Sea Ledger, January 2018

2018-01-01 to 2018-01-31 · archive

issued: 723
warning-days in force: 14,038
in force at month end: 488
sea × type cells: 243

baseline: same month, previous 5 years (2017-01, 2016-01, 2015-01, 2014-01, 2013-01)

By type

type	issued	warning-days	in force at end
Incidents	180	1,956.3	69
Exercises	132	1,215.6	41
Icebergs	87	93.9	5
Nav aids	86	4,042.3	129
Surveys	65	2,379.5	84
Quakes	35	122.7	5
Derelicts	32	181.1	5
Missiles	30	209.4	11
Cable ops	18	200.5	11
Spills	18	202	13
Other	16	618.9	23
Containers	9	21.7	1
Wrecks	7	2,235.6	73
Debris	4	12	0
Piracy	3	19.6	1
Ordnance	1	155	5
Restricted	0	124	4
Volcanic	0	155	5
Structures	0	31	1
Storms	0	62	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · South China Seasurge	49	552.6	14	163	2.4× / 20.2
Icebergs · Labrador Sea	31	36.4	2	32	1.4× / 22.2
Incidents · Mediterranean Sea - Eastern Basinsurge	30	409.3	19	48	2.2× / 13.8
Icebergs · South Atlantic Oceansurge	29	28.5	2	31	3.1× / 9.2
Exercises · North Pacific Ocean	27	187.7	8	35	1.5× / 17.8
Icebergs · Southern Oceansurge	27	29	1	31	14× / 2
Incidents · North Pacific Ocean	22	256.1	6	159	0.8× / 26.6
Surveys · South Atlantic Oceansurge	21	319.3	13	111	2.6× / 8
Nav aids · North Sea	15	221.9	7	210	0.8× / 19.4
Surveys · Mediterranean Sea - Eastern Basinsurge	11	137	5	77	14× / 0.8
Exercises · South Atlantic Ocean	11	55.7	1	33	1.0× / 10.6
Exercises · Mediterranean Sea - Eastern Basinsurge	11	43.2	1	30	2.1× / 5.2
Exercises · Philippine Seasurge	11	10.7	1	29	7.9× / 1.4
Surveys · Arabian Seasurge	10	228	9	86	4.2× / 2.4
Exercises · Black Sea	10	120.7	2	41	1.5× / 6.8
Exercises · Bay of Bengal	10	101.7	3	35	1.3× / 7.6
Exercises · Arabian Sea	10	64.1	2	35	1.5× / 6.6
Exercises · North Atlantic Oceansurge	10	60.8	3	126	2.3× / 4.4
Incidents · North Atlantic Ocean	9	166.2	5	46	0.4× / 21
Spills · Gulf of Mexicosurge	9	107	6	41	2.8× / 3.2
Quakes · North Pacific Oceansurge	9	21.5	1	22	2.4× / 3.8
Nav aids · North Atlantic Ocean	8	459.7	14	341	1.8× / 4.4
Nav aids · Gulf of Mexicosurge	8	188.5	6	362	4.4× / 1.8
Incidents · Indian Ocean	8	53.8	1	209	1.3× / 6
Missiles · North Atlantic Oceansurge	8	39.4	3	31	2.1× / 3.8
Exercises · Aegean Sealong running	7	327.7	12	395	0.9× / 8
Incidents · Gulf of Mexico	7	134	5	43	1.8× / 3.8
Exercises · South Pacific Ocean	7	26.3	2	30	1.9× / 3.6
Quakes · South Pacific Ocean	7	20.3	1	33	0.8× / 8.6
Missiles · North Pacific Ocean	6	70.4	2	152	1.1× / 5.4
Incidents · South Atlantic Ocean	6	52.7	2	43	0.9× / 6.8
Derelicts · South China Seasurgelong running	6	42.7	1	376	3.3× / 1.8
Nav aids · Gulf of Alaskasurge	6	17.2	1	26	6.0× / 1
Surveys · North Atlantic Oceansurgelong running	5	267.6	10	713	4.2× / 1.2
Incidents · Mozambique Channel	5	63.3	3	37	1.9× / 2.6
Spills · North Pacific Oceansurge	5	45	5	13	2.8× / 1.8
