Sea Ledger, December 2019

2019-12-01 to 2019-12-31 · archive

issued: 701
warning-days in force: 11,517
in force at month end: 348
sea × type cells: 231

baseline: same month, previous 5 years (2018-12, 2017-12, 2016-12, 2015-12, 2014-12)

By type

type	issued	warning-days	in force at end
Exercises	179	1,618.3	29
Incidents	109	753.1	32
Icebergs	84	92.8	4
Surveys	76	2,507.5	82
Nav aids	54	2,276.9	72
Derelicts	38	251	8
Missiles	34	399.4	6
Quakes	28	89.1	0
Debris	24	106.6	3
Other	18	523.3	17
Cable ops	18	419	13
Wrecks	13	1,984.3	68
Spills	10	151.1	2
Piracy	7	39.2	3
Containers	4	6.5	0
Structures	3	99.7	3
Volcanic	2	57.5	2
Restricted	0	93	3
Ordnance	0	48.3	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Exercises · Mediterranean Sea - Eastern Basinsurgelong running	48	263.6	2	425	6.3× / 7.6
Icebergs · South Atlantic Ocean	32	31.3	1	30	1.4× / 22.2
Icebergs · Labrador Sea	31	36.9	2	32	1.1× / 27.4
Incidents · South China Sea	25	152.7	8	39	0.7× / 34.4
Exercises · Aegean Seasurgelong running	24	325.9	4	368	2.9× / 8.4
Exercises · North Pacific Ocean	23	171.1	5	35	1.6× / 14.4
Icebergs · Southern Oceansurge	19	18.2	1	29	2.1× / 9.2
Surveys · South Atlantic Ocean	17	528.3	20	152	1.9× / 9.2
Exercises · Black Seasurge	17	283.4	6	123	2.9× / 5.8
Exercises · Arabian Seasurge	14	109.8	1	34	2.2× / 6.4
Incidents · South Atlantic Ocean	14	38.3	2	38	1.9× / 7.2
Surveys · North Atlantic Oceansurgelong running	12	520.4	17	775	5.5× / 2.2
Incidents · North Pacific Ocean	12	133.9	4	41	0.6× / 20.4
Exercises · Bay of Bengal	10	129.5	0	—	1.0× / 10.4
Quakes · North Pacific Ocean	10	32.3	0	—	1.4× / 7.2
Nav aids · North Atlantic Ocean	9	181.3	5	143	1.4× / 6.2
Surveys · Indian Oceansurge	8	123	4	35	8.0× / 1
Incidents · South Pacific Ocean	8	99	4	41	1.5× / 5.2
Incidents · Arabian Seasurge	8	91.5	2	30	5.7× / 1.4
Missiles · Barentsz Seasurge	8	43.5	0	—	2.0× / 4
Derelicts · Arabian Seasurge	8	33.9	2	28	13× / 0.6
Derelicts · North Atlantic Oceansurge	8	20.7	2	22	2.0× / 4
Surveys · Persian Gulfsurge	7	353.1	10	217	5.8× / 1.2
Surveys · Arabian Sea	7	209.9	8	82	1.3× / 5.6
Nav aids · North Pacific Ocean	7	175.3	4	308	1.1× / 6.2
Incidents · North Atlantic Ocean	7	99.9	6	109	0.4× / 17.8
Cable ops · North Atlantic Oceansurge	7	87.7	4	61	5.0× / 1.4
Exercises · South Atlantic Ocean	7	43.1	1	34	0.8× / 9
Quakes · South Pacific Ocean	7	23.8	0	—	0.6× / 11.4
Debris · Celtic Seasurge	7	17.2	1	19	8.8× / 0.8
Surveys · Bay of Bengalsurge	6	62.5	3	55	3.8× / 1.6
Piracy · Gulf of Guineasurge	6	27.2	3	27	2.7× / 2.2
Missiles · Black Seasurge	5	139.1	2	33	2.8× / 1.8
Exercises · South Pacific Ocean	5	47.3	1	33	1.1× / 4.6
Debris · North Atlantic Ocean	5	44.4	1	33	1.4× / 3.6
Exercises · Yellow Sea	5	44	1	31	0.6× / 8.8
