Sea Ledger, July 2016

2016-07-01 to 2016-07-31 · archive

issued: 611
warning-days in force: 12,013
in force at month end: 375
sea × type cells: 248

baseline: same month, previous 5 years (2015-07, 2014-07, 2013-07, 2012-07, 2011-07)

By type

type	issued	warning-days	in force at end
Incidents	160	1,106.9	24
Exercises	103	1,326.5	39
Nav aids	67	3,035.4	102
Icebergs	63	81.6	3
Cable ops	43	1,249.7	44
Quakes	35	99.5	5
Derelicts	29	144.9	2
Surveys	29	1,802.9	57
Other	19	603.1	14
Spills	18	301.8	14
Missiles	17	202.3	4
Debris	6	18	0
Piracy	6	36.2	0
Wrecks	5	899.3	30
Restricted	5	548	20
Ordnance	4	292.4	9
Structures	1	105.1	3
Containers	1	4.4	0
War risk	0	62	2
Volcanic	0	93	3

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · North Pacific Ocean	30	75.3	1	30	1.2× / 24.4
Icebergs · South Atlantic Oceansurge	30	41.1	1	31	9.4× / 3.2
Exercises · North Pacific Ocean	24	171.2	6	65	1.6× / 15.2
Incidents · South China Sea	22	178.3	6	49	1.4× / 15.6
Icebergs · Labrador Sea	22	23.2	2	27	1.6× / 14.2
Exercises · Yellow Sea	18	101.2	3	37	1.5× / 12.2
Incidents · North Atlantic Ocean	16	187.8	4	73	1.3× / 12.2
Exercises · Black Sea	16	163.8	4	61	1.6× / 9.8
Quakes · South Pacific Ocean	14	42	0	—	1.1× / 13.2
Incidents · Mediterranean Sea - Eastern Basin	13	77.4	0	—	0.9× / 14.8
Nav aids · North Atlantic Oceansurgelong running	11	208.9	8	1,166	2.0× / 5.4
Incidents · Caribbean Seasurge	11	109.4	2	32	3.9× / 2.8
Icebergs · North Atlantic Oceansurge	10	14.3	0	—	10× / 1
Surveys · South Atlantic Oceansurge	9	234.8	6	60	2.0× / 4.4
Nav aids · North Sea	9	200.5	7	253	0.9× / 9.8
Incidents · Coral Sea	9	5.2	0	—	1.8× / 5
Spills · Gulf of Mexicosurge	8	90	6	35	2.0× / 4
Cable ops · North Atlantic Ocean	7	186.7	6	147	0.9× / 8
Cable ops · North Sea	6	91.2	6	56	1.1× / 5.4
Incidents · Gulf of Mexico	6	71.7	1	40	1.8× / 3.4
Incidents · Indian Ocean	6	28.4	0	—	0.5× / 13
Nav aids · Gulf of Mexicolong running	5	245.8	8	897	1.6× / 3.2
Cable ops · Norwegian Sea	5	206.9	5	93	1.0× / 5
Exercises · Philippine Sea	5	125	2	35	1.2× / 4.2
Incidents · South Atlantic Ocean	5	108	2	48	1.0× / 4.8
Incidents · South Pacific Ocean	5	104.6	2	50	0.6× / 7.8
Nav aids · Inner Seas off the West Coast of Scotlandsurge	5	51.6	2	31	2.3× / 2.2
Missiles · North Pacific Ocean	5	35.9	1	39	0.9× / 5.8
Nav aids · Gulf of Alaskasurge	5	19	1	24	3.6× / 1.4
Incidents · Mozambique Channelsurge	5	18.7	1	35	8.3× / 0.6
Incidents · Philippine Sea	5	16.6	0	—	1.8× / 2.8
Exercises · North Atlantic Oceansurge	5	10.9	1	28	2.5× / 2
Derelicts · Timor Seanew	5	9.9	0	—	new / 0
Incidents · Timor Seasurge	5	1.4	0	—	13× / 0.4
Nav aids · North Pacific Oceanlong running	4	215.1	7	549	1.3× / 3
Exercises · South China Sea	4	81.6	2	35	1.0× / 4
Spills · North Pacific Oceansurge	4	71	1	39	3.3× / 1.2
