Sea Ledger, April 2022

2022-04-01 to 2022-04-30 · archive

issued: 632
warning-days in force: 9,504
in force at month end: 312
sea × type cells: 201

baseline: same month, previous 5 years (2021-04, 2020-04, 2019-04, 2018-04, 2017-04)

By type

type	issued	warning-days	in force at end
Exercises	136	1,117.1	41
Incidents	97	1,168	31
Icebergs	94	106.9	4
Surveys	68	1,773.3	65
Nav aids	59	2,907.8	95
Missiles	45	305.1	7
Quakes	34	114.3	2
Towing	20	23.1	1
Other	19	338.5	10
Cable ops	18	313.5	12
Derelicts	17	108.7	2
Spills	10	150	4
Debris	8	52.7	3
Wrecks	5	715	25
Ordnance	1	33.1	1
Piracy	1	7	0
Mines	0	60	2
War risk	0	30	1
Volcanic	0	180	6

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Southern Ocean	46	46.5	1	30	1.4× / 32.2
Exercises · North Pacific Ocean	25	220.4	12	60	1.1× / 23.6
Towing · North Pacific Oceannew	20	23.1	1	30	new / 0
Incidents · North Atlantic Oceansurge	18	349.7	8	85	2.6× / 7
Exercises · Bay of Bengalsurge	18	123.6	2	40	2.1× / 8.6
Surveys · South Atlantic Ocean	18	118.4	6	67	1.0× / 18.8
Exercises · South Pacific Oceansurge	18	78.9	3	34	3.5× / 5.2
Icebergs · Labrador Sea	18	20.5	2	22	0.9× / 19.2
Incidents · South China Sea	17	209.6	5	57	0.7× / 25.6
Missiles · North Atlantic Oceansurge	16	45.2	1	34	2.5× / 6.4
Icebergs · South Atlantic Ocean	14	13.3	1	13	0.7× / 20.4
Surveys · Arabian Sea	13	239.7	7	159	1.6× / 8.4
Nav aids · North Sea	13	51.4	1	64	1.9× / 6.8
Nav aids · South Atlantic Ocean	12	429.5	17	207	0.9× / 12.6
Incidents · North Pacific Ocean	12	116.8	3	40	0.6× / 19.6
Icebergs · North Atlantic Ocean	12	14.6	0	—	1.1× / 10.4
Exercises · South Atlantic Oceansurge	11	107.4	6	47	2.1× / 5.2
Exercises · Arabian Sea	11	100.7	2	45	1.1× / 10.4
Quakes · South Pacific Ocean	11	45.2	1	31	1.1× / 9.8
Surveys · Persian Gulflong running	10	305.7	10	467	1.8× / 5.6
Exercises · North Atlantic Oceansurge	9	41.2	1	123	2.3× / 4
Incidents · Indian Ocean	8	66.5	2	43	1.4× / 5.8
Missiles · South Pacific Oceansurge	8	42.7	2	30	4.4× / 1.8
Incidents · South Atlantic Ocean	8	25.2	1	39	1.2× / 6.6
Exercises · Celtic Seasurge	8	11.7	0	—	40× / 0.2
Nav aids · North Pacific Oceanlong running	7	304.2	10	511	1.7× / 4.2
Missiles · Indian Oceansurge	7	41.6	1	34	2.7× / 2.6
Exercises · Barentsz Seasurge	7	28.2	4	10	3.9× / 1.8
Nav aids · South Pacific Oceanlong running	6	469.1	16	542	1.3× / 4.8
Missiles · North Pacific Ocean	6	59.9	2	319	1.3× / 4.6
Exercises · Andaman or Burma Seasurge	6	29.8	1	30	3.3× / 1.8
Nav aids · North Atlantic Oceanlong running	5	187.1	7	380	1.0× / 5.2
Surveys · Indian Oceanlong running	5	93.6	5	438	1.9× / 2.6
Cable ops · Arabian Seasurge	5	65.7	6	44	3.6× / 1.4
Exercises · Bay of Biscaynew	5	42.3	0	—	new / 0
Incidents · Laccadive Seasurge	5	31.6	1	29	4.2× / 1.2
