Sea Ledger, April 2007

2007-04-01 to 2007-04-30 · archive

issued: 403
warning-days in force: 13,999
in force at month end: 482
sea × type cells: 237

baseline: same month, previous 5 years (2006-04, 2005-04, 2004-04, 2003-04, 2002-04)

By type

type	issued	warning-days	in force at end
Quakes	80	280.1	6
Cable ops	77	1,316.7	50
Exercises	70	820.6	27
Incidents	55	1,308.6	52
Nav aids	30	4,777.2	157
Surveys	21	2,105.6	72
Derelicts	18	151	6
Icebergs	16	97.3	1
Other	8	853.7	29
Spills	8	102	5
Missiles	6	60	2
Volcanic	4	178.9	6
Ordnance	3	124	5
Structures	2	175.8	7
Containers	2	10.4	1
Restricted	1	247.1	8
Debris	1	37.5	2
Mines	1	2	1
Wrecks	0	1,290	43
Towing	0	30	1
Piracy	0	30	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Quakes · Solomon Seasurge	35	103.8	1	29	175× / 0.2
Cable ops · South Atlantic Ocean	33	175.7	6	34	1.3× / 26.4
Incidents · North Pacific Ocean	12	256.4	13	47	1.4× / 8.4
Exercises · North Pacific Ocean	12	90.5	2	32	1.4× / 8.8
Icebergs · North Atlantic Oceansurge	12	70.9	0	—	5.5× / 2.2
Incidents · Philippine Seasurge	11	253.9	12	50	2.0× / 5.4
Quakes · South Pacific Ocean	9	32.5	0	—	0.7× / 13
Exercises · North Atlantic Ocean	8	78.4	4	59	0.7× / 10.8
Exercises · Laccadive Sea	8	55.9	3	32	0.9× / 8.4
Cable ops · North Atlantic Oceansurge	8	46.7	1	30	2.4× / 3.4
Cable ops · Celtic Seasurge	7	100.6	2	83	5.0× / 1.4
Incidents · South Pacific Ocean	6	172.5	6	58	0.8× / 7.4
Incidents · Coral Sea	6	78.4	3	70	1.9× / 3.2
Missiles · North Pacific Ocean	6	60	2	56	1.2× / 5
Exercises · Black Sea	6	51.9	3	26	1.0× / 5.8
Exercises · Bay of Bengal	6	19.2	0	—	1.0× / 6
Quakes · Eastern China Seanew	6	18	0	—	new / 0
Quakes · North Pacific Ocean	6	18	0	—	1.3× / 4.8
Spills · North Atlantic Oceansurge	5	49	3	36	3.1× / 1.6
Exercises · South Pacific Ocean	5	45.3	2	17	1.3× / 4
Exercises · South Atlantic Ocean	5	32.2	0	—	1.7× / 3
Quakes · Coral Sea	5	17.9	0	—	1.6× / 3.2
Nav aids · Indian Oceansurge	4	271.2	11	350	6.7× / 0.6
Surveys · Mediterranean Sea - Eastern Basinsurge	4	104.7	5	136	3.3× / 1.2
Incidents · North Atlantic Ocean	4	86.9	4	179	0.9× / 4.6
Incidents · Indian Ocean	4	77.7	2	63	1.1× / 3.8
Derelicts · South Atlantic Oceansurge	4	32.9	1	25	3.3× / 1.2
Icebergs · South Atlantic Ocean	4	26.4	1	29	1.1× / 3.6
Derelicts · North Pacific Oceansurge	4	18.6	0	—	5.0× / 0.8
Exercises · Baltic Seanew	4	15.5	0	—	new / 0
Quakes · Indian Ocean	4	12	0	—	0.6× / 7.2
Nav aids · English Channelsurgelong running	3	93.2	3	561	2.5× / 1.2
Nav aids · Inner Seas off the West Coast of Scotland	3	91.7	4	326	0.8× / 3.6
Nav aids · Great Australian Bightsurge	3	87.7	3	312	7.5× / 0.4
Exercises · Japan Sea	3	76.1	2	35	1.3× / 2.4
Cable ops · Mediterranean Sea - Eastern Basin	3	65.6	3	104	0.9× / 3.4
Cable ops · Arabian Sea	3	60	2	87	1.1× / 2.8
Volcanic · Philippine Seasurge	3	60	2	208	7.5× / 0.4
