Sea Ledger, January 2017

2017-01-01 to 2017-01-31 · archive

issued: 634
warning-days in force: 13,474
in force at month end: 377
sea × type cells: 241

baseline: same month, previous 5 years (2016-01, 2015-01, 2014-01, 2013-01, 2012-01)

By type

type	issued	warning-days	in force at end
Incidents	145	1,496.7	38
Exercises	117	1,124	43
Nav aids	68	3,906.6	106
Icebergs	65	73.9	3
Cable ops	42	1,046.3	32
Surveys	38	1,889.6	61
Quakes	35	94.8	3
Derelicts	32	255.3	4
Missiles	23	203.1	6
Wrecks	20	1,467.9	42
Other	17	757.4	18
Spills	12	173	4
Debris	7	23.8	0
Piracy	4	49.3	2
Containers	3	9	0
Ordnance	3	130.6	3
Restricted	2	504.3	5
Volcanic	1	62.1	3
War risk	0	62	2
Structures	0	113.3	1
Storms	0	31	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · South China Seasurge	34	385	7	40	2.2× / 15.6
Icebergs · Labrador Sea	31	35.9	2	32	1.9× / 16
Icebergs · South Atlantic Oceansurge	24	26.6	0	—	5.5× / 4.4
Incidents · Mediterranean Sea - Eastern Basin	18	337	9	46	1.8× / 10.2
Incidents · North Atlantic Ocean	18	182.2	8	45	0.8× / 21.2
Exercises · North Pacific Ocean	18	127	6	64	1.1× / 15.6
Nav aids · North Sealong running	16	356.6	11	437	0.8× / 20
Surveys · South Atlantic Oceansurge	16	245.2	9	237	3.0× / 5.4
Incidents · Philippine Seasurge	16	57.8	1	39	3.1× / 5.2
Incidents · North Pacific Ocean	15	92.7	4	46	0.5× / 27.8
Quakes · South Pacific Oceansurge	15	38.5	1	29	2.0× / 7.4
Exercises · North Atlantic Oceansurge	14	71.1	4	46	7.8× / 1.8
Exercises · South Atlantic Ocean	13	67.2	1	26	1.5× / 8.8
Exercises · Black Seasurge	11	114.5	4	62	2.3× / 4.8
Cable ops · South Atlantic Ocean	11	97.6	1	40	0.4× / 28.2
Exercises · Aegean Sealong running	10	313.3	10	396	1.6× / 6.2
Nav aids · South Atlantic Ocean	9	374.6	13	195	1.3× / 6.8
Exercises · Arabian Sea	9	68.4	4	29	1.6× / 5.8
Exercises · Bay of Bengal	9	65.7	1	34	1.3× / 7.2
Icebergs · Southern Oceansurge	9	8.4	1	8	11× / 0.8
Cable ops · South China Seasurge	8	121	4	133	8.0× / 1
Incidents · South Atlantic Ocean	8	59.1	1	35	1.0× / 7.8
Nav aids · North Pacific Oceansurge	6	256.1	9	262	4.3× / 1.4
Wrecks · Caribbean Seasurge	6	138.7	8	199	15× / 0.4
Spills · Gulf of Mexicosurge	6	71	2	29	2.0× / 3
Missiles · North Pacific Ocean	6	58.6	2	53	1.3× / 4.6
Derelicts · North Pacific Oceansurge	6	52.9	0	—	4.3× / 1.4
Exercises · South Pacific Oceansurge	6	23.9	0	—	2.3× / 2.6
Nav aids · The Coastal Waters of Southeast Alaska and British Columbiasurge	6	12.4	1	18	15× / 0.4
Nav aids · North Atlantic Oceanlong running	5	274.6	7	1,350	1.1× / 4.6
Surveys · Arabian Seasurge	5	119.7	3	34	3.6× / 1.4
Missiles · Black Seasurge	5	63.6	2	26	3.1× / 1.6
Exercises · Mediterranean Sea - Eastern Basin	5	34	1	35	1.2× / 4.2
Wrecks · North Seanew	5	17.9	1	17	new / 0
Surveys · North Seanew	5	17	1	14	new / 0
Quakes · Solomon Seasurge	5	15	0	—	8.3× / 0.6
