Sea Ledger, August 2016

2016-08-01 to 2016-08-31 · archive

issued: 636
warning-days in force: 12,319
in force at month end: 397
sea × type cells: 252

baseline: same month, previous 5 years (2015-08, 2014-08, 2013-08, 2012-08, 2011-08)

By type

type	issued	warning-days	in force at end
Incidents	158	1,077	32
Exercises	109	1,258.4	41
Nav aids	78	3,208.1	107
Icebergs	62	75.3	3
Cable ops	43	1,323.1	47
Surveys	34	1,871.8	59
Derelicts	29	121	4
Quakes	29	90.6	3
Missiles	29	270.6	11
Other	18	583	17
Spills	16	326.4	7
Restricted	9	589.8	20
Debris	5	13.3	2
Ordnance	5	297	6
Wrecks	4	955.7	30
Piracy	4	14.9	0
Containers	3	6.8	1
Structures	1	95.5	3
War risk	0	62	2
Volcanic	0	78.3	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	31	39	1	31	8.6× / 3.6
Incidents · South China Sea	30	241.1	6	48	1.7× / 17.8
Incidents · North Pacific Ocean	26	100.4	3	38	1.0× / 27
Exercises · North Pacific Ocean	25	131.9	5	66	1.7× / 14.8
Icebergs · Labrador Sea	25	29.3	1	32	1.0× / 24.2
Exercises · Black Seasurge	19	193.3	8	92	3.3× / 5.8
Incidents · North Atlantic Ocean	16	212.8	4	54	1.6× / 10
Nav aids · North Sea	13	261.3	11	284	1.4× / 9.4
Incidents · South Atlantic Oceansurge	13	93.6	1	53	2.4× / 5.4
Exercises · North Atlantic Oceansurge	11	28.8	5	31	4.2× / 2.6
Surveys · South Atlantic Oceansurge	10	232.5	8	91	4.2× / 2.4
Incidents · Indian Ocean	9	26.4	1	29	0.8× / 11.4
Incidents · Mediterranean Sea - Eastern Basin	9	21.5	6	29	0.8× / 11.4
Cable ops · North Atlantic Ocean	8	220.1	8	178	0.9× / 8.4
Missiles · North Pacific Ocean	8	77.9	5	38	1.1× / 7
Quakes · South Pacific Ocean	8	18.9	2	19	0.8× / 9.6
Incidents · Coral Seasurge	8	4	0	—	2.4× / 3.4
Nav aids · Coral Seasurgelong running	7	131.6	4	866	2.1× / 3.4
Spills · Gulf of Mexico	7	123	3	44	1.9× / 3.6
Quakes · South Atlantic Oceansurge	7	23.3	1	31	4.4× / 1.6
Nav aids · South Atlantic Ocean	6	200.7	8	209	1.0× / 6
Surveys · North Atlantic Oceanlong running	6	180.7	5	820	1.4× / 4.4
Missiles · Black Seasurge	6	74.6	3	33	3.0× / 2
Missiles · North Atlantic Ocean	6	24.4	1	22	1.3× / 4.8
Exercises · Mediterranean Sea - Eastern Basin	6	19.8	1	26	1.4× / 4.4
Icebergs · North Atlantic Oceannew	6	7	1	6	new / 0
Nav aids · North Pacific Oceanlong running	5	239.6	9	580	1.9× / 2.6
Cable ops · North Sea	5	164.1	5	58	0.7× / 7.2
Exercises · Philippine Sea	5	104.8	2	35	1.0× / 5.2
Restricted · Black Seasurgelong running	5	104.5	4	1,183	25× / 0.2
Incidents · South Pacific Ocean	5	59.7	0	—	0.5× / 9.8
Derelicts · Indian Ocean	5	24.2	1	23	1.3× / 3.8
Derelicts · Bay of Bengalsurge	5	18.4	1	20	5.0× / 1
Incidents · Philippine Seasurge	5	16.7	2	16	2.5× / 2
Derelicts · North Atlantic Ocean	5	13	1	23	1.6× / 3.2
Exercises · Aegean Seasurge	4	371.4	11	247	20× / 0.2
Nav aids · North Atlantic Oceanlong running	4	226.2	7	1,197	0.8× / 4.8
