Sea Ledger, March 2018

2018-03-01 to 2018-03-31 · archive

issued: 708
warning-days in force: 14,846
in force at month end: 449
sea × type cells: 244

baseline: same month, previous 5 years (2017-03, 2016-03, 2015-03, 2014-03, 2013-03)

By type

type	issued	warning-days	in force at end
Incidents	179	1,856.1	49
Exercises	100	1,243.1	34
Nav aids	94	4,355.9	124
Icebergs	88	93.4	4
Surveys	53	2,343.4	79
Missiles	40	281.7	8
Other	33	596.5	16
Quakes	24	79.7	3
Derelicts	18	139.7	4
Spills	15	192	9
Wrecks	14	2,467.1	82
Cable ops	13	445.5	11
Debris	12	34.4	2
Restricted	7	165.3	5
Piracy	7	57.5	2
Containers	6	17.2	1
Volcanic	2	173.2	6
Ordnance	2	186	6
Structures	1	56.5	2
Storms	0	62	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Southern Oceansurge	34	32.9	1	30	4.7× / 7.2
Incidents · South China Sea	33	272.9	5	222	1.5× / 22.2
Incidents · Mediterranean Sea - Eastern Basinsurge	29	384.2	7	107	2.4× / 12.2
Incidents · North Pacific Ocean	24	311.1	9	218	0.9× / 26
Icebergs · South Atlantic Oceansurge	23	21.9	1	31	5.8× / 4
Nav aids · North Sea	21	275.3	7	269	1.9× / 11
Exercises · North Pacific Ocean	20	130.6	7	38	1.0× / 20.4
Icebergs · North Atlantic Ocean	17	20.1	2	31	1.0× / 17
Incidents · North Atlantic Ocean	14	171	6	48	0.9× / 15.8
Surveys · South Atlantic Ocean	13	216.8	9	70	1.0× / 13.2
Incidents · South Pacific Oceansurge	13	60.6	3	28	2.3× / 5.6
Icebergs · Labrador Sea	13	15.5	0	—	1.0× / 12.8
Exercises · Bay of Bengal	12	114.3	5	64	1.2× / 10
Exercises · South Atlantic Ocean	11	60.4	0	—	1.6× / 6.8
Nav aids · Coral Seasurgelong running	10	225.8	6	721	2.0× / 5
Missiles · North Atlantic Ocean	10	28.1	2	33	1.1× / 8.8
Exercises · Philippine Seasurge	10	10.8	0	—	2.6× / 3.8
Nav aids · South Atlantic Ocean	9	610.5	13	208	1.1× / 8.6
Other · English Channelsurge	9	74.7	2	87	5.6× / 1.6
Missiles · North Pacific Ocean	9	73.9	2	211	1.6× / 5.8
Surveys · Mediterranean Sea - Eastern Basinsurge	8	148.8	3	92	4.4× / 1.8
Incidents · Caribbean Sea	8	123.9	3	49	1.7× / 4.8
Incidents · Arabian Seasurge	8	123.6	2	48	4.0× / 2
Spills · North Atlantic Oceansurge	8	120	3	39	3.3× / 2.4
Missiles · Barentsz Seasurge	8	28	2	9	4.0× / 2
Exercises · South Pacific Ocean	8	25.2	1	24	1.6× / 5
Other · South Pacific Oceansurge	8	18.6	0	—	20× / 0.4
Quakes · Solomon Seasurge	8	15.6	3	33	2.5× / 3.2
Surveys · Arabian Sea	7	207	8	59	1.8× / 4
Exercises · Mediterranean Sea - Eastern Basin	7	67.9	1	39	1.1× / 6.4
Incidents · Indian Ocean	7	29.6	2	17	0.8× / 9
Nav aids · North Pacific Oceansurge	6	255.7	9	154	4.3× / 1.4
Incidents · Philippine Seasurge	6	86.3	3	47	2.3× / 2.6
Incidents · South Atlantic Ocean	6	65.7	1	36	1.1× / 5.2
Piracy · Gulf of Guineasurge	6	55.9	1	37	2.5× / 2.4
Missiles · Japan Seanew	6	41.8	1	38	new / 0
Incidents · Coral Sea	6	18.2	1	32	1.6× / 3.8
Exercises · North Atlantic Ocean	5	93.8	2	94	0.9× / 5.8
Exercises · Arabian Sea	5	58.1	2	33	0.6× / 9
Derelicts · South Atlantic Oceansurge	5	39.1	0	—	8.3× / 0.6
Other · North Seasurge	5	20.4	0	—	6.3× / 0.8
Nav aids · Caribbean Seasurge	4	621.9	21	312	3.3× / 1.2