Derelicts · North Pacific Oceansurge	5	43.7	1	92	2.3× / 2.2
Exercises · South China Seasurge	5	21.6	0	—	2.3× / 2.2
Derelicts · Laccadive Seasurge	5	15.7	0	—	3.1× / 1.6
Incidents · Indian Ocean	5	10.3	1	25	1.5× / 3.4
Exercises · Philippine Sea	5	5.9	0	—	1.7× / 3
Incidents · Coral Sea	5	2.7	0	—	1.1× / 4.4
Wrecks · South China Seasurge	4	741.6	26	358	10× / 0.4
Nav aids · South Atlantic Ocean	4	271.1	6	196	0.6× / 6.6
Nav aids · South Pacific Oceansurgelong running	4	247.4	8	421	2.5× / 1.6
Nav aids · North Sea	4	76.6	3	64	0.4× / 10
Nav aids · Bass Straitsurge	4	70.4	5	279	2.0× / 2
Exercises · Ionian Seasurgelong running	4	67	5	368	3.3× / 1.2
Missiles · North Pacific Ocean	4	39.3	1	110	0.8× / 5
Missiles · South Pacific Ocean	4	28.1	0	—	1.1× / 3.6
Debris · South Atlantic Oceansurge	4	21.7	1	25	20× / 0.2
Debris · Arafura Seanew	4	12	0	—	new / 0
Quakes · Philippine Seasurge	4	12	0	—	4.0× / 1
Nav aids · Caribbean Sealong running	3	253.7	9	693	1.1× / 2.8
Spills · Gulf of Mexico	3	52	0	—	0.8× / 4
Spills · North Pacific Oceansurge	3	50	2	35	2.1× / 1.4
Derelicts · Indian Ocean	3	40.4	1	146	0.9× / 3.2
Surveys · Alboran Seanew	3	37.7	0	—	new / 0
Other · North Pacific Ocean	3	35.5	2	146	0.4× / 6.8
Exercises · Laccadive Seasurge	3	32.8	1	29	2.1× / 1.4
Missiles · North Atlantic Ocean	3	28.9	0	—	0.3× / 9.2
Incidents · Laccadive Sea	3	24.9	0	—	1.3× / 2.4
Wrecks · South Atlantic Oceansurge	3	14.7	2	28	7.5× / 0.4
Derelicts · Tyrrhenian Seanew	3	4.5	0	—	new / 0
Incidents · Bismarck Sea	3	3.6	0	—	1.9× / 1.6
Containers · Celtic Seasurge	3	3.5	0	—	7.5× / 0.4
Incidents · Tasman Sea	3	1.8	0	—	1.5× / 2
Surveys · Black Sea	2	68.9	1	104	1.3× / 1.6
Nav aids · Inner Seas off the West Coast of Scotland	2	50.3	2	47	0.5× / 3.8
Derelicts · South Pacific Ocean	2	47.5	1	61	0.8× / 2.6
Surveys · Mediterranean Sea - Western Basin	2	45.9	3	83	10× / 0.2
Nav aids · Persian Gulfnew	2	44.1	2	48	new / 0
Surveys · Timor Seanew	2	42.6	2	34	new / 0
Nav aids · Great Australian Bight	2	33.4	1	132	0.8× / 2.4
Surveys · Tasman Sea	2	32.9	2	27	10× / 0.2
Missiles · Aegean Sealong running	2	32.4	2	368	5.0× / 0.4
Missiles · Davis Strait	2	28.7	0	—	10× / 0.2
Spills · North Atlantic Ocean	2	28	0	—	1.1× / 1.8
Cable ops · Coral Seanew	2	26.9	1	34	new / 0
Volcanic · Philippine Seanew	2	26.5	1	26	new / 0
Cable ops · Mediterranean Sea - Western Basin	2	19.5	0	—	2.5× / 0.8
Incidents · Singapore Strait	2	17.1	1	26	3.3× / 0.6
Missiles · Indian Ocean	2	11.9	1	32	0.5× / 4.4
Other · North Atlantic Ocean	2	11.8	1	26	1.1× / 1.8
Other · Davis Strait	2	9.9	0	—	2.0× / 1
Exercises · Indian Ocean	2	9.4	0	—	0.8× / 2.4
Nav aids · Strait of Gibraltar	2	7.6	0	—	5.0× / 0.4
Incidents · Solomon Sea	2	7.3	0	—	3.3× / 0.6
