Sea Ledger, April 2006

2006-04-01 to 2006-04-30 · archive

issued: 357
warning-days in force: 10,805
in force at month end: 403
sea × type cells: 213

baseline: same month, previous 5 years (2005-04, 2004-04, 2003-04, 2002-04, 2001-04)

By type

type	issued	warning-days	in force at end
Exercises	91	1,078.1	35
Incidents	63	1,245.3	54
Quakes	44	112.2	11
Nav aids	40	3,267.6	118
Cable ops	31	846.2	34
Other	20	687.6	27
Surveys	18	996.2	33
Derelicts	9	107	2
Icebergs	9	54.1	2
Spills	8	89	6
Wrecks	6	1,496.1	52
Missiles	5	60	2
Restricted	3	212.5	8
Ordnance	3	205.8	7
Structures	2	86	4
Containers	2	12.9	0
Volcanic	1	121.8	4
Piracy	1	60.1	2
Debris	1	66.4	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Quakes · South Pacific Ocean	19	39.5	8	30	1.8× / 10.4
Exercises · Aegean Seasurge	13	288	16	124	11× / 1.2
Incidents · Philippine Seasurge	12	154.2	7	65	3.3× / 3.6
Exercises · North Pacific Ocean	12	79.4	1	35	1.6× / 7.4
Incidents · North Pacific Ocean	11	128.5	6	58	1.5× / 7.4
Exercises · South Atlantic Oceansurge	10	88.2	3	58	8.3× / 1.2
Exercises · Laccadive Sea	10	44.1	1	30	1.3× / 7.6
Incidents · South Pacific Ocean	9	93.3	5	68	1.3× / 6.8
Cable ops · South Atlantic Ocean	9	38	3	76	0.3× / 33
Incidents · South Atlantic Ocean	8	155.9	8	55	1.7× / 4.6
Icebergs · South Atlantic Oceansurge	8	47.3	2	33	3.6× / 2.2
Incidents · Tasman Seasurge	6	8.9	2	20	5.0× / 1.2
Nav aids · South Atlantic Oceansurgelong running	5	177.5	7	505	2.1× / 2.4
Incidents · Indian Oceanlong running	5	146.5	5	379	1.1× / 4.6
Exercises · Japan Seasurge	5	80.1	2	37	3.1× / 1.6
Missiles · North Pacific Ocean	5	60	2	90	1.0× / 5
Incidents · Coral Sea	5	50.6	3	33	1.6× / 3.2
Quakes · Philippine Seasurge	5	17.9	0	—	5.0× / 1
Nav aids · North Sealong running	4	294.3	10	530	1.3× / 3.2
Cable ops · Bay of Bengalsurge	4	270.7	9	145	4.0× / 1
Nav aids · Irish Sea and St. George's Channelsurge	4	81.2	3	52	6.7× / 0.6
Exercises · Yellow Seasurge	4	75.7	3	37	10× / 0.4
Nav aids · Coral Sealong running	4	53.8	3	665	1.5× / 2.6
Exercises · Tyrrhenian Sea	4	47.5	2	26	1.8× / 2.2
Other · South Atlantic Oceansurge	4	30.3	0	—	10× / 0.4
Exercises · South Pacific Ocean	4	22.8	0	—	1.3× / 3.2
Quakes · Ionian Seanew	4	12	0	—	new / 0
Exercises · Mediterranean Sea - Eastern Basin	4	11.7	0	—	1.2× / 3.4
Quakes · Indian Ocean	4	10.8	1	25	0.5× / 7.4
Quakes · Bering Seasurge	4	10.3	1	18	20× / 0.2
Other · North Pacific Oceansurge	3	120.2	5	109	3.0× / 1
Exercises · North Atlantic Ocean	3	62.9	0	—	0.3× / 11.4
Surveys · North Atlantic Ocean	3	61.2	1	27	1.1× / 2.8
Surveys · Mediterranean Sea - Eastern Basinsurge	3	54.1	3	34	5.0× / 0.6
Exercises · Persian Gulfsurge	3	49.3	1	68	3.8× / 0.8
Other · Tyrrhenian Seasurge	3	32.8	1	82	15× / 0.2
Cable ops · Black Seasurge	3	30	1	48	5.0× / 0.6