Derelicts · Tasman Seanew	5	5.7	0	—	new / 0
Exercises · Ionian Seasurgelong running	4	105.3	3	395	2.5× / 1.6
Incidents · Gulf of Mexico	4	65.6	2	45	1.3× / 3
Derelicts · Bay of Bengalsurge	4	40.9	1	21	2.9× / 1.4
Cable ops · Bay of Bengal	4	35.3	2	185	1.5× / 2.6
Derelicts · North Atlantic Ocean	4	28	1	46	0.9× / 4.4
Derelicts · South Atlantic Oceansurge	4	27.3	0	—	2.2× / 1.8
Derelicts · South China Seasurge	4	27.3	1	38	4.0× / 1
Missiles · North Atlantic Ocean	4	20.1	0	—	1.3× / 3.2
Incidents · South Pacific Ocean	4	16.6	0	—	0.7× / 5.8
Exercises · Indian Oceansurge	4	14	1	11	10× / 0.4
Quakes · Coral Seasurge	4	10	1	27	2.0× / 2
Nav aids · Mediterranean Sea - Western Basinsurge	4	5.2	0	—	4.0× / 1
Nav aids · Coral Sealong running	3	181.4	4	1,019	0.9× / 3.2
Surveys · Bay of Bengalsurge	3	144.7	5	207	5.0× / 0.6
Cable ops · Eastern China Seasurge	3	80.2	3	68	3.0× / 1
Incidents · Caribbean Sea	3	70.6	1	118	0.7× / 4.4
Cable ops · Arabian Seasurge	3	70.2	2	243	3.0× / 1
Exercises · South China Sea	3	55	2	33	1.3× / 2.4
Incidents · Arabian Sea	3	50.2	2	25	1.7× / 1.8
Wrecks · South Pacific Oceansurge	3	35.5	3	12	5.0× / 0.6
Incidents · Indian Ocean	3	18.6	1	43	0.5× / 5.6
Cable ops · Strait of Gibraltarsurge	3	12	0	—	7.5× / 0.4
Derelicts · Gulf of Mexicosurge	3	9.6	0	—	2.1× / 1.4
Debris · North Pacific Oceansurge	3	9	0	—	15× / 0.2
Exercises · Baltic Seasurge	3	8.7	0	—	3.8× / 0.8
Incidents · Coral Sea	3	1.4	0	—	0.9× / 3.4
Nav aids · Gulf of Mexicolong running	2	249.4	7	1,081	0.9× / 2.2
Cable ops · North Atlantic Ocean	2	119.4	4	129	0.6× / 3.2
Nav aids · Indian Oceanlong running	2	119.2	1	1,077	0.6× / 3.4
Nav aids · Inner Seas off the West Coast of Scotland	2	70.3	3	90	0.5× / 4.2
Ordnance · North Sea	2	37.6	0	—	5.0× / 0.4
Nav aids · English Channel	2	32.4	2	230	0.6× / 3.4
Nav aids · Irish Sea and St. George's Channel	2	32	1	67	1.0× / 2
Spills · North Pacific Ocean	2	28	0	—	1.4× / 1.4
Piracy · Red Sea	2	16.6	1	21	10× / 0.2
Spills · North Atlantic Ocean	2	15	1	20	1.4× / 1.4
Derelicts · Indian Ocean	2	14.5	1	24	0.5× / 3.8
Wrecks · Persian Gulf	2	12.4	1	8	10× / 0.2
Cable ops · Yellow Sea	2	12.1	0	—	2.0× / 1
Incidents · Bay of Bengal	2	9.6	0	—	1.1× / 1.8
Missiles · Arabian Sea	2	8.5	0	—	5.0× / 0.4
Exercises · Philippine Sea	2	8.4	2	4	2.0× / 1
Surveys · Laccadive Sea	2	8	1	12	3.3× / 0.6
Incidents · Bismarck Sea	2	6.7	0	—	0.6× / 3.4
Incidents · Tasman Sea	2	6.2	0	—	1.4× / 1.4
Quakes · Indian Ocean	2	6	0	—	1.1× / 1.8
Quakes · Molukka Sea	2	6	0	—	3.3× / 0.6
Other · Norwegian Seanew	2	6	0	—	new / 0
Containers · South China Seanew	2	6	0	—	new / 0
Surveys · Celtic Sea	2	5.3	0	—	10× / 0.2
Exercises · Caribbean Sea	2	4.8	2	4	1.1× / 1.8
Other · Indian Oceannew	2	4.1	1	21	new / 0
Other · Tasman Sea	2	3.5	0	—	10× / 0.2
Quakes · North Pacific Ocean	2	3.4	1	7	0.5× / 4
