Sea Ledger, February 2018

2018-02-01 to 2018-02-28 · archive

issued: 652
warning-days in force: 12,725
in force at month end: 478
sea × type cells: 253

baseline: same month, previous 5 years (2017-02, 2016-02, 2015-02, 2014-02, 2013-02)

By type

type	issued	warning-days	in force at end
Incidents	150	1,603	70
Exercises	101	1,026.8	39
Icebergs	78	90.8	3
Nav aids	68	3,558.2	137
Surveys	53	2,098.4	70
Derelicts	52	223.2	6
Quakes	31	126.9	5
Missiles	21	293.2	8
Cable ops	18	313.7	13
Spills	16	255	7
Wrecks	14	2,005.7	77
Piracy	13	75.5	6
Other	12	514.5	16
Debris	11	24.2	2
Restricted	7	128.6	5
Ordnance	5	157.3	6
Containers	2	6.4	0
Volcanic	0	140	5
Structures	0	28	1
Storms	0	56	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · South Atlantic Oceansurge	27	29.4	1	28	7.9× / 3.4
Incidents · North Pacific Ocean	25	289.4	14	187	1.1× / 21.8
Icebergs · Labrador Sea	25	30	1	29	1.0× / 25.8
Incidents · South China Sea	24	327.2	14	191	1.1× / 21.4
Derelicts · North Atlantic Oceansurge	22	31.6	0	—	3.9× / 5.6
Icebergs · Southern Oceansurge	21	23.6	0	—	2.9× / 7.2
Surveys · South Atlantic Oceansurge	20	304.7	6	139	2.0× / 10
Incidents · North Atlantic Ocean	17	118.8	6	45	1.1× / 15.2
Exercises · North Pacific Ocean	15	118.9	5	35	0.7× / 20.8
Exercises · Mediterranean Sea - Eastern Basinsurge	14	88.3	4	33	2.6× / 5.4
Exercises · Black Sea	14	62.9	5	32	1.8× / 7.6
Exercises · Bay of Bengal	12	79.5	3	63	1.6× / 7.6
Incidents · Mediterranean Sea - Eastern Basin	11	259.1	10	76	0.9× / 11.8
Nav aids · North Sea	11	212	9	238	0.7× / 15
Nav aids · South Atlantic Ocean	10	506	20	177	1.6× / 6.2
Piracy · Gulf of Guineasurge	10	55.4	5	32	4.2× / 2.4
Incidents · Gulf of Mexicosurge	8	119.9	5	46	2.5× / 3.2
Incidents · Philippine Sea	8	51.6	3	37	1.2× / 6.8
Quakes · North Pacific Oceansurge	8	26.7	0	—	2.1× / 3.8
Quakes · South Pacific Ocean	8	24.4	1	29	1.1× / 7
Incidents · Bismarck Seasurge	8	22	0	—	5.7× / 1.4
Derelicts · Bay of Biscaysurge	8	7.2	0	—	40× / 0.2
Spills · Gulf of Mexico	7	124	3	41	1.7× / 4.2
Incidents · Caribbean Sea	7	81.3	5	35	1.8× / 4
Incidents · Arabian Seasurge	7	73.5	5	27	2.3× / 3
Exercises · South Atlantic Ocean	7	26.7	2	30	1.8× / 3.8
Incidents · South Atlantic Ocean	7	20.7	2	43	1.2× / 6
Incidents · Coral Sea	7	19.1	1	43	1.5× / 4.8
Nav aids · Caribbean Seasurge	6	481.8	18	281	4.3× / 1.4
Nav aids · Tasman Seasurgelong running	6	67.5	3	638	3.8× / 1.6
Incidents · Indian Ocean	6	1.3	0	—	1.2× / 5
Wrecks · Caribbean Seasurgelong running	5	372.5	17	408	8.3× / 0.6
Exercises · Aegean Sea	5	312.3	11	63	1.7× / 3
Surveys · Mediterranean Sea - Eastern Basinsurge	5	102.1	3	105	5.0× / 1
Ordnance · North Seasurge	5	73.3	3	67	13× / 0.4
Spills · North Atlantic Oceansurge	5	63	2	41	2.5× / 2
Exercises · Arabian Sea	5	61	1	33	0.8× / 6.6
