Sea Ledger, October 2016

2016-10-01 to 2016-10-31 · archive

issued: 636
warning-days in force: 13,192
in force at month end: 417
sea × type cells: 259

baseline: same month, previous 5 years (2015-10, 2014-10, 2013-10, 2012-10, 2011-10)

By type

type	issued	warning-days	in force at end
Incidents	160	1,367.7	52
Exercises	89	1,243.5	35
Nav aids	81	3,630.1	116
Icebergs	64	73.1	3
Cable ops	45	1,190.9	35
Surveys	43	2,038.4	67
Missiles	37	351.7	7
Quakes	31	94.7	0
Derelicts	19	96.9	4
Storms	15	23.6	1
Spills	14	248	6
Other	10	628.4	19
Wrecks	9	1,092.2	39
Restricted	7	606	18
Piracy	5	69.9	3
Containers	2	6	0
Debris	2	6	0
Ordnance	2	173.1	4
Structures	1	128.1	4
War risk	0	62	2
Volcanic	0	62	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	32	33.4	1	32	8.9× / 3.6
Icebergs · Labrador Sea	31	36.7	2	32	1.4× / 21.6
Incidents · South China Sea	28	266	8	83	1.5× / 18.2
Incidents · North Pacific Ocean	22	110.5	6	45	0.8× / 26.4
Incidents · Mediterranean Sea - Eastern Basinsurge	21	216	12	40	2.3× / 9.2
Incidents · North Atlantic Ocean	18	198.8	6	58	1.6× / 11.6
Exercises · Black Seasurge	15	144.4	6	62	2.4× / 6.2
Surveys · South Atlantic Oceansurge	13	257.7	10	152	2.0× / 6.4
Storms · North Atlantic Oceannew	13	6.4	0	—	new / 0
Cable ops · South Atlantic Ocean	12	86.2	2	38	0.6× / 21.6
Quakes · South Pacific Ocean	12	37	0	—	1.3× / 9.6
Nav aids · North Sea	11	268.3	9	345	1.0× / 11.4
Exercises · South China Seasurge	11	150.2	5	47	2.3× / 4.8
Incidents · South Atlantic Ocean	11	69.5	3	55	2.0× / 5.6
Missiles · North Pacific Ocean	10	89.5	2	36	1.1× / 9.2
Nav aids · Inner Seas off the West Coast of Scotlandsurge	10	42.6	2	25	3.6× / 2.8
Incidents · South Pacific Ocean	10	38	4	55	1.4× / 7.2
Nav aids · South Atlantic Ocean	9	291.4	10	201	1.1× / 8
Exercises · North Pacific Ocean	8	79.4	2	36	0.5× / 17.2
Incidents · Indian Ocean	8	62	0	—	1.1× / 7.2
Exercises · Bay of Bengal	8	51.2	0	—	1.2× / 6.8
Missiles · Barentsz Seasurge	8	47	1	34	2.5× / 3.2
Spills · Gulf of Mexicosurge	7	120	2	41	2.7× / 2.6
Incidents · Caribbean Seasurge	7	68.6	3	27	2.1× / 3.4
Missiles · North Atlantic Ocean	7	28.7	0	—	1.9× / 3.6
Exercises · Aegean Seasurge	6	350.5	12	308	2.5× / 2.4
Nav aids · North Atlantic Oceanlong running	6	234.4	7	1,258	0.7× / 8.2
Surveys · Bay of Bengalsurge	6	123.9	5	115	10× / 0.6
Exercises · Philippine Sea	6	120.8	2	33	1.0× / 5.8
Incidents · Philippine Sea	6	60.8	1	37	1.4× / 4.4
Exercises · Arabian Sea	6	49.9	2	32	0.7× / 8.2
Derelicts · Indian Oceansurge	6	37.4	1	33	3.0× / 2
Nav aids · North Pacific Oceansurge	5	268.3	5	250	2.3× / 2.2
Nav aids · Gulf of Mexicosurgelong running	5	243.6	8	989	2.1× / 2.4
Cable ops · Gulf of Mexico	5	59.9	3	82	1.5× / 3.4
Incidents · Coral Sea	5	35.1	2	34	1.1× / 4.6
Exercises · Mediterranean Sea - Eastern Basin	5	13.3	0	—	1.0× / 5
