Sea Ledger, November 2016

2016-11-01 to 2016-11-30 · archive

issued: 663
warning-days in force: 13,667
in force at month end: 484
sea × type cells: 252

baseline: same month, previous 5 years (2015-11, 2014-11, 2013-11, 2012-11, 2011-11)

By type

type	issued	warning-days	in force at end
Incidents	176	1,827.9	85
Exercises	116	1,389.6	46
Nav aids	86	3,641	118
Icebergs	60	64.9	3
Surveys	52	2,086.1	62
Quakes	41	117.5	3
Cable ops	29	910.7	30
Missiles	24	229.4	8
Derelicts	22	208.6	10
Spills	17	258	13
Piracy	12	160.6	10
Other	10	632	26
Wrecks	6	1,179.9	40
Debris	5	13	0
Towing	2	19.9	0
Containers	2	6	0
Restricted	1	530.4	17
Ordnance	1	120.9	4
Mines	1	0.2	0
War risk	0	60	2
Volcanic	0	60	2
Structures	0	120	4
Storms	0	30	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · North Pacific Ocean	32	246.5	10	38	1.0× / 32.2
Icebergs · South Atlantic Oceansurge	30	30.1	1	30	13× / 2.4
Incidents · South China Sea	29	214.6	12	49	1.8× / 16
Incidents · Mediterranean Sea - Eastern Basinsurge	27	543.9	26	49	3.8× / 7.2
Nav aids · North Sealong running	25	305.7	9	375	1.8× / 14.2
Exercises · North Pacific Ocean	23	133.1	5	34	1.6× / 14.4
Icebergs · Hudson Straitsurge	21	24.2	0	—	5.3× / 4
Quakes · South Pacific Oceansurge	20	60	0	—	2.2× / 9
Incidents · North Atlantic Ocean	16	201.2	11	41	0.9× / 17
Exercises · South Atlantic Ocean	15	75.3	7	27	1.1× / 14
Exercises · Bay of Bengal	15	69.1	2	29	1.7× / 9
Surveys · South Atlantic Oceansurge	12	234.1	6	182	3.0× / 4
Exercises · Mediterranean Sea - Eastern Basinsurge	12	50.2	2	23	3.0× / 4
Nav aids · South Atlantic Ocean	10	425.3	14	181	1.3× / 7.8
Quakes · North Pacific Ocean	10	26.9	1	19	1.4× / 7
Incidents · South Pacific Ocean	9	101.4	4	45	1.3× / 7
Cable ops · South Atlantic Ocean	9	73.4	3	32	0.4× / 22.4
Exercises · Black Sea	8	170.2	9	92	1.9× / 4.2
Incidents · South Atlantic Ocean	8	36.6	2	48	1.6× / 5
Surveys · Inner Seas off the West Coast of Scotlandnew	8	19.9	0	—	new / 0
Nav aids · North Pacific Oceansurge	7	168.9	6	200	3.2× / 2.2
Incidents · Caribbean Sea	7	111.7	4	56	1.4× / 5.2
Spills · North Atlantic Oceansurge	7	95	2	24	8.8× / 0.8
Exercises · Arabian Sea	7	60.1	0	—	0.9× / 7.6
Incidents · Philippine Seasurge	7	45.9	3	45	2.7× / 2.6
Icebergs · Davis Strait	7	8.3	0	—	1.3× / 5.4
Surveys · North Atlantic Oceansurgelong running	6	226.9	6	911	5.0× / 1.2
Nav aids · English Channelsurge	6	34.6	2	168	2.0× / 3
Incidents · Coral Seasurge	6	33.6	1	44	2.7× / 2.2
Surveys · Celtic Seasurge	6	12.8	1	76	2.0× / 3
Surveys · Gulf of Suezsurge	5	129.8	1	36	3.1× / 1.6
Incidents · Gulf of Mexico	5	57.8	5	36	1.7× / 3
Missiles · North Pacific Ocean	5	46.5	2	31	0.8× / 6.2
Missiles · Barentsz Sea	5	44.7	0	—	1.4× / 3.6
Exercises · Laccadive Seasurge	5	41.2	1	29	2.8× / 1.8
Exercises · Yellow Sea	5	21.6	0	—	0.5× / 11.2