Nav aids · Indian Oceanlong running	4	126.6	4	924	1.2× / 3.4
Cable ops · Kara Seasurge	4	114	5	56	2.5× / 1.6
Cable ops · Gulf of Mexico	4	97.3	2	65	1.4× / 2.8
Incidents · Gulf of Mexico	4	50.5	1	31	1.4× / 2.8
Spills · North Atlantic Ocean	4	45	1	21	1.1× / 3.6
Missiles · Barentsz Sea	4	30.7	1	23	1.2× / 3.4
Exercises · Bay of Bengal	4	24.9	1	33	0.8× / 5
Incidents · Bay of Biscaysurge	4	19.9	1	27	3.3× / 1.2
Quakes · North Pacific Ocean	4	12	0	—	0.5× / 7.6
Exercises · Bering Seasurge	4	4.4	0	—	2.5× / 1.6
Nav aids · Caribbean Seasurgelong running	3	361.4	13	933	7.5× / 0.4
Nav aids · Gulf of Mexicolong running	3	223.5	7	928	1.9× / 1.6
Ordnance · North Seasurge	3	120.1	1	358	15× / 0.2
Other · South Atlantic Oceansurgelong running	3	115	2	1,031	5.0× / 0.6
Nav aids · Laccadive Seasurge	3	100.8	4	260	15× / 0.2
Surveys · Barentsz Seasurge	3	56.1	1	40	7.5× / 0.4
Surveys · Gulf of Mexicosurge	3	48.9	2	282	7.5× / 0.4
Incidents · Caribbean Sea	3	48.1	2	42	0.6× / 4.8
Exercises · Arabian Sea	3	43	1	35	0.9× / 3.2
Incidents · Laccadive Seasurge	3	41.2	1	27	3.0× / 1
Incidents · Bay of Bengal	3	38.3	2	39	1.3× / 2.4
Nav aids · Irish Sea and St. George's Channel	3	37.9	1	40	1.1× / 2.8
Surveys · Gulf of Suezsurge	3	36.6	2	36	15× / 0.2
Exercises · Yellow Sea	3	33.7	0	—	0.3× / 10
Nav aids · Inner Seas off the West Coast of Scotland	3	23.8	0	—	1.5× / 2
Exercises · Caribbean Seasurge	3	18.5	0	—	5.0× / 0.6
Cable ops · Celtic Seasurge	3	15.4	1	16	5.0× / 0.6
Quakes · Indian Ocean	3	9	0	—	1.5× / 2
Exercises · South Atlantic Ocean	3	7.9	0	—	0.3× / 9
Debris · Celtic Seasurge	3	7.5	1	14	15× / 0.2
Exercises · Coral Sea	3	5.8	0	—	1.3× / 2.4
Other · Davis Straitsurge	3	5.8	2	17	5.0× / 0.6
Exercises · South Pacific Ocean	3	5	1	15	0.9× / 3.4
Nav aids · The Coastal Waters of Southeast Alaska and British Columbiasurge	3	4.8	1	27	3.8× / 0.8
Ordnance · Sea of Azovnew	2	145.9	4	152	new / 0
Other · South China Sealong running	2	121.1	3	644	2.0× / 1
Nav aids · Tasman Sea	2	96.5	3	92	1.1× / 1.8
Exercises · South China Sea	2	86.5	1	35	0.4× / 4.6
Other · North Atlantic Oceanlong running	2	74.6	2	1,024	1.0× / 2
Nav aids · Great Australian Bightlong running	2	64.9	2	546	2.5× / 0.8
Nav aids · Davis Strait	2	62	2	41	5.0× / 0.4
Surveys · Bay of Bengal	2	59.1	3	54	10× / 0.2
Cable ops · Chukchi Sea	2	56.4	2	44	10× / 0.2
Spills · Gulf of Alaska	2	35	0	—	3.3× / 0.6
Exercises · Laccadive Sea	2	33.8	1	32	0.9× / 2.2
Restricted · Sea of Azovnew	2	33	2	32	new / 0
Spills · North Pacific Ocean	2	28	1	43	1.4× / 1.4
Cable ops · South Atlantic Ocean	2	26.8	0	—	0.1× / 15
Incidents · Arabian Sea	2	21.2	1	26	1.7× / 1.2
Cable ops · Caribbean Sea	2	19.6	2	178	2.0× / 1
Missiles · White Sea	2	15.8	0	—	3.3× / 0.6
Incidents · Ionian Sea	2	13.5	0	—	3.3× / 0.6
