Sea Ledger, April 2004

2004-04-01 to 2004-04-30 · archive

issued: 340
warning-days in force: 5,243
in force at month end: 191
sea × type cells: 166

baseline: same month, previous 5 years (2003-04, 2002-04, 2001-04, 2000-04, 1999-04)

By type

type	issued	warning-days	in force at end
Exercises	70	835.7	29
Incidents	63	634.9	29
Cable ops	47	647.3	25
Quakes	46	136.3	3
Nav aids	38	1,314.3	44
Surveys	31	639.2	24
Other	13	299.1	9
Derelicts	8	40.3	2
Icebergs	7	25.1	1
Missiles	6	60	2
Spills	5	70	4
Wrecks	3	431.8	14
Towing	1	11.5	1
Containers	1	6.7	0
Volcanic	1	0.3	1
War risk	0	60	2
Restricted	0	30	1

By sea and type · 166 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Surveys · South Atlantic Oceansurge	19	69.2	3	82	14× / 1.4
Quakes · South Pacific Oceansurge	19	56.5	1	27	2.2× / 8.8
Cable ops · South Atlantic Ocean	17	44.7	3	31	0.4× / 38.6
Exercises · Laccadive Seasurge	11	69.4	1	35	3.2× / 3.4
Exercises · North Pacific Ocean	11	39.1	3	15	2.0× / 5.6
Incidents · South Pacific Ocean	9	76.8	4	57	1.7× / 5.4
Incidents · North Pacific Ocean	9	57	4	70	1.3× / 6.8
Incidents · South Atlantic Ocean	7	73.2	3	190	1.5× / 4.6
Exercises · Black Sea	7	45.2	1	43	1.3× / 5.4
Quakes · North Pacific Ocean	7	19.8	2	27	1.4× / 5.2
Exercises · North Atlantic Ocean	6	100	3	113	0.5× / 12.4
Missiles · North Pacific Ocean	6	60	2	36	1.2× / 5
Incidents · Mediterranean Sea - Eastern Basinsurge	6	54.4	4	64	3.0× / 2
Quakes · Coral Seasurge	6	18	0	—	2.7× / 2.2
Cable ops · Arabian Seasurge	5	152.7	4	76	5.0× / 1
Nav aids · Tyrrhenian Seasurge	5	123.4	5	197	2.3× / 2.2
Incidents · South China Seasurge	5	63.1	3	53	2.5× / 2
Exercises · Mediterranean Sea - Eastern Basin	5	62	2	65	1.7× / 3
Nav aids · Coral Sea	5	44.4	2	161	1.6× / 3.2
Incidents · Coral Sea	5	34.4	1	62	1.7× / 3
Nav aids · Inner Seas off the West Coast of Scotland	5	31.5	1	270	1.6× / 3.2
Incidents · North Atlantic Ocean	5	26.8	1	29	0.8× / 6
Exercises · Bay of Bengal	5	23.7	1	32	1.3× / 4
Nav aids · South Pacific Oceansurge	4	131.2	5	121	2.5× / 1.6
Spills · Gulf of Mexico	4	37	3	43	1.3× / 3
Exercises · Mediterranean Sea - Western Basin	4	28	2	55	1.3× / 3
Icebergs · Labrador Seanew	4	17.3	0	—	new / 0
Cable ops · Mediterranean Sea - Eastern Basin	4	15	1	23	1.8× / 2.2
Nav aids · North Atlantic Oceanlong running	3	77.1	3	387	0.8× / 3.8
Surveys · Tasman Seanew	3	60	2	36	new / 0
Cable ops · North Sea	3	26.6	1	28	0.8× / 3.8
Exercises · Red Seasurge	3	19.4	2	23	7.5× / 0.4
Nav aids · North Sea	3	18.2	0	—	0.4× / 6.8
Exercises · Japan Seasurge	3	16.4	0	—	2.1× / 1.4
Quakes · Indian Ocean	3	9	0	—	1.4× / 2.2
Exercises · Arabian Sea	3	6.6	1	30	0.9× / 3.4
Other · English Channelnew	3	3	1	26	new / 0
Nav aids · South Atlantic Ocean	2	226.4	5	308	0.5× / 4.2
Exercises · Ionian Sea	2	79.5	2	122	1.7× / 1.2
Cable ops · South China Sea	2	79	3	68	1.4× / 1.4
Cable ops · Bay of Bengal	2	65.7	2	142	10× / 0.2
Incidents · Philippine Sea	2	47.2	0	—	0.4× / 4.8
Exercises · Tyrrhenian Sea	2	44.7	2	31	0.8× / 2.4
Cable ops · Laccadive Seanew	2	38.4	3	49	new / 0
