Sea Ledger, May 2018

2018-05-01 to 2018-05-31 · archive

issued: 653
warning-days in force: 14,078
in force at month end: 477
sea × type cells: 244

baseline: same month, previous 5 years (2017-05, 2016-05, 2015-05, 2014-05, 2013-05)

By type

type	issued	warning-days	in force at end
Incidents	143	1,662.6	66
Exercises	117	1,289.2	46
Icebergs	107	110.7	3
Nav aids	72	3,981.2	132
Missiles	43	230.5	4
Cable ops	38	362.2	15
Surveys	36	2,212.1	70
Quakes	31	97.7	0
Derelicts	20	137.6	7
Other	11	500.9	17
Spills	8	133	5
Debris	7	17.5	3
Piracy	6	35.5	1
Wrecks	4	2,591.6	83
Ordnance	4	190.3	7
Containers	3	8.4	1
Restricted	1	159.2	5
Structures	1	59.7	2
Storms	1	111.6	4
Volcanic	0	186	6

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Southern Oceansurge	42	42.6	0	—	21× / 2
Icebergs · South Atlantic Oceansurge	33	32.1	1	31	6.3× / 5.2
Icebergs · North Atlantic Ocean	29	31.5	2	29	1.5× / 19.2
Incidents · South China Sea	25	266.3	5	47	1.4× / 17.2
Incidents · Mediterranean Sea - Eastern Basin	24	373.6	16	44	1.3× / 18.8
Incidents · North Pacific Ocean	23	253.8	9	279	0.8× / 29.4
Exercises · North Pacific Ocean	21	208.1	9	64	1.1× / 20
Incidents · North Atlantic Ocean	18	243.2	13	47	0.8× / 21.6
Quakes · South Pacific Ocean	15	47.8	0	—	1.7× / 8.6
Missiles · North Atlantic Ocean	14	25	1	31	1.6× / 8.8
Cable ops · North Atlantic Oceansurge	13	51.3	2	31	3.0× / 4.4
Nav aids · North Atlantic Oceansurgelong running	11	331	15	461	2.2× / 5
Exercises · Black Sea	11	158.7	7	93	1.2× / 9.4
Exercises · Bay of Bengalsurge	11	53.6	1	35	2.0× / 5.4
Exercises · South Pacific Oceansurge	11	40.6	2	28	2.4× / 4.6
Missiles · Barentsz Seasurge	10	32.8	0	—	4.5× / 2.2
Nav aids · South Atlantic Ocean	9	649.9	22	198	1.3× / 7
Exercises · South Atlantic Ocean	9	42	0	—	1.5× / 6
Incidents · Indian Ocean	8	52.2	3	23	0.8× / 9.4
Nav aids · Coral Sealong running	7	205.1	6	782	1.1× / 6.2
Surveys · Arabian Seasurge	7	174.1	5	53	3.2× / 2.2
Missiles · North Pacific Ocean	7	65.7	1	76	0.8× / 8.2
Exercises · Arabian Sea	7	65.2	2	35	1.0× / 6.8
Incidents · Caribbean Sea	7	60.5	5	23	1.5× / 4.8
Exercises · Mediterranean Sea - Eastern Basin	7	51.3	1	93	1.3× / 5.6
Quakes · North Pacific Ocean	7	21	0	—	0.8× / 8.4
Surveys · South Atlantic Ocean	6	224.3	8	86	0.8× / 7.4
Nav aids · North Sea	6	152.1	6	330	0.7× / 9.2
Incidents · South Pacific Ocean	6	39.8	0	—	0.7× / 8.4
Exercises · Yellow Sea	6	29.8	0	—	0.5× / 12.2
Incidents · South Atlantic Ocean	5	53.7	3	32	0.9× / 5.4
Missiles · Japan Seasurge	5	47.3	1	34	13× / 0.4
Nav aids · English Channel	5	37.1	1	51	1.9× / 2.6
Exercises · South China Seasurge	5	23.2	3	16	2.3× / 2.2
Exercises · North Atlantic Ocean	5	18.1	0	—	1.8× / 2.8
Nav aids · South Pacific Oceansurge	4	202.6	5	350	2.9× / 1.4
Ordnance · North Sea	4	128.3	5	65	1.8× / 2.2
