	new / 0
Derelicts · North Atlantic Ocean	1	3	0	—	0.6× / 1.6
Quakes · Sea of Okhotsk	1	3	0	—	1.7× / 0.6
Quakes · Solomon Sea	1	3	0	—	0.6× / 1.8
Quakes · South China Sea	1	3	0	—	2.5× / 0.4
Quakes · Sulu Sea	1	3	0	—	new / 0
Incidents · Malacca Strait	1	2.3	1	2	new / 0
Other · Davis Strait	1	2.2	0	—	new / 0
Exercises · Bering Sea	1	2.1	0	—	5.0× / 0.2
Exercises · Coral Sea	1	1.4	0	—	new / 0
Exercises · Baltic Sea	1	1.3	0	—	0.6× / 1.6
Quakes · Philippine Sea	1	1.3	1	1	0.7× / 1.4
Incidents · Laccadive Sea	1	0.8	1	0	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	0.4	0	—	0.6× / 1.6
Incidents · Arafura Sea	1	0.3	0	—	5.0× / 0.2
Nav aids · Davis Strait	1	0.3	0	—	new / 0
Nav aids · Timor Sea	1	0.1	0	—	2.5× / 0.4
Surveys · Arctic Oceanlong running	0	286.8	9	1,744	0.0× / 1.6
Exercises · Aegean Sea	0	155	5	213	0.0× / 0.2
Wrecks · Arabian Sealong running	0	124	4	592	0.0× / 0.6
Surveys · Beaufort Sealong running	0	124	4	394	0.0× / 3.2
War risk · Mediterranean Sea - Eastern Basin	0	124	4	67	— / 0
Nav aids · Arabian Sea	0	93	3	359	0.0× / 0.2
Wrecks · South China Sea	0	93	3	313	0.0× / 0.4
Wrecks · The Northwestern Passageslong running	0	93	3	394	0.0× / 0.6
Nav aids · English Channel	0	69.8	1	173	0.0× / 1.4
Cable ops · Gulf of Mexico	0	62	2	68	0.0× / 1.4
Other · North Sea	0	48.5	1	146	0.0× / 0.4
Wrecks · Persian Gulf	0	42.5	1	219	0.0× / 0.6
Wrecks · North Sea	0	34.9	0	—	0.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basin	0	34.6	1	285	0.0× / 0.2
Nav aids · Irish Sea and St. George's Channel	0	32.4	1	155	0.0× / 2.8
Incidents · Gulf of Mexico	0	32.1	0	—	0.0× / 0.6
Incidents · North Atlantic Ocean	0	32.1	0	—	0.0× / 6.6
Missiles · Aegean Sea	0	31	1	213	— / 0
Cable ops · Barentsz Sea	0	31	1	61	— / 0
Other · Bay of Bengal	0	31	1	97	— / 0
Cable ops · Caribbean Sea	0	31	1	352	— / 0
Cable ops · Celtic Sea	0	31	1	46	0.0× / 2
Surveys · Davis Strait	0	31	1	72	— / 0
Surveys · Indian Ocean	0	31	1	181	0.0× / 0.6
Wrecks · Laccadive Sea	0	31	1	121	0.0× / 0.4
Other · Mediterranean Sea - Eastern Basin	0	31	1	114	0.0× / 0.8
Cable ops · Mediterranean Sea - Western Basin	0	31	1	32	0.0× / 0.4
Surveys · Mozambique Channel	0	31	1	38	0.0× / 0.2
Ordnance · North Sealong running	0	31	1	1,003	0.0× / 0.2
Surveys · North Sea	0	31	1	131	0.0× / 1.4
Restricted · Persian Gulf	0	31	1	241	— / 0
Surveys · Persian Gulf	0	31	1	81	— / 0
Volcanic · Philippine Sealong running	0	31	1	520	0.0× / 0.4
Nav aids · Red Sea	0	31	1	195	— / 0
Cable ops · Sea of Marmara	0	31	1	32	0.0× / 0.6
Other · Sea of Okhotsk	0	31	1	44	0.0× / 0.2
Other · South Atlantic Ocean	0	31	1	80	0.0× / 1.2
Wrecks · South Atlantic Oceanlong running	0	31	1	445	— / 0
Other · South China Sealong running	0	31	1	1,110	0.0× / 0.4
Cable ops · South Pacific Ocean	0	31	1	68	— / 0
Wrecks · South Pacific Ocean	0	31	1	149	0.0× / 0.2
Surveys · Sea of Azov	0	27	0	—	— / 0
Cable ops · Tasman Sea	0	23.9	0	—	0.0× / 0.6
Nav aids · Andaman or Burma Sea	0	17.5	0	—	— / 0
Incidents · Caribbean Sea	0	15.4	0	—	0.0× / 1
Structures · Indian Ocean	0	15.4	0	—	— / 0
Cable ops · Black Sea	0	15	0	—	0.0× / 0.6
Nav aids · Laccadive Sea	0	13.5	0	—	0.0× / 0.2
Other · Persian Gulf	0	12.5	0	—	0.0× / 0.2
Spills · North Pacific Ocean	0	12	0	—	0.0× / 2.4
Missiles · Arabian Sea	0	9.8	0	—	— / 0
Incidents · Bering Sea	0	9.8	0	—	0.0× / 0.2
Spills · Bering Sea	0	9	0	—	0.0× / 0.4
Incidents · Andaman or Burma Sea	0	8.4	0	—	— / 0
Incidents · Singapore Strait	0	8.4	0	—	— / 0
Surveys · Bay of Bengal	0	8	0	—	0.0× / 0.4
Ordnance · Black Sea	0	5.5	0	—	0.0× / 0.2
Derelicts · Arabian Sea	0	4.9	0	—	— / 0
Surveys · Laptev Sea	0	3.9	0	—	— / 0
Other · North Atlantic Ocean	0	1.4	0	—	0.0× / 1
Cable ops · North Pacific Ocean	0	1.4	0	—	— / 0
Derelicts · South Atlantic Ocean	0	0.5	0	—	0.0× / 1
Cable ops · Eastern China Sea	0	0	0	—	0.0× / 0.2
Ordnance · Ionian Sea	0	0	0	—	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2011-07, 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.