Surveys · North Atlantic Oceanlong running	3	58.4	2	390	1.1× / 2.8
Cable ops · South Pacific Oceansurge	3	39.6	2	51	7.5× / 0.4
Surveys · South Atlantic Ocean	3	33.6	2	36	0.7× / 4.2
Cable ops · North Sea	3	27.5	2	19	1.7× / 1.8
Cable ops · Persian Gulfsurge	3	18.8	2	10	5.0× / 0.6
Incidents · Tasman Sea	3	18.2	0	—	1.4× / 2.2
Nav aids · Celtic Seasurge	3	11.6	1	49	2.5× / 1.2
Incidents · South Atlantic Ocean	3	10.5	1	46	0.6× / 5
Incidents · Tyrrhenian Seasurge	3	10.4	2	23	15× / 0.2
Quakes · Philippine Sea	3	9	0	—	1.9× / 1.6
Quakes · Southern Oceansurge	3	8.4	1	18	5.0× / 0.6
Surveys · Bay of Biscaysurge	3	5.8	0	—	15× / 0.2
Nav aids · Arabian Sealong running	2	450.6	16	476	1.4× / 1.4
Nav aids · Mozambique Channellong running	2	197.7	7	748	2.5× / 0.8
Cable ops · Bay of Bengal	2	171.2	6	154	1.3× / 1.6
Cable ops · South China Sea	2	69	3	50	1.7× / 1.2
Exercises · Yellow Sea	2	64.9	2	35	1.7× / 1.2
Surveys · Sea of Marmaranew	2	52.1	1	325	new / 0
Other · Mediterranean Sea - Eastern Basin	2	48.6	1	39	10× / 0.2
Quakes · Bay of Bengalnew	2	39.5	2	140	new / 0
Incidents · Japan Sea	2	24.7	2	16	5.0× / 0.4
Derelicts · North Atlantic Ocean	2	15.6	1	70	2.5× / 0.8
Exercises · Mediterranean Sea - Eastern Basin	2	15.3	0	—	0.6× / 3.6
Cable ops · Sea of Marmaranew	2	14.9	1	28	new / 0
Exercises · North Seanew	2	8.4	0	—	new / 0
Exercises · Arabian Sea	2	7.2	1	6	0.5× / 4.4
Derelicts · Indian Ocean	2	6.9	1	11	3.3× / 0.6
Quakes · Molukka Sea	2	6	0	—	2.5× / 0.8
Quakes · North Atlantic Ocean	2	6	0	—	3.3× / 0.6
Exercises · Philippine Sea	2	2.1	0	—	5.0× / 0.4
Nav aids · South Pacific Oceanlong running	1	679.7	19	480	0.6× / 1.6
Nav aids · Coral Sealong running	1	330.1	11	1,030	0.4× / 2.8
Nav aids · Caribbean Sealong running	1	304.9	9	686	5.0× / 0.2
Nav aids · Laccadive Sealong running	1	187.2	6	479	1.7× / 0.6
Nav aids · North Atlantic Oceanlong running	1	98.5	2	468	0.4× / 2.4
Nav aids · Arafura Sea	1	91.9	4	266	2.5× / 0.4
Nav aids · South Atlantic Ocean	1	89.7	3	177	0.4× / 2.8
Nav aids · Gulf of Suez	1	68.2	3	137	1.0× / 1
Other · South Atlantic Ocean	1	66.3	2	212	1.0× / 1
Nav aids · Tasman Sealong running	1	61	2	443	1.3× / 0.8
Nav aids · Irish Sea and St. George's Channellong running	1	60.2	2	417	0.7× / 1.4
Surveys · Gulf of Suez	1	42.4	2	286	new / 0
Surveys · Bay of Bengal	1	41.1	1	32	1.0× / 1
Other · Indian Oceanlong running	1	41	2	403	5.0× / 0.2
Other · Black Sea	1	39.6	2	142	2.5× / 0.4
Spills · Gulf of Mexico	1	36	0	—	0.3× / 3.4
Surveys · North Sea	1	34.6	1	357	1.7× / 0.6
Ordnance · North Sea	1	33.6	2	31	1.3× / 0.8
Incidents · Arabian Sea	1	31.7	1	73	2.5× / 0.4
Other · Coral Sea	1	30.5	1	50	new / 0
Volcanic · Banda Sea	1	28.9	1	28	new / 0
Other · Gulf of Guinea	1	27.6	1	27	new / 0
Cable ops · Caribbean Sea	1	25.5	1	25	2.5× / 0.4
Ordnance · English Channel	1	25.4	1	25	5.0× / 0.2
