Sea Ledger, January 2020

2020-01-01 to 2020-01-31 · archive

issued: 707
warning-days in force: 10,766
in force at month end: 348
sea × type cells: 230

baseline: same month, previous 5 years (2019-01, 2018-01, 2017-01, 2016-01, 2015-01)

By type

type	issued	warning-days	in force at end
Exercises	192	1,521.1	53
Incidents	102	910.9	22
Icebergs	86	100.3	2
Nav aids	65	2,128.4	73
Surveys	61	2,327.2	74
Missiles	48	290.2	15
Quakes	40	108.4	6
Cable ops	30	363.6	13
Derelicts	25	159.4	5
Other	15	457.7	9
Debris	14	84.8	4
Wrecks	9	1,910.4	56
Spills	9	78.3	6
Piracy	4	41.8	0
Restricted	2	83.9	3
Structures	2	79.8	2
Ordnance	2	47.4	2
Storms	1	10.8	1
Volcanic	0	62	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Exercises · Mediterranean Sea - Eastern Basinsurge	45	207.7	7	37	5.5× / 8.2
Exercises · Aegean Seasurgelong running	38	329.9	12	399	4.3× / 8.8
Icebergs · Labrador Sea	31	36.5	2	32	1.1× / 28.4
Icebergs · South Atlantic Ocean	30	30	0	—	1.5× / 19.6
Icebergs · Southern Ocean	21	21.8	0	—	1.9× / 10.8
Exercises · North Pacific Ocean	18	213.5	9	65	0.8× / 23.6
Exercises · Black Sea	16	226.6	11	64	1.9× / 8.2
Surveys · South Atlantic Ocean	15	512.4	11	112	1.1× / 14
Incidents · South China Sea	14	160.1	1	48	0.5× / 28.8
Nav aids · North Atlantic Oceansurge	13	186.3	6	174	2.1× / 6.2
Missiles · North Atlantic Oceansurge	13	35.5	0	—	2.8× / 4.6
Incidents · North Atlantic Ocean	12	177.6	6	140	0.8× / 15
Incidents · North Pacific Ocean	11	158.7	1	47	0.5× / 24.4
Exercises · Arabian Sea	11	74.5	3	35	1.4× / 7.8
Exercises · South Pacific Oceansurge	11	61.5	0	—	2.9× / 3.8
Cable ops · North Atlantic Oceansurge	10	61.8	3	92	6.3× / 1.6
Exercises · South Atlantic Ocean	10	48	1	31	0.9× / 10.8
Missiles · Indian Oceansurge	10	23.5	0	—	8.3× / 1.2
Surveys · Arabian Sea	9	251.4	7	113	1.7× / 5.2
Exercises · North Atlantic Ocean	9	47.3	1	154	1.4× / 6.4
Quakes · North Pacific Ocean	9	27	0	—	2.0× / 4.6
Incidents · Bismarck Seasurge	9	26.9	0	—	3.5× / 2.6
Nav aids · South Atlantic Ocean	8	140.1	7	207	1.0× / 7.8
Exercises · Yellow Sea	8	63.1	1	35	1.2× / 6.8
Quakes · Caribbean Seasurge	8	21	0	—	13× / 0.6
Surveys · Persian Gulfsurge	7	325.1	10	248	7.0× / 1
Exercises · Bay of Bengal	7	34.2	0	—	0.8× / 8.4
Incidents · South Atlantic Ocean	7	32.4	2	36	1.5× / 4.8
Incidents · Indian Ocean	7	30	4	31	1.6× / 4.4
Surveys · North Atlantic Oceanlong running	5	274.1	9	806	1.9× / 2.6
Surveys · Indian Oceansurge	5	175.8	8	57	2.5× / 2
Nav aids · Coral Sea	5	77.7	3	220	1.3× / 3.8
Incidents · South Pacific Ocean	5	75.4	1	46	0.8× / 6.6
Other · North Atlantic Oceansurge	5	56.2	0	—	5.0× / 1
Nav aids · North Sea	5	55.5	1	68	0.3× / 15.8
Nav aids · Gulf of Mexico	5	31.4	3	191	1.6× / 3.2
Missiles · Barentsz Seasurge	5	19.7	3	18	13× / 0.4