Spills · Gulf of Mexico	3	28	3	11	0.8× / 3.8
Exercises · Black Sea	3	25.4	1	39	0.5× / 5.6
Exercises · South China Seasurge	3	25.4	0	—	15× / 0.2
Surveys · Celtic Sea	3	17.8	1	11	1.1× / 2.8
Exercises · Bay of Bengal	3	16.4	0	—	0.5× / 6
Quakes · Coral Sea	3	6.7	1	27	1.1× / 2.8
Nav aids · Bay of Bengalnewlong running	2	389.9	14	431	new / 0
Ordnance · North Sea	2	139.7	4	317	5.0× / 0.4
Nav aids · Mediterranean Sea - Western Basin	2	108.8	5	65	1.1× / 1.8
Nav aids · Gulf of Mexicolong running	2	102.6	4	384	2.5× / 0.8
Exercises · Ionian Sea	2	93.3	3	124	1.4× / 1.4
Nav aids · Gulf of Suez	2	83.4	3	59	3.3× / 0.6
Nav aids · Tyrrhenian Sealong running	2	66.6	3	528	0.7× / 2.8
Wrecks · South Pacific Oceanlong running	2	63.4	3	700	10× / 0.2
Incidents · Mozambique Channel	2	56.6	2	28	10× / 0.2
Cable ops · North Atlantic Ocean	2	55.9	2	167	0.4× / 4.8
Other · South Pacific Ocean	2	49.5	2	69	3.3× / 0.6
Incidents · Gulf of Guineanew	2	29.7	2	20	new / 0
Cable ops · North Sea	2	27.7	2	31	0.8× / 2.6
Spills · North Atlantic Ocean	2	21	1	26	1.4× / 1.4
Other · North Atlantic Ocean	2	11.7	1	8	0.8× / 2.4
Exercises · Arabian Sea	2	9.2	0	—	0.5× / 4.4
Nav aids · Arafura Seanew	2	8.3	1	29	new / 0
Exercises · Philippine Seanew	2	8.2	0	—	new / 0
Cable ops · Caribbean Sea	2	7.3	1	17	5.0× / 0.4
Spills · Caribbean Seanew	2	7	2	4	new / 0
Quakes · North Pacific Ocean	2	6	0	—	0.3× / 6.2
Other · North Sea	2	5.7	2	30	1.3× / 1.6
Derelicts · North Pacific Ocean	2	5	0	—	2.5× / 0.8
Exercises · Bering Sea	2	4.2	0	—	2.5× / 0.8
Nav aids · Caribbean Sea	1	204.5	7	321	new / 0
Wrecks · Arabian Sealong running	1	158.1	6	607	5.0× / 0.2
Nav aids · North Pacific Oceanlong running	1	156.1	6	617	new / 0
Nav aids · South Pacific Ocean	1	154.4	6	115	0.5× / 2.2
Nav aids · Inner Seas off the West Coast of Scotland	1	142.7	4	257	0.3× / 3.6
Nav aids · Mediterranean Sea - Eastern Basinlong running	1	69.4	3	618	2.5× / 0.4
Cable ops · Persian Gulf	1	66.6	3	62	2.5× / 0.4
Incidents · Mediterranean Sea - Eastern Basinlong running	1	66.4	3	376	0.2× / 4.4
Cable ops · Mediterranean Sea - Eastern Basin	1	64.4	3	66	0.3× / 3.2
Other · Gulf of Suez	1	59.3	2	58	new / 0
Structures · Gulf of Mexico	1	54.3	2	116	new / 0
Wrecks · Coral Sea	1	50.5	2	95	new / 0
Restricted · Mediterranean Sea - Western Basin	1	50.3	2	33	new / 0
Cable ops · Tasman Sea	1	50.1	2	91	1.3× / 0.8
Surveys · Persian Gulf	1	43.9	2	67	1.3× / 0.8
Cable ops · Arabian Sea	1	42.7	1	95	0.4× / 2.8
Other · Eastern China Sea	1	42.3	2	34	new / 0
Incidents · North Atlantic Ocean	1	42	1	67	0.2× / 5.4
Restricted · North Sea	1	41.2	2	138	new / 0
Surveys · Bay of Bengal	1	37.6	2	67	1.3× / 0.8
Other · Caribbean Sea	1	35.5	1	32	new / 0
Volcanic · Philippine Sea	1	35.4	2	66	5.0× / 0.2