Nav aids · The Northwestern Passagessurge	5	3.4	0	—	3.6× / 1.4
Surveys · North Atlantic Oceansurgelong running	4	183.6	7	881	6.7× / 0.6
Cable ops · North Sea	4	87.6	1	90	1.2× / 3.4
Incidents · Mediterranean Sea - Western Basinsurge	4	79.7	2	44	10× / 0.4
Nav aids · Irish Sea and St. George's Channelsurge	4	40.2	2	59	2.2× / 1.8
Quakes · North Pacific Ocean	4	12.7	0	—	0.7× / 5.4
Wrecks · South China Seasurgelong running	3	156.1	7	903	3.8× / 0.8
Nav aids · Coral Sealong running	3	150	4	927	1.4× / 2.2
Nav aids · South Pacific Ocean	3	126.8	5	66	1.9× / 1.6
Restricted · Black Seanewlong running	3	109.7	3	1,244	new / 0
Nav aids · Celtic Sealong running	3	83.8	2	1,467	1.9× / 1.6
Nav aids · Davis Straitnew	3	73	1	61	new / 0
Missiles · Black Sea	3	69.9	2	31	1.9× / 1.6
Cable ops · Philippine Seanew	3	68.3	3	89	new / 0
Exercises · North Atlantic Ocean	3	46.6	1	42	0.7× / 4.4
Exercises · South Atlantic Ocean	3	45.5	0	—	0.3× / 9.6
Surveys · Gulf of Suezsurge	3	32.3	1	18	3.0× / 1
Cable ops · Tasman Seanew	3	28	2	15	new / 0
Restricted · South China Seanew	3	19.7	1	20	new / 0
Incidents · Gulf of Mexico	3	15.4	1	20	1.3× / 2.4
Exercises · Barentsz Seasurge	3	14.8	0	—	2.5× / 1.2
Exercises · Baltic Sea	3	13.5	1	31	1.1× / 2.8
Derelicts · North Atlantic Ocean	3	6.3	1	18	0.7× / 4.6
Derelicts · Laccadive Seasurge	3	4.6	1	25	15× / 0.2
Incidents · Tasman Seasurge	3	0.4	0	—	2.5× / 1.2
Nav aids · Caribbean Sealong running	2	490.3	17	994	0.8× / 2.6
Cable ops · Kara Sea	2	164	5	66	5.0× / 0.4
Cable ops · North Atlantic Ocean	2	158.6	5	133	0.3× / 5.8
Surveys · Persian Gulf	2	87.7	2	231	5.0× / 0.4
Surveys · Indian Ocean	2	75.1	2	300	1.3× / 1.6
Cable ops · Barentsz Sea	2	64.8	3	49	10× / 0.2
Surveys · Arabian Sea	2	50.2	1	46	3.3× / 0.6
Surveys · Barentsz Sea	2	41.6	1	47	10× / 0.2
Spills · North Atlantic Ocean	2	34	0	—	1.0× / 2
Surveys · Black Sea	2	33.5	1	52	1.1× / 1.8
Incidents · Arabian Sea	2	33.3	2	50	0.9× / 2.2
Nav aids · Arafura Seanew	2	31.7	2	130	new / 0
Cable ops · Caribbean Sea	2	28.4	1	76	2.5× / 0.8
Spills · North Pacific Ocean	2	25	1	42	2.0× / 1
Cable ops · Celtic Sea	2	23.5	0	—	2.0× / 1
Incidents · Davis Strait	2	21.5	0	—	0.8× / 2.6
Cable ops · Eastern China Sea	2	18.4	0	—	10× / 0.2
Incidents · Timor Sea	2	18.4	0	—	2.0× / 1
Storms · Caribbean Sea	2	17.2	1	17	10× / 0.2
Missiles · Kara Sea	2	14.4	0	—	2.0× / 1
Missiles · Sea of Okhotsk	2	11.1	0	—	1.7× / 1.2
Missiles · Arctic Ocean	2	10.8	1	25	3.3× / 0.6
Exercises · South Pacific Ocean	2	7.4	0	—	0.4× / 5.2
Incidents · Banda Seanew	2	7.1	0	—	new / 0
Derelicts · South Atlantic Ocean	2	7.1	0	—	0.9× / 2.2
Cable ops · Mozambique Channel	2	6.9	0	—	10× / 0.2
Quakes · Molukka Sea	2	6	0	—	10× / 0.2
Quakes · North Atlantic Ocean	2	6	0	—	2.5× / 0.8
Quakes · Philippine Sea	2	6	0	—	0.8× / 2.4
Quakes · Solomon Sea	2	6	0	—	1.7× / 1.2