Missiles · South Pacific Ocean	2	2.1	1	2	2.5× / 0.8
Nav aids · Caribbean Sealong running	1	624.5	21	1,086	5.0× / 0.2
Nav aids · Bay of Bengallong running	1	156.6	2	476	1.3× / 0.8
Surveys · North Atlantic Oceanlong running	1	129	5	973	0.7× / 1.4
Nav aids · Arabian Sealong running	1	108.6	1	645	5.0× / 0.2
Cable ops · Persian Gulf	1	98.7	3	62	0.4× / 2.4
Cable ops · Tasman Sea	1	93.4	3	104	0.6× / 1.8
Other · Arabian Sea	1	85	1	165	5.0× / 0.2
Wrecks · Irish Sea and St. George's Channellong running	1	84.6	1	592	5.0× / 0.2
Surveys · Caribbean Sealong running	1	81.3	3	459	2.5× / 0.4
Other · Coral Sealong running	1	77.7	3	657	5.0× / 0.2
Other · South Atlantic Ocean	1	73.6	0	—	1.7× / 0.6
Nav aids · Tasman Sea	1	64.6	2	245	5.0× / 0.2
Ordnance · Black Sea	1	62	2	230	new / 0
Wrecks · Andaman or Burma Sealong running	1	59.1	1	488	2.5× / 0.4
Cable ops · Gulf of Guinea	1	49	1	50	1.7× / 0.6
Other · North Atlantic Oceanlong running	1	42.1	1	1,177	0.7× / 1.4
Surveys · Mediterranean Sea - Eastern Basin	1	38.5	2	61	1.3× / 0.8
Incidents · Laccadive Sea	1	33.2	1	33	0.6× / 1.8
Cable ops · Mediterranean Sea - Eastern Basin	1	32.4	1	73	0.6× / 1.6
Exercises · Laccadive Sea	1	32.1	1	32	0.5× / 2
Other · Gulf of Mexico	1	31.9	1	56	new / 0
Nav aids · Arafura Sea	1	31.1	1	222	5.0× / 0.2
Other · English Channel	1	31	1	55	1.0× / 1
Nav aids · Norwegian Sea	1	31	1	51	new / 0
Restricted · Sea of Okhotsk	1	31	1	224	new / 0
Missiles · Aegean Sealong running	1	30.5	1	396	1.3× / 0.8
Nav aids · Eastern China Sea	1	28.8	0	—	new / 0
Surveys · Inner Seas off the West Coast of Scotland	1	25.6	1	25	5.0× / 0.2
Incidents · Gulf of Alaska	1	20.5	0	—	new / 0
Wrecks · Arctic Ocean	1	20.4	1	20	new / 0
Other · North Sea	1	19.3	0	—	0.4× / 2.4
Incidents · Bay of Biscay	1	18.1	0	—	new / 0
Spills · Bay of Fundy	1	14	0	—	new / 0
Spills · Beaufort Sea	1	14	0	—	new / 0
Other · Caribbean Sea	1	11.5	1	11	1.3× / 0.8
Piracy · Celebes Sea	1	10.4	0	—	new / 0
Nav aids · Philippine Sea	1	10	1	10	new / 0
Surveys · Balearic (Iberian Sea)	1	9.1	1	9	5.0× / 0.2
Missiles · Philippine Sea	1	9	0	—	1.0× / 1
Exercises · Barentsz Sea	1	8.2	0	—	new / 0
Other · North Pacific Ocean	1	7.5	0	—	2.5× / 0.4
Missiles · Laccadive Sea	1	5.9	0	—	0.8× / 1.2
Debris · North Atlantic Ocean	1	5.8	0	—	1.0× / 1
Incidents · Davis Strait	1	5.1	0	—	new / 0
Missiles · Barentsz Sea	1	4.8	0	—	2.5× / 0.4
Cable ops · Andaman or Burma Sea	1	4.4	1	4	1.3× / 0.8
Cable ops · Tyrrhenian Sea	1	3.6	0	—	new / 0
Debris · Caribbean Sea	1	3	0	—	new / 0
Quakes · Caribbean Sea	1	3	0	—	5.0× / 0.2
Quakes · Celebes Sea	1	3	0	—	5.0× / 0.2
Debris · Gulf of Mexico	1	3	0	—	2.5× / 0.4
Icebergs · Indian Ocean	1	3	0	—	0.8× / 1.2
Quakes · Malacca Strait	1	3	0	—	5.0× / 0.2
Quakes · Philippine Sea	1	3	0	—	0.7× / 1.4
Incidents · Solomon Sea	1	3	0	—	5.0× / 0.2