Cable ops · Kara Seasurge	4	52	3	25	2.0× / 2
Surveys · North Seasurge	4	46.4	2	23	4.0× / 1
Incidents · Mediterranean Sea - Western Basinsurge	4	43.2	1	35	5.0× / 0.8
Exercises · South Atlantic Ocean	4	23.3	0	—	0.7× / 5.4
Derelicts · North Atlantic Ocean	4	22.2	0	—	1.8× / 2.2
Restricted · South Atlantic Oceannew	4	20	3	12	new / 0
Quakes · Coral Seasurge	4	15.4	0	—	2.2× / 1.8
Exercises · Mediterranean Sea - Eastern Basin	4	11.4	0	—	0.6× / 6.4
Missiles · North Atlantic Ocean	4	10.1	0	—	0.5× / 8
Incidents · Bay of Bengal	4	10	1	14	1.4× / 2.8
Ordnance · Sea of Azovsurge	3	124.9	4	121	5.0× / 0.6
Cable ops · Gulf of Mexico	3	111.5	3	59	1.7× / 1.8
Cable ops · Bay of Bengalnew	3	74.7	3	178	new / 0
Cable ops · Sea of Okhotsksurge	3	64.6	3	82	3.0× / 1
Exercises · Arabian Sea	3	58.6	1	50	1.0× / 3
Cable ops · South China Sea	3	44.9	3	93	0.6× / 5
Spills · Bering Seasurge	3	40	3	32	3.0× / 1
Exercises · Bay of Bengal	3	37.9	1	37	0.7× / 4.2
Nav aids · Gulf of Sueznew	3	29.7	1	27	new / 0
Other · North Pacific Oceansurge	3	25.4	1	23	2.1× / 1.4
Piracy · Gulf of Guineasurge	3	16.5	0	—	3.8× / 0.8
Derelicts · Gulf of Mexicosurge	3	13.1	0	—	5.0× / 0.6
Exercises · Baltic Sea	3	11	1	18	1.1× / 2.6
Quakes · Indian Ocean	3	9	0	—	1.4× / 2.2
Debris · North Pacific Oceansurge	3	9	0	—	15× / 0.2
Quakes · North Pacific Ocean	3	9	0	—	0.4× / 8.4
Incidents · Celtic Seasurge	3	5.1	1	5	15× / 0.2
Exercises · Aegean Sea	2	339.5	11	216	3.3× / 0.6
Nav aids · South Atlantic Ocean	2	270.9	6	191	0.3× / 6.8
Surveys · Beaufort Sealong running	2	258.9	9	2,181	10× / 0.2
Wrecks · South China Sealong running	2	134.9	4	811	3.3× / 0.6
Nav aids · Coral Sealong running	2	125.2	4	835	1.1× / 1.8
Cable ops · Barentsz Sea	2	78.3	3	66	1.4× / 1.4
Surveys · Mediterranean Sea - Eastern Basin	2	72.4	2	66	1.3× / 1.6
Nav aids · Arabian Sealong running	2	70.8	2	461	3.3× / 0.6
Missiles · Black Sea	2	66.4	2	31	10× / 0.2
Surveys · Bering Sealong running	2	51.4	2	391	2.0× / 1
Other · Black Seanew	2	33	1	210	new / 0
Exercises · Gulf of Mexico	2	29.9	2	32	1.3× / 1.6
Other · English Channel	2	23.6	0	—	10× / 0.2
Cable ops · South Atlantic Ocean	2	22.4	1	16	0.1× / 16
Nav aids · Davis Strait	2	20.1	2	10	3.3× / 0.6
Surveys · Kara Sea	2	18.7	1	19	2.0× / 1
Derelicts · Indian Ocean	2	13.2	0	—	0.4× / 5.2
Nav aids · Irish Sea and St. George's Channel	2	10.1	2	9	0.9× / 2.2
Derelicts · Laccadive Sea	2	8	0	—	3.3× / 0.6
Derelicts · North Pacific Ocean	2	7.9	0	—	0.6× / 3.4
Missiles · Sea of Okhotsknew	2	6.9	0	—	new / 0
Quakes · North Atlantic Ocean	2	6	0	—	1.7× / 1.2
Derelicts · South Atlantic Ocean	2	6	0	—	1.4× / 1.4
Other · Tasman Seanew	2	5.5	0	—	new / 0
Derelicts · South China Sea	2	5.4	0	—	1.7× / 1.2
Derelicts · Caribbean Sea	2	5.3	1	28	3.3× / 0.6