Exercises · Coral Sea	2	5	0	—	0.7× / 2.8
Exercises · Indian Ocean	2	4.7	0	—	3.3× / 0.6
Containers · Celtic Sea	2	4.5	0	—	10× / 0.2
Derelicts · North Pacific Ocean	2	3	0	—	0.7× / 3
Wrecks · Arabian Sealong running	1	197.6	7	1,127	1.3× / 0.8
Nav aids · Bay of Bengallong running	1	135.5	5	384	1.7× / 0.6
Other · South China Sealong running	1	115.5	4	705	0.6× / 1.8
Nav aids · Laccadive Sea	1	94.9	3	321	1.7× / 0.6
Wrecks · Irish Sea and St. George's Channellong running	1	76.2	3	500	5.0× / 0.2
Structures · Persian Gulf	1	75.6	3	102	new / 0
Surveys · Caribbean Sealong running	1	72.4	3	367	1.7× / 0.6
Nav aids · Great Australian Bightlong running	1	65.3	2	607	0.6× / 1.8
Nav aids · Bass Straitlong running	1	63	2	1,309	1.7× / 0.6
Cable ops · South China Sea	1	52.6	2	41	0.3× / 3.8
Other · Arabian Sea	1	49.5	2	73	1.7× / 0.6
Missiles · Aegean Sea	1	44.8	1	304	2.5× / 0.4
Wrecks · South Atlantic Ocean	1	44.6	2	92	2.5× / 0.4
Wrecks · Celtic Sealong running	1	43.3	2	427	new / 0
Cable ops · Bay of Bengal	1	41.2	1	93	1.7× / 0.6
Surveys · Inner Seas off the West Coast of Scotland	1	41.1	0	—	new / 0
Wrecks · Gulf of Mexicolong running	1	34	1	574	new / 0
Derelicts · South Pacific Oceanlong running	1	31.3	1	1,587	0.6× / 1.6
Nav aids · English Channel	1	31.2	1	138	0.3× / 3.6
Surveys · Mozambique Channel	1	31	1	35	5.0× / 0.2
Exercises · Laccadive Sea	1	30.9	0	—	0.5× / 2.2
Other · Beaufort Sea	1	27.9	1	27	new / 0
Cable ops · Sea of Okhotsk	1	25.6	1	25	5.0× / 0.2
Other · Sea of Okhotsk	1	24.1	1	24	new / 0
Cable ops · Gulf of Finland	1	21.4	1	65	new / 0
Other · Mediterranean Sea - Eastern Basin	1	18.2	0	—	0.7× / 1.4
Wrecks · Black Sea	1	18.1	1	18	new / 0
Piracy · Red Sea	1	18.1	0	—	5.0× / 0.2
Nav aids · Gulf of Suez	1	17.5	1	32	new / 0
Nav aids · Alboran Sea	1	16.7	0	—	new / 0
Restricted · South Atlantic Ocean	1	14.9	0	—	5.0× / 0.2
Missiles · South Atlantic Ocean	1	14.3	0	—	0.8× / 1.2
Spills · Philippine Sea	1	14	0	—	new / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	12	1	12	1.0× / 1
Surveys · Andaman or Burma Sea	1	11.6	1	11	new / 0
Other · Gulf of Mexico	1	11.6	0	—	1.3× / 0.8
Piracy · Malacca Strait	1	11	1	10	new / 0
Exercises · Caribbean Sea	1	10.5	0	—	1.7× / 0.6
Other · Bay of Bengal	1	9.9	0	—	5.0× / 0.2
Piracy · Indian Ocean	1	9.1	1	9	0.3× / 3.2
Piracy · Celebes Sea	1	9	0	—	new / 0
Incidents · Laccadive Sea	1	8.4	1	8	1.3× / 0.8
Ordnance · North Pacific Ocean	1	7	0	—	new / 0
Piracy · Gulf of Aden	1	6.5	1	6	1.3× / 0.8
Surveys · Mediterranean Sea - Eastern Basin	1	6.5	1	6	0.7× / 1.4
Exercises · North Sea	1	6	0	—	new / 0
Nav aids · Mediterranean Sea - Western Basin	1	5.9	0	—	1.3× / 0.8
Other · Irish Sea and St. George's Channel	1	5.2	0	—	new / 0
Missiles · South Pacific Ocean	1	4.6	0	—	0.4× / 2.8
Derelicts · Barentsz Sea	1	4.2	0	—	new / 0
