Sea Ledger, April 2005

2005-04-01 to 2005-04-30 · archive

issued: 330
warning-days in force: 8,480
in force at month end: 290
sea × type cells: 187

baseline: same month, previous 5 years (2004-04, 2003-04, 2002-04, 2001-04, 2000-04)

By type

type	issued	warning-days	in force at end
Exercises	69	778.3	19
Cable ops	56	830.4	34
Incidents	44	1,369.8	45
Quakes	44	146.3	1
Nav aids	41	2,470.5	84
Icebergs	15	130.2	3
Other	14	402.1	16
Surveys	14	829.8	28
Spills	8	88	6
Wrecks	5	944.3	34
Missiles	5	62.3	3
Derelicts	4	91.6	3
Restricted	3	12.8	1
Debris	3	73.8	3
Ordnance	3	59.6	3
Containers	2	10	1
War risk	0	30	1
Piracy	0	60	2
Structures	0	60	2
Volcanic	0	30	1

By sea and type · 187 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Quakes · Indian Oceansurge	25	81.9	1	32	9.6× / 2.6
Cable ops · South Atlantic Ocean	23	128.9	6	50	0.6× / 41.4
Exercises · North Atlantic Ocean	12	137.7	4	115	1.1× / 11.2
Exercises · Laccadive Sea	10	49.4	2	30	1.8× / 5.6
Exercises · North Pacific Ocean	10	40.9	1	27	1.5× / 6.6
Incidents · North Pacific Ocean	9	256.9	12	71	1.4× / 6.6
Incidents · Mediterranean Sea - Eastern Basinsurge	9	169.1	7	68	3.2× / 2.8
Quakes · South Pacific Ocean	8	29.9	0	—	0.7× / 11
Exercises · South Pacific Oceansurge	8	20.9	0	—	5.0× / 1.6
Exercises · Bay of Bengal	7	24.2	1	29	1.4× / 5
Cable ops · Mediterranean Sea - Eastern Basinsurge	6	103	4	144	2.3× / 2.6
Icebergs · North Atlantic Oceansurge	6	41	0	—	4.3× / 1.4
Incidents · South Pacific Ocean	5	272.6	7	306	0.7× / 7.2
Nav aids · Inner Seas off the West Coast of Scotlandlong running	5	64.8	3	635	1.5× / 3.4
Missiles · North Pacific Ocean	5	62.3	3	34	1.0× / 5
Cable ops · Arabian Seasurge	5	54.3	4	52	2.5× / 2
Spills · Gulf of Mexico	5	46	3	30	1.6× / 3.2
Nav aids · English Channelsurge	4	187.5	3	137	2.5× / 1.6
Nav aids · Arabian Seasurge	4	178.5	8	291	4.0× / 1
Incidents · Indian Ocean	4	79.1	5	38	0.9× / 4.6
Icebergs · South Atlantic Ocean	4	56.8	2	30	1.4× / 2.8
Exercises · Black Sea	4	26.4	0	—	0.7× / 6
Icebergs · Labrador Seasurge	4	25.5	1	11	5.0× / 0.8
Quakes · North Pacific Ocean	4	12	0	—	0.7× / 6
Nav aids · Tyrrhenian Sea	3	183.7	5	163	1.1× / 2.6
Nav aids · South Atlantic Ocean	3	166.4	5	140	1.0× / 3
Incidents · Philippine Sea	3	129.5	3	72	0.8× / 4
Nav aids · North Sea	3	110.5	4	165	0.7× / 4.6
Incidents · Bay of Biscaysurge	3	82.8	3	27	7.5× / 0.4
Nav aids · Mediterranean Sea - Western Basinsurge	3	57.6	2	130	2.5× / 1.2
Exercises · Mediterranean Sea - Eastern Basin	3	38.7	1	32	0.8× / 4
Cable ops · Tyrrhenian Seasurge	3	37.2	2	37	7.5× / 0.4
