Sea Ledger, December 2016

2016-12-01 to 2016-12-31 · archive

issued: 639
warning-days in force: 14,102
in force at month end: 412
sea × type cells: 239

baseline: same month, previous 5 years (2015-12, 2014-12, 2013-12, 2012-12, 2011-12)

By type

type	issued	warning-days	in force at end
Incidents	176	2,092.6	56
Exercises	85	1,258.9	25
Nav aids	77	3,860.5	124
Icebergs	67	82.3	3
Cable ops	50	931.4	32
Quakes	49	141	1
Derelicts	36	273.8	6
Surveys	28	1,835.7	57
Missiles	22	228.5	2
Other	20	806.6	25
Wrecks	7	1,319.3	46
Debris	7	18.2	1
Spills	6	158	1
Restricted	3	553	18
Containers	3	9	0
Piracy	2	131.1	2
Ordnance	1	122.9	4
War risk	0	62	2
Volcanic	0	62	2
Structures	0	124	4
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	43	375.1	11	53	2.1× / 20
Icebergs · South Atlantic Oceansurge	33	37	1	31	4.5× / 7.4
Icebergs · Labrador Sea	32	39.3	2	32	1.8× / 17.6
Incidents · Mediterranean Sea - Eastern Basinsurge	28	649.4	13	58	2.6× / 10.8
Incidents · North Pacific Ocean	28	218.3	6	54	1.2× / 24.2
Quakes · Solomon Seasurge	24	69.1	0	—	20× / 1.2
Incidents · North Atlantic Ocean	19	255.8	8	54	1.2× / 16.4
Nav aids · North Pacific Oceansurge	17	244.8	7	231	7.7× / 2.2
Exercises · North Atlantic Oceansurge	16	87.6	1	103	7.3× / 2.2
Exercises · Bay of Bengalsurge	14	97.1	3	33	2.0× / 7
Cable ops · South Atlantic Ocean	13	95.3	5	36	0.5× / 28.2
Nav aids · North Sealong running	12	283.1	10	406	0.7× / 17.2
Incidents · South Atlantic Oceansurge	11	56.6	1	34	2.3× / 4.8
Quakes · North Pacific Oceansurge	10	25.4	0	—	2.1× / 4.8
Exercises · Mediterranean Sea - Eastern Basinsurge	9	23.3	1	33	2.0× / 4.4
Quakes · South Pacific Ocean	8	24	0	—	0.9× / 9
Exercises · Black Seasurge	7	194	2	123	2.9× / 2.4
Exercises · North Pacific Ocean	7	110.9	3	38	0.4× / 16.6
Derelicts · Indian Oceansurge	7	72.4	0	—	3.9× / 1.8
Missiles · North Pacific Ocean	7	66	1	61	1.6× / 4.4
Derelicts · South Atlantic Oceansurge	7	13.4	0	—	7.0× / 1
Nav aids · South Atlantic Ocean	6	388.8	10	164	0.9× / 6.4
Exercises · Aegean Sealong running	6	354.4	10	369	1.5× / 4
Cable ops · South China Seasurge	6	95.4	2	102	2.7× / 2.2
Incidents · Indian Ocean	6	64.1	2	43	0.8× / 7.2
Cable ops · English Channelsurge	6	13.5	0	—	15× / 0.4
Nav aids · Caribbean Seasurgelong running	5	549.1	20	1,055	4.2× / 1.2
Nav aids · North Atlantic Oceanlong running	5	267.1	9	1,319	0.6× / 8.2
Surveys · South Atlantic Ocean	5	185.9	5	213	1.1× / 4.4
Cable ops · Tasman Seasurge	5	81.1	3	73	25× / 0.2
Surveys · Mediterranean Sea - Eastern Basinsurge	5	80.7	1	67	3.6× / 1.4
Surveys · Arabian Seasurge	5	57.7	2	61	2.5× / 2
Exercises · South Pacific Oceansurge	5	32.4	0	—	4.2× / 1.2
Derelicts · South China Sea	5	13.5	1	30	1.3× / 4
Incidents · Tasman Seasurge	5	6.7	2	6	6.3× / 0.8
Incidents · Coral Sea	5	3.4	0	—	1.0× / 5.2