Nav aids · Tasman Seasurgelong running	4	79.6	2	457	6.7× / 0.6
Surveys · Mediterranean Sea - Eastern Basin	4	76.2	2	51	1.2× / 3.4
Incidents · Gulf of Mexico	4	68.9	3	37	0.9× / 4.6
Nav aids · Davis Straitnew	4	30.6	2	15	new / 0
Missiles · Indian Oceansurge	4	18.9	0	—	3.3× / 1.2
Derelicts · North Atlantic Ocean	4	13.5	1	33	1.1× / 3.8
Incidents · Banda Seasurge	4	10.7	0	—	10× / 0.4
Surveys · North Atlantic Oceanlong running	3	339.1	11	833	0.7× / 4.2
Incidents · Philippine Sea	3	64.2	1	38	0.7× / 4.6
Exercises · Gulf of Mexico	3	57.9	3	19	1.5× / 2
Spills · Gulf of Mexico	3	54	1	44	0.6× / 5
Incidents · Eastern China Seasurge	3	41.1	2	32	2.1× / 1.4
Other · North Pacific Oceansurge	3	28.7	2	21	5.0× / 0.6
Exercises · Norwegian Seasurge	3	23.4	1	10	2.5× / 1.2
Piracy · Gulf of Guinea	3	19.9	1	23	1.9× / 1.6
Exercises · Indian Oceannew	3	18.9	0	—	new / 0
Exercises · Barentsz Seasurge	3	13.4	0	—	2.5× / 1.2
Cable ops · Ionian Seanew	3	7.3	0	—	new / 0
Derelicts · North Pacific Ocean	3	6.4	1	5	1.9× / 1.6
Icebergs · Labrador Sea	3	4.5	0	—	0.2× / 13
Exercises · Aegean Sea	2	311.5	10	155	0.8× / 2.4
Nav aids · Gulf of Mexicolong running	2	217.6	7	482	0.4× / 4.6
Surveys · North Sea	2	72.8	3	36	1.1× / 1.8
Spills · North Atlantic Ocean	2	53	1	37	0.8× / 2.4
Surveys · Norwegian Sea	2	47.5	3	35	1.7× / 1.2
Surveys · Mediterranean Sea - Western Basin	2	45	2	37	5.0× / 0.4
Derelicts · South China Sealong running	2	34.3	1	496	5.0× / 0.4
Other · English Channel	2	34	1	68	5.0× / 0.4
Cable ops · Indian Oceannew	2	32.9	1	51	new / 0
Exercises · Laccadive Sea	2	32.7	1	34	1.1× / 1.8
Nav aids · Laccadive Sea	2	29.3	0	—	3.3× / 0.6
Cable ops · South Atlantic Ocean	2	29.1	1	21	0.2× / 10.4
Cable ops · Mediterranean Sea - Western Basinnew	2	26.8	1	34	new / 0
Incidents · Arafura Seanew	2	24	1	28	new / 0
Derelicts · Gulf of Mexico	2	20.1	2	19	2.0× / 1
Cable ops · Gulf of Mexico	2	18.2	1	18	0.9× / 2.2
Incidents · Singapore Straitnew	2	18.2	1	18	new / 0
Spills · North Pacific Ocean	2	16	2	13	0.5× / 4
Derelicts · Indian Ocean	2	13.8	0	—	0.4× / 5.2
Cable ops · Persian Gulf	2	10.7	0	—	3.3× / 0.6
Piracy · Caribbean Seanew	2	8.6	0	—	new / 0
Derelicts · Caribbean Sea	2	6	0	—	3.3× / 0.6
Cable ops · Eastern China Sea	2	6	1	5	2.0× / 1
Quakes · Mozambique Channelnew	2	6	0	—	new / 0
Debris · North Atlantic Oceannew	2	6	0	—	new / 0
Quakes · North Atlantic Ocean	2	6	0	—	3.3× / 0.6
Quakes · Philippine Sea	2	6	0	—	0.8× / 2.6
Containers · South Atlantic Ocean	2	6	0	—	10× / 0.2
Exercises · Philippine Sea	2	5.7	1	25	0.7× / 2.8
Cable ops · Mediterranean Sea - Eastern Basin	2	4.8	0	—	1.3× / 1.6
Nav aids · Bass Strait	2	4.3	0	—	2.0× / 1
Incidents · Tasman Sea	2	3.7	0	—	1.7× / 1.2
Wrecks · Caribbean Sealong running	1	649.1	21	500	new / 0
Wrecks · North Sealong running	1	179.2	6	428	1.3× / 0.8