Other · The Northwestern Passages	2	12.3	0	—	2.5× / 0.8
Nav aids · Gulf of Alaska	2	11.4	1	34	1.1× / 1.8
Surveys · Tasman Sea	2	11.3	1	26	5.0× / 0.4
Quakes · Philippine Sea	2	7.8	0	—	1.3× / 1.6
Nav aids · South Pacific Ocean	2	7.8	1	13	0.8× / 2.6
Derelicts · Caribbean Sea	2	6.7	0	—	1.1× / 1.8
Quakes · Banda Sea	2	6	0	—	2.5× / 0.8
Derelicts · South Atlantic Ocean	2	6	0	—	1.4× / 1.4
Exercises · Baltic Sea	2	4.5	0	—	1.1× / 1.8
Derelicts · Tasman Sea	2	3	0	—	2.5× / 0.8
Exercises · Persian Gulfnew	2	2.3	0	—	new / 0
Incidents · The Northwestern Passages	2	0.7	0	—	2.5× / 0.8
Incidents · Timor Sea	2	0.4	0	—	10× / 0.2
Surveys · Arctic Oceanlong running	1	213.1	7	2,137	1.0× / 1
Nav aids · Bay of Bengal	1	127.1	4	323	1.7× / 0.6
Wrecks · South China Sealong running	1	125.6	4	842	2.5× / 0.4
Wrecks · English Channellong running	1	85.3	3	365	1.7× / 0.6
Surveys · Sea of Okhotsk	1	77	2	85	2.5× / 0.4
Nav aids · Kara Sea	1	68.5	3	223	new / 0
Surveys · North Sea	1	67.7	0	—	1.7× / 0.6
Cable ops · Barentsz Sea	1	66	2	93	1.7× / 0.6
Nav aids · Celtic Sealong running	1	65.1	2	1,406	0.6× / 1.8
Wrecks · Irish Sea and St. George's Channellong running	1	64.5	2	439	new / 0
Restricted · South Atlantic Ocean	1	47.6	1	41	new / 0
Cable ops · Arabian Sea	1	45.5	1	90	2.5× / 0.4
Nav aids · Andaman or Burma Sea	1	40.7	0	—	5.0× / 0.2
Wrecks · Andaman or Burma Sea	1	36.5	2	335	new / 0
Nav aids · The Northwestern Passages	1	36	0	—	5.0× / 0.2
Nav aids · English Channel	1	32.7	1	77	0.5× / 2.2
Derelicts · South Pacific Oceanlong running	1	31.5	1	1,526	0.4× / 2.8
Nav aids · Arafura Sea	1	31.1	1	69	new / 0
Nav aids · Persian Gulf	1	28.6	1	28	new / 0
Cable ops · Philippine Sea	1	28.5	1	28	1.3× / 0.8
Incidents · Mediterranean Sea - Western Basin	1	27.6	0	—	0.7× / 1.4
Cable ops · Baffin Bay	1	27.2	1	27	new / 0
Spills · Bering Sea	1	27	1	44	new / 0
Nav aids · Gulf of Suez	1	24.7	0	—	new / 0
Cable ops · Black Sea	1	23.5	1	59	1.7× / 0.6
Exercises · Sea of Okhotsk	1	22	1	46	1.7× / 0.6
Cable ops · Adriatic Sea	1	15.1	0	—	new / 0
Exercises · Gulf of Mexico	1	14.5	0	—	0.7× / 1.4
Cable ops · Tasman Sea	1	13	1	12	2.5× / 0.4
Incidents · Mozambique Channel	1	12.9	1	31	0.5× / 2
Cable ops · Laptev Sea	1	12.5	1	12	new / 0
Other · Arabian Sea	1	12.4	1	12	1.7× / 0.6
Nav aids · Black Sea	1	11.1	0	—	5.0× / 0.2
Other · Labrador Sea	1	11	0	—	new / 0
Surveys · Arabian Sea	1	10	0	—	5.0× / 0.2
Other · North Pacific Ocean	1	6.8	0	—	2.5× / 0.4
Incidents · Tasman Sea	1	6.8	0	—	0.8× / 1.2
Exercises · Indian Ocean	1	6.2	0	—	0.6× / 1.6
Missiles · Kara Sea	1	6.2	0	—	5.0× / 0.2
Other · Irish Sea and St. George's Channel	1	5.6	0	—	new / 0
Missiles · Norwegian Sea	1	5.6	0	—	new / 0
Other · Bay of Biscay	1	5	1	4	5.0× / 0.2
Incidents · Solomon Sea	1	5	0	—	1.3× / 0.8