Nav aids · Coral Sealong running	4	180.1	6	988	1.8× / 2.2
Incidents · Caribbean Sea	4	119.4	3	87	0.7× / 6
Cable ops · North Atlantic Ocean	4	81.5	3	114	1.1× / 3.8
Exercises · South Atlantic Ocean	4	48.6	0	—	0.4× / 9.4
Incidents · Philippine Sea	4	45.1	2	55	0.9× / 4.6
Derelicts · North Atlantic Ocean	4	39.1	1	21	1.1× / 3.6
Derelicts · Caribbean Seasurge	4	20.1	0	—	3.3× / 1.2
Incidents · North Seanew	4	2.8	0	—	new / 0
Nav aids · Gulf of Mexicolong running	3	249.8	8	1,050	1.3× / 2.4
Exercises · Philippine Sea	3	76.2	0	—	1.9× / 1.6
Nav aids · Andaman or Burma Seanew	3	64.1	3	95	new / 0
Nav aids · Inner Seas off the West Coast of Scotland	3	57	3	59	0.5× / 5.6
Incidents · Gulf of Mexicosurge	3	56.8	2	48	3.0× / 1
Incidents · South Pacific Ocean	3	49.5	0	—	0.4× / 6.8
Nav aids · Celtic Sealong running	3	38.6	1	1,528	1.3× / 2.4
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	3	28.9	0	—	1.9× / 1.6
Exercises · Arabian Sea	3	18.4	0	—	0.4× / 7.2
Missiles · North Atlantic Ocean	3	16.5	0	—	0.4× / 8.2
Missiles · Indian Ocean	3	15.7	0	—	1.3× / 2.4
Missiles · Arabian Seasurge	3	9.1	0	—	5.0× / 0.6
Nav aids · South Pacific Ocean	2	217.7	7	127	2.0× / 1
Nav aids · Bay of Bengallong running	2	137.4	5	445	10× / 0.2
Other · South China Sealong running	2	126.2	4	766	2.5× / 0.8
Surveys · Bay of Bengal	2	113	5	176	5.0× / 0.4
Derelicts · South Pacific Oceanlong running	2	72.1	1	1,648	1.3× / 1.6
Other · Davis Straitnew	2	69.9	0	—	new / 0
Cable ops · Persian Gulf	2	65.7	3	31	5.0× / 0.4
Exercises · South China Sea	2	65.5	1	35	0.8× / 2.4
Other · North Atlantic Oceanlong running	2	62.3	3	1,146	1.4× / 1.4
Surveys · Black Sea	2	59.6	2	47	2.0× / 1
Other · Gulf of Mexico	2	43.2	1	44	2.5× / 0.8
Spills · North Pacific Ocean	2	41	0	—	2.0× / 1
Cable ops · Caribbean Sea	2	37.3	1	82	2.5× / 0.8
Exercises · Laccadive Sea	2	32.4	1	32	2.0× / 1
Other · South Pacific Ocean	2	25.7	0	—	5.0× / 0.4
Incidents · Laccadive Sea	2	23.2	1	24	2.5× / 0.8
Wrecks · Hudson Baynew	2	22.2	2	11	new / 0
Cable ops · Strait of Gibraltarnew	2	21	0	—	new / 0
Derelicts · Laccadive Sea	2	18.1	2	48	10× / 0.2
Other · Caribbean Sea	2	14.7	0	—	3.3× / 0.6
Exercises · Yellow Sea	2	11.9	0	—	0.2× / 11.8
Derelicts · North Pacific Ocean	2	11	1	7	1.3× / 1.6
Missiles · South Pacific Ocean	2	10.6	0	—	1.4× / 1.4
Surveys · North Sea	2	9.8	0	—	10× / 0.2
Missiles · Barentsz Sea	2	8.7	0	—	0.6× / 3.6
Quakes · Banda Sea	2	8.1	0	—	1.4× / 1.4
Containers · North Atlantic Ocean	2	6	0	—	2.0× / 1
Debris · North Pacific Ocean	2	6	0	—	5.0× / 0.4
Debris · Timor Sea	2	6	0	—	3.3× / 0.6
Cable ops · Barentsz Seanew	2	3.3	0	—	new / 0
Debris · North Atlantic Ocean	2	3.2	1	23	3.3× / 0.6
Exercises · Mediterranean Sea - Western Basinnew	2	2.9	0	—	new / 0
Incidents · Gulf of Thailand	2	2.3	1	30	3.3× / 0.6
Other · Tasman Sea	2	1.6	1	17	10× / 0.2