Quakes · Indian Oceansurge	5	14.7	1	23	2.8× / 1.8
Nav aids · North Atlantic Oceanlong running	4	234.6	8	1,288	0.8× / 4.8
Exercises · South China Sea	4	162	2	34	1.1× / 3.8
Missiles · Black Sea	4	62.9	3	31	1.5× / 2.6
Nav aids · Inner Seas off the West Coast of Scotland	4	52.8	1	49	0.9× / 4.2
Spills · Gulf of Mexico	4	52	4	41	1.8× / 2.2
Spills · North Pacific Oceannew	4	49	4	38	new / 0
Piracy · Sulu Seanew	4	31.3	4	10	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbiasurge	4	30.5	1	63	4.0× / 1
Piracy · Gulf of Guineasurge	4	22.3	2	11	3.3× / 1.2
Incidents · Java Seasurge	4	14.5	1	23	20× / 0.2
Exercises · Aegean Sea	3	337.2	11	338	0.9× / 3.4
Nav aids · South Pacific Oceansurge	3	185.2	6	96	7.5× / 0.4
Nav aids · Coral Sealong running	3	138.2	5	957	1.0× / 3
Nav aids · Arabian Seasurgelong running	3	100.4	3	583	5.0× / 0.6
Surveys · Arabian Sea	3	73.5	3	30	1.7× / 1.8
Surveys · Mediterranean Sea - Eastern Basin	3	72.3	3	36	1.7× / 1.8
Exercises · Philippine Sea	3	70.5	2	34	1.1× / 2.8
Nav aids · Bass Straitsurgelong running	3	70.3	2	1,339	5.0× / 0.6
Derelicts · South Pacific Oceanlong running	3	66.5	3	1,617	1.9× / 1.6
Surveys · Indian Oceansurge	3	64.5	3	330	7.5× / 0.4
Nav aids · Celtic Seasurgelong running	3	63.9	1	1,497	2.1× / 1.4
Derelicts · Indian Ocean	3	38.7	2	44	1.1× / 2.8
Piracy · Celebes Seanew	3	37.8	2	16	new / 0
Incidents · Indian Ocean	3	23.4	2	19	0.5× / 5.8
Derelicts · North Atlantic Ocean	3	16.5	0	—	0.6× / 5
Incidents · Tasman Seasurge	3	14	0	—	15× / 0.2
Missiles · North Atlantic Ocean	3	13.3	1	18	0.8× / 3.8
Exercises · Baltic Sea	3	12.3	0	—	1.4× / 2.2
Derelicts · Caribbean Seasurge	3	8.4	1	26	5.0× / 0.6
Incidents · Gulf of Thailandsurge	3	8	0	—	2.1× / 1.4
Cable ops · Norwegian Seanew	3	7	0	—	new / 0
Incidents · Arafura Seasurge	3	0.6	0	—	3.0× / 1
Nav aids · Gulf of Mexicolong running	2	244.7	8	1,019	0.5× / 3.8
Surveys · Bay of Bengal	2	135.9	4	145	5.0× / 0.4
Nav aids · Indian Oceanlong running	2	122.4	5	1,015	1.7× / 1.2
Cable ops · Gulf of Mexico	2	114.2	3	48	2.0× / 1
Other · Davis Straitnew	2	86.3	4	94	new / 0
Cable ops · South China Sea	2	60	2	71	0.9× / 2.2
Exercises · North Atlantic Ocean	2	38.9	1	72	0.3× / 5.8
Other · Coral Sealong running	2	33.1	1	595	10× / 0.2
Exercises · Gulf of Mexico	2	31.6	0	—	1.3× / 1.6
Towing · Black Seanew	2	19.9	0	—	new / 0
Incidents · Singapore Strait	2	15.3	0	—	3.3× / 0.6
Cable ops · Eastern China Sea	2	14	2	7	2.5× / 0.8
Nav aids · Irish Sea and St. George's Channel	2	12.3	1	45	0.5× / 4
Exercises · Indian Ocean	2	6.9	1	26	0.8× / 2.4
Derelicts · South China Sea	2	6	0	—	1.1× / 1.8
Derelicts · South Atlantic Ocean	2	4.2	0	—	2.5× / 0.8
Debris · Timor Sea	2	4	0	—	1.7× / 1.2
Quakes · Banda Sea	2	3.9	1	13	2.5× / 0.8
Incidents · Molukka Sea	2	2.6	0	—	5.0× / 0.4
Icebergs · Labrador Sea	2	2.3	2	31	0.2× / 12.8
