Sea Ledger, March 2024

2024-03-01 to 2024-03-31 · archive

issued: 731
warning-days in force: 15,574
in force at month end: 519
sea × type cells: 246

baseline: same month, previous 5 years (2023-03, 2022-03, 2021-03, 2020-03, 2019-03)

By type

type	issued	warning-days	in force at end
Exercises	176	1,621.9	57
Incidents	106	1,181.9	38
Icebergs	97	106.1	4
Missiles	75	518.3	11
Nav aids	65	5,184.3	163
Surveys	48	2,437.9	82
Cable ops	38	1,031.6	42
Quakes	31	118.1	6
Towing	25	27.7	2
Derelicts	21	146.1	6
Spills	14	255	10
Other	9	506.3	19
Piracy	8	21.5	0
Wrecks	6	1,628	53
Debris	6	44.8	3
Containers	3	6.1	0
Mines	2	130	4
Restricted	1	81.5	2
War risk	0	31	1
Structures	0	31	1
Volcanic	0	372	12
Ordnance	0	93	3

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Southern Ocean	33	32.9	1	31	0.9× / 35
Exercises · North Pacific Ocean	32	370.3	18	66	1.0× / 33
Icebergs · Labrador Sea	32	39.4	2	32	1.3× / 25.4
Icebergs · South Atlantic Ocean	31	30.8	1	31	1.4× / 22.4
Towing · North Pacific Oceansurge	25	27.7	2	24	3.8× / 6.6
Exercises · Bay of Bengalsurge	23	192.1	2	34	2.4× / 9.6
Missiles · North Atlantic Ocean	23	94.9	0	—	2.0× / 11.6
Incidents · North Atlantic Oceansurge	22	208.6	12	41	2.3× / 9.4
Missiles · Indian Oceansurge	20	107.9	2	37	3.0× / 6.6
Incidents · South China Sea	15	217.6	2	50	0.6× / 23.8
Cable ops · North Atlantic Oceansurge	14	229.9	7	92	2.8× / 5
Exercises · South China Seasurge	14	149.7	5	39	23× / 0.6
Nav aids · North Atlantic Oceansurgelong running	13	443.7	14	1,081	2.6× / 5
Nav aids · North Pacific Oceansurgelong running	12	292.8	9	725	3.2× / 3.8
Exercises · Laccadive Seasurge	11	62.9	2	34	3.7× / 3
Incidents · Mediterranean Sea - Eastern Basinsurge	10	134.6	3	42	7.1× / 1.4
Exercises · Philippine Sea	10	69.8	2	39	1.4× / 7
Quakes · South Pacific Ocean	10	27.5	1	29	0.5× / 22
Incidents · North Pacific Ocean	9	117.2	0	—	1.2× / 7.4
Exercises · Gulf of Mexicosurge	9	102.9	9	11	2.3× / 4
Exercises · Arabian Sea	8	109.6	3	34	0.6× / 13.2
Incidents · South Atlantic Ocean	8	86.9	5	48	1.4× / 5.6
Exercises · South Pacific Ocean	8	22.1	2	25	0.7× / 11.6
Exercises · Celtic Sea	8	12.4	0	—	1.2× / 6.8
Exercises · Bay of Biscay	8	8.1	0	—	1.9× / 4.2
Surveys · South Atlantic Ocean	7	306.5	9	236	0.4× / 19.4
Surveys · Arabian Sea	6	348.4	12	107	0.6× / 10.6
Surveys · Bay of Bengalsurge	6	99.9	3	39	2.3× / 2.6
Exercises · Black Sealong running	6	91.6	3	739	0.4× / 15.2
Missiles · South Pacific Ocean	6	83.9	2	35	1.5× / 4
Incidents · Arabian Sea	6	60	2	35	1.4× / 4.2
Exercises · South Atlantic Ocean	6	30.2	0	—	0.8× / 7.8
Nav aids · Gulf of Mexicosurgelong running	5	341.8	11	1,094	2.8× / 1.8
Surveys · North Atlantic Ocean	5	206.7	10	88	0.9× / 5.6
Exercises · Barentsz Seasurge	5	47.4	0	—	2.5× / 2