Derelicts · South Pacific Oceansurge	5	42.2	1	28	2.3× / 2.2
Exercises · South Pacific Ocean	5	20.1	0	—	1.8× / 2.8
Icebergs · North Atlantic Oceansurge	5	7.8	1	6	5.0× / 1
Surveys · North Atlantic Oceanlong running	4	311.8	11	741	1.4× / 2.8
Surveys · Arabian Sea	4	133.9	6	114	1.7× / 2.4
Missiles · Black Sea	4	110.9	0	—	1.7× / 2.4
Exercises · North Atlantic Ocean	4	69.5	2	63	0.5× / 7.4
Incidents · Eastern China Seasurge	4	47.9	2	37	20× / 0.2
Missiles · North Pacific Ocean	4	43.3	2	180	1.1× / 3.8
Restricted · Mediterranean Sea - Eastern Basinnew	4	28.5	1	23	new / 0
Exercises · Yellow Sea	4	15.8	0	—	0.4× / 9.8
Other · Tasman Seanew	4	15.6	0	—	new / 0
Quakes · Philippine Seasurge	4	12	0	—	3.3× / 1.2
Nav aids · Gulf of Mexicolong running	3	181.1	9	390	1.4× / 2.2
Wrecks · South Pacific Oceansurge	3	116.8	5	156	5.0× / 0.6
Surveys · Bay of Bengalsurgelong running	3	103.1	3	600	3.0× / 1
Nav aids · Bay of Bengalsurge	3	61.8	4	320	3.8× / 0.8
Cable ops · North Atlantic Oceansurge	3	54.7	3	48	2.5× / 1.2
Other · English Channelsurge	3	50.4	3	56	15× / 0.2
Derelicts · Caribbean Seasurge	3	36	0	—	2.5× / 1.2
Missiles · Japan Seasurge	3	35.3	1	34	7.5× / 0.4
Other · North Pacific Oceansurge	3	18.4	0	—	5.0× / 0.6
Missiles · Philippine Seanew	3	12.5	0	—	new / 0
Incidents · South Pacific Ocean	3	12.1	0	—	0.5× / 5.8
Surveys · Southern Ocean	3	10.2	0	—	1.1× / 2.6
Quakes · Southern Oceansurge	3	7.3	1	26	2.1× / 1.4
Derelicts · Bay of Bengalsurge	3	7	0	—	15× / 0.2
Debris · Coral Seasurge	3	7	0	—	15× / 0.2
Exercises · Philippine Sea	3	6.3	0	—	0.9× / 3.4
Nav aids · North Atlantic Oceanlong running	2	382.6	12	369	0.4× / 4.6
Nav aids · South Pacific Oceanlong running	2	236.6	9	541	2.0× / 1
Nav aids · Coral Sealong running	2	223.3	7	1,412	0.7× / 2.8
Nav aids · North Pacific Ocean	2	146.2	6	123	0.8× / 2.6
Wrecks · North Sea	2	146.2	6	336	2.5× / 0.8
Nav aids · Arabian Seanew	2	136	5	307	new / 0
Wrecks · Arabian Sealong running	2	96	3	496	1.7× / 1.2
Surveys · Gulf of Guinea	2	67.1	3	147	10× / 0.2
Surveys · Black Sea	2	61.1	3	78	5.0× / 0.4
Surveys · Indian Oceanlong running	2	58.6	3	461	5.0× / 0.4
Nav aids · Inner Seas off the West Coast of Scotland	2	57	2	163	0.5× / 3.8
Spills · North Pacific Ocean	2	51	1	41	2.0× / 1
Missiles · North Atlantic Ocean	2	33.9	1	39	0.4× / 5.2
Derelicts · South Atlantic Ocean	2	32.3	2	44	1.7× / 1.2
Nav aids · English Channel	2	32.2	2	30	0.8× / 2.4
Surveys · Gulf of Mexico	2	31.7	1	50	1.7× / 1.2
Nav aids · Mediterranean Sea - Western Basin	2	30.5	2	69	1.7× / 1.2
Nav aids · Gulf of Alaska	2	27.5	0	—	2.5× / 0.8
Surveys · Tasman Sea	2	25.8	1	93	10× / 0.2
Cable ops · Philippine Sea	2	21.5	2	21	1.4× / 1.4
Exercises · South China Sea	2	13	2	7	1.0× / 2
Exercises · Gulf of Mexico	2	10	0	—	0.6× / 3.2