Other · Yellow Sea	2	37.8	1	34	5.0× / 0.4
Incidents · Indian Ocean	2	34.7	1	71	0.5× / 4.2
Exercises · Indian Oceannew	2	30.9	1	29	new / 0
Nav aids · Tasman Sea	2	28.1	1	27	1.7× / 1.2
Cable ops · Irish Sea and St. George's Channel	2	18	0	—	0.6× / 3.2
Incidents · Laccadive Seanew	2	15.4	1	10	new / 0
Surveys · Tyrrhenian Sea	2	13.6	2	36	2.0× / 1
Other · North Atlantic Ocean	2	12.7	0	—	0.6× / 3.4
Nav aids · Mediterranean Sea - Western Basin	2	11.7	1	23	2.0× / 1
Cable ops · Mediterranean Sea - Western Basinnew	2	10.2	0	—	new / 0
Surveys · Black Sea	2	7.5	1	7	10× / 0.2
Quakes · Banda Sea	2	6	0	—	3.3× / 0.6
Icebergs · North Atlantic Ocean	2	3.7	0	—	2.0× / 1
Exercises · Bering Sea	2	3.1	0	—	5.0× / 0.4
Incidents · Great Australian Bight	2	3.1	0	—	2.5× / 0.8
Derelicts · Mediterranean Sea - Western Basin	2	2.4	1	2	10× / 0.2
Wrecks · Persian Gulf	1	84.7	2	74	1.3× / 0.8
Other · Japan Sea	1	61.1	1	34	0.8× / 1.2
Surveys · North Sealong running	1	45.4	1	490	0.3× / 4
Other · Black Sealong running	1	41.5	2	415	5.0× / 0.2
Nav aids · Laccadive Sea	1	41.5	2	364	1.3× / 0.8
Cable ops · North Atlantic Ocean	1	34.2	2	37	0.1× / 10.6
Exercises · Malacca Strait	1	33	1	34	2.5× / 0.4
Nav aids · Celtic Sea	1	32.6	2	233	0.4× / 2.4
Surveys · Persian Gulf	1	32.2	2	56	1.7× / 0.6
Nav aids · Ionian Sea	1	31.4	1	158	5.0× / 0.2
Nav aids · Southern Ocean	1	30	1	37	new / 0
Cable ops · Aegean Sea	1	28.8	1	48	new / 0
Surveys · Mediterranean Sea - Western Basin	1	26.7	0	—	1.7× / 0.6
Incidents · Celtic Sea	1	26.6	0	—	0.6× / 1.6
Surveys · Bay of Bengal	1	24.4	1	24	5.0× / 0.2
Cable ops · South Pacific Ocean	1	22.1	0	—	1.0× / 1
Incidents · Japan Sea	1	18.3	1	71	5.0× / 0.2
Cable ops · Celtic Sea	1	17.5	0	—	0.2× / 5.2
Incidents · Bay of Bengal	1	16.2	1	16	2.5× / 0.4
Exercises · South Atlantic Ocean	1	15.9	0	—	0.7× / 1.4
Cable ops · Gulf of Suez	1	14.6	1	14	5.0× / 0.2
Wrecks · Gulf of Mexico	1	12.6	1	32	new / 0
Towing · Black Sea	1	11.5	1	11	new / 0
Surveys · Eastern China Sea	1	10.5	1	10	2.5× / 0.4
Other · Mediterranean Sea - Eastern Basin	1	10.3	1	10	5.0× / 0.2
Cable ops · Eastern China Sea	1	8.5	1	8	0.8× / 1.2
Nav aids · Irish Sea and St. George's Channel	1	7.8	0	—	0.8× / 1.2
Containers · Mediterranean Sea - Eastern Basin	1	6.7	0	—	new / 0
Derelicts · Tyrrhenian Sea	1	6.7	0	—	2.5× / 0.4
Derelicts · Mediterranean Sea - Eastern Basin	1	6.5	0	—	1.0× / 1
Derelicts · Gulf of Mexico	1	6.3	0	—	1.7× / 0.6
Derelicts · Indian Ocean	1	6.2	0	—	1.7× / 0.6
Derelicts · North Atlantic Ocean	1	6.2	0	—	1.0× / 1
Derelicts · Celtic Sea	1	6	1	6	5.0× / 0.2
Exercises · Adriatic Sea	1	5.8	0	—	0.4× / 2.6
Cable ops · Persian Gulf	1	5.3	1	5	5.0× / 0.2
Incidents · Arafura Sea	1	4.5	1	4	2.5× / 0.4
Incidents · Caribbean Sea	1	4.3	1	4	new / 0
Spills · North Pacific Ocean	1	4	1	42	2.5× / 0.4
Quakes · Andaman or Burma Sea	1	3	0	—	new / 0
Quakes · Bali Sea	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.0× / 1
Quakes · Molukka Sea	1	3	0	—	2.5× / 0.4
Quakes · North Atlantic Ocean	1	3	0	—	2.5× / 0.4