Incidents · Bay of Bengalsurge	5	27.1	2	27	2.8× / 1.8
Cable ops · Celtic Seasurge	5	19.7	3	10	8.3× / 0.6
Derelicts · Arafura Seasurge	5	13.4	0	—	13× / 0.4
Piracy · Indian Oceannew	5	12.5	0	—	new / 0
Nav aids · Coral Sea	4	108.6	2	47	0.6× / 6.6
Spills · North Atlantic Oceanlong running	4	73	4	619	1.4× / 2.8
Exercises · Caribbean Sea	4	68	4	191	0.8× / 5
Missiles · North Pacific Oceanlong running	4	66.1	2	397	1.3× / 3.2
Missiles · Barentsz Sea	4	53.1	1	38	1.1× / 3.8
Spills · Gulf of Mexico	4	51	2	41	1.3× / 3
Nav aids · Gulf of Alaskasurge	4	41.2	2	102	5.0× / 0.8
Exercises · North Atlantic Ocean	4	33.4	0	—	0.6× / 6.6
Incidents · Gulf of Mexico	4	32.7	1	24	1.7× / 2.4
Incidents · Indian Ocean	4	21	1	18	0.6× / 6.4
Surveys · Great Australian Bightsurge	4	20.1	0	—	2.2× / 1.8
Exercises · Sulu Seasurge	4	18.9	0	—	5.0× / 0.8
Quakes · North Pacific Ocean	4	12	0	—	0.7× / 6
Nav aids · South Atlantic Ocean	3	1,067.4	33	358	0.3× / 11.2
Cable ops · Arabian Sea	3	198.1	7	82	0.8× / 4
Surveys · Indian Oceanlong running	3	132.7	5	401	1.0× / 3
Nav aids · Celtic Seasurge	3	115.2	4	202	2.1× / 1.4
Nav aids · Indian Oceansurge	3	107.2	3	221	2.5× / 1.2
Surveys · Gulf of Mexiconew	3	84.5	3	242	new / 0
Surveys · Timor Seanew	3	66.9	2	81	new / 0
Cable ops · Sulu Seanew	3	61.7	3	55	new / 0
Cable ops · North Pacific Ocean	3	50.4	3	20	1.0× / 3
Derelicts · North Atlantic Ocean	3	47.7	1	152	1.0× / 3
Exercises · Gulf of California	3	34	3	11	1.9× / 1.6
Spills · North Pacific Ocean	3	32	1	24	1.3× / 2.4
Exercises · Andaman or Burma Sea	3	27.8	0	—	0.6× / 5
Incidents · Coral Sea	3	25.4	0	—	0.7× / 4.2
Cable ops · Indian Oceansurge	3	16.3	3	9	7.5× / 0.4
Surveys · Caribbean Sea	3	12.3	1	11	1.5× / 2
Missiles · Philippine Seasurge	3	12.3	0	—	15× / 0.2
Missiles · South Atlantic Ocean	3	12.3	1	9	1.9× / 1.6
Containers · Bay of Biscaysurge	3	6.1	0	—	15× / 0.2
Nav aids · Caribbean Sealong running	2	1,111.7	36	1,139	1.1× / 1.8
Nav aids · South Pacific Oceanlong running	2	312.9	10	738	0.4× / 4.6
Nav aids · South China Sea	2	164.4	6	118	10× / 0.2
Mines · Black Seanewlong running	2	130	4	766	new / 0
Nav aids · North Sea	2	113.6	2	73	0.2× / 8.6
Nav aids · English Channel	2	89.9	3	149	1.0× / 2
Surveys · Laccadive Sealong running	2	76	3	778	10× / 0.2
Surveys · North Pacific Ocean	2	62.3	1	44	3.3× / 0.6
Cable ops · South China Sea	2	54.5	3	63	1.4× / 1.4
Other · Bay of Bengal	2	36.3	1	239	10× / 0.2
Wrecks · Irish Sea and St. George's Channelnew	2	32.1	1	52	new / 0
Incidents · South Pacific Ocean	2	31.5	1	35	0.3× / 6.8
Nav aids · Tasman Sea	2	23.8	0	—	5.0× / 0.4
Exercises · Japan Sea	2	22.6	1	20	1.1× / 1.8
Incidents · Tyrrhenian Seanew	2	21.4	2	15	new / 0
Incidents · Mediterranean Sea - Western Basin	2	19.6	2	16	3.3× / 0.6
Exercises · Tasman Sea	2	18.3	0	—	10× / 0.2
