Sea Ledger, March 2017

2017-03-01 to 2017-03-31 · archive

issued: 703
warning-days in force: 12,473
in force at month end: 404
sea × type cells: 250

baseline: same month, previous 5 years (2016-03, 2015-03, 2014-03, 2013-03, 2012-03)

By type

type	issued	warning-days	in force at end
Incidents	144	1,199.4	41
Exercises	131	1,376.3	47
Surveys	90	2,154.9	72
Nav aids	74	3,546.2	110
Icebergs	71	88.1	3
Missiles	39	304.5	8
Derelicts	30	109.2	3
Cable ops	28	645.7	18
Quakes	24	71.3	4
Piracy	19	93.3	5
Other	17	568.9	19
Spills	10	197	3
Wrecks	7	1,518.7	51
Containers	6	13.6	2
Debris	5	15	0
Restricted	3	156.1	6
Ordnance	3	177.9	5
Volcanic	2	122	5
War risk	0	53.2	0
Structures	0	31	1
Storms	0	31	1

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Surveys · South Atlantic Oceansurge	41	317.1	9	296	6.0× / 6.8
Incidents · South China Seasurge	39	264.2	7	48	2.4× / 16.2
Icebergs · Southern Oceansurge	32	32.1	1	31	23× / 1.4
Icebergs · North Atlantic Oceansurge	27	34.1	2	30	2.3× / 12
Incidents · North Pacific Ocean	26	97.2	3	48	1.0× / 25.4
Exercises · North Pacific Ocean	24	150.7	4	63	1.3× / 18.2
Missiles · North Atlantic Oceansurge	19	87	3	29	3.5× / 5.4
Exercises · Black Seasurge	18	152.5	11	121	2.7× / 6.6
Incidents · Mediterranean Sea - Eastern Basin	17	317	12	41	1.9× / 9.2
Incidents · North Atlantic Ocean	14	131.1	6	48	0.9× / 14.8
Nav aids · North Sealong running	12	333.4	11	496	1.1× / 10.4
Surveys · Arabian Seasurge	12	170	6	45	6.7× / 1.8
Cable ops · Celtic Seasurge	11	44.1	1	30	11× / 1
Nav aids · South Atlantic Ocean	10	250.7	7	160	1.3× / 8
Exercises · Arabian Sea	10	70.9	1	63	1.2× / 8.4
Incidents · Indian Ocean	9	31.7	0	—	1.1× / 8.4
Exercises · Mediterranean Sea - Eastern Basin	9	24.3	0	—	1.8× / 5
Exercises · Bay of Bengal	8	66.7	3	35	0.7× / 11
Piracy · Gulf of Guineasurge	8	39	2	28	8.0× / 1
Exercises · South Pacific Ocean	8	29	0	—	1.8× / 4.4
Exercises · North Atlantic Ocean	7	101.8	3	64	1.4× / 5.2
Quakes · South Pacific Ocean	7	24	0	—	0.7× / 10
Icebergs · Labrador Sea	7	9.4	0	—	0.5× / 15.4
Surveys · North Atlantic Oceansurgelong running	6	257.1	9	1,032	6.0× / 1
Nav aids · South Pacific Oceansurge	6	218.8	7	217	7.5× / 0.8
Nav aids · Coral Sealong running	6	130.9	7	1,078	1.0× / 5.8
Exercises · Philippine Sea	6	78	2	35	1.5× / 4
Missiles · North Pacific Ocean	6	60.8	1	43	1.1× / 5.4
Exercises · Laccadive Seasurge	6	47.9	2	31	5.0× / 1.2
Exercises · South Atlantic Ocean	6	34.7	1	29	0.8× / 8
Exercises · Aegean Sea	5	352	11	92	1.8× / 2.8
Nav aids · Tasman Seasurge	5	100.2	3	304	6.3× / 0.8
Exercises · South China Sea	5	71.6	4	35	1.9× / 2.6
Nav aids · Inner Seas off the West Coast of Scotland	5	68.6	2	149	1.0× / 4.8
Incidents · South Atlantic Ocean	5	22.4	3	41	0.8× / 6.2
Cable ops · North Atlantic Ocean	4	104	2	40	0.9× / 4.2