Derelicts · Arabian Sea	1	4.9	0	—	0.8× / 1.2
Cable ops · Gulf of Finland	1	4.6	1	4	new / 0
Missiles · Laccadive Sea	1	4.4	0	—	1.3× / 0.8
Piracy · North Atlantic Ocean	1	4.2	0	—	new / 0
Piracy · Mediterranean Sea - Eastern Basin	1	4	0	—	new / 0
Incidents · Malacca Strait	1	3.9	0	—	5.0× / 0.2
Piracy · Gulf of Guinea	1	3.8	0	—	1.7× / 0.6
Cable ops · East Siberian Sea	1	3.7	1	3	new / 0
Incidents · Celtic Sea	1	3.3	0	—	2.5× / 0.4
Derelicts · Bay of Biscay	1	3	0	—	new / 0
Quakes · Bering Sea	1	3	0	—	5.0× / 0.2
Quakes · Coral Sea	1	3	0	—	0.3× / 3
Containers · Great Australian Bight	1	3	0	—	new / 0
Quakes · Japan Sea	1	3	0	—	new / 0
Derelicts · Laccadive Sea	1	3	0	—	new / 0
Derelicts · Mozambique Channel	1	3	0	—	new / 0
Containers · North Atlantic Ocean	1	3	0	—	1.0× / 1
Debris · North Atlantic Ocean	1	3	0	—	1.7× / 0.6
Derelicts · North Pacific Ocean	1	3	0	—	0.3× / 3.2
Piracy · South China Sea	1	2.9	0	—	1.7× / 0.6
Debris · North Pacific Ocean	1	2.8	1	2	1.3× / 0.8
Structures · South Atlantic Ocean	1	2.5	0	—	5.0× / 0.2
Restricted · South China Sea	1	1.7	0	—	2.5× / 0.4
Exercises · Mediterranean Sea - Western Basin	1	1.6	0	—	new / 0
Nav aids · Beaufort Sea	1	1.5	0	—	1.7× / 0.6
Cable ops · Arctic Ocean	1	1.2	1	1	5.0× / 0.2
Cable ops · Strait of Gibraltar	1	1	0	—	5.0× / 0.2
Derelicts · South China Sea	1	0.9	0	—	0.7× / 1.4
Exercises · Sea of Azov	1	0.8	0	—	new / 0
Containers · South Atlantic Ocean	1	0.8	1	0	new / 0
Surveys · Black Sea	1	0.5	1	0	1.0× / 1
Cable ops · Indian Ocean	1	0.5	1	0	1.7× / 0.6
Derelicts · Bering Sea	1	0.4	0	—	new / 0
Incidents · Hudson Strait	1	0.4	0	—	5.0× / 0.2
Incidents · Arafura Sea	1	0.2	0	—	1.7× / 0.6
Incidents · Davis Strait	1	0.2	0	—	0.8× / 1.2
Incidents · Molukka Sea	1	0.2	0	—	new / 0
Incidents · Bass Strait	1	0.1	0	—	new / 0
Other · Gulf of Mexico	1	0	0	—	1.7× / 0.6
Incidents · North Sea	1	0	0	—	new / 0
Restricted · North Sealong running	0	310	10	1,623	0.0× / 1.2
Surveys · Beaufort Sealong running	0	279	9	2,212	0.0× / 0.2
Wrecks · Arabian Sealong running	0	186	6	1,066	0.0× / 1.2
Cable ops · Norwegian Sea	0	146.6	4	60	0.0× / 1.4
Surveys · Davis Strait	0	124	4	339	0.0× / 0.2
Nav aids · Sea of Okhotsklong running	0	124	4	1,716	0.0× / 0.4
Exercises · Ionian Sea	0	93	3	242	— / 0
Wrecks · Solomon Sealong running	0	93	3	540	0.0× / 0.2
Wrecks · Caribbean Sealong running	0	85.8	1	687	— / 0
Cable ops · Sea of Okhotsk	0	63	2	113	0.0× / 1
Nav aids · Arabian Sealong running	0	62	2	492	0.0× / 0.4
Nav aids · Bass Straitlong running	0	62	2	1,248	0.0× / 0.8
Surveys · Bering Sea	0	62	2	52	— / 0
Surveys · Caribbean Sea	0	62	2	306	0.0× / 0.2
Nav aids · Malacca Strait	0	62	2	310	— / 0

Cite: seahazards.com Sea Ledger, 2016-08, 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.