Derelicts · North Atlantic Ocean	5	15.6	0	—	1.0× / 5.2
Quakes · South Pacific Ocean	5	12.4	1	23	0.5× / 9.8
Incidents · Coral Sea	5	4.9	0	—	1.2× / 4.2
Nav aids · South Pacific Oceansurgelong running	4	237.2	7	452	2.9× / 1.4
Surveys · Bay of Bengal	4	106.7	4	35	1.7× / 2.4
Wrecks · Persian Gulfsurge	4	85.5	4	212	10× / 0.4
Incidents · Arabian Sea	4	70.6	2	46	1.1× / 3.8
Missiles · Black Sea	4	64.6	4	32	1.0× / 4
Missiles · North Pacific Ocean	4	55.3	3	141	0.5× / 8.2
Nav aids · Great Australian Bightnew	4	51.7	2	163	new / 0
Piracy · Gulf of Guineasurge	4	41.8	0	—	2.2× / 1.8
Exercises · Mediterranean Sea - Western Basinsurge	4	40	2	29	10× / 0.4
Spills · Gulf of Mexico	4	30	3	18	0.9× / 4.6
Missiles · South Pacific Oceansurge	4	24.9	2	11	2.2× / 1.8
Debris · Celtic Seanew	4	17.6	0	—	new / 0
Derelicts · Arabian Seasurge	4	17.3	2	47	5.0× / 0.8
Derelicts · Tasman Seasurge	4	12	0	—	3.3× / 1.2
Incidents · Tasman Seasurge	4	3	0	—	2.5× / 1.6
Nav aids · North Pacific Ocean	3	136.2	4	339	0.8× / 4
Nav aids · Indian Ocean	3	117.4	3	302	1.4× / 2.2
Surveys · Mediterranean Sea - Eastern Basin	3	96.9	5	77	0.9× / 3.4
Exercises · Laccadive Sea	3	36.6	1	31	1.5× / 2
Cable ops · Persian Gulfsurge	3	18.7	1	19	3.8× / 0.8
Cable ops · Mediterranean Sea - Western Basinsurge	3	18.5	1	18	3.8× / 0.8
Missiles · South Atlantic Oceansurge	3	16.4	1	20	15× / 0.2
Exercises · Indian Ocean	3	15.6	0	—	1.5× / 2
Incidents · Banda Seasurge	3	15.1	0	—	7.5× / 0.4
Exercises · Andaman or Burma Seanew	3	10.8	0	—	new / 0
Incidents · Philippine Sea	3	10.7	1	29	0.4× / 8.4
Cable ops · North Seasurge	3	10.4	0	—	2.1× / 1.4
Quakes · South Atlantic Oceansurge	3	9	0	—	7.5× / 0.4
Derelicts · Caribbean Sea	3	6.7	0	—	1.4× / 2.2
Quakes · Mediterranean Sea - Eastern Basinnew	3	6.5	2	3	new / 0
Derelicts · Bay of Bengal	3	6	0	—	1.7× / 1.8
Other · Bering Seanew	3	3.8	0	—	new / 0
Nav aids · Caribbean Sealong running	2	309.6	11	724	1.0× / 2
Surveys · Caribbean Sea	2	52.3	2	84	3.3× / 0.6
Surveys · South Pacific Ocean	2	48.7	1	121	5.0× / 0.4
Cable ops · South Pacific Ocean	2	44.8	1	74	2.0× / 1
Debris · North Atlantic Ocean	2	32.5	2	63	2.0× / 1
Other · South Atlantic Ocean	2	28.4	0	—	10× / 0.2
Nav aids · Bering Seanew	2	20.1	2	10	new / 0
Surveys · Great Australian Bightnew	2	16.9	1	16	new / 0
Spills · North Pacific Ocean	2	15.3	2	45	0.7× / 2.8
Cable ops · Arabian Sea	2	15	1	29	1.4× / 1.4
Derelicts · Celtic Seanew	2	13.7	1	10	new / 0
Incidents · Laccadive Sea	2	13.3	1	10	1.7× / 1.2
Cable ops · Irish Sea and St. George's Channel	2	12.6	1	29	10× / 0.2
Missiles · Japan Sea	2	10.5	1	9	3.3× / 0.6
Nav aids · Tasman Sea	2	6.8	1	12	3.3× / 0.6
Cable ops · Coral Seanew	2	6.5	0	—	new / 0
Nav aids · Celtic Sea	2	6.4	0	—	2.0× / 1