Nav aids · Inner Seas off the West Coast of Scotland	1	96.6	3	255	0.3× / 3
Nav aids · Bay of Bengallong running	1	95.2	3	412	2.5× / 0.4
Other · Coral Sealong running	1	93	3	541	2.5× / 0.4
Nav aids · Singapore Straitlong running	1	73.8	3	903	5.0× / 0.2
Nav aids · Arabian Sealong running	1	65	2	399	0.4× / 2.6
Nav aids · Indian Ocean	1	62.1	2	285	0.4× / 2.4
Surveys · Indian Ocean	1	61.4	0	—	0.7× / 1.4
Surveys · Barentsz Sea	1	52	2	65	new / 0
Wrecks · Gulf of Guinea	1	50.9	1	274	1.3× / 0.8
Storms · South Pacific Ocean	1	49.6	2	48	new / 0
Surveys · South China Sea	1	47.5	2	157	1.0× / 1
Nav aids · Gulf of Thailand	1	44.5	2	127	new / 0
Surveys · Gulf of Guinea	1	44.3	2	104	1.7× / 0.6
Wrecks · Bristol Channel	1	38.5	2	265	new / 0
Surveys · Andaman or Burma Sea	1	35.7	1	134	1.3× / 0.8
Missiles · Aegean Sea	1	34.2	1	155	1.7× / 0.6
Derelicts · South Pacific Ocean	1	34	1	61	0.6× / 1.8
Nav aids · Alboran Sea	1	33.7	1	91	new / 0
Nav aids · Great Australian Bight	1	32.7	2	112	2.5× / 0.4
Cable ops · Black Sea	1	31	1	140	5.0× / 0.2
Cable ops · North Sea	1	31	1	48	0.3× / 3.4
Surveys · Black Sea	1	27.9	0	—	0.6× / 1.6
Incidents · Gulf of Thailand	1	22.7	1	41	1.7× / 0.6
Other · Mediterranean Sea - Eastern Basin	1	19.5	1	19	2.5× / 0.4
Exercises · Caribbean Sea	1	19.3	1	19	0.5× / 2
Incidents · Savu Sea	1	18.7	1	18	new / 0
Surveys · Tasman Sea	1	18.2	1	18	5.0× / 0.2
Cable ops · South China Sea	1	17.8	1	33	0.5× / 2
Structures · South China Sea	1	17.8	1	17	new / 0
Nav aids · Strait of Gibraltar	1	14.5	1	14	new / 0
Surveys · Strait of Gibraltar	1	13.6	0	—	new / 0
Surveys · Banda Sea	1	13.5	0	—	5.0× / 0.2
Cable ops · Arabian Sea	1	11.1	0	—	0.6× / 1.8
Exercises · Baltic Sea	1	8.6	0	—	0.4× / 2.4
Incidents · Mediterranean Sea - Western Basin	1	8.5	1	8	1.0× / 1
Other · Adriatic Sea	1	7.5	0	—	5.0× / 0.2
Cable ops · Gulf of Thailand	1	7.4	1	7	5.0× / 0.2
Incidents · Aegean Sea	1	7.3	0	—	5.0× / 0.2
Piracy · Red Sea	1	7	0	—	5.0× / 0.2
Exercises · Gulf of Guinea	1	5.4	1	5	new / 0
Surveys · Laccadive Sea	1	5.2	0	—	5.0× / 0.2
Nav aids · Arafura Sea	1	5	0	—	1.7× / 0.6
Missiles · Laccadive Sea	1	4.5	0	—	1.0× / 1
Restricted · Barentsz Sea	1	4.2	0	—	1.7× / 0.6
Exercises · Sulu Sea	1	4	0	—	5.0× / 0.2
Nav aids · Bristol Channel	1	3.7	0	—	1.3× / 0.8
Cable ops · Bristol Channel	1	3.6	0	—	new / 0
Cable ops · Japan Sea	1	3.6	1	3	2.5× / 0.4
Exercises · Celebes Sea	1	3.5	0	—	new / 0
Nav aids · Celtic Sea	1	3.3	0	—	2.5× / 0.4
Quakes · Celebes Sea	1	3	0	—	new / 0
Spills · Gulf of St. Lawrence	1	3	1	3	5.0× / 0.2
Debris · Indian Ocean	1	3	0	—	2.5× / 0.4
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	2.5× / 0.4
Derelicts · Solomon Sea	1	3	0	—	new / 0
Quakes · Solomon Sea	1	3	0	—	0.4× / 2.8
Quakes · South Atlantic Ocean	1	3	0	—	0.4× / 2.8