Cable ops · Laccadive Sea	1	25.1	1	25	2.5× / 0.4
Derelicts · Arabian Sea	1	18.6	1	18	new / 0
Cable ops · Arafura Sea	1	14.6	1	14	new / 0
Exercises · Persian Gulf	1	13.5	0	—	0.7× / 1.4
Structures · Gulf of Mexico	1	13.3	1	13	5.0× / 0.2
Structures · Gulf of Suez	1	12.5	1	12	new / 0
Spills · North Pacific Ocean	1	10	1	10	5.0× / 0.2
Surveys · Ionian Sea	1	9.8	1	9	5.0× / 0.2
Surveys · Philippine Sea	1	9.6	1	9	2.5× / 0.4
Cable ops · Norwegian Sea	1	9.2	1	9	new / 0
Restricted · North Atlantic Ocean	1	7.1	0	—	5.0× / 0.2
Spills · Caribbean Sea	1	7	1	7	2.5× / 0.4
Derelicts · South China Sea	1	6.8	0	—	new / 0
Derelicts · Arafura Sea	1	6.7	0	—	1.7× / 0.6
Derelicts · Tyrrhenian Sea	1	6.7	0	—	5.0× / 0.2
Cable ops · Gulf of Suez	1	6.3	0	—	1.7× / 0.6
Containers · North Pacific Ocean	1	5.5	1	5	5.0× / 0.2
Ordnance · Philippine Sea	1	5	0	—	5.0× / 0.2
Containers · North Atlantic Ocean	1	4.9	0	—	1.0× / 1
Cable ops · Sulu Sea	1	3.6	1	3	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.7× / 0.6
Derelicts · Celtic Sea	1	3	1	3	1.3× / 0.8
Exercises · Sulu Sea	1	2.9	0	—	new / 0
Debris · North Pacific Ocean	1	2.5	1	2	5.0× / 0.2
Mines · English Channel	1	2	1	1	new / 0
Quakes · Bering Sea	1	1.5	1	1	1.0× / 1
Exercises · Indian Ocean	1	1.3	0	—	1.7× / 0.6
Surveys · Inner Seas off the West Coast of Scotland	1	1.2	0	—	new / 0
Derelicts · Timor Sea	1	1.2	0	—	5.0× / 0.2
Cable ops · Gulf of Mexico	1	0.8	1	0	new / 0
Cable ops · Mediterranean Sea - Western Basin	1	0.6	1	0	1.0× / 1
Quakes · South Atlantic Ocean	1	0.3	1	0	2.5× / 0.4
Other · North Pacific Ocean	1	0.1	0	—	0.7× / 1.4
Surveys · Beaufort Sealong running	0	690	23	1,208	— / 0
Surveys · Arctic Oceanlong running	0	360	12	1,208	— / 0
Nav aids · North Sea	0	226.5	7	193	0.0× / 3.6
Nav aids · Bay of Bengallong running	0	210	7	686	0.0× / 0.4
Exercises · Aegean Sea	0	180	6	117	0.0× / 3
Wrecks · Mediterranean Sea - Eastern Basinlong running	0	180	6	1,036	— / 0
Wrecks · North Sealong running	0	180	6	580	— / 0
Wrecks · Persian Gulf	0	180	6	275	0.0× / 0.6
Surveys · Baffin Baylong running	0	150	5	1,306	— / 0
Nav aids · North Pacific Oceanlong running	0	150	5	649	0.0× / 0.2
Nav aids · Tyrrhenian Sealong running	0	150	5	893	0.0× / 2.4
Nav aids · Bering Sea	0	120	4	285	0.0× / 0.2
Cable ops · Black Sea	0	120	4	215	0.0× / 1
Cable ops · Indian Ocean	0	120	4	95	0.0× / 0.2
Nav aids · Mediterranean Sea - Western Basinlong running	0	120	4	374	0.0× / 1.8
Nav aids · Andaman or Burma Sealong running	0	93.8	2	544	— / 0
Incidents · Gulf of Guinea	0	90	3	192	0.0× / 0.4
Nav aids · Gulf of Mexicolong running	0	90	3	749	0.0× / 1.2
Surveys · Laptev Sea	0	90	3	342	— / 0
Structures · Mediterranean Sea - Eastern Basin	0	90	3	312	— / 0
Other · Persian Gulflong running	0	90	3	448	0.0× / 1.4
Other · South Pacific Ocean	0	90	3	308	0.0× / 0.8