Structures · Persian Gulfnew	2	6.3	0	—	new / 0
Derelicts · Bay of Bengal	2	6	0	—	1.4× / 1.4
Quakes · Coral Sea	2	6	0	—	3.3× / 0.6
Quakes · Indian Ocean	2	6	0	—	1.1× / 1.8
Nav aids · Gulf of Alaska	2	2.6	0	—	2.5× / 0.8
Surveys · Bass Strait	2	0.9	1	0	5.0× / 0.4
Other · Caribbean Sealong running	1	181.5	6	1,075	2.5× / 0.4
Nav aids · Arabian Sea	1	98.6	2	273	1.0× / 1
Surveys · Mediterranean Sea - Eastern Basin	1	81.9	2	133	0.2× / 4.2
Other · Arabian Sea	1	64	2	338	new / 0
Nav aids · Coral Sea	1	63.9	2	189	0.2× / 4.6
Nav aids · Indian Ocean	1	63.8	3	271	0.8× / 1.2
Wrecks · Persian Gulf	1	46.3	2	181	2.5× / 0.4
Other · South China Sealong running	1	40.8	1	557	1.7× / 0.6
Nav aids · English Channel	1	40.2	1	64	0.4× / 2.4
Surveys · South Pacific Ocean	1	39.3	1	90	2.5× / 0.4
Exercises · North Atlantic Ocean	1	36.3	1	123	0.1× / 7.2
Other · South Atlantic Ocean	1	31.7	1	38	new / 0
Wrecks · Great Australian Bight	1	31.6	1	204	new / 0
Surveys · Beaufort Sea	1	31	1	147	new / 0
Surveys · Gulf of Mexico	1	31	1	76	2.5× / 0.4
Nav aids · Norwegian Sea	1	26.7	1	26	5.0× / 0.2
Wrecks · English Channel	1	25.3	1	25	1.3× / 0.8
Cable ops · South Atlantic Ocean	1	22.4	1	22	0.1× / 6.8
Wrecks · Gulf of Thailand	1	20	0	—	5.0× / 0.2
Other · South Pacific Ocean	1	19.4	1	19	1.7× / 0.6
Surveys · Andaman or Burma Sea	1	18.9	0	—	1.7× / 0.6
Wrecks · Red Sea	1	17.6	1	17	new / 0
Incidents · Philippine Sea	1	15	0	—	0.2× / 4.8
Nav aids · Hudson Strait	1	14.8	1	14	new / 0
Incidents · Bay of Bengal	1	14.3	0	—	1.7× / 0.6
Cable ops · Caribbean Sea	1	14.1	0	—	1.7× / 0.6
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	2.5× / 0.4
Incidents · Arafura Sea	1	13.6	1	13	5.0× / 0.2
Surveys · Southern Ocean	1	13.4	0	—	new / 0
Piracy · Singapore Strait	1	12	0	—	5.0× / 0.2
Cable ops · Tasman Sea	1	10.2	0	—	0.6× / 1.6
Cable ops · Philippine Sea	1	8.4	1	8	2.5× / 0.4
Cable ops · Celtic Sea	1	8.2	0	—	5.0× / 0.2
Exercises · Red Sea	1	7.8	1	34	2.5× / 0.4
Cable ops · Eastern China Sea	1	7.5	1	7	1.0× / 1
Missiles · Arctic Ocean	1	7.2	0	—	1.7× / 0.6
Exercises · Sulu Sea	1	6.9	0	—	new / 0
Other · Gulf of Guinea	1	6.7	0	—	new / 0
Incidents · Ceram Sea	1	6.5	0	—	new / 0
Missiles · Laccadive Sea	1	6.1	0	—	1.0× / 1
Missiles · Southern Ocean	1	6	0	—	1.7× / 0.6
Exercises · Japan Sea	1	5	0	—	new / 0
Missiles · Mediterranean Sea - Eastern Basin	1	5	0	—	new / 0
Incidents · Black Sea	1	4.7	0	—	new / 0
Incidents · Mozambique Channel	1	4.3	1	4	1.0× / 1
Incidents · Mediterranean Sea - Eastern Basin	1	4.2	0	—	0.0× / 22.8
Exercises · Bay of Biscay	1	4.1	0	—	new / 0
Cable ops · English Channel	1	4	0	—	0.7× / 1.4
Icebergs · Laptev Sea	1	3.4	0	—	new / 0
Wrecks · Southern Ocean	1	3.3	1	3	5.0× / 0.2
