Sea Ledger, January 2024

2024-01-01 to 2024-01-31 · archive

issued: 667
warning-days in force: 14,266
in force at month end: 479
sea × type cells: 217

baseline: same month, previous 5 years (2023-01, 2022-01, 2021-01, 2020-01, 2019-01)

By type

type	issued	warning-days	in force at end
Exercises	142	987	43
Incidents	114	1,055.4	43
Icebergs	93	95.8	3
Surveys	66	2,287.5	73
Nav aids	56	5,121.9	161
Missiles	49	373.5	12
Cable ops	43	932.8	31
Quakes	29	112.4	2
Derelicts	22	131.6	1
Spills	16	233	10
Other	13	537.5	20
Piracy	11	29.5	2
Wrecks	7	1,564.7	51
Volcanic	2	379.9	12
Mines	1	124.2	4
Restricted	1	66.9	3
Debris	1	33	2
Containers	1	3	0
Structures	0	72.7	2
War risk	0	31	1
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 · Labrador Sea	31	36.4	2	32	1.0× / 31.6
Icebergs · Southern Ocean	31	30.9	1	31	1.2× / 26
Icebergs · South Atlantic Ocean	31	28.5	0	—	1.0× / 30
Incidents · North Atlantic Oceansurge	27	279	13	43	2.1× / 13
Exercises · Bay of Bengalsurge	27	142.8	5	33	2.5× / 11
Incidents · South China Sea	21	199.2	5	40	0.8× / 25.6
Exercises · North Pacific Ocean	19	252.7	13	66	0.9× / 20.6
Exercises · Arabian Sea	17	88.8	3	35	1.3× / 13.6
Exercises · Celtic Seasurge	13	15.1	1	27	5.9× / 2.2
Surveys · South Pacific Oceansurge	12	124	4	34	7.5× / 1.6
Exercises · Laccadive Seasurge	12	69.4	2	33	3.0× / 4
Surveys · South Atlantic Ocean	11	315.2	7	251	0.7× / 16.8
Missiles · Indian Ocean	11	54.4	3	28	1.6× / 7
Missiles · North Atlantic Ocean	11	37.6	1	32	0.8× / 13
Missiles · South Pacific Ocean	10	144	3	36	1.7× / 5.8
Incidents · North Pacific Ocean	10	64	4	44	0.9× / 11.4
Surveys · Indian Oceansurge	9	230.5	4	341	2.5× / 3.6
Exercises · North Atlantic Ocean	9	44.2	4	157	1.4× / 6.6
Quakes · Japan Seasurge	9	21.4	0	—	45× / 0.2
Surveys · Arabian Sea	8	391.3	13	97	1.0× / 7.8
Nav aids · North Sea	8	121.3	4	61	1.0× / 8.2
Cable ops · Caribbean Seasurge	8	48	2	66	13× / 0.6
Cable ops · Arabian Seasurge	7	137.4	6	139	3.2× / 2.2
Surveys · North Atlantic Oceanlong running	7	92.8	7	395	1.1× / 6.2
Exercises · Philippine Seasurge	7	37	2	27	5.8× / 1.2
Incidents · Bay of Bengalsurge	7	17.9	3	12	3.5× / 2
Nav aids · South Pacific Oceanlong running	6	243.5	9	678	1.7× / 3.6
Cable ops · North Atlantic Ocean	6	215.1	6	111	1.1× / 5.2
Incidents · South Pacific Ocean	6	83.6	3	42	0.9× / 6.8
Exercises · South Atlantic Ocean	6	76.2	1	71	0.6× / 9.8
Missiles · North Pacific Ocean	6	75.7	2	337	1.4× / 4.4
Incidents · South Atlantic Ocean	6	68	2	32	1.5× / 4
Spills · Gulf of Mexicosurge	6	66	4	28	2.0× / 3
Spills · North Pacific Oceansurge	6	53	4	22	5.0× / 1.2
Exercises · Andaman or Burma Seasurge	6	27	0	—	2.3× / 2.6
Incidents · Indian Ocean	6	24.6	1	26	1.4× / 4.2
Quakes · South Pacific Ocean	6	16.7	1	32	0.7× / 9