Missiles · Black Seasurge	4	71.1	3	35	10× / 0.4
Incidents · Philippine Seasurge	4	63.5	1	45	2.2× / 1.8
Incidents · Caribbean Sea	4	45.9	2	48	0.8× / 4.8
Surveys · Caribbean Seasurge	4	35.3	3	78	20× / 0.2
Piracy · Indian Oceansurge	4	14.3	1	7	2.9× / 1.4
Incidents · Gulf of Mexico	4	13	1	35	1.7× / 2.4
Exercises · Baltic Sea	4	12.5	1	32	1.0× / 4
Derelicts · North Atlantic Ocean	4	9.6	0	—	0.8× / 4.8
Other · North Atlantic Oceansurge	4	2	2	13	2.0× / 2
Nav aids · Gulf of Mexicolong running	3	242.7	8	1,140	1.9× / 1.6
Surveys · Bay of Bengalsurge	3	130.6	4	266	3.8× / 0.8
Surveys · North Seasurge	3	62.1	2	44	3.0× / 1
Spills · Gulf of Mexico	3	51	1	45	0.6× / 5
Nav aids · Mediterranean Sea - Western Basin	3	50.4	1	44	1.3× / 2.4
Surveys · Black Seasurge	3	37.2	2	42	3.8× / 0.8
Nav aids · Arafura Seasurge	3	32.9	1	281	2.5× / 1.2
Nav aids · Andaman or Burma Seasurge	3	29.7	1	25	5.0× / 0.6
Missiles · Barentsz Sea	3	22.9	0	—	1.9× / 1.6
Surveys · Aegean Seasurge	3	16.9	0	—	5.0× / 0.6
Incidents · South Pacific Ocean	3	14.8	1	24	0.4× / 6.8
Nav aids · Celtic Seasurge	3	14	0	—	5.0× / 0.6
Derelicts · North Pacific Ocean	3	13.9	0	—	1.1× / 2.6
Missiles · Indian Oceansurge	3	11.5	0	—	2.1× / 1.4
Quakes · North Pacific Ocean	3	11.3	0	—	0.4× / 7.8
Piracy · Gulf of Adensurge	3	9.6	0	—	15× / 0.2
Derelicts · Indian Ocean	3	9	0	—	0.9× / 3.4
Icebergs · Indian Ocean	3	9	0	—	1.9× / 1.6
Debris · North Pacific Oceansurge	3	9	0	—	3.0× / 1
Derelicts · Tasman Seasurge	3	9	0	—	7.5× / 0.4
Incidents · Bismarck Seasurge	3	8.6	0	—	5.0× / 0.6
Derelicts · Bay of Bengalsurge	3	7.5	1	29	3.8× / 0.8
Nav aids · Gulf of Alaska	3	6	0	—	1.4× / 2.2
Exercises · Coral Sea	3	5.8	0	—	1.7× / 1.8
Derelicts · North Seanew	3	4.7	0	—	new / 0
Containers · Norwegian Seanew	3	4.6	2	5	new / 0
Nav aids · Strait of Gibraltarsurge	3	0.3	0	—	15× / 0.2
Incidents · Coral Sea	3	0.2	0	—	0.8× / 3.8
Wrecks · South China Sealong running	2	313.7	11	1,054	5.0× / 0.4
Other · South China Sealong running	2	96.3	3	856	3.3× / 0.6
Ordnance · North Sea	2	82.9	2	47	10× / 0.2
Wrecks · North Sea	2	79.2	3	44	10× / 0.2
Nav aids · English Channel	2	64.4	2	289	0.5× / 4
Surveys · Andaman or Burma Sea	2	60.9	1	101	5.0× / 0.4
Surveys · Mediterranean Sea - Eastern Basin	2	36.2	1	43	1.3× / 1.6
Cable ops · Arabian Sea	2	36.1	0	—	1.7× / 1.2
Spills · Bering Seanew	2	28	0	—	new / 0
Spills · North Pacific Ocean	2	28	0	—	1.7× / 1.2
Cable ops · South China Sea	2	22.4	0	—	1.3× / 1.6
Incidents · Davis Strait	2	20.3	0	—	2.5× / 0.8
Exercises · Yellow Sea	2	19.2	0	—	0.2× / 10
Surveys · South China Sea	2	17.1	2	16	10× / 0.2
Incidents · Adriatic Sea	2	15.9	0	—	3.3× / 0.6
Spills · North Atlantic Ocean	2	15	1	25	1.0× / 2
Surveys · Singapore Straitnew	2	13.8	1	13	new / 0
