Sea Ledger, February 2017

2017-02-01 to 2017-02-28 · archive

issued: 620
warning-days in force: 11,146
in force at month end: 411
sea × type cells: 226

baseline: same month, previous 5 years (2016-02, 2015-02, 2014-02, 2013-02, 2012-02)

By type

type	issued	warning-days	in force at end
Incidents	171	1,255.1	52
Exercises	132	1,279.1	49
Nav aids	75	3,175.1	116
Icebergs	59	68.8	3
Surveys	58	1,822.3	67
Derelicts	18	105.7	3
Missiles	18	173.4	7
Spills	17	251	8
Other	16	534.8	18
Cable ops	16	705.8	20
Wrecks	14	1,232.5	48
Quakes	11	32.9	3
Piracy	5	40	0
Debris	4	12	0
Containers	3	9	0
Ordnance	2	112.3	5
Restricted	1	140	5
Volcanic	0	84	3
War risk	0	56	2
Structures	0	28	1
Storms	0	28	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Exercises · North Pacific Oceansurge	36	166.7	7	61	2.2× / 16.2
Incidents · South China Sea	33	230.1	15	45	1.9× / 17.2
Icebergs · Southern Oceansurge	29	30.8	1	28	13× / 2.2
Icebergs · Labrador Sea	28	32	2	29	1.2× / 23.8
Incidents · Mediterranean Sea - Eastern Basinsurge	27	341.7	11	47	4.1× / 6.6
Surveys · South Atlantic Oceansurge	27	254.6	11	265	5.0× / 5.4
Exercises · North Atlantic Oceansurge	23	186.5	6	34	7.7× / 3
Incidents · Philippine Seasurge	18	68.3	5	28	5.3× / 3.4
Incidents · North Pacific Ocean	17	90.7	3	42	0.7× / 24
Exercises · Bay of Bengalsurge	15	49.9	4	32	2.3× / 6.4
Incidents · North Atlantic Ocean	14	158.3	6	41	1.0× / 14
Nav aids · North Sealong running	13	277.3	10	465	0.9× / 15.2
Nav aids · North Atlantic Oceanlong running	8	220.4	10	1,378	1.8× / 4.4
Incidents · Caribbean Seasurge	8	80.1	4	41	2.9× / 2.8
Incidents · Coral Seasurge	8	20.2	0	—	2.4× / 3.4
Incidents · South Pacific Ocean	8	15.8	0	—	1.3× / 6.2
Nav aids · South Atlantic Ocean	7	322.1	10	186	1.3× / 5.4
Spills · Gulf of Mexico	7	100	3	42	1.7× / 4.2
Exercises · South Atlantic Oceansurge	7	34.6	0	—	2.3× / 3
Surveys · North Seasurge	7	31	2	32	35× / 0.2
Nav aids · Gulf of Mexicosurgelong running	6	250.6	8	1,109	4.3× / 1.4
Surveys · Arabian Seasurge	6	111.8	3	49	3.8× / 1.6
Exercises · Black Sea	6	95.7	3	90	0.9× / 7
Exercises · Arabian Sea	6	84.4	4	40	0.9× / 6.4
Exercises · Laccadive Seasurge	6	42.8	1	29	3.8× / 1.6
Exercises · Indian Oceansurge	6	28.2	0	—	30× / 0.2
Quakes · South Pacific Ocean	6	15.6	2	30	0.8× / 7.4
Nav aids · North Pacific Oceansurge	5	324.1	9	290	2.8× / 1.8
Surveys · North Atlantic Oceansurgelong running	5	186	8	1,001	2.8× / 1.8
Surveys · Gulf of Mexicosurge	5	68.4	3	27	25× / 0.2
Nav aids · Inner Seas off the West Coast of Scotland	5	68	3	118	1.7× / 3
Missiles · Black Seasurge	5	66.4	2	33	3.1× / 1.6
Derelicts · North Atlantic Ocean	5	26.1	1	28	1.0× / 4.8
Incidents · South Atlantic Ocean	5	25.4	1	32	0.9× / 5.6
Exercises · Mediterranean Sea - Eastern Basin	5	11.8	0	—	1.1× / 4.6