Derelicts · South Pacific Ocean	5	40.8	2	33	1.7× / 3
Surveys · Aegean Seanew	5	21.2	0	—	new / 0
Nav aids · English Channel	5	18.8	1	22	1.5× / 3.4
Nav aids · Caribbean Seasurge	4	559.1	16	342	10× / 0.4
Nav aids · South Atlantic Ocean	4	506.2	16	149	0.5× / 7.6
Nav aids · South Pacific Oceansurgelong running	4	256.5	8	513	6.7× / 0.6
Nav aids · Coral Sealong running	4	227	9	1,384	1.3× / 3
Nav aids · Arabian Seasurge	4	188.7	6	279	10× / 0.4
Nav aids · North Pacific Ocean	4	160.7	5	104	1.7× / 2.4
Incidents · South Pacific Ocean	4	35.1	1	44	0.8× / 5.2
Incidents · Caribbean Sea	4	29.5	2	41	1.0× / 4
Incidents · Coral Sea	4	16.1	1	25	1.3× / 3.2
Missiles · Indian Oceansurge	4	16.1	0	—	6.7× / 0.6
Derelicts · Coral Seasurge	4	12	0	—	4.0× / 1
Incidents · Bismarck Sea	4	9.3	1	21	1.3× / 3.2
Surveys · Bay of Bengalsurgelong running	3	96.8	4	572	2.5× / 1.2
Nav aids · Inner Seas off the West Coast of Scotland	3	89.2	2	135	1.0× / 3
Wrecks · English Channelsurge	3	72.9	3	55	5.0× / 0.6
Cable ops · South Atlantic Ocean	3	33.4	2	34	0.1× / 24
Cable ops · North Atlantic Ocean	3	31.5	2	21	1.5× / 2
Cable ops · Mediterranean Sea - Eastern Basin	3	27.5	1	38	1.9× / 1.6
Other · South Pacific Oceansurge	3	18.8	3	15	5.0× / 0.6
Missiles · Japan Seanew	3	18.5	2	16	new / 0
Cable ops · Strait of Gibraltarsurge	3	18.2	1	17	3.0× / 1
Incidents · Philippine Sea	3	16.8	1	29	0.4× / 8
Exercises · Yellow Sea	3	15.8	0	—	0.3× / 10.6
Exercises · Sea of Azovnew	3	10.5	2	7	new / 0
Quakes · Bismarck Seasurge	3	10	0	—	5.0× / 0.6
Missiles · Laccadive Seasurge	3	9.9	1	19	2.5× / 1.2
Missiles · Philippine Seasurge	3	8.4	1	19	3.0× / 1
Derelicts · North Pacific Ocean	3	8.3	1	19	1.3× / 2.4
Incidents · Japan Seasurge	3	7	1	7	15× / 0.2
Incidents · Solomon Seasurge	3	5.1	1	24	7.5× / 0.4
Containers · Coral Seasurge	3	5	0	—	15× / 0.2
Nav aids · Irish Sea and St. George's Channel	3	1.5	0	—	1.5× / 2
Other · South China Sealong running	2	77	2	1,162	5.0× / 0.4
Nav aids · Celtic Sea	2	38.5	1	36	1.7× / 1.2
Incidents · Ionian Sea	2	37.2	1	21	3.3× / 0.6
Exercises · Laccadive Sea	2	36.1	1	34	1.3× / 1.6
Other · Mediterranean Sea - Eastern Basin	2	34.6	0	—	5.0× / 0.4
Spills · North Atlantic Ocean	2	22	2	13	1.1× / 1.8
Derelicts · South Atlantic Ocean	2	20.6	1	20	0.9× / 2.2
Incidents · Arabian Sea	2	20.1	0	—	1.0× / 2
Surveys · Andaman or Burma Sea	2	19.5	1	19	10× / 0.2
Exercises · Caribbean Sea	2	18.4	0	—	0.9× / 2.2
Derelicts · Arabian Seanew	2	17.9	0	—	new / 0
Surveys · Southern Ocean	2	16.8	1	16	1.3× / 1.6
Incidents · Eastern China Sea	2	14.8	1	44	5.0× / 0.4
Exercises · Indian Ocean	2	10.9	0	—	1.7× / 1.2
Missiles · Arabian Sea	2	10.4	1	6	2.5× / 0.8
Piracy · Gulf of Guinea	2	9.6	1	7	3.3× / 0.6
Incidents · Java Sea	2	9.6	1	10	1.4× / 1.4
Incidents · Flores Sea	2	8.1	0	—	10× / 0.2
