Sea Ledger, February 2023

2023-02-01 to 2023-02-28 · archive

issued: 589
warning-days in force: 12,760
in force at month end: 467
sea × type cells: 220

baseline: same month, previous 5 years (2022-02, 2021-02, 2020-02, 2019-02, 2018-02)

By type

type	issued	warning-days	in force at end
Exercises	126	1,001.6	44
Incidents	102	1,223.5	45
Icebergs	82	86	3
Surveys	69	2,359.4	89
Nav aids	53	4,174.6	152
Missiles	42	342.5	8
Derelicts	23	206.9	7
Quakes	23	66.6	2
Other	18	804.1	29
Cable ops	17	445.1	15
Debris	16	128.1	4
Spills	11	166	6
Wrecks	3	1,259.2	44
Containers	3	20.4	1
Structures	1	112.2	5
Volcanic	0	224	8
Mines	0	56	2
Restricted	0	28	1
Ordnance	0	28	1
War risk	0	28	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Labrador Sea	28	32.5	2	29	1.0× / 27.6
Icebergs · Southern Ocean	28	26.9	1	28	1.1× / 26
Exercises · North Pacific Ocean	27	151.2	9	63	1.5× / 18.4
Icebergs · South Atlantic Ocean	26	25.9	0	—	1.1× / 23.4
Incidents · South China Sea	24	231.8	7	66	0.9× / 26.8
Surveys · Arabian Seasurge	17	341.7	13	50	2.7× / 6.4
Surveys · South Atlantic Ocean	17	292.2	11	176	0.7× / 24.6
Incidents · North Atlantic Ocean	16	328.2	11	116	1.4× / 11.4
Exercises · Bay of Bengal	16	89.4	2	57	1.9× / 8.4
Missiles · North Atlantic Ocean	13	54.2	2	29	1.3× / 9.8
Incidents · North Pacific Ocean	12	159.7	7	46	0.8× / 14.4
Nav aids · North Pacific Oceansurgelong running	10	386.2	14	697	4.2× / 2.4
Exercises · South Pacific Ocean	10	30.3	1	27	1.2× / 8.2
Nav aids · North Atlantic Oceansurgelong running	9	242	8	684	2.8× / 3.2
Exercises · Arabian Sea	9	70.7	5	40	1.1× / 8.2
Nav aids · South Atlantic Ocean	8	940.2	37	200	0.9× / 8.6
Surveys · North Atlantic Ocean	8	448.3	17	252	1.1× / 7
Missiles · South Pacific Oceansurge	8	81.1	1	29	4.4× / 1.8
Exercises · Celtic Seasurge	8	12.3	0	—	3.6× / 2.2
Missiles · Indian Ocean	7	52.7	1	28	1.5× / 4.6
Exercises · Laccadive Seasurge	7	42.4	3	28	3.5× / 2
Debris · North Pacific Oceansurge	7	17.4	0	—	35× / 0.2
Exercises · North Atlantic Ocean	6	113.4	4	171	1.1× / 5.2
Incidents · Caribbean Seasurge	6	101.7	3	65	2.0× / 3
Spills · North Pacific Oceansurge	6	78	2	25	2.1× / 2.8
Exercises · Black Sea	6	68.1	2	342	0.4× / 15
Incidents · South Pacific Ocean	6	41.1	1	26	0.9× / 6.8
Incidents · Coral Sea	6	3.8	0	—	1.3× / 4.8
Surveys · Persian Gulflong running	5	255.6	9	771	1.0× / 5
Nav aids · North Sea	5	145.2	5	264	0.4× / 11.8
Surveys · Caribbean Seasurge	5	64.7	2	121	5.0× / 1
Missiles · South Atlantic Ocean	5	53.1	1	31	1.8× / 2.8
Other · North Pacific Oceansurge	5	47.9	1	36	2.8× / 1.8
Exercises · Japan Seasurge	5	25.4	1	19	2.5× / 2
Derelicts · North Atlantic Ocean	5	15	0	—	0.4× / 11.8
Cable ops · Arabian Seasurge	4	145.2	3	48	2.2× / 1.8
Surveys · Bay of Bengal	4	133.1	6	104	1.3× / 3