Missiles · Barentsz Seasurge	5	8.7	2	12	5.0× / 1
Other · Caribbean Seasurge	4	88.3	4	39	20× / 0.2
Incidents · Arabian Sea	4	73	1	46	1.7× / 2.4
Nav aids · Irish Sea and St. George's Channelsurge	4	56.2	3	53	2.2× / 1.8
Nav aids · The Coastal Waters of Southeast Alaska and British Columbiasurge	4	45.9	1	33	10× / 0.4
Wrecks · North Seanew	4	41.5	2	37	new / 0
Piracy · Gulf of Guinea	4	21	0	—	1.8× / 2.2
Exercises · Yellow Sea	4	13.5	3	25	0.4× / 10.2
Derelicts · South Pacific Oceansurge	4	12	0	—	2.9× / 1.4
Nav aids · Celtic Seasurge	4	8.4	1	24	2.2× / 1.8
Nav aids · Caribbean Seasurgelong running	3	601.9	24	1,114	3.8× / 0.8
Exercises · Aegean Sea	3	288.9	11	61	1.1× / 2.6
Wrecks · Caribbean Seanew	3	274	11	227	new / 0
Cable ops · South China Seasurge	3	87.9	3	55	2.1× / 1.4
Exercises · South China Sea	3	60.7	2	32	1.4× / 2.2
Incidents · Laccadive Sea	3	49.5	1	36	1.1× / 2.6
Surveys · Aegean Seasurge	3	42	2	22	7.5× / 0.4
Spills · Bering Seanew	3	42	0	—	new / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbiasurge	3	25	3	13	3.0× / 1
Exercises · Baltic Sea	3	9.2	1	22	1.9× / 1.6
Containers · Mediterranean Sea - Western Basinsurge	3	9	0	—	7.5× / 0.4
Incidents · Davis Straitsurge	3	3.1	0	—	3.8× / 0.8
Wrecks · South China Sealong running	2	216.9	9	1,023	5.0× / 0.4
Nav aids · South Pacific Ocean	2	134.6	5	186	2.0× / 1
Surveys · Bay of Bengal	2	127.1	5	235	3.3× / 0.6
Other · Coral Sealong running	2	87	3	685	10× / 0.2
Wrecks · South Pacific Ocean	2	72.9	4	40	10× / 0.2
Exercises · Philippine Sea	2	55.7	2	32	0.6× / 3.6
Cable ops · North Atlantic Ocean	2	51.1	2	157	1.3× / 1.6
Nav aids · Persian Gulf	2	45.2	3	209	10× / 0.2
Other · Gulf of Mexiconew	2	45	2	84	new / 0
Missiles · North Pacific Ocean	2	41.4	1	56	0.5× / 4.4
Spills · North Atlantic Ocean	2	41	0	—	1.1× / 1.8
Nav aids · Bass Straitlong running	2	30.2	1	668	0.5× / 4.2
Ordnance · North Seanew	2	28.3	2	16	new / 0
Cable ops · Mediterranean Sea - Eastern Basin	2	25.6	0	—	0.6× / 3.2
Exercises · Gulf of Mexico	2	24.1	0	—	0.7× / 2.8
Other · North Pacific Ocean	2	23.4	0	—	5.0× / 0.4
Incidents · Indian Ocean	2	19.9	0	—	0.3× / 6
Nav aids · Mediterranean Sea - Western Basin	2	15.3	2	13	1.7× / 1.2
Spills · Gulf of Alaska	2	15	1	21	5.0× / 0.4
Missiles · Japan Seanew	2	13.9	0	—	new / 0
Cable ops · Celtic Sea	2	11.5	0	—	5.0× / 0.4
Incidents · Gulf of Mexico	2	6.7	1	36	0.7× / 3
Icebergs · Indian Ocean	2	6	0	—	10× / 0.2
Quakes · Philippine Sea	2	6	0	—	0.9× / 2.2
Derelicts · South Atlantic Ocean	2	6	0	—	1.4× / 1.4
Incidents · Bering Seanew	2	4.9	0	—	new / 0
Missiles · Indian Ocean	2	4.7	0	—	5.0× / 0.4
Cable ops · North Sea	2	4.4	0	—	1.3× / 1.6
Incidents · Molukka Seanew	2	3.7	1	3	new / 0
Incidents · Bismarck Sea	2	3.4	0	—	2.0× / 1