Wrecks · South China Sealong running	1	236	8	964	new / 0
Nav aids · Indian Oceanlong running	1	125.5	4	1,046	0.7× / 1.4
Surveys · Indian Ocean	1	117	4	361	1.0× / 1
Restricted · Black Sealong running	1	99.5	4	1,305	new / 0
Cable ops · Gulf of Mexico	1	93	3	79	0.5× / 2
Wrecks · The Northwestern Passageslong running	1	92.3	3	480	new / 0
Piracy · Sulu Sea	1	86.3	2	41	new / 0
Cable ops · Arabian Sea	1	78.5	3	212	1.0× / 1
Wrecks · Caribbean Sea	1	65.2	3	168	2.5× / 0.4
Nav aids · Great Australian Bightlong running	1	63.1	2	668	0.6× / 1.8
Surveys · Caribbean Sealong running	1	62.6	2	428	new / 0
Nav aids · Bass Straitlong running	1	62.2	2	1,370	5.0× / 0.2
Other · Sea of Azov	1	60.9	2	273	new / 0
Other · Coral Sealong running	1	56.6	2	626	1.3× / 0.8
Cable ops · Eastern China Sea	1	45.2	2	38	1.0× / 1
Wrecks · South Atlantic Ocean	1	38.1	2	153	1.7× / 0.6
Cable ops · Bay of Bengal	1	34.5	2	154	0.8× / 1.2
Nav aids · English Channel	1	34.5	1	199	0.5× / 2.2
Nav aids · Irish Sea and St. George's Channel	1	31.5	1	36	0.3× / 3
Surveys · South Pacific Ocean	1	31.2	0	—	new / 0
Nav aids · Arafura Sea	1	31.1	1	191	5.0× / 0.2
Spills · Gulf of Mexico	1	31	0	—	0.4× / 2.6
Ordnance · Sea of Azov	1	29.9	1	138	2.5× / 0.4
Other · Bay of Bengal	1	29.6	1	29	5.0× / 0.2
Wrecks · Gulf of Thailand	1	28.5	1	28	new / 0
Surveys · Sea of Okhotsk	1	26.6	1	26	new / 0
Other · English Channel	1	24.7	1	32	5.0× / 0.2
Incidents · Eastern China Sea	1	24.4	0	—	5.0× / 0.2
Incidents · Davis Strait	1	21.4	1	57	1.0× / 1
Piracy · Gulf of Guinea	1	21	0	—	2.5× / 0.4
Nav aids · Norwegian Sea	1	20.1	1	20	new / 0
Cable ops · Gulf of Guinea	1	19.5	1	19	0.5× / 2
Incidents · Arabian Sea	1	18	0	—	0.7× / 1.4
Spills · North Atlantic Ocean	1	17	0	—	0.7× / 1.4
Surveys · Andaman or Burma Sea	1	15.3	1	72	1.7× / 0.6
Incidents · Andaman or Burma Sea	1	15.2	0	—	1.3× / 0.8
Cable ops · Banda Sea	1	15	0	—	5.0× / 0.2
Incidents · Bay of Bengal	1	14.3	1	14	0.7× / 1.4
Spills · Bering Sea	1	14	0	—	0.8× / 1.2
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	new / 0
Cable ops · Indian Ocean	1	13.9	0	—	0.6× / 1.8
Restricted · Irish Sea and St. George's Channel	1	13.8	0	—	new / 0
Incidents · Ionian Sea	1	12.1	1	12	1.3× / 0.8
Other · North Pacific Ocean	1	11.5	1	11	2.5× / 0.4
Nav aids · Black Sea	1	11.2	0	—	new / 0
Restricted · South Atlantic Ocean	1	5.7	0	—	new / 0
Cable ops · Flores Sea	1	4.7	0	—	2.5× / 0.4
Missiles · Greenland Sea	1	4.7	0	—	new / 0
Exercises · Baltic Sea	1	4.3	0	—	0.7× / 1.4
Nav aids · Gulf of Alaska	1	4	0	—	0.7× / 1.4
Exercises · Gulf of Mexico	1	3.4	0	—	0.7× / 1.4
Quakes · Indian Ocean	1	3.3	0	—	0.6× / 1.8
Missiles · Laccadive Sea	1	3.2	0	—	0.6× / 1.6
Incidents · Singapore Strait	1	3.1	1	3	5.0× / 0.2
Debris · Bay of Bengal	1	3	0	—	5.0× / 0.2
Quakes · Caribbean Sea	1	3	0	—	2.5× / 0.4