Nav aids · Gulf of Mexicosurgelong running	5	291.4	10	1,034	2.5× / 2
Nav aids · Coral Sea	5	182.7	2	283	1.7× / 3
Derelicts · Mozambique Channelsurge	5	15	0	—	8.3× / 0.6
Piracy · Indian Oceannew	5	12.2	0	—	new / 0
Incidents · Coral Sea	5	12	0	—	1.3× / 3.8
Nav aids · North Atlantic Oceanlong running	4	400.7	14	1,021	0.3× / 11.4
Nav aids · North Pacific Oceanlong running	4	279.1	9	665	0.9× / 4.2
Surveys · Gulf of Mexicosurge	4	93	3	182	10× / 0.4
Cable ops · South Atlantic Oceansurge	4	83.6	2	222	5.0× / 0.8
Exercises · Aegean Sealong running	4	58.6	3	394	0.3× / 15.2
Incidents · Gulf of Mexicosurge	4	57.6	3	42	2.2× / 1.8
Other · North Pacific Oceansurge	4	36.4	3	14	2.0× / 2
Missiles · South China Seanew	4	12.7	1	19	new / 0
Nav aids · South Atlantic Oceanlong running	3	1,252.1	39	537	0.4× / 8.4
Surveys · Persian Gulflong running	3	189.6	7	530	0.5× / 6.6
Surveys · Laccadive Seasurgelong running	3	69.7	2	718	3.0× / 1
Spills · The Coastal Waters of Southeast Alaska and British Columbiasurge	3	47	1	45	7.5× / 0.4
Cable ops · Gulf of Mexiconew	3	45.6	1	30	new / 0
Derelicts · North Atlantic Ocean	3	40.5	1	92	0.4× / 7.4
Surveys · Bass Straitsurge	3	34.2	1	300	3.8× / 0.8
Incidents · Caribbean Sea	3	27.1	2	28	1.1× / 2.6
Nav aids · Inner Seas off the West Coast of Scotland	3	24.9	1	24	0.9× / 3.2
Exercises · Barentsz Sea	3	23.9	1	18	1.3× / 2.4
Cable ops · Strait of Gibraltarnew	3	17.1	0	—	new / 0
Derelicts · South Pacific Oceansurge	3	9.8	0	—	2.5× / 1.2
Derelicts · English Channelsurge	3	9	0	—	15× / 0.2
Piracy · Gulf of Adennew	3	9	0	—	new / 0
Quakes · Philippine Sea	3	9	0	—	1.9× / 1.6
Exercises · Red Seasurge	3	6.7	2	26	3.0× / 1
Incidents · Bismarck Sea	3	6.4	0	—	0.9× / 3.2
Exercises · Bay of Biscay	3	4.5	0	—	1.4× / 2.2
Cable ops · Persian Gulf	2	179.3	6	315	1.7× / 1.2
Wrecks · Persian Gulflong running	2	140.3	5	714	2.0× / 1
Nav aids · English Channel	2	100	2	89	2.0× / 1
Nav aids · Indian Ocean	2	98.6	2	161	0.9× / 2.2
Nav aids · Celtic Sea	2	77.6	4	142	1.3× / 1.6
Exercises · Black Sealong running	2	72	2	679	0.2× / 10.4
Surveys · Caribbean Sea	2	63.4	2	151	1.4× / 1.4
Incidents · Arabian Sea	2	53.5	1	37	0.3× / 6.2
Incidents · Mediterranean Sea - Eastern Basin	2	50	1	34	0.7× / 2.8
Volcanic · North Pacific Ocean	2	48	2	30	10× / 0.2
Quakes · Coral Sea	2	37	1	70	0.8× / 2.4
Cable ops · Indian Ocean	2	36.6	1	24	2.5× / 0.8
Incidents · Laccadive Sea	2	33	0	—	0.4× / 5.2
Cable ops · North Pacific Ocean	2	29.9	2	23	1.7× / 1.2
Other · Indian Ocean	2	28.5	2	36	5.0× / 0.4
Derelicts · Laccadive Sea	2	23.4	0	—	1.7× / 1.2
Missiles · Aegean Sealong running	2	15.6	1	394	3.3× / 0.6
Wrecks · Great Australian Bightnew	2	15.1	1	15	new / 0
Nav aids · Tasman Sea	2	13.5	1	13	3.3× / 0.6
Exercises · South Pacific Ocean	2	8.5	0	—	0.4× / 5.4
Cable ops · South China Sea	2	8.4	2	4	5.0× / 0.4