Cable ops · Gulf of Guinea	2	18.1	1	32	3.3× / 0.6
Missiles · East Siberian Seanew	2	16.7	1	15	new / 0
Derelicts · Arabian Seanew	2	16.2	1	15	new / 0
Exercises · Indian Ocean	2	13.5	0	—	1.4× / 1.4
Incidents · Solomon Sea	2	10.8	0	—	10× / 0.2
Missiles · Black Sea	2	8	0	—	0.6× / 3.2
Piracy · Arabian Seanew	2	6	0	—	new / 0
Derelicts · Gulf of Adennew	2	6	0	—	new / 0
Debris · Indian Ocean	2	6	0	—	1.0× / 2
Quakes · Java Seanew	2	6	0	—	new / 0
Quakes · North Atlantic Ocean	2	6	0	—	1.3× / 1.6
Quakes · Philippine Sea	2	6	0	—	0.9× / 2.2
Missiles · Bay of Bengal	2	5.8	0	—	5.0× / 0.4
Other · North Atlantic Ocean	2	5.7	1	11	0.3× / 7.6
Quakes · Bismarck Sea	2	5.6	1	8	2.0× / 1
Debris · Caribbean Seanew	2	4.2	1	6	new / 0
Wrecks · Arabian Sea	1	194.1	7	320	5.0× / 0.2
Surveys · Persian Gulflong running	1	189.6	6	590	0.2× / 6.4
Wrecks · South China Sealong running	1	93.3	3	1,851	1.7× / 0.6
Surveys · Bass Strait	1	78.9	2	54	0.8× / 1.2
Wrecks · South Pacific Ocean	1	73.2	3	363	1.7× / 0.6
Nav aids · Bay of Biscaylong running	1	62.8	3	611	new / 0
Other · Indian Ocean	1	62.2	2	75	1.0× / 1
Wrecks · South Atlantic Ocean	1	62	2	151	1.7× / 0.6
Restricted · Indian Ocean	1	50.5	1	361	new / 0
Cable ops · Caribbean Sea	1	36.7	2	55	new / 0
Nav aids · Inner Seas off the West Coast of Scotland	1	33.9	1	73	0.3× / 4
Surveys · Gulf of Guinea	1	33.4	1	51	2.5× / 0.4
Other · North Pacific Ocean	1	33.3	2	71	1.3× / 0.8
Nav aids · Bay of Bengal	1	32.1	1	54	1.7× / 0.6
Incidents · Java Sea	1	32.1	0	—	0.6× / 1.6
Nav aids · Irish Sea and St. George's Channel	1	31.9	1	112	0.7× / 1.4
Incidents · Gulf of Thailand	1	30.8	0	—	0.6× / 1.6
Derelicts · Red Sea	1	28.2	1	35	5.0× / 0.2
Cable ops · Philippine Sea	1	27.5	1	48	1.3× / 0.8
Incidents · Caribbean Sea	1	18.7	0	—	0.6× / 1.8
Incidents · Flores Sea	1	16.8	0	—	new / 0
Derelicts · Bay of Bengal	1	16.6	0	—	1.7× / 0.6
Incidents · Laccadive Sea	1	14.7	1	14	0.6× / 1.8
Spills · Beaufort Sea	1	14	0	—	5.0× / 0.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	0.8× / 1.2
Incidents · Gulf of California	1	12.7	1	12	new / 0
Missiles · Japan Sea	1	11.9	0	—	0.3× / 3.2
Cable ops · Gulf of St. Lawrence	1	9.7	0	—	new / 0
Incidents · Philippine Sea	1	7.9	1	7	0.4× / 2.8
Nav aids · Mediterranean Sea - Western Basin	1	7.1	0	—	1.7× / 0.6
Surveys · Sulu Sea	1	6.7	1	6	new / 0
Incidents · Bismarck Sea	1	5.4	0	—	0.6× / 1.8
Incidents · Singapore Strait	1	5.3	1	5	new / 0
Missiles · Gulf of Mexico	1	5.1	0	—	5.0× / 0.2
Exercises · Coral Sea	1	4.8	0	—	0.8× / 1.2
Missiles · Kara Sea	1	3.6	1	3	new / 0
Derelicts · Mozambique Channel	1	3.3	1	3	1.0× / 1
Quakes · Arabian Sea	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	1	32	new / 0
Other · Celtic Sea	1	3	0	—	new / 0
Derelicts · English Channel	1	3	0	—	5.0× / 0.2
