Sea Ledger, February 2024

2024-02-01 to 2024-02-29 · archive

issued: 594
warning-days in force: 13,584
in force at month end: 465
sea × type cells: 226

baseline: same month, previous 5 years (2023-02, 2022-02, 2021-02, 2020-02, 2019-02)

By type

type	issued	warning-days	in force at end
Exercises	140	1,081.7	39
Icebergs	85	84.8	4
Missiles	69	473.1	16
Incidents	66	885	29
Nav aids	65	4,811.9	163
Surveys	54	2,062.2	74
Cable ops	39	844.4	30
Other	17	634.7	19
Derelicts	15	82.7	5
Spills	15	266.4	6
Quakes	14	71.8	2
Debris	6	49.3	1
Piracy	4	16.7	0
Wrecks	3	1,503.5	53
Restricted	1	87.8	3
Containers	1	3	0
Mines	0	116	4
Structures	0	45.1	1
War risk	0	29	1
Volcanic	0	348	12
Ordnance	0	87	3

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Labrador Sea	29	33.6	2	30	1.0× / 28.2
Icebergs · Southern Ocean	29	26.9	1	29	1.1× / 27.4
Icebergs · South Atlantic Ocean	27	24.3	1	27	1.1× / 23.4
Missiles · North Atlantic Oceansurge	24	77.1	3	29	2.0× / 12
Exercises · Bay of Bengalsurge	21	142.4	3	35	2.3× / 9.2
Exercises · Arabian Seasurge	21	74.4	5	35	2.3× / 9
Exercises · North Pacific Ocean	20	211.5	9	64	1.0× / 20.8
Incidents · North Pacific Ocean	13	135.6	5	46	1.1× / 11.8
Surveys · South Atlantic Ocean	12	233.4	11	205	0.5× / 24
Missiles · Indian Oceansurge	12	84.7	4	35	2.0× / 6
Cable ops · Caribbean Seasurge	12	53.4	2	95	8.6× / 1.4
Exercises · Celtic Seasurge	12	11.6	0	—	3.5× / 3.4
Incidents · South China Sea	11	135.4	8	41	0.4× / 26.8
Nav aids · North Pacific Oceansurgelong running	9	283.8	8	694	2.3× / 4
Missiles · Barentsz Sea	9	62.4	3	24	1.9× / 4.8
Exercises · Philippine Sea	9	58.8	3	31	1.6× / 5.6
Exercises · Laccadive Seasurge	9	57.5	3	30	2.8× / 3.2
Surveys · Arabian Sea	8	373.5	11	122	0.9× / 9
Missiles · South Pacific Oceansurge	8	92.5	1	64	2.4× / 3.4
Exercises · South Atlantic Ocean	8	64	0	—	1.3× / 6
Nav aids · South Atlantic Ocean	7	1,153.3	37	327	0.8× / 8.2
Nav aids · North Atlantic Oceanlong running	7	389.4	12	1,050	1.5× / 4.6
Nav aids · South Pacific Oceansurgelong running	7	299.3	10	707	2.3× / 3
Incidents · North Atlantic Ocean	7	175.6	2	48	0.6× / 11.2
Exercises · South China Seasurge	7	42.3	5	15	12× / 0.6
Quakes · South Pacific Ocean	7	23.5	0	—	0.6× / 12
Exercises · Andaman or Burma Seasurge	7	17.2	0	—	2.3× / 3
Nav aids · North Sea	6	121.9	4	56	0.6× / 10.6
Cable ops · North Atlantic Ocean	6	95.6	6	61	1.6× / 3.8
Nav aids · Coral Seasurge	6	72.9	4	42	2.7× / 2.2
Exercises · North Atlantic Ocean	6	57.5	1	43	1.1× / 5.6
Nav aids · Caribbean Sealong running	5	956.6	35	1,108	1.6× / 3.2
Nav aids · Gulf of Mexicosurgelong running	5	319.5	11	1,063	3.6× / 1.4
Surveys · Indian Oceanlong running	5	108.2	4	370	1.3× / 4
Surveys · Gulf of Mexicosurge	5	94.8	4	211	5.0× / 1