Exercises · Baltic Sea	2	6.5	0	—	1.1× / 1.8
Exercises · Indian Ocean	2	6	0	—	1.7× / 1.2
Derelicts · Mediterranean Sea - Western Basinnew	2	6	0	—	new / 0
Debris · North Atlantic Ocean	2	6	0	—	3.3× / 0.6
Exercises · Celtic Seanew	2	3.8	0	—	new / 0
Wrecks · English Channel	1	86.7	3	41	5.0× / 0.2
Nav aids · Indian Oceanlong running	1	85.3	3	962	0.5× / 2
Nav aids · South China Sea	1	63.2	2	105	new / 0
Surveys · South China Sea	1	60.2	2	77	new / 0
Nav aids · Kara Sea	1	51.4	2	161	new / 0
Cable ops · South Atlantic Ocean	1	45.1	2	62	0.1× / 21.6
Other · South Pacific Ocean	1	42.9	0	—	5.0× / 0.2
Incidents · Mozambique Channel	1	36.9	0	—	0.6× / 1.8
Nav aids · Laccadive Sea	1	35	1	148	1.7× / 0.6
Derelicts · South China Sealong running	1	31	1	404	new / 0
Nav aids · Black Sea	1	30.4	2	83	new / 0
Restricted · Black Sealong running	1	30.4	2	1,729	new / 0
Exercises · Laccadive Sea	1	29	1	30	0.4× / 2.4
Nav aids · Bristol Channel	1	28	1	286	0.8× / 1.2
Incidents · Japan Sea	1	26.4	1	29	1.3× / 0.8
Cable ops · South Pacific Ocean	1	25.4	1	44	1.0× / 1
Cable ops · Java Sea	1	24.3	1	24	new / 0
Nav aids · Celtic Sea	1	23.2	1	64	0.5× / 2
Nav aids · Great Australian Bightlong running	1	21.3	1	819	0.6× / 1.6
Missiles · South China Sea	1	16.5	1	16	new / 0
Derelicts · Tasman Sea	1	15.9	1	15	1.0× / 1
Cable ops · Arabian Sea	1	15.4	0	—	0.5× / 2
Spills · South Pacific Ocean	1	14	0	—	new / 0
Incidents · Solomon Sea	1	13.5	0	—	1.3× / 0.8
Incidents · Singapore Strait	1	12.1	1	12	5.0× / 0.2
Cable ops · Mediterranean Sea - Eastern Basin	1	8.5	0	—	0.3× / 3.4
Wrecks · Bay of Biscay	1	8.3	1	8	new / 0
Nav aids · Norwegian Sea	1	8.2	1	8	5.0× / 0.2
Cable ops · Mediterranean Sea - Western Basin	1	7.5	1	7	5.0× / 0.2
Piracy · Caribbean Sea	1	7	0	—	new / 0
Piracy · North Atlantic Ocean	1	7	0	—	new / 0
Exercises · Adriatic Sea	1	6.7	0	—	new / 0
Missiles · Laccadive Sea	1	6.4	0	—	1.0× / 1
Surveys · North Pacific Ocean	1	6.4	0	—	new / 0
Piracy · Indian Ocean	1	6.1	1	6	2.5× / 0.4
Incidents · Makassar Strait	1	6.1	0	—	new / 0
Cable ops · Singapore Strait	1	6.1	0	—	5.0× / 0.2
Cable ops · Celtic Sea	1	6	0	—	1.3× / 0.8
Cable ops · English Channel	1	5.3	0	—	5.0× / 0.2
Quakes · Solomon Sea	1	5.3	1	28	1.3× / 0.8
Missiles · Barentsz Sea	1	5.1	0	—	0.5× / 2
Cable ops · Aegean Sea	1	5	0	—	5.0× / 0.2
Cable ops · Tasman Sea	1	5	0	—	1.7× / 0.6
Incidents · Gulf of Guinea	1	4.4	0	—	5.0× / 0.2
Cable ops · North Sea	1	4.4	0	—	0.8× / 1.2
Surveys · Celtic Sea	1	3.7	0	—	5.0× / 0.2
Derelicts · Arabian Sea	1	3	0	—	1.7× / 0.6
Quakes · Arctic Ocean	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	5.0× / 0.2
Quakes · Bismarck Sea	1	3	0	—	new / 0
Containers · Coral Sea	1	3	0	—	new / 0
Derelicts · Coral Sea	1	3	0	—	2.5× / 0.4
Quakes · Greenland Sea	1	3	0	—	new / 0