Exercises · Barentsz Seasurge	4	39.4	2	30	4.0× / 1
Derelicts · Caribbean Seasurge	4	25.7	1	18	2.9× / 1.4
Exercises · Andaman or Burma Sea	4	19.2	1	28	1.8× / 2.2
Exercises · Bay of Biscaysurge	4	15.7	0	—	6.7× / 0.6
Debris · Indian Oceansurge	4	12	0	—	3.3× / 1.2
Quakes · South Pacific Ocean	4	10.7	1	23	0.3× / 12.8
Nav aids · South Pacific Oceanlong running	3	623.8	20	588	1.1× / 2.8
Nav aids · Gulf of Mexicosurgelong running	3	228	9	697	2.1× / 1.4
Surveys · Indian Oceanlong running	3	160.1	7	742	0.8× / 3.8
Other · South Atlantic Oceansurge	3	137.8	4	177	5.0× / 0.6
Other · North Atlantic Oceansurge	3	83.1	3	162	2.1× / 1.4
Incidents · Gulf of Mexico	3	62.8	2	58	1.5× / 2
Incidents · Arabian Sea	3	59.1	3	63	0.8× / 3.6
Exercises · Red Seasurge	3	45.4	2	25	3.8× / 0.8
Derelicts · South Pacific Ocean	3	38.4	1	148	1.7× / 1.8
Incidents · Philippine Sea	3	37.3	2	23	0.9× / 3.4
Debris · South Pacific Oceansurge	3	36	2	33	3.8× / 0.8
Incidents · Laccadive Sea	3	29.8	1	66	1.4× / 2.2
Containers · Persian Gulfnew	3	20.4	1	17	new / 0
Incidents · Indian Ocean	3	16.6	2	30	0.9× / 3.2
Nav aids · Bristol Channelsurge	3	14.7	1	22	7.5× / 0.4
Nav aids · Coral Sea	3	13.6	0	—	1.5× / 2
Exercises · Indian Oceansurge	3	13.2	0	—	3.0× / 1
Quakes · Philippine Sea	3	9	0	—	1.5× / 2
Exercises · Mozambique Channelnew	3	4.8	1	27	new / 0
Exercises · Philippine Sea	3	4.3	1	22	0.5× / 5.6
Surveys · Laccadive Sealong running	2	77.1	3	381	5.0× / 0.4
Other · Persian Gulfnew	2	68.9	3	208	new / 0
Exercises · South Atlantic Ocean	2	50.6	2	243	0.3× / 7
Other · Gulf of Mexico	2	45.3	2	39	3.3× / 0.6
Missiles · North Pacific Oceanlong running	2	34.9	1	623	0.7× / 2.8
Cable ops · North Atlantic Ocean	2	34.3	1	28	0.5× / 4
Cable ops · Indian Oceannew	2	27.6	1	29	new / 0
Cable ops · Philippine Sea	2	27	1	38	2.5× / 0.8
Spills · The Coastal Waters of Southeast Alaska and British Columbia	2	26	1	37	0.9× / 2.2
Cable ops · Red Seanew	2	18.2	2	28	new / 0
Incidents · Mozambique Channel	2	17.7	2	16	10× / 0.2
Incidents · Bay of Bengal	2	14.1	2	13	2.5× / 0.8
Missiles · Black Sea	2	12.2	0	—	0.5× / 3.8
Cable ops · Caribbean Sea	2	8	0	—	2.0× / 1
Quakes · Banda Sea	2	6	0	—	5.0× / 0.4
Quakes · Mediterranean Sea - Eastern Basinnew	2	6	0	—	new / 0
Derelicts · North Pacific Oceannew	2	6	0	—	new / 0
Quakes · North Pacific Ocean	2	6	0	—	0.6× / 3.2
Quakes · Solomon Sea	2	6	0	—	2.5× / 0.8
Derelicts · South Atlantic Ocean	2	6	0	—	1.0× / 2
Quakes · South Atlantic Ocean	2	6	0	—	1.0× / 2
Surveys · Strait of Gibraltarnew	2	3.7	0	—	new / 0
Incidents · Tasman Sea	2	3.1	0	—	10× / 0.2
Incidents · Timor Seanew	2	1	0	—	new / 0
Nav aids · Caribbean Sealong running	1	747.5	27	742	0.2× / 4.2
Wrecks · South Atlantic Ocean	1	156.7	5	277	1.3× / 0.8
