Sea Ledger, January 2023

2023-01-01 to 2023-01-31 · archive

issued: 664
warning-days in force: 13,842
in force at month end: 450
sea × type cells: 225

baseline: same month, previous 5 years (2022-01, 2021-01, 2020-01, 2019-01, 2018-01)

By type

type	issued	warning-days	in force at end
Incidents	134	1,977.9	60
Exercises	121	950.5	26
Icebergs	94	96.2	4
Nav aids	65	4,223	144
Surveys	60	2,614.7	83
Missiles	43	286.3	10
Derelicts	34	248.7	7
Quakes	30	81	0
Cable ops	27	450.1	16
Other	21	714.1	30
Debris	12	104.6	5
Spills	9	169	3
Wrecks	6	1,389.7	45
Structures	4	127	4
Piracy	2	6	0
Volcanic	1	221	8
Containers	1	3.4	0
Mines	0	62	2
Restricted	0	31	1
Ordnance	0	54.4	1
War risk	0	31	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Labrador Sea	33	37.5	2	32	1.1× / 31.2
Icebergs · Southern Ocean	32	30.8	1	31	1.3× / 25
Incidents · South China Sea	31	326.8	10	49	1.1× / 29.2
Incidents · North Atlantic Oceansurge	30	664.6	22	88	3.4× / 8.8
Icebergs · South Atlantic Ocean	27	26.6	0	—	0.9× / 30.4
Exercises · North Pacific Ocean	19	150.2	3	66	0.9× / 22.2
Missiles · North Atlantic Ocean	17	113.7	1	45	1.5× / 11.2
Incidents · North Pacific Ocean	16	153.1	6	49	1.3× / 12.6
Surveys · North Atlantic Oceansurgelong running	15	511.3	17	399	3.6× / 4.2
Exercises · Arabian Sea	15	114.9	4	35	1.2× / 12.6
Surveys · Arabian Sea	13	395.9	13	68	1.8× / 7.2
Exercises · Bay of Bengal	13	87.2	3	29	1.3× / 10.4
Nav aids · South Atlantic Ocean	12	931.8	32	209	1.8× / 6.8
Exercises · Celtic Seasurge	11	16.6	0	—	55× / 0.2
Exercises · South Atlantic Ocean	10	83.7	1	215	1.0× / 10
Exercises · Laccadive Seasurge	10	53.3	1	32	4.2× / 2.4
Exercises · Bay of Biscaysurge	10	12.6	0	—	50× / 0.2
Nav aids · North Sea	9	187.2	5	236	1.0× / 9.4
Nav aids · North Atlantic Oceanlong running	9	178	7	656	0.8× / 11.2
Missiles · Indian Ocean	9	44.1	3	33	1.5× / 6
Derelicts · North Atlantic Ocean	9	27.9	0	—	1.6× / 5.8
Incidents · South Pacific Ocean	9	21	0	—	1.6× / 5.8
Surveys · South Atlantic Ocean	8	309	8	148	0.4× / 19.4
Surveys · Persian Gulflong running	8	297.7	11	743	1.5× / 5.2
Quakes · South Pacific Ocean	8	24	0	—	0.9× / 8.8
Incidents · Arabian Sea	7	142.3	3	35	1.4× / 5.2
Missiles · South Pacific Ocean	7	36.2	2	25	1.6× / 4.4
Nav aids · South Pacific Oceanlong running	6	563	22	560	1.9× / 3.2
Incidents · Laccadive Sea	6	106.6	2	49	1.5× / 4
Exercises · North Atlantic Ocean	6	105.2	4	158	0.8× / 7.4
Quakes · Molukka Seasurge	6	15	0	—	7.5× / 0.8
Quakes · Coral Seasurge	6	12	0	—	3.8× / 1.6
Nav aids · Caribbean Seasurgelong running	5	813.5	27	714	2.3× / 2.2
Exercises · Aegean Sealong running	5	142	5	392	0.3× / 15.6
Cable ops · Arabian Seasurge	5	132.7	5	48	4.2× / 1.2
Other · South Atlantic Oceansurge	5	71.5	4	149	5.0× / 1