Incidents · South Atlantic Ocean	3	34.4	1	45	0.6× / 5.2
Cable ops · Celtic Sea	3	33.7	1	19	1.1× / 2.6
Other · North Sea	3	24.7	3	11	1.7× / 1.8
Cable ops · Mediterranean Sea - Western Basinsurge	3	22.8	2	11	7.5× / 0.4
Nav aids · Coral Sea	2	134.6	5	313	0.7× / 2.8
Incidents · North Atlantic Ocean	2	129.6	2	60	0.3× / 6.2
Cable ops · Bay of Bengal	2	122.5	5	133	3.3× / 0.6
Surveys · Bay of Bengal	2	118.6	3	179	5.0× / 0.4
Exercises · Japan Sea	2	67.6	1	34	1.1× / 1.8
Exercises · Yellow Seanew	2	65	2	36	new / 0
Nav aids · Mozambique Channel	2	62.7	2	361	5.0× / 0.4
Cable ops · South China Sea	2	58.2	2	36	1.4× / 1.4
Cable ops · Java Sea	2	49.6	1	46	10× / 0.2
Surveys · South Atlantic Ocean	2	37.4	1	50	0.4× / 5.2
Exercises · Tyrrhenian Sea	2	33.7	0	—	0.8× / 2.4
Nav aids · North Atlantic Oceanlong running	2	31.2	1	376	0.7× / 2.8
Other · South Pacific Ocean	2	30.8	2	28	10× / 0.2
Ordnance · North Seanew	2	27.3	2	23	new / 0
Exercises · Mediterranean Sea - Western Basin	2	25.7	1	39	0.6× / 3.4
Nav aids · Indian Ocean	2	23.8	2	21	10× / 0.2
Spills · North Atlantic Ocean	2	22	2	41	1.0× / 2
Exercises · Persian Gulf	2	13.9	0	—	5.0× / 0.4
Exercises · Arabian Sea	2	8.8	0	—	0.5× / 4
Cable ops · North Sea	2	7.3	1	21	0.5× / 3.8
Other · English Channel	2	6.9	0	—	3.3× / 0.6
Quakes · Philippine Sea	2	6	0	—	1.3× / 1.6
Nav aids · Tasman Sea	1	137.2	5	251	0.8× / 1.2
Nav aids · South Pacific Ocean	1	109.2	4	229	0.5× / 2
Wrecks · Irish Sea and St. George's Channel	1	95.3	4	236	new / 0
Incidents · South China Sea	1	92.3	3	72	0.4× / 2.8
Wrecks · Arabian Sea	1	83.5	3	242	new / 0
Exercises · Ionian Sea	1	62.1	2	117	0.7× / 1.4
Nav aids · Irish Sea and St. George's Channel	1	53.2	1	284	1.0× / 1
Nav aids · Bass Strait	1	51.6	2	81	1.3× / 0.8
Other · Persian Gulflong running	1	49.6	1	543	0.7× / 1.4
Wrecks · North Pacific Ocean	1	47	2	96	new / 0
Wrecks · South Pacific Ocean	1	44.4	2	335	new / 0
Incidents · Tasman Sea	1	37.2	1	50	0.8× / 1.2
Nav aids · Great Australian Bight	1	33.3	2	147	2.5× / 0.4
Exercises · Malacca Strait	1	32.9	1	34	1.7× / 0.6
Cable ops · Gulf of Suez	1	31.4	2	92	2.5× / 0.4
Nav aids · Laccadive Sea	1	31.4	2	319	1.0× / 1
Surveys · North Atlantic Ocean	1	31.2	2	68	0.3× / 3
Surveys · Alboran Sea	1	30	1	110	5.0× / 0.2
Other · Singapore Strait	1	29.4	1	29	new / 0
Incidents · Coral Sea	1	28.2	0	—	0.3× / 4
Derelicts · Indian Ocean	1	27.6	1	27	1.3× / 0.8
Derelicts · Red Sea	1	27.6	1	27	new / 0
Incidents · Arabian Sea	1	26.6	1	26	2.5× / 0.4
Surveys · Persian Gulf	1	26.6	0	—	1.7× / 0.6