Derelicts · Arafura Sea	1	3	0	—	new / 0
Debris · Bay of Biscay	1	3	0	—	new / 0
Quakes · Bismarck Sea	1	3	0	—	1.7× / 0.6
Debris · Coral Sea	1	3	0	—	5.0× / 0.2
Other · English Channel	1	3	0	—	2.5× / 0.4
Quakes · Gulf of Guinea	1	3	0	—	new / 0
Debris · Indian Ocean	1	3	0	—	new / 0
Icebergs · Kara Sea	1	3	0	—	new / 0
Derelicts · South Atlantic Ocean	1	3	0	—	0.3× / 3.2
Quakes · South Atlantic Ocean	1	3	0	—	0.6× / 1.6
Containers · South China Sea	1	3	0	—	1.7× / 0.6
Spills · Arabian Sea	1	2.1	0	—	new / 0
Exercises · Bering Sea	1	2.1	0	—	2.5× / 0.4
Incidents · Tyrrhenian Sea	1	2.1	0	—	new / 0
Nav aids · Celtic Sea	1	2	0	—	0.4× / 2.6
Debris · English Channel	1	2	0	—	1.0× / 1
Incidents · Celebes Sea	1	1.9	0	—	5.0× / 0.2
Incidents · Mediterranean Sea - Western Basin	1	1.9	1	1	5.0× / 0.2
Exercises · Coral Sea	1	1.7	0	—	1.7× / 0.6
Other · Tasman Sea	1	1.7	0	—	1.7× / 0.6
Incidents · Java Sea	1	1.5	1	1	0.4× / 2.6
Other · Celebes Sea	1	1	0	—	new / 0
Nav aids · Tasman Sea	1	1	0	—	5.0× / 0.2
Structures · South Atlantic Ocean	1	0.4	0	—	0.8× / 1.2
Incidents · Molukka Sea	1	0.1	0	—	2.5× / 0.4
Other · Great Australian Bight	1	0	0	—	new / 0
Other · Indian Ocean	1	0	0	—	5.0× / 0.2
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	1	0	0	—	0.6× / 1.8
Wrecks · Caribbean Sealong running	0	248	8	1,065	0.0× / 0.8
Wrecks · North Atlantic Oceanlong running	0	217	7	789	0.0× / 0.2
Nav aids · Mozambique Channel	0	124	4	299	— / 0
Wrecks · North Pacific Oceanlong running	0	124	4	928	— / 0
Wrecks · Arabian Sea	0	93	3	175	0.0× / 0.8
Nav aids · Philippine Sea	0	93	3	300	— / 0
Cable ops · North Pacific Ocean	0	83.6	1	77	0.0× / 0.8
Surveys · South China Sea	0	77	2	119	0.0× / 0.8
Wrecks · Gulf of Mexicolong running	0	62	2	1,020	— / 0
Wrecks · Laccadive Sea	0	62	2	119	0.0× / 0.4
Nav aids · Mediterranean Sea - Eastern Basin	0	62	2	181	0.0× / 0.2
Structures · South China Sealong running	0	62	2	596	— / 0
Ordnance · North Sea	0	48.3	1	78	0.0× / 0.8
Nav aids · Aegean Sea	0	36.5	1	273	— / 0
Cable ops · South Pacific Ocean	0	33.5	1	43	0.0× / 0.6
Cable ops · Aegean Sea	0	31	1	40	0.0× / 0.8
Nav aids · Andaman or Burma Sea	0	31	1	215	0.0× / 0.6
Nav aids · Arafura Sea	0	31	1	119	0.0× / 0.4
Surveys · Arctic Ocean	0	31	1	82	— / 0
Surveys · Bering Sea	0	31	1	114	— / 0
Other · Black Sea	0	31	1	63	— / 0
Restricted · Black Sea	0	31	1	141	0.0× / 0.2
Surveys · Caribbean Sea	0	31	1	53	0.0× / 0.2
Wrecks · Coral Sea	0	31	1	67	— / 0
Wrecks · Gulf of Californialong running	0	31	1	441	— / 0
Wrecks · Gulf of Guinea	0	31	1	90	— / 0
Nav aids · Gulf of Mexico	0	31	1	160	0.0× / 2.6
Nav aids · Gulf of Thailand	0	31	1	75	— / 0

Cite: seahazards.com Sea Ledger, 2019-12, 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.