Derelicts · Indian Ocean	2	7.8	0	—	0.6× / 3.2
Derelicts · Philippine Sea	2	7.6	0	—	1.7× / 1.2
Derelicts · Arafura Sea	2	6	0	—	3.3× / 0.6
Quakes · Gulf of Alaska	2	6	0	—	10× / 0.2
Debris · North Atlantic Ocean	2	6	0	—	2.0× / 1
Containers · North Pacific Ocean	2	6	0	—	5.0× / 0.4
Quakes · South Atlantic Oceannew	2	6	0	—	new / 0
Exercises · Baltic Sea	2	3.5	0	—	1.7× / 1.2
Containers · North Atlantic Ocean	2	3.3	0	—	1.4× / 1.4
Quakes · Caribbean Sea	2	3.2	0	—	10× / 0.2
Quakes · Coral Sea	2	3.2	1	18	0.8× / 2.4
Incidents · Mediterranean Sea - Western Basin	2	2.5	2	1	2.5× / 0.8
Nav aids · Strait of Gibraltarnew	2	2.4	0	—	new / 0
Other · Tasman Sea	2	1	2	0	5.0× / 0.4
Incidents · Tasman Sea	2	0.3	0	—	1.7× / 1.2
Incidents · Great Australian Bight	2	0.2	0	—	5.0× / 0.4
Wrecks · South China Sealong running	1	579.5	19	1,360	new / 0
Nav aids · Tasman Sealong running	1	124.4	4	610	2.5× / 0.4
Surveys · Persian Gulf	1	81.8	3	54	5.0× / 0.2
Surveys · Indian Oceanlong running	1	76.5	3	433	0.6× / 1.6
Nav aids · South China Sea	1	69.3	2	77	new / 0
Ordnance · North Sea	1	62	2	55	1.3× / 0.8
Surveys · Tasman Sea	1	47.1	2	65	1.3× / 0.8
Nav aids · Laccadive Sea	1	40.4	2	120	5.0× / 0.2
Nav aids · Ionian Sea	1	33.5	1	244	new / 0
Other · North Atlantic Ocean	1	32.5	1	205	0.8× / 1.2
Surveys · South Pacific Ocean	1	32	1	40	new / 0
Nav aids · Bass Straitlong running	1	31.2	1	1,005	2.5× / 0.4
Nav aids · Arafura Sealong running	1	31.1	1	587	2.5× / 0.4
Cable ops · Black Sea	1	31	1	104	2.5× / 0.4
Other · Gulf of Mexico	1	28.8	1	43	5.0× / 0.2
Other · English Channel	1	28.6	1	28	1.0× / 1
Cable ops · South Pacific Ocean	1	27.2	1	42	5.0× / 0.2
Surveys · Gulf of Mexico	1	25.8	1	47	new / 0
Nav aids · East Siberian Sea	1	19.5	1	19	new / 0
Wrecks · Bay of Bengal	1	19.1	1	19	new / 0
Other · North Sea	1	17.5	1	17	0.5× / 2.2
Wrecks · Philippine Sea	1	15.4	1	15	new / 0
Spills · Eastern China Sea	1	14	0	—	new / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	1.7× / 0.6
Cable ops · Persian Gulf	1	12.3	1	12	1.0× / 1
Wrecks · Inner Seas off the West Coast of Scotland	1	11.5	1	11	new / 0
Cable ops · North Sea	1	11.2	0	—	0.6× / 1.6
Exercises · Gulf of Mexico	1	10.6	0	—	1.0× / 1
Exercises · Coral Sea	1	10.2	0	—	1.7× / 0.6
Piracy · Makassar Strait	1	10	0	—	new / 0
Nav aids · Gulf of Thailand	1	7.8	1	7	new / 0
Surveys · Inner Seas off the West Coast of Scotland	1	7.4	0	—	5.0× / 0.2
Exercises · Japan Sea	1	7	0	—	new / 0
Missiles · Southern Ocean	1	5.3	0	—	new / 0
Cable ops · South China Sea	1	4.5	1	4	0.4× / 2.6
Other · Bay of Biscay	1	4.1	0	—	new / 0
Cable ops · Celtic Sea	1	3.7	1	3	2.5× / 0.4
Derelicts · Laccadive Sea	1	3.5	0	—	new / 0
Quakes · Arafura Sea	1	3	0	—	5.0× / 0.2
Derelicts · Bay of Bengal	1	3	0	—	0.5× / 2.2
Quakes · Bay of Bengal	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	5.0× / 0.2