Cable ops · Tasman Sealong running	0	90	3	456	0.0× / 0.8
Other · Arabian Sealong running	0	60	2	439	0.0× / 0.4
Nav aids · Bass Strait	0	60	2	224	0.0× / 0.6
Other · Bay of Bengal	0	60	2	182	— / 0
Wrecks · Bay of Bengal	0	60	2	332	— / 0
Wrecks · Coral Sealong running	0	60	2	460	0.0× / 0.2
Exercises · Ionian Sea	0	60	2	108	0.0× / 1.8
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	60	2	983	0.0× / 0.6
Nav aids · Persian Gulf	0	60	2	254	0.0× / 0.8
Surveys · Persian Gulf	0	60	2	240	0.0× / 0.8
Other · South China Sea	0	60	2	320	— / 0
Wrecks · South China Sealong running	0	60	2	921	— / 0
Volcanic · South Pacific Ocean	0	60	2	86	— / 0
Wrecks · South Pacific Ocean	0	60	2	227	0.0× / 0.6
Wrecks · Tasman Sea	0	60	2	346	— / 0
Surveys · The Northwestern Passages	0	60	2	191	— / 0
Ordnance · Tyrrhenian Sea	0	60	2	165	0.0× / 0.2
Wrecks · Tyrrhenian Sealong running	0	60	2	405	— / 0
Nav aids · Red Sea	0	51.8	1	167	0.0× / 0.2
Incidents · South China Sea	0	47.7	1	57	0.0× / 2.2
Cable ops · Gulf of Guinea	0	31	1	107	0.0× / 0.6
Cable ops · Andaman or Burma Sea	0	30	1	42	0.0× / 0.2
Surveys · Arabian Sealong running	0	30	1	475	— / 0
Wrecks · Arabian Sealong running	0	30	1	373	0.0× / 0.4
Debris · Arctic Oceanlong running	0	30	1	860	— / 0
Restricted · Bay of Bengallong running	0	30	1	377	0.0× / 0.2
Incidents · Bismarck Sea	0	30	1	34	0.0× / 0.2
Surveys · Black Sea	0	30	1	38	0.0× / 0.8
Other · Caribbean Sea	0	30	1	154	0.0× / 0.2
Restricted · Caribbean Sea	0	30	1	76	— / 0
Wrecks · Caribbean Sea	0	30	1	182	— / 0
Surveys · Chukchi Sealong running	0	30	1	741	0.0× / 0.2
Other · Eastern China Sealong running	0	30	1	399	0.0× / 0.2
Surveys · Greenland Sealong running	0	30	1	1,524	— / 0
Wrecks · Gulf of Guinea	0	30	1	199	— / 0
Other · Gulf of Mexicolong running	0	30	1	525	— / 0
Other · Gulf of Suezlong running	0	30	1	423	0.0× / 0.2
Other · Gulf of Thailand	0	30	1	137	— / 0
Restricted · Indian Oceanlong running	0	30	1	736	0.0× / 0.2
Surveys · Indian Ocean	0	30	1	208	0.0× / 0.4
Wrecks · Indian Oceanlong running	0	30	1	875	— / 0
Nav aids · Ionian Sealong running	0	30	1	368	0.0× / 0.4
Wrecks · Irish Sea and St. George's Channellong running	0	30	1	963	0.0× / 0.2
Other · Laccadive Sea	0	30	1	77	0.0× / 0.4
Wrecks · Laccadive Sea	0	30	1	75	— / 0
Nav aids · Malacca Straitlong running	0	30	1	578	0.0× / 0.2
Wrecks · Malacca Straitlong running	0	30	1	398	— / 0
Restricted · Mediterranean Sea - Eastern Basin	0	30	1	328	— / 0
Incidents · Mediterranean Sea - Western Basin	0	30	1	43	0.0× / 1.2
Wrecks · North Atlantic Oceanlong running	0	30	1	452	— / 0
Restricted · North Pacific Ocean	0	30	1	343	— / 0
Surveys · North Pacific Oceanlong running	0	30	1	637	0.0× / 0.2
Volcanic · North Pacific Oceanlong running	0	30	1	478	— / 0

Cite: seahazards.com Sea Ledger, 2007-04, 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.