Surveys · North Atlantic Ocean	4	533.4	18	123	0.5× / 8.4
Incidents · Gulf of Mexicosurge	4	56.4	2	45	2.5× / 1.6
Incidents · Arabian Seasurge	4	40.4	4	62	3.3× / 1.2
Derelicts · South Pacific Ocean	4	39.7	1	31	1.5× / 2.6
Cable ops · Ligurian Seanew	4	18.4	0	—	new / 0
Quakes · Coral Seasurge	4	12	0	—	20× / 0.2
Incidents · South Pacific Ocean	3	91.8	1	55	0.6× / 5.4
Spills · North Pacific Ocean	3	57	0	—	1.0× / 3
Surveys · North Sea	3	42.4	2	39	1.3× / 2.4
Spills · Gulf of Mexico	3	40	1	25	0.5× / 6
Exercises · Laccadive Sea	3	33.2	1	32	1.9× / 1.6
Surveys · Caribbean Seasurge	3	30	1	31	3.0× / 1
Incidents · Bay of Bengalsurge	3	29.4	0	—	7.5× / 0.4
Derelicts · North Atlantic Ocean	3	19	1	32	1.3× / 2.4
Cable ops · North Pacific Oceansurge	3	14.4	0	—	3.8× / 0.8
Derelicts · North Pacific Oceansurge	3	11.2	0	—	3.0× / 1
Exercises · Indian Ocean	3	10.7	0	—	1.7× / 1.8
Quakes · North Pacific Ocean	3	9.7	0	—	1.1× / 2.8
Quakes · Philippine Sea	3	9	0	—	0.8× / 3.6
Quakes · South Atlantic Oceansurge	3	9	0	—	2.1× / 1.4
Debris · Coral Seasurge	3	7.9	1	4	2.1× / 1.4
Nav aids · Caribbean Sealong running	2	619.6	21	565	1.7× / 1.2
Other · North Atlantic Ocean	2	68	1	133	0.3× / 6.4
Nav aids · Inner Seas off the West Coast of Scotland	2	58.4	1	69	0.6× / 3.2
Exercises · Black Sea	2	41.1	1	38	0.1× / 13.2
Incidents · Mozambique Channelnew	2	35.5	2	41	new / 0
Cable ops · South Pacific Ocean	2	32.3	1	33	1.3× / 1.6
Nav aids · Bass Strait	2	32.1	1	30	10× / 0.2
Missiles · Barentsz Sea	2	32	0	—	0.5× / 3.8
Incidents · Caribbean Sea	2	30.7	0	—	0.8× / 2.4
Cable ops · North Atlantic Ocean	2	29	1	33	0.4× / 4.8
Spills · The Coastal Waters of Southeast Alaska and British Columbia	2	23	1	41	3.3× / 0.6
Exercises · Mediterranean Sea - Western Basin	2	19.5	1	43	0.6× / 3.4
Other · Indian Ocean	2	17.6	0	—	2.5× / 0.8
Other · Andaman or Burma Seanew	2	14.3	0	—	new / 0
Missiles · Arabian Sea	2	11.3	0	—	1.7× / 1.2
Other · Bay of Bengalnew	2	10.3	0	—	new / 0
Surveys · Bay of Bengal	2	10.1	2	5	0.9× / 2.2
Other · North Pacific Ocean	2	7.9	0	—	2.0× / 1
Icebergs · Barentsz Sea	2	6	0	—	10× / 0.2
Icebergs · Gulf of St. Lawrence	2	6	0	—	3.3× / 0.6
Quakes · Southern Ocean	2	6	0	—	10× / 0.2
Incidents · Tasman Sea	2	6	0	—	1.7× / 1.2
Quakes · Bismarck Sea	2	5.4	1	17	2.5× / 0.8
Derelicts · South China Sea	2	4.5	0	—	1.7× / 1.2
Derelicts · Indian Ocean	2	3.6	0	—	0.7× / 3
Other · South Atlantic Ocean	2	1.6	1	17	10× / 0.2
Exercises · Aegean Sea	1	90.5	3	117	0.1× / 10
Wrecks · Bay of Bengal	1	85.6	3	158	new / 0
Wrecks · Arabian Sea	1	84	3	281	1.0× / 1
Surveys · Bay of Biscay	1	82.6	3	80	2.5× / 0.4
Other · Caribbean Sea	1	62.7	2	184	2.5× / 0.4
Cable ops · Philippine Sea	1	57	1	116	1.3× / 0.8