Cable ops · South Pacific Ocean	1	34.5	1	43	1.0× / 1
Nav aids · North Atlantic Ocean	1	31.9	1	103	0.3× / 3
Structures · Persian Gulflong running	1	31.7	2	559	new / 0
Nav aids · Celtic Sea	1	30.8	1	143	0.7× / 1.4
Derelicts · Celtic Sea	1	30.2	1	40	1.7× / 0.6
Surveys · South Pacific Ocean	1	30	1	102	5.0× / 0.2
Cable ops · Tyrrhenian Sea	1	26.5	1	26	1.0× / 1
Nav aids · Bering Sea	1	24.2	1	24	new / 0
Surveys · Black Sea	1	23.6	0	—	1.7× / 0.6
Cable ops · Yellow Sea	1	23.3	1	23	new / 0
Wrecks · Philippine Sea	1	20.4	1	20	new / 0
Nav aids · Indian Ocean	1	19.6	1	19	1.7× / 0.6
Surveys · Indian Ocean	1	18.7	1	38	5.0× / 0.2
Cable ops · Eastern China Sea	1	17.4	1	17	1.7× / 0.6
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	5.0× / 0.2
Restricted · Bay of Bengal	1	12.5	1	12	new / 0
Derelicts · Adriatic Sea	1	10.2	1	10	new / 0
Surveys · Ionian Sea	1	9.8	0	—	5.0× / 0.2
Surveys · Mediterranean Sea - Western Basin	1	9.6	0	—	2.5× / 0.4
Incidents · Andaman or Burma Sea	1	7.9	1	7	new / 0
Surveys · North Sea	1	7.1	0	—	1.7× / 0.6
Containers · North Atlantic Ocean	1	6.8	0	—	1.3× / 0.8
Icebergs · South Pacific Ocean	1	6.8	0	—	new / 0
Derelicts · Japan Sea	1	6.6	0	—	new / 0
Debris · Bay of Biscay	1	6.4	0	—	new / 0
Derelicts · South Atlantic Ocean	1	6.4	0	—	1.0× / 1
Cable ops · Andaman or Burma Sea	1	6.2	1	6	new / 0
Containers · Caribbean Sea	1	6.1	0	—	new / 0
Ordnance · English Channel	1	6.1	1	6	new / 0
Derelicts · Ionian Sea	1	6.1	0	—	5.0× / 0.2
Derelicts · South Pacific Ocean	1	6	0	—	2.5× / 0.4
Derelicts · Tasman Sea	1	5.9	0	—	5.0× / 0.2
Nav aids · Ionian Sea	1	3.7	1	3	5.0× / 0.2
Wrecks · Mediterranean Sea - Western Basin	1	3.7	0	—	5.0× / 0.2
Quakes · Arabian Sea	1	3	0	—	new / 0
Quakes · Celebes Sea	1	3	0	—	5.0× / 0.2
Quakes · North Atlantic Ocean	1	3	0	—	2.5× / 0.4
Exercises · Adriatic Sea	1	2.5	1	2	1.3× / 0.8
Exercises · Andaman or Burma Sea	1	1.9	0	—	2.5× / 0.4
Surveys · Philippine Sea	1	1.7	1	1	2.5× / 0.4
Nav aids · Bass Strait	1	0.6	0	—	1.3× / 0.8
Other · Malacca Strait	1	0.3	1	0	new / 0
Piracy · Java Sea	1	0.1	0	—	new / 0
Nav aids · Arabian Sealong running	0	317.5	10	620	0.0× / 1.6
Wrecks · North Sealong running	0	180	6	555	— / 0
Nav aids · English Channel	0	150.3	5	359	0.0× / 2.2
Surveys · Baffin Baylong running	0	150	5	941	— / 0
Nav aids · Laccadive Sea	0	150	5	124	0.0× / 1.2
Nav aids · Mozambique Channellong running	0	150	5	383	0.0× / 0.8
Wrecks · Mediterranean Sea - Eastern Basinlong running	0	120	4	671	— / 0
Wrecks · South China Sealong running	0	120	4	610	— / 0
Surveys · Arabian Sealong running	0	117.4	3	407	— / 0
Incidents · South China Sea	0	101.6	3	64	0.0× / 2.8
Nav aids · Andaman or Burma Sea	0	90	3	179	0.0× / 0.2
Surveys · Arctic Oceanlong running	0	90	3	843	— / 0
Surveys · Beaufort Sealong running	0	90	3	843	— / 0