Piracy · Gulf of Aden	1	3	0	—	new / 0
Spills · Gulf of Alaska	1	3	1	3	5.0× / 0.2
Derelicts · Gulf of Mexico	1	3	0	—	1.7× / 0.6
Quakes · Indian Ocean	1	3	0	—	0.4× / 2.8
Debris · Irish Sea and St. George's Channel	1	3	0	—	new / 0
Icebergs · Kara Sea	1	3	0	—	5.0× / 0.2
Quakes · Molukka Sea	1	3	0	—	5.0× / 0.2
Derelicts · North Sea	1	3	0	—	2.5× / 0.4
Missiles · Red Sea	1	3	0	—	new / 0
Quakes · Savu Sea	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	0.6× / 1.6
Quakes · South Atlantic Ocean	1	3	0	—	0.7× / 1.4
Derelicts · South Pacific Ocean	1	3	0	—	0.5× / 2.2
Other · Mediterranean Sea - Eastern Basin	1	2.8	1	48	2.5× / 0.4
Quakes · Ionian Sea	1	2.7	1	2	5.0× / 0.2
Exercises · Red Sea	1	2.7	0	—	0.7× / 1.4
Derelicts · Indian Ocean	1	2.5	1	2	0.6× / 1.6
Missiles · Laccadive Sea	1	1.8	0	—	1.3× / 0.8
Exercises · Mozambique Channel	1	1.7	0	—	new / 0
Exercises · Bering Sea	1	0.7	0	—	5.0× / 0.2
Incidents · Great Australian Bight	1	0.6	0	—	2.5× / 0.4
Debris · Philippine Sea	1	0.6	1	0	new / 0
Other · Kara Sea	1	0.4	1	0	new / 0
Quakes · Southern Ocean	1	0.3	1	0	2.5× / 0.4
Nav aids · Strait of Gibraltar	1	0.3	0	—	2.5× / 0.4
Derelicts · Bay of Biscay	1	0.2	1	0	new / 0
Missiles · Java Sea	1	0.2	0	—	new / 0
Incidents · Arafura Sea	1	0.1	0	—	1.3× / 0.8
Incidents · Bali Sea	1	0	1	0	new / 0
Volcanic · Philippine Sealong running	0	310	10	1,199	0.0× / 0.2
Surveys · The Northwestern Passageslong running	0	217	7	590	— / 0
Wrecks · Persian Gulflong running	0	186	6	774	0.0× / 1.6
Wrecks · The Northwestern Passageslong running	0	186	6	941	— / 0
Cable ops · Persian Gulflong running	0	155	5	375	0.0× / 0.8
Wrecks · Caribbean Sealong running	0	124	4	385	0.0× / 0.6
Wrecks · North Atlantic Ocean	0	124	4	165	0.0× / 0.2
Surveys · South Pacific Ocean	0	124	4	51	0.0× / 1.4
Exercises · Aegean Sea	0	93	3	87	0.0× / 16.2
Surveys · Arctic Ocean	0	93	3	158	— / 0
Ordnance · Bay of Biscay	0	93	3	286	— / 0
Nav aids · Beaufort Sealong running	0	93	3	598	— / 0
Nav aids · Bering Sealong running	0	93	3	464	— / 0
Other · Caribbean Sealong running	0	93	3	885	0.0× / 1
Wrecks · Hudson Baylong running	0	93	3	520	— / 0
Nav aids · Arabian Sealong running	0	62	2	886	0.0× / 0.4
Wrecks · Bay of Bengal	0	62	2	249	0.0× / 0.2
Other · Bay of Biscaylong running	0	62	2	438	0.0× / 0.2
Spills · Caribbean Sea	0	62	2	45	— / 0
Surveys · Chukchi Sea	0	62	2	235	— / 0
Wrecks · Coral Sealong running	0	62	2	639	— / 0
Nav aids · Hudson Strait	0	62	2	261	— / 0
Surveys · Kara Sealong running	0	62	2	615	— / 0
Wrecks · Kara Sea	0	62	2	166	— / 0
Nav aids · Laccadive Sea	0	62	2	290	0.0× / 0.8
Wrecks · Laccadive Sealong running	0	62	2	408	0.0× / 0.6

Cite: seahazards.com Sea Ledger, 2024-03, 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.