Surveys · Gulf of Mexico	1	50	2	67	2.5× / 0.4
Surveys · Andaman or Burma Sea	1	48.6	2	37	5.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basin	1	46.2	1	332	new / 0
Nav aids · Mediterranean Sea - Western Basinlong running	1	46.2	1	659	0.8× / 1.2
Nav aids · Gulf of Californialong running	1	45.2	2	438	5.0× / 0.2
Wrecks · South Pacific Ocean	1	34.9	2	54	2.5× / 0.4
Incidents · Mediterranean Sea - Eastern Basin	1	34.4	0	—	0.1× / 9.6
Surveys · Laccadive Sea	1	33.6	1	77	5.0× / 0.2
Wrecks · Laccadive Sea	1	33	1	206	5.0× / 0.2
Wrecks · North Sea	1	31.3	2	140	0.5× / 2
Exercises · Caribbean Sea	1	30.6	2	52	1.3× / 0.8
Other · Gulf of Mexico	1	30	1	30	2.5× / 0.4
Nav aids · Great Australian Bight	1	28.4	0	—	5.0× / 0.2
Missiles · Japan Sea	1	28.2	0	—	0.3× / 4
Surveys · Mediterranean Sea - Eastern Basin	1	22.5	1	22	0.2× / 4.2
Nav aids · Mozambique Channel	1	21.5	0	—	5.0× / 0.2
Exercises · Japan Sea	1	21.4	0	—	1.7× / 0.6
Spills · North Atlantic Ocean	1	20	1	31	0.4× / 2.8
Incidents · Andaman or Burma Sea	1	18.7	0	—	new / 0
Other · Persian Gulf	1	17.4	1	17	5.0× / 0.2
Derelicts · Bay of Biscay	1	15.1	0	—	5.0× / 0.2
Surveys · Irish Sea and St. George's Channel	1	13.4	1	13	new / 0
Surveys · Mozambique Channel	1	12.8	1	12	2.5× / 0.4
Incidents · Mediterranean Sea - Western Basin	1	11.8	1	11	1.3× / 0.8
Surveys · North Pacific Ocean	1	11.5	1	11	1.0× / 1
Other · Coral Sea	1	10.6	1	10	5.0× / 0.2
Spills · Bering Sea	1	10	1	10	2.5× / 0.4
Surveys · Celtic Sea	1	9.5	0	—	2.5× / 0.4
Exercises · South China Sea	1	8.4	0	—	0.6× / 1.6
Exercises · Tasman Sea	1	8.3	0	—	new / 0
Derelicts · South Atlantic Ocean	1	8.1	0	—	0.7× / 1.4
Missiles · Kara Sea	1	7.5	0	—	new / 0
Piracy · North Atlantic Ocean	1	7	0	—	5.0× / 0.2
Derelicts · Caribbean Sea	1	5.7	0	—	1.7× / 0.6
Nav aids · Arafura Sea	1	5.5	0	—	1.0× / 1
Missiles · Laccadive Sea	1	5	0	—	1.0× / 1
Exercises · Alboran Sea	1	3.1	0	—	2.5× / 0.4
Ordnance · North Pacific Ocean	1	3.1	0	—	2.5× / 0.4
Quakes · Adriatic Sea	1	3	0	—	new / 0
Quakes · Andaman or Burma Sea	1	3	0	—	5.0× / 0.2
Incidents · Arafura Sea	1	3	0	—	1.7× / 0.6
Other · Bay of Biscay	1	3	0	—	5.0× / 0.2
Debris · Caribbean Sea	1	3	0	—	2.5× / 0.4
Quakes · Eastern China Sea	1	3	0	—	new / 0
Quakes · Indian Ocean	1	3	0	—	0.4× / 2.8
Quakes · Molukka Sea	1	3	0	—	1.3× / 0.8
Debris · North Pacific Ocean	1	3	0	—	2.5× / 0.4
Debris · Norwegian Sea	1	3	0	—	5.0× / 0.2
Quakes · South China Sea	1	3	0	—	5.0× / 0.2
Debris · South Pacific Ocean	1	3	0	—	0.5× / 2.2
Debris · Indian Ocean	1	2.8	1	2	0.5× / 2.2
Incidents · Ionian Sea	1	2.7	1	2	5.0× / 0.2
Exercises · Norwegian Sea	1	2.6	0	—	5.0× / 0.2
Surveys · Tasman Sea	1	2.5	0	—	1.7× / 0.6
Cable ops · Coral Sea	1	2.2	0	—	5.0× / 0.2
Exercises · Coral Sea	1	2.2	0	—	2.5× / 0.4