Incidents · Java Sea	2	7.6	1	9	0.6× / 3.2
Quakes · Indian Ocean	2	7.3	0	—	1.1× / 1.8
Exercises · Mozambique Channel	2	6.3	0	—	10× / 0.2
Derelicts · Caribbean Sea	2	6	0	—	0.6× / 3.6
Quakes · North Pacific Ocean	2	6	0	—	0.4× / 5
Quakes · South Atlantic Ocean	2	6	0	—	1.3× / 1.6
Other · South Pacific Ocean	2	6	0	—	10× / 0.2
Quakes · Southern Ocean	2	6	0	—	1.7× / 1.2
Piracy · Arabian Seanew	2	5.3	2	4	new / 0
Derelicts · Black Sea	2	4.7	0	—	10× / 0.2
Exercises · Indian Ocean	2	4.4	0	—	1.1× / 1.8
Other · North Atlantic Ocean	2	2.5	1	14	1.1× / 1.8
Exercises · Japan Sea	2	0.9	2	0	1.4× / 1.4
Nav aids · Caribbean Sealong running	1	957.5	31	1,079	0.4× / 2.4
Nav aids · South China Sea	1	144.3	5	58	new / 0
Wrecks · South Pacific Ocean	1	98.1	4	303	5.0× / 0.2
Other · Bay of Biscaylong running	1	64.7	2	378	5.0× / 0.2
Surveys · Bay of Bengal	1	63	3	50	0.4× / 2.8
Other · English Channellong running	1	46.1	1	373	5.0× / 0.2
Wrecks · Arafura Sea	1	44.7	1	275	new / 0
Exercises · Caribbean Sea	1	40	2	131	0.7× / 1.4
Nav aids · Andaman or Burma Sea	1	39.6	2	268	2.5× / 0.4
Restricted · Indian Ocean	1	35.9	2	301	new / 0
Nav aids · Gulf of Alaska	1	32.3	1	42	0.7× / 1.4
Nav aids · Irish Sea and St. George's Channel	1	31.2	1	52	0.8× / 1.2
Nav aids · Bass Strait	1	28.7	0	—	1.0× / 1
Nav aids · Great Australian Bight	1	26.8	0	—	0.8× / 1.2
Missiles · Philippine Sea	1	25.5	1	25	0.6× / 1.6
Surveys · Timor Sea	1	21.9	1	21	5.0× / 0.2
Nav aids · Timor Sea	1	20.9	0	—	new / 0
Cable ops · Tasman Sea	1	20.8	0	—	5.0× / 0.2
Cable ops · Philippine Sea	1	19.5	1	19	0.6× / 1.6
Surveys · North Pacific Ocean	1	19.3	1	19	2.5× / 0.4
Incidents · Philippine Sea	1	19.1	1	19	0.4× / 2.8
Derelicts · Arabian Sea	1	18.5	0	—	0.5× / 2.2
Incidents · Alboran Sea	1	16.2	0	—	new / 0
Spills · Beaufort Sea	1	14	0	—	new / 0
Wrecks · Gulf of Suez	1	12.2	1	12	new / 0
Incidents · Bali Sea	1	11.9	1	42	new / 0
Cable ops · Bay of Bengal	1	10.5	0	—	5.0× / 0.2
Incidents · Mozambique Channel	1	10.1	1	10	2.5× / 0.4
Incidents · Molukka Sea	1	9.6	1	9	2.5× / 0.4
Cable ops · Singapore Strait	1	7.5	0	—	new / 0
Exercises · Coral Sea	1	4.1	0	—	1.7× / 0.6
Exercises · Baltic Sea	1	3.9	0	—	5.0× / 0.2
Nav aids · Japan Sea	1	3.5	0	—	new / 0
Piracy · Bismarck Sea	1	3	0	—	new / 0
Quakes · Flores Sea	1	3	0	—	5.0× / 0.2
Missiles · Gulf of Aden	1	3	0	—	new / 0
Containers · North Atlantic Ocean	1	3	0	—	2.5× / 0.4
Missiles · Red Sea	1	3	0	—	new / 0
Derelicts · South Atlantic Ocean	1	3	0	—	1.0× / 1
Surveys · Great Australian Bight	1	2	1	2	2.5× / 0.4
Debris · Indian Ocean	1	2	1	32	0.8× / 1.2
Missiles · Laccadive Sea	1	1.9	0	—	1.0× / 1
Other · Gulf of Mexico	1	0.5	1	0	0.6× / 1.6
Incidents · Arafura Sea	1	0.3	0	—	0.8× / 1.2
Nav aids · Baltic Sea	1	0.3	0	—	new / 0