Exercises · Barentsz Sea	2	13.4	0	—	10× / 0.2
Cable ops · Irish Sea and St. George's Channelnew	2	12.2	0	—	new / 0
Surveys · South Pacific Oceannew	2	12.1	0	—	new / 0
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	2	10.4	0	—	2.5× / 0.8
Cable ops · Mediterranean Sea - Western Basin	2	9.5	0	—	10× / 0.2
Missiles · Philippine Sea	2	6.1	0	—	10× / 0.2
Derelicts · Caribbean Sea	2	6	0	—	1.4× / 1.4
Quakes · Indian Ocean	2	6	0	—	1.1× / 1.8
Quakes · Philippine Sea	2	6	0	—	1.3× / 1.6
Quakes · Solomon Sea	2	6	0	—	0.7× / 2.8
Derelicts · Laccadive Sea	2	5.5	1	16	3.3× / 0.6
Incidents · Bay of Bengal	2	4.6	0	—	1.4× / 1.4
Exercises · Indian Ocean	2	3.9	0	—	2.5× / 0.8
Exercises · Mediterranean Sea - Western Basinnew	2	3.4	0	—	new / 0
Wrecks · Caribbean Sea	1	349.5	11	258	new / 0
Nav aids · North Atlantic Oceanlong running	1	306.5	9	1,409	0.3× / 4
Other · Caribbean Sea	1	127	4	70	2.5× / 0.4
Exercises · Ionian Sea	1	94.9	3	89	5.0× / 0.2
Other · Coral Sealong running	1	93.1	3	716	2.5× / 0.4
Nav aids · Gulf of California	1	62	2	282	new / 0
Nav aids · Arabian Sea	1	61	2	84	1.3× / 0.8
Other · Gulf of Mexico	1	54.3	1	115	2.5× / 0.4
Cable ops · Philippine Sea	1	52.5	2	240	5.0× / 0.2
Surveys · Persian Gulflong running	1	47.2	2	382	1.0× / 1
Cable ops · South Atlantic Ocean	1	44.9	1	87	0.0× / 25.2
Volcanic · Philippine Sealong running	1	38.7	2	1,797	new / 0
Surveys · Indian Ocean	1	38.5	2	127	1.7× / 0.6
Incidents · Molukka Sea	1	31.6	1	34	new / 0
Nav aids · Great Australian Bightlong running	1	31.3	1	485	1.3× / 0.8
Derelicts · South China Sea	1	31.3	1	70	1.7× / 0.6
Nav aids · Bass Straitlong running	1	31	1	699	1.3× / 0.8
Restricted · Persian Gulf	1	31	1	56	new / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	31	0	—	0.8× / 1.2
Surveys · Bay of Biscay	1	21.3	1	21	new / 0
Volcanic · Gulf of Guinea	1	21.3	1	21	new / 0
Surveys · Tasman Sea	1	21.2	0	—	new / 0
Cable ops · North Pacific Ocean	1	20.9	1	20	5.0× / 0.2
Incidents · Arabian Sea	1	20.6	1	47	0.5× / 2
Wrecks · Persian Gulf	1	16.2	1	67	1.7× / 0.6
Incidents · Tyrrhenian Sea	1	16	0	—	2.5× / 0.4
Wrecks · Gulf of Mexico	1	15.1	1	15	new / 0
Other · Arabian Sea	1	14	0	—	5.0× / 0.2
Incidents · Malacca Strait	1	13.8	1	13	5.0× / 0.2
Other · Laccadive Sea	1	12.3	1	12	new / 0
Piracy · Sulu Sea	1	11.9	0	—	new / 0
Surveys · English Channel	1	11.5	0	—	new / 0
Cable ops · Japan Sea	1	8.6	1	8	new / 0
Incidents · Mediterranean Sea - Western Basin	1	8.4	1	8	1.3× / 0.8
Piracy · Celebes Sea	1	7.7	1	7	new / 0
Restricted · South China Sea	1	7.6	1	7	5.0× / 0.2
Piracy · Malacca Strait	1	7	0	—	5.0× / 0.2
Exercises · Gulf of Mexico	1	6.8	0	—	1.0× / 1
Missiles · Arctic Ocean	1	5.3	0	—	2.5× / 0.4
Other · South Pacific Ocean	1	5.1	0	—	2.5× / 0.4
Missiles · Laccadive Sea	1	4.9	0	—	1.3× / 0.8