Incidents · Solomon Sea	1	4.2	0	—	1.3× / 0.8
Exercises · Yellow Sea	1	3.5	1	3	0.1× / 13.4
Nav aids · Gulf of Guinea	1	3.4	1	3	new / 0
Quakes · Bismarck Sea	1	3	0	—	5.0× / 0.2
Quakes · Caribbean Sea	1	3	0	—	5.0× / 0.2
Other · Caribbean Sea	1	3	0	—	1.3× / 0.8
Quakes · Ionian Sea	1	3	0	—	new / 0
Quakes · Japan Sea	1	3	0	—	new / 0
Quakes · Java Sea	1	3	0	—	5.0× / 0.2
Icebergs · Kara Sea	1	3	0	—	5.0× / 0.2
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	1.7× / 0.6
Debris · North Atlantic Ocean	1	3	0	—	1.7× / 0.6
Debris · North Pacific Ocean	1	3	0	—	2.5× / 0.4
Quakes · South Atlantic Ocean	1	3	0	—	1.3× / 0.8
Quakes · Tyrrhenian Sea	1	3	0	—	new / 0
Surveys · South Pacific Ocean	1	2.4	1	2	new / 0
Spills · Gulf of Alaska	1	2	1	2	5.0× / 0.2
Incidents · Bismarck Sea	1	1.8	0	—	0.8× / 1.2
Incidents · Ligurian Sea	1	1.8	1	1	5.0× / 0.2
Incidents · Flores Sea	1	1.7	0	—	5.0× / 0.2
Exercises · Gulf of Mexico	1	1.4	0	—	0.6× / 1.6
Exercises · Bering Sea	1	1	0	—	2.5× / 0.4
Other · The Northwestern Passages	1	0.9	0	—	2.5× / 0.4
Ordnance · Celtic Sea	1	0.7	0	—	new / 0
Nav aids · Laptev Sea	1	0.5	1	0	5.0× / 0.2
Surveys · North Pacific Ocean	1	0.1	1	0	2.5× / 0.4
Incidents · Bass Strait	1	0	0	—	5.0× / 0.2
Restricted · North Sealong running	0	310	10	1,684	0.0× / 0.4
Surveys · Arctic Oceanlong running	0	248	8	2,198	0.0× / 2.6
Surveys · Beaufort Sealong running	0	243.7	7	2,273	0.0× / 1.8
Surveys · Davis Straitlong running	0	124	4	400	— / 0
Nav aids · Indian Oceanlong running	0	124	4	985	0.0× / 3.8
Nav aids · Sea of Okhotsklong running	0	124	4	1,777	0.0× / 0.2
Nav aids · Arabian Sealong running	0	93	3	553	0.0× / 0.6
Surveys · Bering Sea	0	93	3	113	— / 0
Wrecks · English Channellong running	0	93	3	426	0.0× / 0.2
Exercises · Ionian Sea	0	93	3	303	— / 0
Wrecks · Solomon Sealong running	0	93	3	601	— / 0
Wrecks · The Northwestern Passageslong running	0	93	3	419	— / 0
Nav aids · Tasman Sea	0	92	2	153	0.0× / 0.4
Other · South Atlantic Oceanlong running	0	75.6	2	1,092	0.0× / 0.4
Nav aids · Kara Sea	0	74.4	2	284	— / 0
Cable ops · Arabian Sea	0	70.7	1	151	0.0× / 0.6
Wrecks · Andaman or Burma Sealong running	0	62	2	396	0.0× / 0.2
Ordnance · Black Sea	0	62	2	138	— / 0
Other · Davis Strait	0	62	2	64	0.0× / 0.4
Nav aids · Gulf of California	0	62	2	131	0.0× / 0.2
Nav aids · Malacca Straitlong running	0	62	2	371	0.0× / 0.2
War risk · Mediterranean Sea - Eastern Basinlong running	0	62	2	1,986	— / 0
Other · Sea of Azov	0	62	2	212	— / 0
Surveys · South China Sea	0	62	2	164	0.0× / 0.2
Surveys · The Northwestern Passageslong running	0	62	2	1,547	— / 0
Ordnance · North Sealong running	0	59.5	1	419	0.0× / 0.8
Ordnance · Sea of Azov	0	43.9	1	213	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2016-10, 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.