Quakes · Norwegian Sea	1	3	0	—	new / 0
Exercises · Persian Gulf	1	3	0	—	5.0× / 0.2
Quakes · Savu Sea	1	3	0	—	new / 0
Quakes · South Atlantic Ocean	1	3	0	—	1.3× / 0.8
Quakes · Southern Ocean	1	3	0	—	2.5× / 0.4
Icebergs · South Atlantic Ocean	1	2.1	1	2	0.4× / 2.6
Other · Inner Seas off the West Coast of Scotland	1	1.9	0	—	2.5× / 0.4
Other · Laccadive Sea	1	1.4	0	—	new / 0
Incidents · Bay of Biscay	1	1.1	0	—	5.0× / 0.2
Nav aids · Great Australian Bight	1	1	0	—	5.0× / 0.2
Other · North Sea	1	0.8	0	—	0.5× / 2
Incidents · Tasman Sea	1	0.6	0	—	1.0× / 1
Incidents · Tyrrhenian Sea	1	0.5	1	0	new / 0
Cable ops · Tasman Sea	1	0.4	0	—	1.7× / 0.6
Wrecks · Bass Strait	1	0.3	1	0	new / 0
Volcanic · Philippine Sea	1	0.3	1	0	new / 0
Incidents · Timor Sea	1	0.2	0	—	1.3× / 0.8
Nav aids · Gulf of Mexico	1	0.1	0	—	0.8× / 1.2
Exercises · Aegean Sea	0	210	7	122	0.0× / 2
Surveys · Baffin Bay	0	150	5	211	— / 0
Wrecks · North Sealong running	0	120	4	476	— / 0
Surveys · Beaufort Sea	0	90	3	113	— / 0
Nav aids · Mozambique Channel	0	90	3	72	0.0× / 0.4
Other · Persian Gulflong running	0	90	3	451	0.0× / 1.4
Nav aids · Bay of Bengal	0	60	2	364	— / 0
Nav aids · Caribbean Sea	0	60	2	49	0.0× / 0.4
Nav aids · Persian Gulflong running	0	60	2	878	0.0× / 2.2
War risk · Persian Gulflong running	0	60	2	819	— / 0
Incidents · North Sea	0	46.5	1	59	0.0× / 0.2
Incidents · Andaman or Burma Sea	0	30	1	30	— / 0
Wrecks · Arabian Sea	0	30	1	65	— / 0
Surveys · Arctic Ocean	0	30	1	113	— / 0
Surveys · Balearic (Iberian Sea)	0	30	1	281	— / 0
Nav aids · English Channellong running	0	30	1	480	0.0× / 3.2
Wrecks · English Channellong running	0	30	1	925	0.0× / 0.2
Surveys · Greenland Sealong running	0	30	1	429	— / 0
Nav aids · Gulf of Suezlong running	0	30	1	386	0.0× / 0.6
Cable ops · Indian Ocean	0	30	1	54	0.0× / 0.6
Restricted · Indian Ocean	0	30	1	325	— / 0
Wrecks · Japan Sealong running	0	30	1	457	— / 0
Wrecks · Kattegatlong running	0	30	1	1,166	0.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basin	0	30	1	34	0.0× / 0.4
Cable ops · Philippine Sea	0	30	1	50	0.0× / 0.4
Nav aids · Red Sealong running	0	30	1	507	0.0× / 0.2
Nav aids · Savu Sealong running	0	30	1	787	— / 0
Wrecks · South Atlantic Ocean	0	30	1	128	0.0× / 0.4
Nav aids · South China Sea	0	30	1	317	0.0× / 0.2
Wrecks · Sulu Sea	0	30	1	294	— / 0
Wrecks · Baltic Sea	0	29	0	—	— / 0
Spills · North Atlantic Ocean	0	29	0	—	0.0× / 2
Other · Tasman Sea	0	26.5	0	—	0.0× / 0.2
Nav aids · Black Sea	0	20.4	0	—	— / 0
Surveys · Irish Sea and St. George's Channel	0	19.7	0	—	0.0× / 2
Nav aids · Indian Ocean	0	7.5	0	—	0.0× / 0.2
Other · Sea of Marmara	0	7	0	—	0.0× / 0.2
Cable ops · Gulf of Guinea	0	5.6	0	—	0.0× / 0.8
Other · Greenland Sea	0	2.6	0	—	— / 0
Wrecks · North Atlantic Ocean	0	2.6	0	—	— / 0
Wrecks · Skagerrak	0	2.6	0	—	— / 0
Icebergs · Southern Ocean	0	2	0	—	0.0× / 2
Other · Ionian Sea	0	1.5	0	—	0.0× / 0.4
Other · South Pacific Ocean	0	1	0	—	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2004-04, 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.