Cable ops · Persian Gulflong running	1	116	4	565	1.7× / 0.6
Nav aids · Laccadive Sea	1	88.5	4	259	2.5× / 0.4
Nav aids · Arabian Sealong running	1	85.5	4	489	0.6× / 1.6
Other · Caribbean Sealong running	1	59.1	3	488	5.0× / 0.2
Wrecks · Laccadive Sea	1	39.5	2	75	5.0× / 0.2
Exercises · Ionian Sea	1	36.4	2	57	1.0× / 1
Spills · North Atlantic Ocean	1	36	2	222	0.4× / 2.8
Nav aids · English Channel	1	32	2	32	0.3× / 3
Surveys · Black Sea	1	31.5	1	84	1.7× / 0.6
Nav aids · Inner Seas off the West Coast of Scotland	1	31.5	1	40	0.2× / 4.4
Surveys · Andaman or Burma Sea	1	29	1	34	0.5× / 2
Derelicts · Arabian Sea	1	28.4	2	194	2.5× / 0.4
Nav aids · Southern Ocean	1	22.8	1	22	new / 0
Surveys · Tasman Sea	1	21.9	1	46	0.8× / 1.2
Surveys · Great Australian Bight	1	17.9	1	17	0.6× / 1.6
Other · Malacca Strait	1	16.5	0	—	new / 0
Incidents · Solomon Sea	1	16.4	0	—	0.8× / 1.2
Incidents · Malacca Strait	1	16.2	0	—	5.0× / 0.2
Derelicts · Mediterranean Sea - Eastern Basin	1	15.1	0	—	0.7× / 1.4
Spills · Philippine Sea	1	14	0	—	new / 0
Exercises · North Sea	1	12.7	0	—	new / 0
Nav aids · Great Australian Bight	1	12.6	0	—	2.5× / 0.4
Exercises · Adriatic Sea	1	12.5	0	—	2.5× / 0.4
Spills · Gulf of Mexico	1	12	1	38	0.2× / 4.8
Surveys · South China Sea	1	11	1	10	1.7× / 0.6
Nav aids · South China Sea	1	10.3	0	—	5.0× / 0.2
Missiles · Philippine Sea	1	8.5	0	—	1.3× / 0.8
Incidents · Mediterranean Sea - Eastern Basin	1	7.3	1	7	0.3× / 3.6
Other · Tasman Sea	1	6.8	1	6	1.3× / 0.8
Cable ops · Laccadive Sea	1	6.6	1	6	new / 0
Surveys · South Pacific Ocean	1	6.6	0	—	0.8× / 1.2
Wrecks · South Pacific Ocean	1	6.4	0	—	1.3× / 0.8
Missiles · Barentsz Sea	1	6.2	0	—	0.2× / 4.8
Missiles · Kara Sea	1	6.1	0	—	new / 0
Missiles · Laccadive Sea	1	4.9	0	—	1.0× / 1
Incidents · Bismarck Sea	1	3.8	0	—	0.4× / 2.6
Incidents · Gulf of Thailand	1	3.7	0	—	1.0× / 1
Incidents · Ionian Sea	1	3.7	1	3	2.5× / 0.4
Cable ops · Mozambique Channel	1	3.3	1	3	2.5× / 0.4
Derelicts · Bay of Biscay	1	3	0	—	0.6× / 1.6
Debris · Caribbean Sea	1	3	0	—	new / 0
Quakes · Caribbean Sea	1	3	0	—	new / 0
Debris · Celtic Sea	1	3	0	—	0.4× / 2.6
Quakes · Coral Sea	1	3	0	—	0.7× / 1.4
Derelicts · Gulf of Mexico	1	3	0	—	2.5× / 0.4
Derelicts · Indian Ocean	1	3	0	—	0.3× / 3
Quakes · Indian Ocean	1	3	0	—	0.5× / 2.2
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	0.8× / 1.2
Quakes · Molukka Sea	1	3	0	—	1.3× / 0.8
Incidents · Norwegian Sea	1	3	0	—	new / 0
Quakes · Tasman Sea	1	3	0	—	new / 0
Exercises · Coral Sea	1	2.1	0	—	2.5× / 0.4
Quakes · Gulf of Tomini	1	1.9	1	1	new / 0
Exercises · Baltic Sea	1	1.5	1	1	1.7× / 0.6
Derelicts · Arafura Sea	1	1.4	1	1	5.0× / 0.2
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	0.9	0	—	1.3× / 0.8
Missiles · Gulf of Mexico	1	0.6	1	0	new / 0