Other · South Pacific Ocean	1	2	1	2	1.7× / 0.6
Missiles · South China Sea	1	1.7	0	—	1.0× / 1
Nav aids · Bristol Channel	1	1.6	0	—	5.0× / 0.2
Nav aids · Gulf of Alaska	1	1.3	0	—	1.7× / 0.6
Incidents · Labrador Sea	1	1.2	0	—	2.5× / 0.4
Nav aids · Tasman Sea	1	1.2	0	—	2.5× / 0.4
Incidents · Celebes Sea	1	1	0	—	5.0× / 0.2
Other · Gulf of Alaska	1	0.8	0	—	new / 0
Nav aids · English Channel	1	0.4	1	0	0.4× / 2.8
Incidents · Gulf of Oman	1	0	0	—	new / 0
Incidents · Solomon Sea	1	0	0	—	1.7× / 0.6
Nav aids · Gulf of Mexicolong running	0	250.8	8	511	0.0× / 2.2
Volcanic · Philippine Sealong running	0	180	6	498	0.0× / 0.4
Wrecks · South China Sealong running	0	120	4	1,150	0.0× / 1.6
Wrecks · Persian Gulflong running	0	102.7	3	423	0.0× / 0.2
Nav aids · Andaman or Burma Sealong running	0	60	2	481	0.0× / 0.8
Nav aids · Arabian Sea	0	60	2	185	0.0× / 0.6
Mines · Black Sea	0	60	2	65	— / 0
Exercises · Ionian Sea	0	60	2	117	0.0× / 0.2
Wrecks · North Atlantic Ocean	0	60	2	339	0.0× / 0.2
Cable ops · Persian Gulf	0	60	2	261	0.0× / 0.4
Wrecks · The Northwestern Passages	0	60	2	240	— / 0
Nav aids · Irish Sea and St. George's Channel	0	44.7	1	40	0.0× / 1.4
Missiles · Aegean Sea	0	30	1	117	— / 0
Other · Arabian Sea	0	30	1	233	0.0× / 0.8
Nav aids · Bering Sea	0	30	1	69	0.0× / 0.2
War risk · Black Sea	0	30	1	39	— / 0
Wrecks · Caribbean Sea	0	30	1	189	0.0× / 0.4
Wrecks · Gulf of Mexico	0	30	1	48	— / 0
Surveys · Hudson Bay	0	30	1	255	— / 0
Cable ops · Indian Ocean	0	30	1	33	0.0× / 0.2
Nav aids · Indian Ocean	0	30	1	86	0.0× / 1.8
Debris · Inner Seas off the West Coast of Scotland	0	30	1	35	— / 0
Ordnance · North Sea	0	30	1	86	0.0× / 1.4
Surveys · Red Sea	0	30	1	32	0.0× / 0.2
Wrecks · Singapore Strait	0	30	1	146	— / 0
Other · Southern Ocean	0	30	1	78	— / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	0	30	1	45	0.0× / 0.4
Nav aids · Southern Ocean	0	25.6	0	—	— / 0
Surveys · South China Sea	0	25.5	0	—	0.0× / 1.4
Other · Great Australian Bight	0	21.2	0	—	— / 0
Nav aids · Coral Sea	0	14.2	0	—	0.0× / 7.6
Nav aids · Celtic Sea	0	13.6	0	—	0.0× / 1
Wrecks · Kara Sea	0	13.5	0	—	— / 0
Surveys · Bass Strait	0	11.2	0	—	0.0× / 0.6
Surveys · Gulf of Guinea	0	8.3	0	—	0.0× / 0.2
Surveys · Mediterranean Sea - Western Basin	0	8	0	—	0.0× / 1.4
Other · Mediterranean Sea - Eastern Basin	0	7.7	0	—	0.0× / 0.4
Cable ops · Yellow Sea	0	4.5	0	—	— / 0
Incidents · Ceram Sea	0	4.4	0	—	0.0× / 0.2
Other · Black Sea	0	3.4	0	—	0.0× / 0.6
Derelicts · English Channel	0	1.8	0	—	0.0× / 0.6
Exercises · Bering Sea	0	1.3	0	—	0.0× / 0.6
Incidents · Gulf of Guinea	0	0.6	0	—	— / 0
Incidents · Persian Gulf	0	0.6	0	—	— / 0

Cite: seahazards.com Sea Ledger, 2022-04, 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.