Exercises · Andaman or Burma Seasurge	5	46.5	1	32	3.1× / 1.6
Derelicts · South China Seasurge	5	4.4	2	5	2.8× / 1.8
Nav aids · North Pacific Oceanlong running	4	398.1	13	669	0.9× / 4.2
Surveys · Bay of Bengal	4	214.1	4	78	1.5× / 2.6
Spills · Gulf of Mexico	4	70	1	36	1.0× / 4
Incidents · Indian Ocean	4	34.4	2	36	0.8× / 5
Cable ops · Red Seanew	4	12.6	1	19	new / 0
Derelicts · Caribbean Sea	4	12	0	—	1.4× / 2.8
Wrecks · North Pacific Oceansurge	3	89.2	3	183	15× / 0.2
Incidents · Java Sea	3	87.4	3	38	1.0× / 3
Spills · North Atlantic Ocean	3	73	1	194	1.9× / 1.6
Incidents · Caribbean Sea	3	67.3	3	41	1.1× / 2.8
Incidents · Gulf of Mexico	3	52.1	1	30	1.1× / 2.6
Incidents · Mediterranean Sea - Eastern Basin	3	50.9	0	—	0.4× / 8.2
Incidents · Bay of Bengalsurge	3	16.5	0	—	2.1× / 1.4
Exercises · Mediterranean Sea - Eastern Basin	3	15.6	0	—	0.2× / 18
Other · Gulf of Mexicosurge	3	12.5	2	11	2.5× / 1.2
Derelicts · Mozambique Channelnew	3	9	0	—	new / 0
Derelicts · North Pacific Ocean	3	8.9	0	—	1.1× / 2.8
Cable ops · Gulf of St. Lawrencenew	3	8.8	0	—	new / 0
Missiles · Philippine Sea	3	8.7	0	—	1.9× / 1.6
Incidents · Bismarck Sea	3	4	0	—	0.9× / 3.4
Nav aids · Gulf of Mexicolong running	2	253	8	669	0.6× / 3.2
Wrecks · Arabian Sea	2	169.9	6	255	2.5× / 0.8
Surveys · Indian Oceanlong running	2	145.6	5	714	0.6× / 3.4
Other · North Atlantic Ocean	2	140.1	4	134	1.3× / 1.6
Cable ops · Persian Gulflong running	2	122.4	4	537	2.0× / 1
Nav aids · Celtic Sea	2	122.1	3	165	1.3× / 1.6
Incidents · South Atlantic Ocean	2	72.2	2	47	0.4× / 4.8
Surveys · Caribbean Sea	2	66.1	2	93	2.0× / 1
Nav aids · Arafura Sea	2	47.1	1	209	3.3× / 0.6
Cable ops · Philippine Sea	2	31	1	35	1.7× / 1.2
Structures · North Seanew	2	29.4	1	29	new / 0
Incidents · English Channelnew	2	23.2	2	48	new / 0
Nav aids · Indian Ocean	2	22.3	1	81	1.1× / 1.8
Other · Arafura Sea	2	18.1	1	29	10× / 0.2
Cable ops · Indian Ocean	2	14.1	1	52	5.0× / 0.4
Nav aids · Inner Seas off the West Coast of Scotland	2	13.4	1	12	0.6× / 3.4
Cable ops · South China Sea	2	12.9	0	—	10× / 0.2
Exercises · Barentsz Sea	2	11.7	1	19	1.0× / 2
Cable ops · Caribbean Sea	2	10.7	0	—	10× / 0.2
Other · North Pacific Ocean	2	9.1	2	8	1.3× / 1.6
Surveys · South Pacific Ocean	2	8.8	1	8	1.4× / 1.4
Debris · South Pacific Ocean	2	8.6	1	19	2.5× / 0.8
Debris · North Atlantic Ocean	2	7.8	0	—	1.1× / 1.8
Missiles · South Atlantic Ocean	2	7.5	2	53	0.5× / 4
Derelicts · Gulf of Mexico	2	6	0	—	10× / 0.2
Debris · Indian Ocean	2	6	0	—	2.5× / 0.8
Derelicts · Kara Seanew	2	6	0	—	new / 0
Quakes · North Atlantic Ocean	2	6	0	—	2.5× / 0.8
Quakes · Southern Ocean	2	6	0	—	2.5× / 0.8
Exercises · Philippine Sea	2	5.4	0	—	0.7× / 3
Exercises · Coral Sea	2	3.7	0	—	5.0× / 0.4