Incidents · Mediterranean Sea - Eastern Basinsurge	5	66.1	3	44	3.1× / 1.6
Missiles · North Pacific Oceansurgelong running	5	58.8	3	366	2.1× / 2.4
Incidents · Coral Sea	5	19.9	2	26	1.1× / 4.6
Cable ops · Arabian Sea	4	163.5	6	51	1.7× / 2.4
Surveys · North Atlantic Ocean	4	145.8	5	57	0.5× / 7.8
Surveys · South Pacific Oceansurge	4	116	4	31	2.9× / 1.4
Spills · North Atlantic Oceansurgelong running	4	75	2	588	2.0× / 2
Other · North Pacific Ocean	4	55.1	1	43	1.8× / 2.2
Spills · North Pacific Ocean	3	73	0	—	0.8× / 3.6
Spills · Gulf of Mexico	3	56	1	42	0.8× / 3.6
Exercises · Caribbean Seasurge	3	52.7	1	160	2.1× / 1.4
Derelicts · North Atlantic Ocean	3	47	2	121	0.4× / 8.4
Cable ops · Andaman or Burma Seanew	3	41	1	28	new / 0
Incidents · South Pacific Ocean	3	38.3	1	44	0.4× / 7.4
Spills · Caribbean Seanew	3	34.4	2	17	new / 0
Cable ops · Gulf of Guineasurge	3	18.4	1	18	5.0× / 0.6
Exercises · Celebes Seanew	3	10.6	1	10	new / 0
Incidents · Bismarck Seasurge	3	10	1	18	2.5× / 1.2
Quakes · Philippine Sea	3	9	0	—	1.7× / 1.8
Incidents · Laccadive Sea	3	3.7	0	—	1.1× / 2.8
Exercises · Black Sealong running	2	73	2	708	0.1× / 13.4
Other · Bay of Biscaynewlong running	2	67.7	2	407	new / 0
Nav aids · Indian Ocean	2	67	3	190	1.0× / 2
Surveys · Laccadive Sealong running	2	65.8	2	747	2.5× / 0.8
Nav aids · English Channel	2	61.1	2	118	0.7× / 2.8
Cable ops · Philippine Sea	2	57	2	48	2.5× / 0.8
Incidents · South Atlantic Ocean	2	46.1	2	36	0.6× / 3.6
Surveys · Bay of Bengal	2	42.2	1	79	0.6× / 3.2
Other · Mediterranean Sea - Eastern Basin	2	39.6	1	27	5.0× / 0.4
Missiles · Philippine Sea	2	35.3	0	—	5.0× / 0.4
Surveys · Bass Strait	2	31.4	2	30	1.4× / 1.4
Incidents · Arabian Sea	2	30.2	1	39	0.7× / 2.8
Other · North Atlantic Ocean	2	29.5	0	—	1.0× / 2
Incidents · Gulf of Thailand	2	24.2	1	27	2.0× / 1
Surveys · North Pacific Oceannew	2	22.7	2	48	new / 0
Exercises · Barentsz Sea	2	21.2	1	35	1.1× / 1.8
Exercises · Sulu Sea	2	15.4	1	16	10× / 0.2
Exercises · Red Sea	2	14.8	0	—	1.4× / 1.4
Cable ops · North Pacific Ocean	2	13.6	0	—	2.5× / 0.8
Derelicts · Red Seanew	2	9.5	1	9	new / 0
Cable ops · Bass Straitnew	2	9.4	0	—	new / 0
Debris · North Atlantic Ocean	2	6	0	—	5.0× / 0.4
Piracy · Red Seanew	2	6	0	—	new / 0
Derelicts · Bay of Bengal	2	5.6	1	23	2.0× / 1
Missiles · South China Sea	2	5.5	0	—	10× / 0.2
Exercises · South Pacific Ocean	2	5.5	0	—	0.2× / 9.2
Missiles · Laccadive Sea	2	5.2	0	—	2.0× / 1
Exercises · Bay of Biscay	2	3.9	0	—	1.4× / 1.4
Derelicts · Arafura Sea	2	3.6	1	14	5.0× / 0.4
Nav aids · South China Sea	1	162.6	6	87	5.0× / 0.2
Wrecks · Persian Gulflong running	1	155.4	6	743	2.5× / 0.4
Other · Caribbean Sealong running	1	90.5	3	854	2.5× / 0.4
Nav aids · Bering Sealong running	1	82.4	3	433	1.0× / 1
Surveys · Arctic Ocean	1	63.9	3	127	new / 0