Wrecks · South China Sealong running	1	198.1	7	933	5.0× / 0.2
Other · South China Sealong running	1	120.5	4	735	1.0× / 1
Cable ops · Philippine Sea	1	115.8	4	119	1.7× / 0.6
Nav aids · Laccadive Sea	1	109.3	3	351	1.3× / 0.8
Cable ops · North Atlantic Ocean	1	99.5	3	116	0.1× / 7.2
Wrecks · Irish Sea and St. George's Channellong running	1	90	3	530	5.0× / 0.2
Surveys · Caribbean Sealong running	1	81.3	2	397	2.5× / 0.4
Nav aids · Great Australian Bightlong running	1	60.2	2	637	1.7× / 0.6
Wrecks · Celtic Sealong running	1	60	2	457	5.0× / 0.2
Nav aids · Mozambique Channellong running	1	59.2	2	568	5.0× / 0.2
Cable ops · Arabian Sea	1	43.3	2	181	1.3× / 0.8
Other · North Atlantic Oceanlong running	1	43.2	2	1,115	0.4× / 2.6
Wrecks · Caribbean Sea	1	37.3	2	137	new / 0
Missiles · Aegean Sea	1	35.4	1	334	1.0× / 1
Derelicts · Laccadive Sea	1	34.1	1	30	5.0× / 0.2
Surveys · South Pacific Ocean	1	32.1	1	32	new / 0
Nav aids · Mediterranean Sea - Eastern Basin	1	31	1	233	2.5× / 0.4
Surveys · Black Sea	1	30	1	33	new / 0
Wrecks · North Pacific Ocean	1	28.1	1	28	new / 0
Incidents · Davis Strait	1	27	1	26	1.3× / 0.8
Derelicts · Bay of Bengal	1	26.4	1	26	1.0× / 1
Incidents · Celebes Sea	1	19.8	1	19	2.5× / 0.4
Surveys · Japan Sea	1	19.6	1	19	new / 0
Incidents · Tyrrhenian Sea	1	17.4	1	17	1.0× / 1
Incidents · Celtic Sea	1	16.6	1	16	5.0× / 0.2
Spills · Gulf of Alaska	1	16	1	32	5.0× / 0.2
Cable ops · Flores Sea	1	15.8	0	—	new / 0
Spills · Bering Sea	1	14	1	14	1.7× / 0.6
Other · Gulf of Mexico	1	13.3	1	13	1.7× / 0.6
Cable ops · Banda Sea	1	12.6	1	12	new / 0
Cable ops · Mediterranean Sea - Eastern Basin	1	11.5	1	11	0.5× / 2.2
Missiles · Arctic Ocean	1	10.5	0	—	2.5× / 0.4
Cable ops · Gulf of Guinea	1	8	0	—	0.3× / 3
Missiles · South Pacific Ocean	1	6.4	0	—	1.0× / 1
Piracy · South Atlantic Ocean	1	6	1	6	new / 0
Restricted · South Atlantic Ocean	1	5.4	0	—	new / 0
Missiles · Laccadive Sea	1	4.8	0	—	0.8× / 1.2
Exercises · Barentsz Sea	1	4.7	0	—	5.0× / 0.2
Exercises · South Pacific Ocean	1	4.6	0	—	0.3× / 3.8
Nav aids · Southern Ocean	1	4.5	1	4	2.5× / 0.4
Cable ops · North Pacific Ocean	1	4	0	—	1.7× / 0.6
Missiles · Kara Sea	1	3.8	0	—	new / 0
Exercises · Coral Sea	1	3.1	0	—	0.3× / 3
Debris · Arafura Sea	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.0× / 1
Derelicts · Celtic Sea	1	3	0	—	new / 0
Containers · English Channel	1	3	0	—	5.0× / 0.2
Containers · Mediterranean Sea - Eastern Basin	1	3	0	—	new / 0
Debris · North Atlantic Ocean	1	3	0	—	0.6× / 1.6
Quakes · Philippine Sea	1	3	0	—	1.0× / 1
Quakes · Solomon Sea	1	3	0	—	0.5× / 2
Debris · Tasman Sea	1	3	0	—	new / 0
Derelicts · Tasman Sea	1	3	0	—	5.0× / 0.2
Quakes · Tasman Sea	1	3	0	—	new / 0
Exercises · Celtic Sea	1	2.8	0	—	5.0× / 0.2
Other · Laccadive Sea	1	2.6	1	2	5.0× / 0.2
Cable ops · Sea of Marmara	1	2.3	0	—	new / 0