Debris · North Pacific Ocean	2	3.6	1	3	3.3× / 0.6
Incidents · Solomon Sea	2	3	0	—	1.4× / 1.4
Cable ops · North Atlantic Ocean	2	2.3	1	9	0.4× / 5.4
Nav aids · Gulf of Alaska	2	1.7	0	—	0.9× / 2.2
Icebergs · North Atlantic Oceannew	2	1.3	1	1	new / 0
Wrecks · South Atlantic Ocean	1	179.6	6	249	2.5× / 0.4
Other · Arabian Sealong running	1	123	4	509	5.0× / 0.2
Nav aids · Arabian Sealong running	1	96.6	3	461	0.5× / 2.2
Nav aids · Laccadive Sea	1	83.5	3	231	5.0× / 0.2
Surveys · Laccadive Sea	1	72.6	2	353	1.3× / 0.8
Structures · South Atlantic Ocean	1	67.1	2	186	1.7× / 0.6
Incidents · Gulf of Thailand	1	53.7	1	35	0.8× / 1.2
Cable ops · Black Sea	1	50.3	2	91	1.7× / 0.6
Debris · Inner Seas off the West Coast of Scotland	1	38.6	2	311	new / 0
Derelicts · South Pacific Ocean	1	37.5	2	120	0.5× / 2
Derelicts · Arabian Sea	1	36.9	1	166	0.4× / 2.4
Exercises · Black Sea	1	35.5	1	314	0.1× / 12.2
Missiles · North Pacific Oceanlong running	1	35.4	1	595	0.2× / 5.4
Structures · South China Sea	1	30.5	1	30	new / 0
Missiles · Aegean Sealong running	1	29.6	1	393	2.5× / 0.4
Exercises · Ionian Sealong running	1	29.6	1	392	0.8× / 1.2
Surveys · North Pacific Ocean	1	27.8	0	—	5.0× / 0.2
Surveys · Tasman Sea	1	18.9	1	18	1.7× / 0.6
Spills · North Pacific Ocean	1	17	0	—	0.5× / 2
Incidents · Molukka Sea	1	15.6	0	—	5.0× / 0.2
Other · Bay of Biscay	1	13.6	1	13	5.0× / 0.2
Exercises · Red Sea	1	12.3	0	—	1.3× / 0.8
Incidents · Singapore Strait	1	11.3	1	11	5.0× / 0.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	9	1	9	2.5× / 0.4
Other · English Channel	1	8.5	1	8	5.0× / 0.2
Surveys · Celtic Sea	1	7.3	0	—	2.5× / 0.4
Exercises · Adriatic Sea	1	6.7	0	—	new / 0
Surveys · Andaman or Burma Sea	1	6	1	6	1.0× / 1
Exercises · Tasman Sea	1	5.8	1	5	new / 0
Other · South Pacific Ocean	1	5.6	0	—	1.7× / 0.6
Missiles · Celtic Sea	1	5.5	0	—	new / 0
Exercises · South Pacific Ocean	1	5.5	0	—	0.1× / 6.6
Cable ops · Celtic Sea	1	5	0	—	1.7× / 0.6
Incidents · Malacca Strait	1	4.7	0	—	2.5× / 0.4
Derelicts · Tasman Sea	1	4.5	0	—	0.6× / 1.6
Nav aids · English Channel	1	4.4	1	4	0.6× / 1.8
Exercises · Indian Ocean	1	4.3	0	—	0.5× / 2
Volcanic · North Pacific Ocean	1	4	1	3	new / 0
Missiles · Arabian Sea	1	3.7	0	—	1.7× / 0.6
Nav aids · Great Australian Bight	1	3.7	1	3	1.0× / 1
Nav aids · Coral Sea	1	3.3	0	—	0.3× / 3.6
Derelicts · Arafura Sea	1	3	0	—	0.7× / 1.4
Quakes · Banda Sea	1	3	0	—	1.7× / 0.6
Derelicts · Bay of Biscay	1	3	0	—	new / 0
Quakes · Caribbean Sea	1	3	0	—	0.5× / 2
Debris · Coral Sea	1	3	0	—	0.8× / 1.2
Quakes · Gulf of Tomini	1	3	0	—	5.0× / 0.2
Quakes · Indian Ocean	1	3	0	—	0.6× / 1.8
Piracy · Java Sea	1	3	0	—	new / 0
Quakes · Mediterranean Sea - Eastern Basin	1	3	0	—	1.3× / 0.8