Exercises · Bering Sea	2	4.6	0	—	1.1× / 1.8
Exercises · Coral Sea	2	4.5	0	—	0.8× / 2.4
Exercises · Caribbean Sea	2	4.4	0	—	10× / 0.2
Quakes · Solomon Sea	2	4.4	1	19	1.1× / 1.8
Quakes · Philippine Sea	2	4.2	2	2	2.5× / 0.8
Quakes · South Atlantic Ocean	2	3.5	1	5	2.5× / 0.8
Nav aids · Caribbean Sealong running	1	339.1	11	902	0.5× / 2
Surveys · North Atlantic Oceanlong running	1	210.9	5	789	0.4× / 2.4
Nav aids · Indian Oceanlong running	1	137.1	4	893	0.3× / 3
Ordnance · North Sea	1	124	4	327	5.0× / 0.2
Nav aids · Sea of Okhotsklong running	1	117.5	4	1,685	new / 0
Nav aids · Tasman Sea	1	80.7	3	61	1.7× / 0.6
Wrecks · Caribbean Sealong running	1	77.9	3	656	new / 0
Nav aids · Great Australian Bightlong running	1	63.9	2	515	1.7× / 0.6
Other · Sea of Azov	1	61.6	2	120	new / 0
Nav aids · Mediterranean Sea - Western Basin	1	57.5	2	65	new / 0
Other · Caribbean Sealong running	1	49.5	1	558	5.0× / 0.2
Other · North Atlantic Oceanlong running	1	49	1	993	1.3× / 0.8
Nav aids · The Northwestern Passages	1	47.3	2	311	0.8× / 1.2
Surveys · Gulf of Mexico	1	41.9	2	251	0.8× / 1.2
Nav aids · Alboran Sea	1	38	2	131	5.0× / 0.2
Nav aids · English Channel	1	36.6	1	46	0.5× / 2.2
Cable ops · Caribbean Sea	1	35	1	147	1.7× / 0.6
Derelicts · South Pacific Oceanlong running	1	34	1	1,495	0.6× / 1.8
Surveys · Bay of Bengal	1	33.6	1	51	5.0× / 0.2
Nav aids · Eastern China Sea	1	33	1	57	new / 0
Restricted · Sea of Azov	1	32	1	94	new / 0
Nav aids · Arafura Sea	1	31.4	1	38	0.6× / 1.6
Surveys · Laccadive Sea	1	31.2	1	60	new / 0
Other · Coral Sealong running	1	31.1	1	473	2.5× / 0.4
Incidents · Balearic (Iberian Sea)	1	30.4	0	—	5.0× / 0.2
Exercises · Laccadive Sea	1	30.1	1	34	0.5× / 2.2
Structures · Persian Gulflong running	1	29.1	1	370	2.5× / 0.4
Cable ops · Black Sea	1	29	1	28	0.7× / 1.4
Cable ops · Gulf of Suez	1	27.4	1	27	5.0× / 0.2
Surveys · Gulf of Suez	1	25.6	1	39	1.3× / 0.8
Spills · South China Sea	1	17.8	1	17	new / 0
Exercises · Sea of Okhotsk	1	16.3	1	56	5.0× / 0.2
Cable ops · Bering Sea	1	13.2	1	13	new / 0
Cable ops · Chukchi Sea	1	13.2	1	13	new / 0
Surveys · Celtic Sea	1	10	0	—	1.7× / 0.6
Spills · Gulf of Alaska	1	10	1	42	1.7× / 0.6
Missiles · Japan Sea	1	10	0	—	1.0× / 1
Surveys · Barentsz Sea	1	9.6	1	9	1.3× / 0.8
Piracy · South China Sea	1	9.3	0	—	1.0× / 1
Incidents · Yellow Sea	1	9	1	9	5.0× / 0.2
Incidents · Tyrrhenian Sea	1	8.9	0	—	1.0× / 1
Nav aids · South Pacific Ocean	1	7.8	0	—	0.5× / 2
Derelicts · Bay of Biscay	1	7.4	0	—	new / 0
Missiles · Bering Sea	1	6.7	0	—	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	6.7	0	—	1.0× / 1
Derelicts · Mozambique Channel	1	6.5	0	—	5.0× / 0.2
Other · The Northwestern Passages	1	6	0	—	1.7× / 0.6
Surveys · North Pacific Ocean	1	5.5	0	—	1.3× / 0.8