Spills · Gulf of Alaska	1	3	1	3	1.3× / 0.8
Containers · Indian Ocean	1	3	0	—	5.0× / 0.2
Derelicts · Indian Ocean	1	3	0	—	0.5× / 2.2
Other · Irish Sea and St. George's Channel	1	3	0	—	new / 0
Debris · Japan Sea	1	3	0	—	new / 0
Derelicts · Laccadive Sea	1	3	0	—	2.5× / 0.4
Quakes · Molukka Sea	1	3	0	—	new / 0
Debris · North Sea	1	3	0	—	1.7× / 0.6
Quakes · South Atlantic Ocean	1	3	0	—	1.3× / 0.8
Restricted · South Atlantic Ocean	1	3	0	—	new / 0
Debris · Tasman Sea	1	3	0	—	2.5× / 0.4
Quakes · Ceram Sea	1	2.4	1	2	5.0× / 0.2
Surveys · North Sea	1	2.2	0	—	0.6× / 1.6
Nav aids · Bass Strait	1	2.1	0	—	0.3× / 3.6
Exercises · Caribbean Sea	1	2.1	0	—	1.7× / 0.6
Restricted · Red Sea	1	2.1	0	—	new / 0
Debris · Bay of Bengal	1	1.7	0	—	5.0× / 0.2
Derelicts · Molukka Sea	1	1.3	1	1	new / 0
Missiles · Arabian Sea	1	0.7	1	34	1.7× / 0.6
Incidents · Gulf of Thailand	1	0.7	1	0	1.7× / 0.6
Missiles · Norwegian Sea	1	0.6	1	0	1.3× / 0.8
Cable ops · Bay of Bengal	1	0.3	1	0	0.6× / 1.8
Debris · Indian Ocean	1	0.3	1	0	2.5× / 0.4
Debris · Celtic Sea	1	0.2	1	0	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	0.1	0	—	1.0× / 1
Incidents · Molukka Sea	1	0	0	—	2.5× / 0.4
Wrecks · South China Sealong running	0	422.6	15	1,388	0.0× / 0.4
Surveys · Arctic Oceanlong running	0	168	6	1,317	— / 0
Surveys · Beaufort Sealong running	0	140	5	1,978	— / 0
Surveys · The Northwestern Passageslong running	0	140	5	2,032	— / 0
Other · Caribbean Sealong running	0	129.5	4	404	0.0× / 1
Other · Coral Sealong running	0	84.6	3	1,050	0.0× / 0.6
Surveys · Bering Sea	0	84	3	232	— / 0
Wrecks · Gulf of Mexico	0	84	3	349	— / 0
Exercises · Ionian Sea	0	84	3	63	0.0× / 0.4
Wrecks · North Atlantic Oceanlong running	0	84	3	394	— / 0
Wrecks · North Pacific Ocean	0	84	3	314	— / 0
Volcanic · Philippine Sealong running	0	84	3	2,131	0.0× / 0.4
Ordnance · Black Sealong running	0	56	2	421	— / 0
Storms · Caribbean Sea	0	56	2	169	— / 0
Nav aids · Gulf of California	0	56	2	123	0.0× / 0.2
Surveys · Hudson Strait	0	56	2	145	— / 0
Wrecks · Laccadive Sea	0	56	2	264	0.0× / 0.2
Nav aids · Malacca Straitlong running	0	56	2	856	— / 0
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	56	2	688	— / 0
Nav aids · Singapore Straitlong running	0	56	2	811	— / 0
Wrecks · The Northwestern Passages	0	56	2	186	— / 0
Surveys · Persian Gulf	0	48.8	1	82	0.0× / 0.2
Incidents · Mediterranean Sea - Western Basin	0	31.5	0	—	0.0× / 0.4
Other · South China Sealong running	0	28.6	1	1,190	0.0× / 0.4
Missiles · Aegean Sea	0	28	1	63	— / 0
Surveys · Andaman or Burma Sea	0	28	1	42	0.0× / 0.2
Wrecks · Andaman or Burma Sealong running	0	28	1	418	— / 0
Quakes · Banda Sea	0	28	1	127	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2018-02, 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.