Incidents · Gulf of Guinea	1	1.9	0	—	new / 0
Exercises · Japan Sea	1	1.9	0	—	new / 0
Other · English Channel	1	1.6	1	1	2.5× / 0.4
Other · Caribbean Sea	1	1.4	1	1	2.5× / 0.4
Exercises · Caribbean Sea	1	1.3	0	—	1.0× / 1
Derelicts · Mediterranean Sea - Western Basin	1	1.2	1	1	5.0× / 0.2
Exercises · Bering Sea	1	1	0	—	1.0× / 1
Missiles · Greenland Sea	1	0.9	1	0	new / 0
Ordnance · Philippine Sea	1	0.9	0	—	5.0× / 0.2
Incidents · Bay of Biscay	1	0.8	0	—	5.0× / 0.2
Incidents · Bismarck Sea	1	0.8	0	—	5.0× / 0.2
Cable ops · English Channel	1	0.6	1	0	new / 0
Wrecks · North Atlantic Ocean	1	0.6	0	—	new / 0
Derelicts · Solomon Sea	1	0.6	1	0	new / 0
Cable ops · Persian Gulf	1	0.4	1	0	1.0× / 1
Mines · English Channel	1	0.2	0	—	new / 0
Incidents · Great Australian Bight	1	0.2	0	—	5.0× / 0.2
Missiles · Philippine Sea	1	0.2	0	—	1.7× / 0.6
Incidents · Timor Sea	1	0.1	0	—	1.3× / 0.8
Incidents · Bering Sea	1	0	0	—	new / 0
Nav aids · Caribbean Sealong running	0	489.4	15	1,024	0.0× / 0.4
Restricted · North Sealong running	0	300	10	1,714	— / 0
Surveys · Arctic Oceanlong running	0	240	8	2,228	— / 0
Wrecks · Arabian Sealong running	0	210	7	1,157	— / 0
Surveys · Beaufort Sealong running	0	210	7	2,303	— / 0
Nav aids · Bay of Bengallong running	0	127.5	4	414	0.0× / 1.2
Surveys · Davis Straitlong running	0	120	4	430	— / 0
Nav aids · Sea of Okhotsklong running	0	120	4	1,807	— / 0
Surveys · Bering Sea	0	90	3	143	— / 0
Restricted · Black Sealong running	0	90	3	1,274	0.0× / 0.2
Wrecks · English Channellong running	0	90	3	456	0.0× / 0.6
Exercises · Ionian Sea	0	90	3	333	0.0× / 0.4
Structures · Persian Gulf	0	90	3	132	— / 0
Wrecks · Solomon Sealong running	0	90	3	631	— / 0
Wrecks · The Northwestern Passageslong running	0	90	3	449	— / 0
Wrecks · Andaman or Burma Sealong running	0	60	2	426	— / 0
Other · Arabian Sea	0	60	2	103	0.0× / 0.4
Ordnance · Black Sea	0	60	2	168	— / 0
Nav aids · Gulf of California	0	60	2	161	0.0× / 0.4
Nav aids · Kara Sea	0	60	2	314	— / 0
Nav aids · Malacca Straitlong running	0	60	2	401	— / 0
War risk · Mediterranean Sea - Eastern Basinlong running	0	60	2	2,016	— / 0
Surveys · Persian Gulf	0	60	2	261	— / 0
Other · Sea of Azov	0	60	2	242	— / 0
Other · South Atlantic Oceanlong running	0	60	2	1,122	0.0× / 2.4
Surveys · South China Sea	0	60	2	194	— / 0
Cable ops · Tasman Sea	0	60	2	42	— / 0
Nav aids · Tasman Sea	0	60	2	183	0.0× / 1.2
Surveys · The Northwestern Passageslong running	0	60	2	1,577	— / 0
Cable ops · Barentsz Sea	0	49.5	0	—	— / 0
Wrecks · South Atlantic Ocean	0	45.8	1	122	0.0× / 0.2
Nav aids · Arafura Sea	0	32.3	1	160	0.0× / 0.2
Nav aids · Andaman or Burma Sea	0	30	1	64	— / 0
Surveys · Andaman or Burma Sea	0	30	1	41	0.0× / 0.4

Cite: seahazards.com Sea Ledger, 2016-11, 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.