Quakes · Gulf of California	1	3	0	—	5.0× / 0.2
Quakes · Indian Ocean	1	3	0	—	0.6× / 1.6
Derelicts · North Atlantic Ocean	1	3	0	—	0.2× / 5
Debris · North Pacific Ocean	1	3	0	—	1.3× / 0.8
Quakes · Philippine Sea	1	3	0	—	0.8× / 1.2
Other · Savu Sea	1	3	0	—	new / 0
Quakes · Sea of Okhotsk	1	3	0	—	new / 0
Debris · South Pacific Ocean	1	3	0	—	5.0× / 0.2
Derelicts · Tasman Sea	1	3	0	—	1.0× / 1
Nav aids · Andaman or Burma Sea	1	2.9	0	—	5.0× / 0.2
Incidents · Bering Sea	1	2.9	1	2	new / 0
Containers · Baltic Sea	1	2.6	1	2	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	2.3	0	—	0.8× / 1.2
Exercises · Celtic Sea	1	1	0	—	new / 0
Other · Celtic Sea	1	1	0	—	new / 0
Containers · English Channel	1	0.9	0	—	new / 0
Incidents · Davis Strait	1	0.7	0	—	5.0× / 0.2
Quakes · Solomon Sea	1	0.5	1	0	0.6× / 1.6
Incidents · Persian Gulf	1	0.1	0	—	5.0× / 0.2
Wrecks · Caribbean Sealong running	0	372	12	380	0.0× / 1.6
Surveys · Arctic Oceanlong running	0	186	6	1,289	— / 0
Surveys · Beaufort Sealong running	0	155	5	1,950	— / 0
Other · Caribbean Sealong running	0	155	5	376	0.0× / 1
Wrecks · North Sea	0	155	5	308	0.0× / 1
Surveys · The Northwestern Passageslong running	0	155	5	2,004	— / 0
Wrecks · Arabian Sealong running	0	133.3	4	468	— / 0
Other · Coral Sealong running	0	124	4	1,022	0.0× / 0.4
Nav aids · Indian Oceanlong running	0	124	4	934	0.0× / 3.2
Surveys · Bering Sea	0	93	3	204	— / 0
Wrecks · Gulf of Mexico	0	93	3	321	— / 0
Exercises · Ionian Sea	0	93	3	35	0.0× / 2.4
Wrecks · North Atlantic Oceanlong running	0	93	3	366	0.0× / 0.2
Wrecks · North Pacific Ocean	0	93	3	286	0.0× / 0.2
Volcanic · Philippine Sealong running	0	93	3	2,103	0.0× / 0.2
Wrecks · Laccadive Sea	0	66.7	2	236	— / 0
Nav aids · Bay of Bengal	0	62	2	292	0.0× / 0.4
Ordnance · Black Sealong running	0	62	2	393	0.0× / 0.2
Surveys · Black Sea	0	62	2	50	0.0× / 0.4
Storms · Caribbean Sea	0	62	2	141	— / 0
Nav aids · Gulf of California	0	62	2	95	— / 0
Surveys · Hudson Strait	0	62	2	117	— / 0
Nav aids · Malacca Straitlong running	0	62	2	828	— / 0
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	62	2	660	0.0× / 0.4
Nav aids · Singapore Straitlong running	0	62	2	783	0.0× / 0.2
Surveys · South China Sea	0	62	2	65	— / 0
Wrecks · South Pacific Ocean	0	62	2	128	0.0× / 1.2
Wrecks · The Northwestern Passages	0	62	2	158	— / 0
Wrecks · Irish Sea and St. George's Channellong running	0	61.7	1	387	0.0× / 0.4
Surveys · Caribbean Sealong running	0	58	1	384	0.0× / 0.6
Surveys · Gulf of Guinea	0	45.7	1	119	— / 0
Wrecks · South Atlantic Ocean	0	35.5	1	168	0.0× / 0.6
Missiles · Aegean Sea	0	31	1	35	0.0× / 1
Wrecks · Andaman or Burma Sealong running	0	31	1	390	0.0× / 0.6

Cite: seahazards.com Sea Ledger, 2018-01, 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.