Wrecks · English Channel	0	90	3	327	0.0× / 0.2
Wrecks · Irish Sea and St. George's Channellong running	0	90	3	601	0.0× / 0.2
Other · Persian Gulf	0	90	3	200	0.0× / 1.6
Incidents · Laccadive Sea	0	71.6	2	65	0.0× / 0.4
Other · Arabian Sea	0	60	2	135	0.0× / 0.6
Wrecks · Caribbean Sealong running	0	60	2	466	— / 0
Nav aids · Malacca Strait	0	60	2	213	0.0× / 0.2
Wrecks · Mozambique Channel	0	60	2	75	— / 0
Wrecks · North Atlantic Ocean	0	60	2	108	— / 0
Piracy · Persian Gulflong running	0	60	2	446	— / 0
Nav aids · Tasman Sealong running	0	60	2	616	0.0× / 1.2
Wrecks · Yellow Sealong running	0	60	2	683	— / 0
Volcanic · South Pacific Ocean	0	56.4	1	41	— / 0
Restricted · North Atlantic Ocean	0	48.5	1	34	0.0× / 0.2
Surveys · Tyrrhenian Sea	0	39.7	1	48	0.0× / 0.8
Surveys · South Atlantic Ocean	0	39	1	71	0.0× / 5.6
Incidents · Adriatic Sea	0	30	1	55	0.0× / 0.2
Wrecks · Andaman or Burma Sea	0	30	1	205	— / 0
Ordnance · Arabian Sea	0	30	1	113	— / 0
Incidents · Arabian Sea	0	30	1	30	0.0× / 0.4
Wrecks · Arafura Sea	0	30	1	50	— / 0
Debris · Arctic Oceanlong running	0	30	1	495	— / 0
Ordnance · Bay of Bengal	0	30	1	117	— / 0
Other · Bay of Bengallong running	0	30	1	397	— / 0
Incidents · Bay of Bengal	0	30	1	54	0.0× / 0.2
Surveys · Chukchi Sealong running	0	30	1	376	0.0× / 0.2
Surveys · Greenland Sealong running	0	30	1	1,159	— / 0
Incidents · Gulf of Aden	0	30	1	40	— / 0
Other · Gulf of Mexico	0	30	1	160	— / 0
Wrecks · Gulf of Mexico	0	30	1	215	0.0× / 0.2
Other · Indian Ocean	0	30	1	38	0.0× / 0.4
Restricted · Indian Oceanlong running	0	30	1	371	0.0× / 0.2
Wrecks · Indian Oceanlong running	0	30	1	510	— / 0
Wrecks · Kattegat	0	30	1	162	— / 0
Surveys · Laccadive Sea	0	30	1	111	— / 0
Wrecks · Malacca Strait	0	30	1	33	0.0× / 0.2
Exercises · Mediterranean Sea - Western Basin	0	30	1	37	0.0× / 3
Other · Mozambique Channel	0	30	1	124	— / 0
Debris · North Pacific Ocean	0	30	1	319	0.0× / 0.2
Surveys · North Pacific Ocean	0	30	1	272	0.0× / 0.2
Volcanic · North Pacific Ocean	0	30	1	113	— / 0
Wrecks · North Pacific Ocean	0	30	1	115	0.0× / 0.2
Other · Norwegian Sea	0	30	1	38	— / 0
Restricted · Persian Gulf	0	30	1	151	— / 0
Wrecks · Persian Gulf	0	30	1	112	0.0× / 0.8
Cable ops · Red Sea	0	30	1	47	— / 0
Nav aids · Red Sealong running	0	30	1	636	0.0× / 0.2
Wrecks · Red Sea	0	30	1	167	— / 0
Surveys · Sea of Marmara	0	30	1	43	— / 0
Wrecks · Singapore Straitlong running	0	30	1	706	— / 0
Wrecks · South Atlantic Oceanlong running	0	30	1	413	0.0× / 0.4
Cable ops · South China Sea	0	30	1	187	0.0× / 1.8
Nav aids · Southern Ocean	0	30	1	47	0.0× / 0.2
Wrecks · Tyrrhenian Sea	0	30	1	40	— / 0
Nav aids · Persian Gulf	0	25.5	0	—	0.0× / 1

Cite: seahazards.com Sea Ledger, 2006-04, 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.