Nav aids · Gulf of Mexicolong running	4	248.4	8	421	1.8× / 2.2
Exercises · Black Sea	4	170.9	1	32	0.5× / 8.6
Nav aids · Inner Seas off the West Coast of Scotland	4	102.5	3	194	0.8× / 5.2
Spills · Gulf of Mexico	4	37	4	45	0.8× / 5
Exercises · Japan Seanew	4	15.8	0	—	new / 0
Quakes · South Pacific Ocean	4	13.2	0	—	0.4× / 9.6
Surveys · Ionian Seanew	4	8.3	0	—	new / 0
Wrecks · Caribbean Seasurgelong running	3	593.3	20	439	15× / 0.2
Nav aids · North Atlantic Oceanlong running	3	316.8	7	400	1.0× / 3
Surveys · North Atlantic Oceanlong running	3	296.6	11	772	1.5× / 2
Nav aids · South Pacific Oceanlong running	3	273.1	7	572	1.5× / 2
Nav aids · Bay of Bengalsurge	3	133.5	5	351	5.0× / 0.6
Wrecks · English Channelsurge	3	93	3	72	15× / 0.2
Nav aids · Mediterranean Sea - Western Basin	3	73.9	2	45	1.3× / 2.4
Nav aids · Laccadive Seanew	3	67.2	3	179	new / 0
Surveys · Gulf of Mexicosurge	3	45.2	1	54	7.5× / 0.4
Other · North Pacific Oceansurge	3	29	0	—	2.1× / 1.4
Incidents · Eastern China Seasurge	3	28.3	1	44	15× / 0.2
Quakes · Banda Seasurge	3	21.6	0	—	15× / 0.2
Incidents · Java Seasurge	3	19.4	0	—	5.0× / 0.6
Nav aids · Celtic Seasurge	3	17.6	0	—	3.0× / 1
Exercises · Yellow Sea	3	14.2	0	—	0.3× / 9.6
Debris · Indian Oceansurge	3	9.7	0	—	3.8× / 0.8
Derelicts · Arabian Seasurge	3	9	0	—	5.0× / 0.6
Quakes · South Atlantic Oceansurge	3	9	0	—	2.5× / 1.2
Containers · Coral Seanew	3	8.3	0	—	new / 0
Derelicts · North Atlantic Ocean	3	6.1	0	—	0.7× / 4.4
Restricted · Mediterranean Sea - Eastern Basinnew	3	5.8	0	—	new / 0
Incidents · English Channelsurge	3	0.8	0	—	15× / 0.2
Exercises · Aegean Sea	2	313.2	10	94	0.6× / 3.6
Wrecks · North Sealong running	2	188.3	7	367	3.3× / 0.6
Nav aids · Arabian Sea	2	134.3	4	338	2.5× / 0.8
Surveys · Indian Oceanlong running	2	114.2	4	492	2.5× / 0.8
Nav aids · Indian Ocean	2	107.9	3	224	1.7× / 1.2
Cable ops · North Atlantic Ocean	2	103.7	2	69	0.6× / 3.4
Surveys · Bay of Bengallong running	2	96.1	2	631	1.4× / 1.4
Ordnance · North Sea	2	93	3	56	5.0× / 0.4
Nav aids · English Channel	2	60.3	1	61	0.6× / 3.6
Cable ops · Black Sea	2	57.5	2	79	10× / 0.2
Other · South China Sealong running	2	50.7	3	1,221	2.0× / 1
Volcanic · Caribbean Seanew	2	49.2	2	335	new / 0
Cable ops · Philippine Sea	2	43.5	0	—	5.0× / 0.4
Wrecks · South Atlantic Ocean	2	40	2	175	5.0× / 0.4
Derelicts · South Pacific Ocean	2	32.6	3	31	1.1× / 1.8
Wrecks · Inner Seas off the West Coast of Scotlandnew	2	31	1	70	new / 0
Incidents · Arafura Seanew	2	24.9	1	16	new / 0
Incidents · Banda Seanew	2	19.5	0	—	new / 0
Surveys · South Pacific Ocean	2	18.2	1	18	5.0× / 0.4
Nav aids · Bristol Channel	2	12.6	0	—	2.5× / 0.8
Spills · North Pacific Ocean	2	10	2	43	1.4× / 1.4
Restricted · South Atlantic Ocean	2	9.5	0	—	10× / 0.2
Missiles · Arabian Sea	2	8.5	0	—	2.0× / 1
Quakes · Indian Ocean	2	6	0	—	1.1× / 1.8
Derelicts · North Pacific Ocean	2	6	0	—	0.8× / 2.6
Quakes · North Pacific Ocean	2	6	0	—	0.3× / 6
Missiles · Laccadive Sea	2	5.8	0	—	2.0× / 1
Incidents · Malacca Strait	2	5.2	2	2	5.0× / 0.4
Debris · South Pacific Ocean	2	5.1	1	8	5.0× / 0.4