Debris · South Pacific Ocean	1	3	0	—	5.0× / 0.2
Nav aids · Irish Sea and St. George's Channel	1	2.9	0	—	0.4× / 2.8
Nav aids · Balearic (Iberian Sea)	1	2.8	0	—	new / 0
Cable ops · South Pacific Ocean	1	2.7	1	36	2.5× / 0.4
Nav aids · Tyrrhenian Sea	1	2.6	0	—	new / 0
Containers · Arabian Sea	1	2.4	1	2	new / 0
Debris · Kara Sea	1	2.3	1	2	new / 0
Derelicts · Bay of Bengal	1	2.2	1	2	5.0× / 0.2
Other · North Atlantic Ocean	1	2.2	1	2	0.3× / 3.2
Other · Tasman Sea	1	2.2	0	—	1.0× / 1
Missiles · South China Sea	1	2.1	0	—	new / 0
Incidents · Laccadive Sea	1	2	1	2	0.8× / 1.2
Debris · North Sea	1	1.4	1	1	5.0× / 0.2
Debris · Arabian Sea	1	1.3	1	1	new / 0
Derelicts · Arabian Sea	1	1.3	0	—	new / 0
Exercises · Bay of Biscay	1	1.3	0	—	new / 0
Other · North Sea	1	1.3	0	—	0.4× / 2.4
Nav aids · Andaman or Burma Sea	1	0.7	0	—	2.5× / 0.4
Incidents · Coral Sea	1	0.5	0	—	0.3× / 3.6
Incidents · Timor Sea	1	0.1	0	—	0.6× / 1.6
Nav aids · Caribbean Sealong running	0	559	17	373	0.0× / 1.2
Wrecks · South China Sealong running	0	479.6	15	1,480	0.0× / 1.2
Nav aids · North Pacific Ocean	0	372	12	215	0.0× / 4.6
Surveys · Arctic Oceanlong running	0	186	6	1,409	— / 0
Surveys · Beaufort Sealong running	0	155	5	2,070	— / 0
Wrecks · South Pacific Ocean	0	155	5	248	0.0× / 0.4
Surveys · The Northwestern Passageslong running	0	155	5	2,124	— / 0
Other · Caribbean Sealong running	0	124	4	496	— / 0
Wrecks · North Atlantic Oceanlong running	0	124	4	486	0.0× / 0.2
Wrecks · North Pacific Oceanlong running	0	124	4	406	— / 0
Wrecks · Arabian Sealong running	0	93	3	588	0.0× / 0.2
Surveys · Bering Sea	0	93	3	324	— / 0
Wrecks · English Channel	0	93	3	91	0.0× / 0.2
Nav aids · Gulf of California	0	93	3	215	0.0× / 0.2
Wrecks · Gulf of Mexicolong running	0	93	3	441	0.0× / 0.2
Exercises · Ionian Sea	0	93	3	155	— / 0
Wrecks · Laccadive Sea	0	93	3	356	0.0× / 0.4
Surveys · Persian Gulf	0	93	3	161	0.0× / 0.4
Volcanic · Philippine Sealong running	0	93	3	2,223	0.0× / 0.4
Nav aids · South China Sea	0	93	3	197	0.0× / 0.2
Nav aids · Mediterranean Sea - Western Basin	0	75.9	2	106	0.0× / 1
Restricted · Black Sealong running	0	62	2	1,821	— / 0
Storms · Caribbean Sea	0	62	2	261	— / 0
Volcanic · Caribbean Sea	0	62	2	79	— / 0
Wrecks · Indian Ocean	0	62	2	329	— / 0
Nav aids · Malacca Straitlong running	0	62	2	948	0.0× / 0.2
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	62	2	780	0.0× / 0.4
Other · South China Sealong running	0	62	2	1,282	0.0× / 0.6
Wrecks · The Northwestern Passages	0	62	2	278	— / 0
Wrecks · South Atlantic Ocean	0	47.3	1	70	0.0× / 0.4
Surveys · Caribbean Sealong running	0	44	1	504	— / 0
Wrecks · Andaman or Burma Sealong running	0	31	1	510	— / 0

Cite: seahazards.com Sea Ledger, 2018-05, 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.