Quakes · Philippine Sea	1	3	0	—	0.6× / 1.6
Containers · South Pacific Ocean	1	3	0	—	new / 0
Piracy · South Pacific Ocean	1	3	0	—	new / 0
Debris · Tasman Sea	1	3	0	—	5.0× / 0.2
Debris · Timor Sea	1	3	0	—	2.5× / 0.4
Nav aids · Bay of Bengal	1	2.8	0	—	1.7× / 0.6
Derelicts · South Atlantic Ocean	1	2.6	0	—	0.8× / 1.2
Exercises · Mozambique Channel	1	2.2	0	—	new / 0
Missiles · Laccadive Sea	1	1.9	0	—	0.7× / 1.4
Cable ops · Bay of Bengal	1	1.6	1	71	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	1.2	0	—	5.0× / 0.2
Incidents · Bering Sea	1	1.1	1	1	5.0× / 0.2
Other · Laccadive Sea	1	1.1	0	—	new / 0
Surveys · Mediterranean Sea - Western Basin	1	1.1	1	1	1.3× / 0.8
Other · Gulf of Alaska	1	0.6	0	—	5.0× / 0.2
Other · North Sea	1	0.4	1	0	1.7× / 0.6
Nav aids · Strait of Gibraltar	1	0.3	0	—	1.0× / 1
Incidents · Timor Sea	1	0.1	0	—	5.0× / 0.2
Incidents · Coral Sea	1	0	0	—	0.2× / 4.4
Wrecks · The Northwestern Passageslong running	0	217	7	516	— / 0
Volcanic · Philippine Sealong running	0	186	6	774	— / 0
Wrecks · Caribbean Sealong running	0	155	5	465	— / 0
Surveys · The Northwestern Passages	0	155	5	165	— / 0
Wrecks · Persian Gulflong running	0	135.3	4	699	0.0× / 1
Surveys · Kara Sea	0	124	4	204	— / 0
Nav aids · Bay of Biscay	0	93	3	186	0.0× / 0.2
Other · Coral Sea	0	93	3	286	— / 0
Wrecks · North Atlantic Oceanlong running	0	93	3	615	0.0× / 0.4
Wrecks · South China Sealong running	0	93	3	1,426	0.0× / 1.8
Nav aids · Andaman or Burma Sea	0	62	2	320	0.0× / 0.6
Surveys · Barentsz Sea	0	62	2	204	0.0× / 0.4
Mines · Black Sea	0	62	2	341	— / 0
Other · Caribbean Sealong running	0	62	2	460	0.0× / 0.2
Nav aids · Gulf of Californialong running	0	62	2	714	— / 0
Surveys · Gulf of Mexico	0	62	2	61	0.0× / 0.6
Wrecks · Hudson Bay	0	62	2	95	— / 0
Wrecks · North Sealong running	0	62	2	416	0.0× / 0.8
Nav aids · Persian Gulf	0	62	2	252	0.0× / 0.2
Other · Persian Gulf	0	62	2	180	— / 0
Derelicts · Laccadive Sea	0	56	1	223	0.0× / 1.4
Ordnance · North Sea	0	54.4	1	362	0.0× / 0.8
Nav aids · Arctic Ocean	0	31	1	132	— / 0
Surveys · Arctic Ocean	0	31	1	142	0.0× / 0.2
Nav aids · Barentsz Sea	0	31	1	80	— / 0
Derelicts · Bay of Bengal	0	31	1	228	0.0× / 0.8
Debris · Bay of Biscay	0	31	1	146	— / 0
Nav aids · Beaufort Sea	0	31	1	173	— / 0
Nav aids · Bering Sea	0	31	1	39	0.0× / 0.6
Other · Black Sea	0	31	1	73	— / 0
Surveys · Black Sea	0	31	1	56	0.0× / 0.2
War risk · Black Sea	0	31	1	315	— / 0
Wrecks · Coral Sea	0	31	1	214	— / 0
Other · Great Australian Bight	0	31	1	107	0.0× / 1.6
Surveys · Gulf of Guinea	0	31	1	91	0.0× / 0.4
Wrecks · Gulf of Mexico	0	31	1	324	— / 0
Nav aids · Hudson Bay	0	31	1	139	— / 0

Cite: seahazards.com Sea Ledger, 2023-01, 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.