Other · South Atlantic Ocean	1	62.5	2	303	0.8× / 1.2
Other · Indian Ocean	1	61	2	44	2.5× / 0.4
Surveys · Caribbean Sea	1	60.3	0	—	0.5× / 2
Nav aids · Laccadive Sealong running	1	59.5	2	625	2.5× / 0.4
Surveys · Kara Sealong running	1	59	2	584	new / 0
Wrecks · South Atlantic Ocean	1	49.5	2	120	1.0× / 1
Incidents · Bay of Bengal	1	44.2	0	—	0.8× / 1.2
Nav aids · Inner Seas off the West Coast of Scotland	1	39.4	1	42	0.2× / 4.2
Cable ops · Java Sea	1	36.7	1	126	new / 0
Nav aids · Gulf of Alaska	1	33.3	1	71	0.6× / 1.6
Cable ops · South China Sea	1	33.2	2	33	1.0× / 1
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	30	1	354	1.3× / 0.8
Surveys · Mediterranean Sea - Western Basin	1	28.5	1	28	1.0× / 1
Cable ops · Sulu Sea	1	24.8	1	24	new / 0
Nav aids · Bay of Bengal	1	23.6	1	23	5.0× / 0.2
Wrecks · Irish Sea and St. George's Channel	1	21.6	1	21	5.0× / 0.2
Cable ops · Bay of Bengal	1	20.5	1	20	new / 0
Surveys · Gulf of Guinea	1	20.3	1	20	new / 0
Other · Great Australian Bight	1	19.3	0	—	1.3× / 0.8
Incidents · Java Sea	1	18.7	1	34	1.0× / 1
Incidents · Mediterranean Sea - Western Basin	1	15.3	0	—	new / 0
Spills · Bering Sea	1	14	0	—	1.3× / 0.8
Surveys · Tyrrhenian Sea	1	13.8	1	13	2.5× / 0.4
Surveys · Tasman Sea	1	13.4	1	13	1.0× / 1
Incidents · Tasman Sea	1	12.1	1	12	1.7× / 0.6
Incidents · Philippine Sea	1	11.5	0	—	0.4× / 2.4
Other · Ionian Sea	1	9.6	1	9	new / 0
Spills · Gulf of Aden	1	8	1	8	new / 0
Cable ops · Strait of Gibraltar	1	8	0	—	5.0× / 0.2
Other · Philippine Sea	1	7.3	1	7	5.0× / 0.2
Missiles · Black Sea	1	7.1	0	—	0.3× / 3.4
Surveys · Great Australian Bight	1	6.7	1	31	0.6× / 1.8
Incidents · Timor Sea	1	5.9	1	5	2.5× / 0.4
Debris · Indian Ocean	1	5.4	0	—	0.6× / 1.8
Missiles · Gulf of Oman	1	5.1	0	—	new / 0
Incidents · Halmahera Sea	1	4.9	0	—	new / 0
Missiles · Arabian Sea	1	4.7	0	—	5.0× / 0.2
Incidents · Indian Ocean	1	4.7	0	—	0.4× / 2.6
Missiles · Bay of Bengal	1	3.2	0	—	5.0× / 0.2
Derelicts · Arabian Sea	1	3	0	—	2.5× / 0.4
Derelicts · Caribbean Sea	1	3	0	—	0.6× / 1.6
Debris · Coral Sea	1	3	0	—	5.0× / 0.2
Exercises · Coral Sea	1	3	0	—	1.7× / 0.6
Other · Gulf of Aden	1	3	0	—	new / 0
Piracy · Gulf of Aden	1	3	0	—	new / 0
Quakes · Indian Ocean	1	3	0	—	0.4× / 2.4
Derelicts · Laccadive Sea	1	3	0	—	1.0× / 1
Debris · North Pacific Ocean	1	3	0	—	0.6× / 1.6
Quakes · North Pacific Ocean	1	3	0	—	0.5× / 2
Quakes · South Atlantic Ocean	1	3	0	—	0.5× / 2.2
Piracy · South China Sea	1	3	0	—	new / 0
Containers · South Pacific Ocean	1	3	0	—	new / 0
Derelicts · South Pacific Ocean	1	3	0	—	0.7× / 1.4
Derelicts · Tasman Sea	1	3	0	—	1.7× / 0.6
Debris · Caribbean Sea	1	2.9	0	—	5.0× / 0.2
Missiles · Norwegian Sea	1	2.5	1	2	5.0× / 0.2
Derelicts · South Atlantic Ocean	1	2	0	—	0.5× / 2