Debris · South China Sea	1	3	0	—	5.0× / 0.2
Containers · South Pacific Ocean	1	3	0	—	2.5× / 0.4
Quakes · The Northwestern Passages	1	3	0	—	new / 0
Other · South Pacific Ocean	1	2.9	0	—	1.7× / 0.6
Incidents · Banda Sea	1	2.4	1	2	5.0× / 0.2
Incidents · Andaman or Burma Sea	1	2	0	—	2.5× / 0.4
Exercises · Alboran Sea	1	1.5	1	1	2.5× / 0.4
Wrecks · North Atlantic Ocean	1	1.4	1	1	new / 0
Piracy · North Atlantic Ocean	1	1	1	0	new / 0
Restricted · North Atlantic Ocean	1	1	0	—	5.0× / 0.2
Exercises · Bering Sea	1	0.9	0	—	2.5× / 0.4
Nav aids · Japan Sea	1	0.3	0	—	new / 0
Incidents · Arafura Sea	1	0.2	0	—	2.5× / 0.4
Incidents · Bass Strait	1	0.1	0	—	2.5× / 0.4
Other · Red Sea	1	0.1	1	0	new / 0
Volcanic · South Pacific Ocean	1	0.1	1	0	2.5× / 0.4
Incidents · Timor Sea	1	0.1	0	—	1.7× / 0.6
Restricted · North Sea	0	267.9	0	—	0.0× / 0.4
Surveys · Arctic Oceanlong running	0	248	8	2,290	— / 0
Wrecks · South China Sealong running	0	222.8	7	995	— / 0
Surveys · Beaufort Sealong running	0	217	7	2,365	— / 0
Wrecks · Arabian Sealong running	0	210.5	5	1,219	— / 0
Nav aids · South Pacific Ocean	0	202	4	158	0.0× / 0.6
Other · South China Sealong running	0	120.8	3	797	0.0× / 0.4
Surveys · Davis Straitlong running	0	117.5	2	492	— / 0
Nav aids · Sea of Okhotsklong running	0	117.5	2	1,869	0.0× / 0.2
Restricted · Black Sealong running	0	115.6	2	1,336	0.0× / 0.6
Surveys · Bering Sea	0	93	3	205	— / 0
Cable ops · Gulf of Mexico	0	93	3	92	0.0× / 1.8
Wrecks · The Northwestern Passageslong running	0	89.7	2	511	— / 0
Structures · Persian Gulf	0	86.5	1	194	— / 0
Wrecks · Solomon Sea	0	83.3	0	—	— / 0
Wrecks · English Channel	0	80.4	0	—	0.0× / 0.6
Surveys · Indian Oceanlong running	0	68.9	1	392	0.0× / 1.6
Nav aids · Gulf of California	0	62	2	223	— / 0
Wrecks · Hudson Bay	0	62	2	42	— / 0
Nav aids · Kara Sealong running	0	62	2	376	0.0× / 0.4
Nav aids · Malacca Straitlong running	0	62	2	463	— / 0
War risk · Mediterranean Sea - Eastern Basinlong running	0	62	2	2,078	— / 0
Surveys · Persian Gulf	0	62	2	323	0.0× / 0.2
Other · Sea of Azov	0	62	2	186	— / 0
Surveys · The Northwestern Passageslong running	0	62	2	1,639	— / 0
Nav aids · Bass Straitlong running	0	58.8	1	1,401	0.0× / 0.6
Wrecks · Celtic Sealong running	0	57.8	1	519	— / 0
Nav aids · Laccadive Sea	0	55.5	0	—	0.0× / 0.2
Nav aids · Andaman or Burma Sea	0	51.7	0	—	0.0× / 0.2
Surveys · Black Sea	0	46	1	56	0.0× / 0.6
Wrecks · South Atlantic Ocean	0	43.4	0	—	0.0× / 0.6
Nav aids · Great Australian Bightlong running	0	36.8	1	699	0.0× / 0.4
Surveys · Andaman or Burma Sea	0	31	1	42	0.0× / 0.2
Restricted · Baltic Sea	0	31	1	138	— / 0
Other · Beaufort Sea	0	31	1	119	— / 0
Cable ops · Black Sea	0	31	1	161	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2017-01, 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.