Other · North Sea	2	2.3	0	—	1.4× / 1.4
Incidents · Timor Seanew	2	0.4	0	—	new / 0
Incidents · Solomon Sea	2	0.3	0	—	3.3× / 0.6
Incidents · Tasman Sea	2	0.3	0	—	10× / 0.2
Wrecks · Arabian Sealong running	1	148.8	5	1,066	0.6× / 1.6
Nav aids · Coral Sealong running	1	112.1	4	1,047	0.3× / 3.4
Exercises · Ionian Sea	1	86.1	3	58	5.0× / 0.2
Nav aids · Tasman Sea	1	56.8	3	273	0.5× / 2
Other · Sea of Azov	1	56.3	2	214	new / 0
Nav aids · English Channel	1	56.2	2	258	0.4× / 2.8
Cable ops · Caribbean Sea	1	48.1	1	74	1.3× / 0.8
Surveys · Mediterranean Sea - Eastern Basin	1	46.4	1	89	1.3× / 0.8
Cable ops · Arabian Sea	1	37.7	1	103	0.6× / 1.8
Other · Arabian Sea	1	30.5	1	57	2.5× / 0.4
Nav aids · Indian Oceanlong running	1	29.9	1	597	0.5× / 2
Surveys · Black Sea	1	29.5	1	62	5.0× / 0.2
Cable ops · Tasman Sea	1	28.6	0	—	2.5× / 0.4
Restricted · Persian Gulf	1	28	1	314	new / 0
Incidents · Gulf of Guinea	1	20.9	1	20	new / 0
Wrecks · South Atlantic Ocean	1	18.2	1	18	2.5× / 0.4
Incidents · Eastern China Sea	1	17.7	1	17	5.0× / 0.2
Other · Davis Strait	1	16.4	0	—	5.0× / 0.2
Derelicts · Caribbean Sea	1	14.1	0	—	0.8× / 1.2
Cable ops · Singapore Strait	1	12.5	1	12	new / 0
Nav aids · Andaman or Burma Sea	1	12	0	—	2.5× / 0.4
Derelicts · Indian Ocean	1	8.6	0	—	0.3× / 3.2
Nav aids · Japan Sea	1	8.5	0	—	new / 0
Cable ops · Gulf of Suez	1	8	0	—	new / 0
Incidents · Japan Sea	1	7.5	1	7	1.7× / 0.6
Piracy · Sulu Sea	1	7	0	—	new / 0
Missiles · South Pacific Ocean	1	5.4	1	29	0.8× / 1.2
Incidents · Java Sea	1	5.1	0	—	new / 0
Exercises · Japan Sea	1	5	0	—	new / 0
Incidents · Gulf of Thailand	1	4.9	0	—	1.7× / 0.6
Missiles · Laccadive Sea	1	4.9	0	—	1.0× / 1
Quakes · North Pacific Ocean	1	3.3	1	28	0.2× / 5.2
Incidents · Banda Sea	1	3.1	0	—	new / 0
Quakes · Arabian Sea	1	3	0	—	5.0× / 0.2
Quakes · Caribbean Sea	1	3	0	—	new / 0
Debris · Coral Sea	1	3	0	—	new / 0
Debris · English Channel	1	3	0	—	2.5× / 0.4
Derelicts · English Channel	1	3	0	—	new / 0
Debris · Indian Ocean	1	3	0	—	5.0× / 0.2
Nav aids · Laccadive Sea	1	3	0	—	2.5× / 0.4
Debris · North Atlantic Ocean	1	3	0	—	1.7× / 0.6
Derelicts · Philippine Sea	1	3	0	—	0.8× / 1.2
Derelicts · Red Sea	1	3	0	—	new / 0
Surveys · Great Australian Bight	1	1.4	0	—	new / 0
Exercises · Bering Sea	1	1.2	0	—	1.7× / 0.6
Exercises · South Pacific Ocean	1	1.2	1	1	0.2× / 4.2
Derelicts · North Pacific Ocean	1	1.1	0	—	1.0× / 1
Other · South Atlantic Ocean	1	1.1	0	—	1.7× / 0.6
Wrecks · Indian Ocean	1	1	0	—	new / 0
Exercises · Coral Sea	1	0.3	0	—	0.7× / 1.4
Derelicts · North Sea	1	0.2	1	0	new / 0
Incidents · Great Australian Bight	1	0.1	0	—	2.5× / 0.4
Nav aids · Timor Sea	1	0.1	0	—	5.0× / 0.2
Surveys · Arctic Oceanlong running	0	224	8	2,318	0.0× / 0.2
Surveys · Beaufort Sealong running	0	196	7	2,393	— / 0