Nav aids · Japan Sea	1	1.5	0	—	new / 0
Quakes · Bering Sea	1	1.3	1	1	new / 0
Restricted · South Atlantic Ocean	1	0.8	0	—	2.5× / 0.4
Exercises · Baltic Sea	1	0.4	1	0	2.5× / 0.4
Nav aids · Kattegat	1	0.3	0	—	5.0× / 0.2
Incidents · Solomon Sea	1	0.2	0	—	0.8× / 1.2
Incidents · Arafura Sea	1	0	0	—	1.3× / 0.8
Volcanic · Philippine Sealong running	0	290	10	1,168	0.0× / 0.2
Surveys · The Northwestern Passageslong running	0	203	7	559	— / 0
Surveys · Persian Gulflong running	0	197.2	6	559	0.0× / 6
Wrecks · Arabian Sea	0	174	6	289	0.0× / 0.4
Wrecks · The Northwestern Passageslong running	0	174	6	910	— / 0
Cable ops · Persian Gulf	0	168.2	5	344	0.0× / 0.8
Mines · Black Sealong running	0	116	4	735	0.0× / 0.4
Wrecks · Caribbean Sea	0	116	4	354	0.0× / 0.4
Wrecks · North Atlantic Ocean	0	116	4	134	0.0× / 0.2
Nav aids · Celtic Sea	0	89.7	3	171	0.0× / 1.4
Wrecks · South Pacific Ocean	0	88	3	332	0.0× / 0.4
Exercises · Aegean Sea	0	87	3	56	0.0× / 9.2
Ordnance · Bay of Biscay	0	87	3	255	— / 0
Nav aids · Beaufort Sealong running	0	87	3	567	— / 0
Wrecks · Hudson Baylong running	0	87	3	489	— / 0
Wrecks · South China Sealong running	0	87	3	1,820	0.0× / 0.8
Nav aids · Arabian Sealong running	0	58	2	855	0.0× / 1.4
Wrecks · Bay of Bengal	0	58	2	218	0.0× / 0.2
Nav aids · Bay of Biscaylong running	0	58	2	580	— / 0
Surveys · Chukchi Sea	0	58	2	204	— / 0
Wrecks · Coral Sealong running	0	58	2	608	— / 0
Nav aids · Hudson Strait	0	58	2	230	— / 0
Restricted · Indian Ocean	0	58	2	330	— / 0
Wrecks · Kara Sea	0	58	2	135	0.0× / 0.4
Wrecks · Laccadive Sealong running	0	58	2	377	0.0× / 0.4
Volcanic · North Pacific Ocean	0	58	2	59	— / 0
Nav aids · Persian Gulflong running	0	58	2	646	— / 0
Other · Persian Gulflong running	0	58	2	378	0.0× / 0.4
Exercises · Japan Sea	0	57	0	—	0.0× / 3
Cable ops · South Atlantic Ocean	0	55.1	1	64	0.0× / 0.6
Incidents · Gulf of Mexico	0	46.9	0	—	0.0× / 1
Surveys · Mediterranean Sea - Eastern Basin	0	46.3	1	71	0.0× / 1.2
Nav aids · Andaman or Burma Sea	0	37.4	1	297	0.0× / 0.2
Missiles · Aegean Sea	0	29	1	44	— / 0
Other · Arafura Sea	0	29	1	198	— / 0
Wrecks · Arafura Sea	0	29	1	49	— / 0
Nav aids · Arctic Ocean	0	29	1	139	— / 0
Other · Bay of Bengal	0	29	1	208	0.0× / 0.2
Debris · Bay of Biscaylong running	0	29	1	540	— / 0
Surveys · Beaufort Sea	0	29	1	204	— / 0
Other · Black Sea	0	29	1	347	— / 0
War risk · Black Sealong running	0	29	1	709	— / 0
Quakes · Coral Sea	0	29	1	99	0.0× / 1.6
Wrecks · Eastern China Sea	0	29	1	216	— / 0
Other · English Channellong running	0	29	1	402	0.0× / 1
Wrecks · Great Australian Bight	0	29	1	41	— / 0
Nav aids · Gulf of Californialong running	0	29	1	685	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2024-02, 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.