Mines · South Atlantic Ocean	1	0.2	0	—	new / 0
Incidents · Banda Sea	1	0.1	0	—	1.7× / 0.6
Missiles · South Atlantic Ocean	1	0.1	0	—	0.2× / 4.4
Incidents · Tasman Sea	1	0	0	—	0.8× / 1.2
Volcanic · Philippine Sealong running	0	310	10	1,139	— / 0
Surveys · The Northwestern Passageslong running	0	217	7	530	— / 0
Wrecks · Arabian Sealong running	0	204.5	6	479	0.0× / 1.2
Wrecks · The Northwestern Passageslong running	0	186	6	881	— / 0
Mines · Black Sealong running	0	124	4	706	— / 0
Wrecks · Caribbean Sea	0	124	4	325	— / 0
Wrecks · North Atlantic Ocean	0	124	4	105	0.0× / 0.4
Nav aids · Laccadive Sealong running	0	100.4	3	596	0.0× / 0.2
Ordnance · Bay of Biscay	0	93	3	226	— / 0
Nav aids · Beaufort Sealong running	0	93	3	538	— / 0
Other · Caribbean Sealong running	0	93	3	825	0.0× / 0.2
Wrecks · Hudson Baylong running	0	93	3	460	— / 0
Wrecks · South China Sealong running	0	93	3	1,791	0.0× / 1.6
Other · South Atlantic Ocean	0	80.7	2	274	0.0× / 2
Nav aids · Arabian Sealong running	0	62	2	826	0.0× / 1.6
Surveys · Arctic Ocean	0	62	2	98	0.0× / 0.2
Wrecks · Bay of Bengal	0	62	2	189	0.0× / 0.2
Nav aids · Bay of Biscaylong running	0	62	2	551	0.0× / 0.2
Nav aids · Bering Sealong running	0	62	2	404	0.0× / 0.6
Surveys · Chukchi Sea	0	62	2	175	— / 0
Wrecks · Coral Sealong running	0	62	2	579	— / 0
Nav aids · Hudson Strait	0	62	2	201	— / 0
Surveys · Kara Sealong running	0	62	2	555	— / 0
Wrecks · Kara Sea	0	62	2	106	— / 0
Wrecks · Laccadive Sea	0	62	2	348	— / 0
Surveys · Mediterranean Sea - Eastern Basin	0	62	2	42	0.0× / 3.2
Nav aids · Persian Gulflong running	0	62	2	617	0.0× / 0.2
Other · Persian Gulf	0	62	2	349	— / 0
Wrecks · South Atlantic Oceanlong running	0	57.8	1	614	0.0× / 0.6
Surveys · Black Sea	0	47	1	98	0.0× / 0.2
Spills · North Atlantic Oceanlong running	0	43	1	559	0.0× / 1.8
Other · Arafura Sea	0	31	1	169	0.0× / 0.6
Nav aids · Arctic Ocean	0	31	1	110	— / 0
Other · Bay of Bengal	0	31	1	179	— / 0
Debris · Bay of Biscaylong running	0	31	1	511	— / 0
Surveys · Beaufort Sea	0	31	1	175	0.0× / 0.2
Other · Black Sea	0	31	1	318	— / 0
War risk · Black Sealong running	0	31	1	680	— / 0
Wrecks · Eastern China Sea	0	31	1	187	— / 0
Nav aids · Gulf of Californialong running	0	31	1	656	— / 0
Wrecks · Gulf of Mexicolong running	0	31	1	689	— / 0
Nav aids · Gulf of St. Lawrence	0	31	1	163	— / 0
Nav aids · Hudson Baylong running	0	31	1	504	— / 0
Wrecks · Indian Ocean	0	31	1	121	— / 0
Cable ops · Java Sea	0	31	1	97	— / 0
Cable ops · Ligurian Sea	0	31	1	44	— / 0
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	31	1	973	0.0× / 0.2
Structures · Mozambique Channel	0	31	1	337	— / 0
Restricted · North Atlantic Ocean	0	31	1	314	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2024-01, 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.