Cable ops · Black Sea	1	24.4	0	—	2.5× / 0.4
Surveys · Mediterranean Sea - Eastern Basin	1	23.5	1	43	2.5× / 0.4
Other · Arabian Sea	1	22.5	1	22	2.5× / 0.4
Nav aids · Gulf of Mexico	1	19.4	1	19	0.7× / 1.4
Surveys · North Pacific Ocean	1	17.6	1	17	new / 0
Surveys · South China Sea	1	17.4	1	17	5.0× / 0.2
Cable ops · North Atlantic Ocean	1	15.1	0	—	0.1× / 9.2
Nav aids · Bristol Channel	1	14.5	1	14	new / 0
Wrecks · Gulf of Suez	1	14.1	1	14	new / 0
Surveys · Bay of Biscay	1	12.3	0	—	new / 0
Surveys · Bering Sea	1	11.5	1	11	new / 0
Surveys · Chukchi Sea	1	11.5	1	11	new / 0
Surveys · Tyrrhenian Sea	1	7.2	0	—	0.8× / 1.2
Icebergs · Southern Ocean	1	6.9	0	—	0.6× / 1.6
Debris · South Pacific Ocean	1	6.8	0	—	new / 0
Containers · North Pacific Ocean	1	6.4	0	—	new / 0
Restricted · Indian Ocean	1	6.3	1	6	new / 0
Derelicts · Arafura Sea	1	6.2	0	—	2.5× / 0.4
Other · Celtic Sea	1	6.2	0	—	1.7× / 0.6
Incidents · Mediterranean Sea - Western Basin	1	6.1	0	—	1.0× / 1
Exercises · Indian Ocean	1	5.2	1	5	2.5× / 0.4
Cable ops · English Channel	1	5.1	0	—	0.4× / 2.8
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	5	1	5	new / 0
Restricted · North Atlantic Ocean	1	4.3	0	—	new / 0
Containers · North Atlantic Ocean	1	3.6	1	3	1.3× / 0.8
Debris · Caribbean Sea	1	3.5	1	3	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.3× / 0.8
Quakes · Greenland Sea	1	3	0	—	new / 0
Quakes · Gulf of Alaska	1	3	0	—	new / 0
Quakes · Japan Sea	1	3	0	—	5.0× / 0.2
Quakes · Molukka Sea	1	3	0	—	1.7× / 0.6
Cable ops · Ionian Sea	1	2.4	1	2	new / 0
Other · North Atlantic Ocean	1	2.4	1	2	0.3× / 3
Ordnance · Tyrrhenian Sea	1	2.3	0	—	new / 0
Restricted · Alboran Sea	1	2.2	0	—	5.0× / 0.2
Other · Laccadive Sea	1	2.1	0	—	5.0× / 0.2
Other · Tyrrhenian Sea	1	0.9	0	—	5.0× / 0.2
Incidents · Arafura Sea	1	0.3	0	—	1.7× / 0.6
Derelicts · Celtic Sea	1	0.2	0	—	2.5× / 0.4
Debris · Irish Sea and St. George's Channel	1	0.1	0	—	new / 0
Nav aids · Bay of Bengallong running	0	240	8	577	— / 0
Surveys · Baffin Baylong running	0	150	5	576	— / 0
Wrecks · Persian Gulf	0	150	5	192	0.0× / 0.8
Nav aids · Andaman or Burma Sea	0	126.5	4	304	0.0× / 0.2
Exercises · Aegean Sea	0	115.4	2	117	0.0× / 1.6
Surveys · Beaufort Sealong running	0	90	3	478	— / 0
Surveys · Arabian Sea	0	60	2	49	— / 0
Surveys · Arctic Oceanlong running	0	60	2	478	— / 0
Other · Bay of Bengal	0	60	2	59	— / 0
Nav aids · Celtic Sea	0	60	2	175	0.0× / 2.2
Other · Coral Sea	0	60	2	309	— / 0
Wrecks · Mediterranean Sea - Eastern Basin	0	60	2	306	— / 0
Nav aids · North Pacific Ocean	0	60	2	252	0.0× / 0.2