Surveys · Bering Sea	0	84	3	233	— / 0
Cable ops · Persian Gulf	0	84	3	90	0.0× / 0.4
Other · South China Sealong running	0	84	3	825	0.0× / 0.4
Cable ops · Gulf of Mexico	0	64.9	2	120	0.0× / 1
Surveys · Caribbean Sealong running	0	61.4	1	487	0.0× / 0.2
Ordnance · Black Sea	0	56	2	258	— / 0
Restricted · Black Sealong running	0	56	2	1,364	— / 0
Surveys · Davis Straitlong running	0	56	2	520	— / 0
Nav aids · Gulf of California	0	56	2	251	0.0× / 0.2
Wrecks · Hudson Bay	0	56	2	70	— / 0
Nav aids · Kara Sealong running	0	56	2	404	— / 0
Nav aids · Malacca Straitlong running	0	56	2	491	— / 0
War risk · Mediterranean Sea - Eastern Basinlong running	0	56	2	2,106	— / 0
Surveys · Persian Gulf	0	56	2	351	0.0× / 0.2
Nav aids · Sea of Okhotsklong running	0	56	2	1,897	— / 0
Surveys · The Northwestern Passageslong running	0	56	2	1,667	— / 0
Wrecks · The Northwestern Passages	0	56	2	170	— / 0
Cable ops · Bay of Bengal	0	51	1	43	0.0× / 1.8
Nav aids · Bay of Bengal	0	48.8	1	70	0.0× / 1
Cable ops · Eastern China Sea	0	29.5	1	96	0.0× / 0.6
Missiles · Aegean Sea	0	28	1	58	— / 0
Exercises · Alboran Sea	0	28	1	29	0.0× / 0.2
Surveys · Andaman or Burma Sea	0	28	1	70	0.0× / 0.2
Wrecks · Andaman or Burma Sea	0	28	1	53	— / 0
Nav aids · Arabian Sea	0	28	1	53	— / 0
Nav aids · Arafura Sea	0	28	1	250	0.0× / 0.4
Wrecks · Arctic Ocean	0	28	1	48	— / 0
Surveys · Balearic (Iberian Sea)	0	28	1	37	— / 0
Restricted · Baltic Sea	0	28	1	166	— / 0
Other · Beaufort Sea	0	28	1	147	— / 0
Cable ops · Black Sea	0	28	1	189	— / 0
Wrecks · Black Sea	0	28	1	138	— / 0
Spills · Caribbean Sealong running	0	28	1	382	0.0× / 0.4
Storms · Caribbean Sea	0	28	1	134	— / 0
Volcanic · Caribbean Sealong running	0	28	1	586	— / 0
Cable ops · Chukchi Sea	0	28	1	205	— / 0
Other · Chukchi Sealong running	0	28	1	503	— / 0
Surveys · Chukchi Sea	0	28	1	173	— / 0
Nav aids · Great Australian Bightlong running	0	28	1	454	0.0× / 2
Wrecks · Gulf of Californialong running	0	28	1	489	— / 0
Cable ops · Gulf of Guinea	0	28	1	54	0.0× / 1.2
Wrecks · Gulf of Guinealong running	0	28	1	649	— / 0
Wrecks · Gulf of Thailand	0	28	1	87	— / 0
Surveys · Indian Ocean	0	28	1	96	0.0× / 0.4
Wrecks · Irish Sea and St. George's Channel	0	28	1	50	0.0× / 0.2
Other · Japan Sea	0	28	1	180	— / 0
Surveys · Japan Sea	0	28	1	109	— / 0
Wrecks · Kara Sea	0	28	1	330	— / 0
Wrecks · Malacca Straitlong running	0	28	1	691	— / 0
Nav aids · Mediterranean Sea - Eastern Basin	0	28	1	323	— / 0
Wrecks · North Atlantic Ocean	0	28	1	29	— / 0
Wrecks · North Pacific Ocean	0	28	1	118	— / 0
Structures · Persian Gulf	0	28	1	177	0.0× / 0.2
Wrecks · Persian Gulf	0	28	1	36	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2017-02, 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.