Incidents · Gulf of Aden	1	3	0	—	new / 0
Icebergs · Indian Ocean	1	3	0	—	new / 0
Quakes · Malacca Strait	1	3	0	—	new / 0
Derelicts · Mediterranean Sea - Eastern Basin	1	3	0	—	1.3× / 0.8
Icebergs · North Atlantic Ocean	1	3	0	—	5.0× / 0.2
Containers · North Pacific Ocean	1	3	0	—	1.0× / 1
Quakes · Philippine Sea	1	3	0	—	1.0× / 1
Derelicts · Mediterranean Sea - Western Basin	1	2.3	0	—	5.0× / 0.2
Quakes · Savu Sea	1	2.1	1	2	new / 0
Surveys · Tasman Sea	1	1.8	0	—	new / 0
Derelicts · Solomon Sea	1	1.2	0	—	new / 0
Surveys · Celtic Sea	1	1.1	0	—	new / 0
Exercises · Bering Sea	1	1	0	—	5.0× / 0.2
Incidents · Bismarck Sea	1	0.4	0	—	1.0× / 1
Other · Arafura Sea	1	0.3	0	—	new / 0
Restricted · North Sealong running	0	310	10	1,745	0.0× / 0.2
Surveys · Arctic Oceanlong running	0	248	8	2,259	— / 0
Wrecks · Arabian Sealong running	0	217	7	1,188	0.0× / 0.8
Surveys · Beaufort Sealong running	0	217	7	2,334	— / 0
Surveys · North Atlantic Oceanlong running	0	157	5	942	0.0× / 2.6
Surveys · Davis Straitlong running	0	124	4	461	— / 0
Nav aids · Sea of Okhotsklong running	0	124	4	1,838	0.0× / 0.4
Nav aids · Arabian Sealong running	0	93	3	614	0.0× / 1
Surveys · Bering Sea	0	93	3	174	— / 0
Wrecks · English Channellong running	0	93	3	487	0.0× / 0.4
Exercises · Ionian Sea	0	93	3	364	0.0× / 0.4
Wrecks · Irish Sea and St. George's Channellong running	0	93	3	561	0.0× / 0.2
Structures · Persian Gulf	0	93	3	163	— / 0
Wrecks · Solomon Sealong running	0	93	3	662	— / 0
Nav aids · Laccadive Sealong running	0	84.4	2	382	0.0× / 0.8
Missiles · Black Sea	0	63	0	—	0.0× / 1
Wrecks · Andaman or Burma Sealong running	0	62	2	457	— / 0
Other · Arabian Sea	0	62	2	134	— / 0
Ordnance · Black Sea	0	62	2	199	0.0× / 0.4
Wrecks · Celtic Sealong running	0	62	2	488	— / 0
Nav aids · Gulf of California	0	62	2	192	— / 0
Nav aids · Kara Sea	0	62	2	345	0.0× / 0.4
Nav aids · Malacca Straitlong running	0	62	2	432	0.0× / 0.2
War risk · Mediterranean Sea - Eastern Basinlong running	0	62	2	2,047	— / 0
Surveys · Persian Gulf	0	62	2	292	0.0× / 0.2
Other · South Atlantic Oceanlong running	0	62	2	1,153	0.0× / 0.2
Nav aids · Tasman Sea	0	62	2	214	0.0× / 0.4
Surveys · The Northwestern Passageslong running	0	62	2	1,608	— / 0
Surveys · South China Sea	0	45.4	1	225	0.0× / 0.2
Nav aids · Mozambique Channellong running	0	39.4	1	599	— / 0
Missiles · Aegean Sealong running	0	31	1	365	0.0× / 0.2
Restricted · Baltic Sea	0	31	1	107	— / 0
Other · Beaufort Sea	0	31	1	88	— / 0
Cable ops · Black Sea	0	31	1	130	0.0× / 1.4
Other · Black Sea	0	31	1	363	0.0× / 0.4
Wrecks · Black Sea	0	31	1	79	— / 0
Spills · Caribbean Sea	0	31	1	323	— / 0
Storms · Caribbean Sea	0	31	1	75	— / 0
Volcanic · Caribbean Sealong running	0	31	1	527	— / 0

Cite: seahazards.com Sea Ledger, 2016-12, 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.