Wrecks · North Sea	0	60	2	190	— / 0
Piracy · Persian Gulf	0	60	2	81	— / 0
Nav aids · Red Sea	0	60	2	271	0.0× / 0.2
Wrecks · South China Sea	0	60	2	245	— / 0
Wrecks · Yellow Sea	0	60	2	318	— / 0
Nav aids · Ionian Sealong running	0	57.6	1	523	0.0× / 0.4
Cable ops · Laccadive Sea	0	40	1	52	0.0× / 0.4
Nav aids · Persian Gulflong running	0	35.3	1	1,243	0.0× / 1.8
Debris · North Pacific Ocean	0	33.4	1	318	0.0× / 0.2
Structures · Adriatic Sea	0	30	1	225	— / 0
Debris · Arctic Ocean	0	30	1	130	— / 0
Surveys · Balearic (Iberian Sea)long running	0	30	1	646	— / 0
Wrecks · Bass Straitlong running	0	30	1	365	0.0× / 0.2
Wrecks · Bay of Bengal	0	30	1	339	— / 0
Nav aids · Caribbean Sea	0	30	1	134	0.0× / 0.4
Wrecks · Caribbean Sea	0	30	1	101	— / 0
Surveys · Greenland Sealong running	0	30	1	794	— / 0
Cable ops · Gulf of Mexico	0	30	1	116	— / 0
Wrecks · Gulf of Mexico	0	30	1	215	0.0× / 0.2
Ordnance · Gulf of Oman	0	30	1	305	— / 0
Nav aids · Gulf of Suez	0	30	1	154	0.0× / 0.6
Surveys · Indian Ocean	0	30	1	117	0.0× / 0.2
Wrecks · Indian Ocean	0	30	1	145	— / 0
Wrecks · Laccadive Sea	0	30	1	291	— / 0
Wrecks · Malacca Strait	0	30	1	204	0.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basin	0	30	1	253	0.0× / 0.4
Other · Mediterranean Sea - Eastern Basin	0	30	1	33	0.0× / 0.2
Other · North Pacific Ocean	0	30	1	96	0.0× / 1
Structures · Persian Gulf	0	30	1	194	— / 0
War risk · Persian Gulf	0	30	1	362	— / 0
Nav aids · Philippine Sea	0	30	1	274	— / 0
Volcanic · Philippine Sea	0	30	1	88	0.0× / 0.2
Nav aids · Singapore Strait	0	30	1	55	0.0× / 0.2
Wrecks · Singapore Strait	0	30	1	341	— / 0
Wrecks · South Atlantic Ocean	0	30	1	48	0.0× / 0.4
Derelicts · South China Sea	0	30	1	36	0.0× / 0.2
Nav aids · South China Sealong running	0	30	1	682	— / 0
Cable ops · South Pacific Ocean	0	30	1	63	0.0× / 1.2
Other · Tasman Sea	0	30	1	172	0.0× / 0.2
Surveys · Tasman Sea	0	30	1	95	0.0× / 0.6
Cable ops · Tasman Sea	0	29.9	0	—	0.0× / 0.8
Incidents · Bay of Bengal	0	19.4	0	—	0.0× / 0.6
Other · Andaman or Burma Sea	0	12.6	0	—	— / 0
Spills · Caribbean Sea	0	12	0	—	— / 0
Exercises · South Atlantic Ocean	0	9.8	0	—	0.0× / 1.6
Incidents · Bismarck Sea	0	5.7	0	—	0.0× / 0.4
Cable ops · Makassar Strait	0	4.6	0	—	— / 0
Surveys · North Sea	0	4.5	0	—	0.0× / 3
Other · South Atlantic Ocean	0	4	0	—	0.0× / 0.8
Spills · North Pacific Ocean	0	3	0	—	0.0× / 0.6
Quakes · Solomon Sea	0	1.5	0	—	0.0× / 1.6
Surveys · Bass Strait	0	0.5	0	—	— / 0

Cite: seahazards.com Sea Ledger, 2005-04, 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.