Icebergs · Barentsz Seanew	2	6	0	—	new / 0
Icebergs · Kara Seanew	2	6	0	—	new / 0
Quakes · North Atlantic Ocean	2	6	0	—	10× / 0.2
Quakes · Solomon Sea	2	5.4	1	4	1.1× / 1.8
Quakes · Molukka Sea	2	5	1	12	2.5× / 0.8
Missiles · Philippine Sea	2	4.4	0	—	1.1× / 1.8
Quakes · Bismarck Sea	2	4.1	1	24	1.3× / 1.6
Debris · English Channel	2	3.1	1	18	3.3× / 0.6
Wrecks · South China Sealong running	1	694.3	18	389	0.7× / 1.4
Surveys · South China Sea	1	86	3	150	new / 0
Nav aids · Arabian Sea	1	83	3	304	0.6× / 1.6
Nav aids · Bass Strait	1	81.6	2	310	1.3× / 0.8
Surveys · Mediterranean Sea - Western Basin	1	74.5	2	114	new / 0
Wrecks · Arabian Sea	1	68.1	2	206	1.7× / 0.6
Nav aids · Inner Seas off the West Coast of Scotland	1	62.4	3	50	0.3× / 3
Nav aids · English Channel	1	40.9	1	95	0.3× / 3.6
Ordnance · North Sea	1	40.7	2	109	1.0× / 1
Restricted · Persian Gulf	1	39.4	2	289	new / 0
Cable ops · South Atlantic Ocean	1	38.6	2	53	0.3× / 3.6
Other · South China Sea	1	31.6	0	—	1.3× / 0.8
Surveys · Bass Strait	1	31	1	31	5.0× / 0.2
Structures · Sea of Okhotsk	1	31	1	91	new / 0
Restricted · South Atlantic Oceanlong running	1	31	1	395	2.5× / 0.4
Incidents · Mozambique Channel	1	29.6	0	—	0.6× / 1.8
Other · North Pacific Ocean	1	28.6	0	—	1.0× / 1
Wrecks · Mediterranean Sea - Eastern Basin	1	23.4	1	23	new / 0
Incidents · Halmahera Sea	1	23.1	0	—	new / 0
Wrecks · Gulf of Thailand	1	20.5	1	20	new / 0
Derelicts · South China Sea	1	18.4	0	—	0.4× / 2.6
Surveys · Sea of Marmara	1	18.2	1	18	new / 0
Debris · South Atlantic Ocean	1	16.6	0	—	new / 0
Surveys · Gulf of Mexico	1	16	1	57	5.0× / 0.2
Incidents · Adriatic Sea	1	15.9	0	—	new / 0
Surveys · Timor Sea	1	15.2	0	—	new / 0
Spills · Bering Sea	1	14	0	—	new / 0
Spills · Gulf of Alaska	1	14	0	—	5.0× / 0.2
Storms · South Pacific Ocean	1	10.8	1	10	5.0× / 0.2
Nav aids · Mediterranean Sea - Western Basin	1	10.4	1	10	0.5× / 2
Surveys · Gulf of Guinea	1	9	1	8	5.0× / 0.2
Incidents · Java Sea	1	8.9	1	32	0.6× / 1.6
Cable ops · Tasman Sea	1	8.4	0	—	1.7× / 0.6
Incidents · Gulf of Aden	1	7.9	1	7	new / 0
Incidents · Malacca Strait	1	6.9	0	—	5.0× / 0.2
Cable ops · Eastern China Sea	1	6.8	0	—	0.7× / 1.4
Ordnance · North Pacific Ocean	1	6.7	0	—	1.7× / 0.6
Exercises · Red Sea	1	6.6	0	—	new / 0
Incidents · Bay of Bengal	1	6	1	5	1.7× / 0.6
Exercises · South China Sea	1	5.5	0	—	0.4× / 2.8
Spills · North Atlantic Ocean	1	5	1	5	0.5× / 2
Missiles · Laccadive Sea	1	4.4	0	—	0.6× / 1.6
Incidents · Gulf of Thailand	1	4.1	0	—	1.3× / 0.8
Debris · Andaman or Burma Sea	1	3	0	—	new / 0
Debris · Arafura Sea	1	3	0	—	new / 0
Other · Arafura Sea	1	3	0	—	5.0× / 0.2
Quakes · Banda Sea	1	3	0	—	1.7× / 0.6
Quakes · Bering Sea	1	3	0	—	2.5× / 0.4
Debris · Coral Sea	1	3	0	—	2.5× / 0.4