Exercises · Gulf of Thailand	1	4.2	0	—	new / 0
Cable ops · Mediterranean Sea - Eastern Basin	1	4.2	1	4	0.6× / 1.6
Other · English Channel	1	4	0	—	0.7× / 1.4
Piracy · South China Sea	1	3.8	1	3	new / 0
Derelicts · Arafura Sea	1	3	0	—	5.0× / 0.2
Other · Arafura Sea	1	3	0	—	2.5× / 0.4
Quakes · Bali Sea	1	3	0	—	new / 0
Derelicts · Bass Strait	1	3	0	—	new / 0
Quakes · Bay of Bengal	1	3	0	—	new / 0
Debris · Coral Sea	1	3	0	—	1.7× / 0.6
Containers · English Channel	1	3	0	—	1.3× / 0.8
Derelicts · Great Australian Bight	1	3	0	—	new / 0
Icebergs · Greenland Sea	1	3	0	—	new / 0
Quakes · Gulf of Alaska	1	3	0	—	new / 0
Containers · North Atlantic Ocean	1	3	0	—	1.3× / 0.8
Debris · North Atlantic Ocean	1	3	0	—	1.3× / 0.8
Containers · North Sea	1	3	0	—	new / 0
Derelicts · Philippine Sea	1	3	0	—	5.0× / 0.2
Quakes · Southern Ocean	1	3	0	—	1.7× / 0.6
Quakes · Bering Sea	1	2.8	1	2	5.0× / 0.2
Quakes · Gulf of California	1	2.4	1	2	5.0× / 0.2
Ordnance · South China Sea	1	2	0	—	5.0× / 0.2
Other · Davis Strait	1	1.5	0	—	new / 0
Other · North Pacific Ocean	1	1.2	0	—	0.7× / 1.4
Exercises · Caribbean Sea	1	1.1	0	—	0.6× / 1.8
Restricted · South Atlantic Ocean	1	0.8	1	0	new / 0
Incidents · Tasman Sea	1	0.7	0	—	0.6× / 1.6
Derelicts · South Atlantic Ocean	1	0.6	0	—	0.7× / 1.4
Quakes · Gulf of Tomini	1	0.5	1	0	2.5× / 0.4
Icebergs · North Pacific Ocean	1	0.5	0	—	new / 0
Quakes · North Atlantic Ocean	1	0.3	1	0	5.0× / 0.2
Other · Bass Strait	1	0.1	0	—	new / 0
Derelicts · South Pacific Ocean	1	0.1	0	—	0.6× / 1.8
Incidents · Timor Sea	1	0.1	0	—	2.5× / 0.4
Nav aids · Caribbean Sealong running	0	708	21	1,145	0.0× / 1.2
Nav aids · North Pacific Ocean	0	263.8	8	215	0.0× / 2.2
Surveys · Arctic Oceanlong running	0	248	8	2,349	— / 0
Surveys · Beaufort Sealong running	0	217	7	2,424	— / 0
Wrecks · Arabian Sealong running	0	155	5	1,097	0.0× / 0.4
Wrecks · South Pacific Ocean	0	94	3	70	0.0× / 0.2
Surveys · Bering Sea	0	93	3	264	— / 0
Nav aids · Irish Sea and St. George's Channel	0	93	3	51	0.0× / 2.2
Cable ops · Persian Gulf	0	93	3	121	0.0× / 0.2
Surveys · Gulf of Mexico	0	73.8	2	53	0.0× / 0.4
Nav aids · Persian Gulf	0	64.6	2	240	— / 0
Ordnance · Black Sea	0	62	2	289	— / 0
Surveys · Davis Straitlong running	0	62	2	551	— / 0
Wrecks · Hudson Bay	0	62	2	101	— / 0
Nav aids · Kara Sealong running	0	62	2	435	— / 0
Nav aids · Malacca Straitlong running	0	62	2	522	— / 0
Other · Sea of Azov	0	62	2	245	— / 0
Nav aids · Sea of Okhotsklong running	0	62	2	1,928	0.0× / 0.2
Surveys · The Northwestern Passageslong running	0	62	2	1,698	— / 0
Wrecks · The Northwestern Passages	0	62	2	201	— / 0
Restricted · Black Sealong running	0	54.7	1	1,395	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2017-03, 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.