Exercises · Caribbean Sea	1	0.2	0	—	0.7× / 1.4
Structures · Mozambique Channel	1	0.2	1	0	new / 0
Incidents · Celtic Sea	1	0.1	0	—	new / 0
Incidents · Great Australian Bight	1	0.1	0	—	5.0× / 0.2
Wrecks · The Northwestern Passageslong running	0	196	7	544	— / 0
Wrecks · Arabian Sea	0	168	6	283	0.0× / 0.8
Volcanic · Philippine Sealong running	0	168	6	802	0.0× / 0.2
Exercises · Aegean Sea	0	140	5	57	0.0× / 10.2
Wrecks · Caribbean Sealong running	0	140	5	493	0.0× / 1.4
Surveys · The Northwestern Passages	0	140	5	193	— / 0
Other · Arabian Sealong running	0	112	4	537	0.0× / 0.4
Surveys · Kara Sea	0	112	4	232	— / 0
Wrecks · Persian Gulflong running	0	112	4	727	0.0× / 0.4
Nav aids · Bay of Biscay	0	84	3	214	— / 0
Other · Coral Sea	0	84	3	314	0.0× / 0.6
Wrecks · North Atlantic Oceanlong running	0	84	3	643	0.0× / 0.2
Wrecks · South China Sealong running	0	84	3	1,454	0.0× / 0.8
Wrecks · North Pacific Ocean	0	76.6	2	211	— / 0
Nav aids · Celtic Sea	0	59.1	2	193	0.0× / 1.6
Nav aids · Andaman or Burma Sea	0	56	2	348	0.0× / 0.2
Surveys · Barentsz Sea	0	56	2	232	— / 0
Mines · Black Sealong running	0	56	2	369	0.0× / 0.4
Nav aids · Gulf of Californialong running	0	56	2	742	0.0× / 0.2
Surveys · Gulf of Mexico	0	56	2	89	0.0× / 1.4
Wrecks · Hudson Bay	0	56	2	123	— / 0
Wrecks · North Sealong running	0	56	2	444	0.0× / 1
Nav aids · Persian Gulf	0	56	2	280	— / 0
Structures · South Atlantic Ocean	0	56	2	214	0.0× / 0.4
Cable ops · Black Sea	0	30.9	0	—	— / 0
Debris · Inner Seas off the West Coast of Scotland	0	28.7	1	339	— / 0
Missiles · Aegean Sea	0	28	1	57	— / 0
Nav aids · Arafura Sea	0	28	1	237	0.0× / 1
Nav aids · Arctic Ocean	0	28	1	160	— / 0
Surveys · Arctic Ocean	0	28	1	170	— / 0
Nav aids · Barentsz Sea	0	28	1	108	— / 0
Cable ops · Bay of Bengal	0	28	1	29	0.0× / 0.2
Derelicts · Bay of Bengal	0	28	1	256	0.0× / 1.6
Debris · Bay of Biscay	0	28	1	174	— / 0
Other · Bay of Biscay	0	28	1	41	— / 0
Nav aids · Beaufort Sea	0	28	1	201	— / 0
Nav aids · Bering Sea	0	28	1	67	0.0× / 1
Other · Black Sea	0	28	1	101	— / 0
War risk · Black Sea	0	28	1	343	— / 0
Wrecks · Coral Sea	0	28	1	242	— / 0
Other · English Channel	0	28	1	36	0.0× / 1.6
Other · Great Australian Bight	0	28	1	135	0.0× / 0.8
Surveys · Gulf of Guinea	0	28	1	119	0.0× / 0.4
Wrecks · Gulf of Mexico	0	28	1	352	— / 0
Nav aids · Hudson Bay	0	28	1	167	— / 0
Surveys · Hudson Baylong running	0	28	1	559	— / 0
Restricted · Indian Ocean	0	28	1	256	— / 0
Nav aids · Irish Sea and St. George's Channel	0	28	1	243	0.0× / 0.6
Derelicts · Laccadive Sea	0	28	1	251	0.0× / 1.2
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	28	1	636	— / 0

Cite: seahazards.com Sea Ledger, 2023-02, 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.