Derelicts · Gulf of Mexico	1	3	0	—	1.0× / 1
Debris · Indian Ocean	1	3	1	2	5.0× / 0.2
Quakes · Indian Ocean	1	3	0	—	0.5× / 2.2
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	new / 0
Debris · South Pacific Ocean	1	3	0	—	2.5× / 0.4
Quakes · Timor Sea	1	3	0	—	new / 0
Incidents · Arafura Sea	1	2.8	0	—	1.0× / 1
Incidents · Black Sea	1	2.8	0	—	new / 0
Exercises · Japan Sea	1	2.6	1	2	1.7× / 0.6
Incidents · Molukka Sea	1	2.6	0	—	new / 0
Exercises · Coral Sea	1	2.1	0	—	2.5× / 0.4
Exercises · Bering Sea	1	1.9	0	—	5.0× / 0.2
Wrecks · South Pacific Ocean	1	1.8	1	1	1.0× / 1
Other · Mediterranean Sea - Eastern Basin	1	1.7	0	—	1.3× / 0.8
Other · Celtic Sea	1	1.3	0	—	5.0× / 0.2
Structures · South Atlantic Ocean	1	1.3	0	—	1.7× / 0.6
Derelicts · Laccadive Sea	1	1.1	1	1	1.3× / 0.8
Incidents · Mediterranean Sea - Eastern Basin	1	1	0	—	0.1× / 19.8
Incidents · Celebes Sea	1	0.8	0	—	new / 0
Nav aids · Strait of Gibraltar	1	0.8	0	—	1.7× / 0.6
Incidents · Gulf of Mexico	1	0.3	0	—	0.3× / 3.2
Incidents · Southern Ocean	1	0.3	0	—	new / 0
Nav aids · Gulf of Alaska	1	0.2	0	—	0.4× / 2.6
Exercises · Caribbean Sea	1	0.1	1	0	0.4× / 2.6
Incidents · Caribbean Sea	1	0.1	0	—	0.3× / 4
Wrecks · Caribbean Sealong running	0	248	8	1,096	0.0× / 1.4
Wrecks · North Atlantic Oceanlong running	0	217	7	820	0.0× / 0.6
Other · Caribbean Sealong running	0	186	6	1,106	0.0× / 1
Wrecks · North Pacific Oceanlong running	0	124	4	959	— / 0
Exercises · Ionian Sealong running	0	93	3	399	0.0× / 1.8
Nav aids · Philippine Sea	0	93	3	331	0.0× / 0.2
Other · Arabian Sealong running	0	62	2	369	0.0× / 0.6
Wrecks · Gulf of Mexicolong running	0	62	2	1,051	— / 0
Surveys · Tasman Sea	0	62	2	58	0.0× / 0.4
Nav aids · Persian Gulf	0	50.7	1	79	0.0× / 0.2
Structures · South China Sealong running	0	47.5	1	627	— / 0
Nav aids · Mediterranean Sea - Eastern Basin	0	44.5	1	212	0.0× / 0.2
Nav aids · Mozambique Channel	0	35.3	1	330	— / 0
Wrecks · South Atlantic Ocean	0	34.6	1	43	0.0× / 0.2
Wrecks · Laccadive Sea	0	33.1	0	—	— / 0
Cable ops · Aegean Sea	0	31	1	71	0.0× / 0.2
Nav aids · Aegean Sea	0	31	1	304	— / 0
Missiles · Aegean Sealong running	0	31	1	399	0.0× / 0.6
Nav aids · Andaman or Burma Sea	0	31	1	246	0.0× / 0.4
Nav aids · Arafura Sea	0	31	1	150	0.0× / 0.6
Surveys · Arctic Ocean	0	31	1	113	— / 0
Surveys · Beaufort Sea	0	31	1	58	— / 0
Surveys · Bering Sea	0	31	1	145	— / 0
Other · Black Sea	0	31	1	94	0.0× / 0.2
Surveys · Black Sea	0	31	1	45	0.0× / 0.2
Wrecks · Great Australian Bight	0	31	1	235	— / 0
Wrecks · Gulf of Californialong running	0	31	1	472	— / 0
Wrecks · Gulf of Guinea	0	31	1	121	— / 0
Nav aids · Gulf of Thailand	0	31	1	106	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2020-01, 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.