Piracy · North Atlantic Ocean	1	5.4	0	—	new / 0
Nav aids · Beaufort Sea	1	5.3	0	—	1.3× / 0.8
Other · South Pacific Ocean	1	5.1	0	—	5.0× / 0.2
Piracy · South Atlantic Ocean	1	5	0	—	new / 0
Other · Gulf of California	1	4.4	0	—	new / 0
Exercises · South Pacific Ocean	1	4.2	0	—	0.3× / 3.6
Exercises · Celtic Sea	1	4.1	0	—	5.0× / 0.2
Wrecks · South Pacific Ocean	1	4.1	0	—	new / 0
Missiles · Indian Ocean	1	4	0	—	2.5× / 0.4
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	4	1	4	1.0× / 1
Missiles · Laccadive Sea	1	3.9	0	—	1.0× / 1
Nav aids · Andaman or Burma Sea	1	3.4	1	3	new / 0
Derelicts · Bering Sea	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	0.6× / 1.6
Debris · Caribbean Sea	1	3	0	—	new / 0
Debris · Indian Ocean	1	3	0	—	1.7× / 0.6
Icebergs · Laptev Sea	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	new / 0
Debris · North Atlantic Ocean	1	3	0	—	5.0× / 0.2
Quakes · Sea of Okhotsk	1	3	0	—	5.0× / 0.2
Containers · Tasman Sea	1	3	0	—	new / 0
Other · North Sea	1	2.6	0	—	1.0× / 1
Incidents · Bismarck Sea	1	1.8	0	—	0.8× / 1.2
Incidents · Southern Ocean	1	1.8	0	—	new / 0
Incidents · Solomon Sea	1	1.1	0	—	1.3× / 0.8
Other · Hudson Strait	1	0.4	0	—	new / 0
Wrecks · South Atlantic Ocean	1	0.4	1	0	new / 0
Incidents · Tasman Sea	1	0.4	1	0	1.7× / 0.6
Other · Bering Sea	1	0.2	0	—	2.5× / 0.4
Incidents · Labrador Sea	1	0.2	0	—	new / 0
Incidents · Davis Strait	1	0.1	0	—	0.3× / 3.4
Incidents · Arafura Sea	1	0	0	—	1.0× / 1
Quakes · Flores Sea	1	0	1	0	new / 0
Incidents · Seto Naikai or Inland Sea	1	0	0	—	new / 0
Restricted · North Sealong running	0	310	10	1,592	0.0× / 1
Wrecks · Arabian Sealong running	0	186	6	1,035	0.0× / 0.4
Surveys · Arctic Oceanlong running	0	186	6	2,106	0.0× / 0.2
Nav aids · Bay of Bengal	0	124	4	292	0.0× / 0.2
Surveys · Davis Strait	0	124	4	308	— / 0
Restricted · Black Sealong running	0	93	3	1,152	0.0× / 0.8
Exercises · Ionian Sea	0	93	3	211	— / 0
Surveys · Sea of Okhotsk	0	93	3	54	0.0× / 0.6
Wrecks · Solomon Sealong running	0	93	3	509	— / 0
Other · South China Sealong running	0	93	3	613	0.0× / 1.4
Surveys · Persian Gulf	0	70	2	139	0.0× / 0.2
Cable ops · Sulu Sea	0	67	2	134	— / 0
Nav aids · Bass Straitlong running	0	62	2	1,217	0.0× / 0.8
Surveys · Caribbean Sea	0	62	2	275	— / 0
Nav aids · Celtic Sealong running	0	62	2	1,375	0.0× / 1.8
Wrecks · English Channel	0	62	2	334	0.0× / 0.8
Surveys · Indian Ocean	0	62	2	208	— / 0
Wrecks · Irish Sea and St. George's Channellong running	0	62	2	408	— / 0
Nav aids · Kara Sea	0	62	2	192	— / 0
Nav aids · Laccadive Sea	0	62	2	229	0.0× / 0.4
Nav aids · Malacca Strait	0	62	2	279	— / 0
War risk · Mediterranean Sea - Eastern Basinlong running	0	62	2	1,894	— / 0

Cite: seahazards.com Sea Ledger, 2016-07, 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.