Incidents · Molukka Sea	2	5	1	11	10× / 0.2
Debris · North Pacific Ocean	2	4.6	1	22	1.3× / 1.6
Debris · English Channelnew	2	3.2	0	—	new / 0
Nav aids · Irish Sea and St. George's Channel	2	1.6	0	—	1.1× / 1.8
Wrecks · South China Sealong running	1	490	16	1,419	1.3× / 0.8
Wrecks · South Pacific Ocean	1	155	5	187	new / 0
Nav aids · Tasman Sealong running	1	93	3	396	0.6× / 1.6
Nav aids · South China Sea	1	75.6	3	136	new / 0
Restricted · Black Sealong running	1	72.9	2	1,760	5.0× / 0.2
Surveys · Black Sea	1	66.5	2	109	1.0× / 1
Cable ops · South Atlantic Ocean	1	62	2	60	0.1× / 18.4
Surveys · South China Sea	1	62	2	96	1.7× / 0.6
Incidents · Gulf of Mexico	1	54.4	0	—	0.4× / 2.8
Surveys · Andaman or Burma Sea	1	52.9	2	73	1.7× / 0.6
Surveys · Persian Gulf	1	40.2	2	100	1.0× / 1
Surveys · Caribbean Sealong running	1	36.4	2	443	1.0× / 1
Missiles · Aegean Sea	1	35.8	1	94	new / 0
Exercises · Laccadive Sea	1	32.9	1	33	0.5× / 2.2
Nav aids · Mozambique Channel	1	32.3	1	148	new / 0
Other · Indian Ocean	1	31.1	1	337	1.3× / 0.8
Cable ops · Java Sea	1	31	1	55	new / 0
Nav aids · Alboran Sea	1	30.4	1	30	5.0× / 0.2
Incidents · Gulf of Thailand	1	30.2	0	—	5.0× / 0.2
Cable ops · Bay of Bengal	1	28	0	—	0.4× / 2.8
Cable ops · Sea of Marmara	1	26.6	1	26	new / 0
Structures · Arabian Sea	1	25.5	1	25	new / 0
Other · Inner Seas off the West Coast of Scotland	1	18.3	1	18	5.0× / 0.2
Other · Gulf of Thailand	1	17.6	1	17	new / 0
Surveys · Timor Sea	1	16.6	1	16	new / 0
Restricted · North Pacific Ocean	1	15.1	1	15	new / 0
Nav aids · Sea of Okhotsk	1	15.1	1	15	5.0× / 0.2
Other · Japan Sea	1	14.7	0	—	new / 0
Other · Mediterranean Sea - Eastern Basin	1	14.6	0	—	1.0× / 1
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	1.0× / 1
Cable ops · Indian Ocean	1	12	1	11	1.3× / 0.8
Other · Arabian Sea	1	11	0	—	2.5× / 0.4
Exercises · Gulf of Guinea	1	11	0	—	new / 0
Cable ops · Aegean Sea	1	10.7	0	—	new / 0
Missiles · Arctic Ocean	1	10.6	0	—	1.7× / 0.6
Surveys · Philippine Sea	1	10.5	0	—	new / 0
Exercises · South China Sea	1	8.7	0	—	0.3× / 3
Incidents · Gulf of Guinea	1	8.6	1	8	new / 0
Cable ops · South Pacific Ocean	1	8.5	0	—	new / 0
Exercises · Coral Sea	1	6	0	—	0.5× / 2
Debris · Celtic Sea	1	5.8	0	—	new / 0
Exercises · Celebes Sea	1	5.5	0	—	new / 0
Surveys · North Sea	1	5.5	0	—	0.7× / 1.4
Exercises · Baltic Sea	1	5.1	0	—	0.2× / 4.2
Surveys · Barentsz Sea	1	4.7	1	4	5.0× / 0.2
Quakes · Ceram Sea	1	3.6	0	—	new / 0
Exercises · Indian Ocean	1	3.6	1	3	0.8× / 1.2
Nav aids · Timor Sea	1	3.6	0	—	5.0× / 0.2
Missiles · Black Sea	1	3.1	0	—	0.8× / 1.2
Containers · Black Sea	1	3	0	—	new / 0
Debris · Caribbean Sea	1	3	0	—	5.0× / 0.2
Derelicts · Caribbean Sea	1	3	0	—	0.7× / 1.4
Derelicts · Coral Sea	1	3	0	—	5.0× / 0.2
Icebergs · Kara Sea	1	3	0	—	new / 0
Derelicts · Laccadive Sea	1	3	0	—	1.3× / 0.8
Debris · North Atlantic Ocean	1	3	0	—	1.0× / 1
Quakes · North Atlantic Ocean	1	3	0	—	2.5× / 0.4
Containers · Tasman Sea	1	3	0	—	new / 0
Containers · North Atlantic Ocean	1	2.9	1	2	1.0× / 1
Nav aids · Arafura Sea	1	1.6	0	—	0.8× / 1.2
Exercises · Caribbean Sea	1	1.1	0	—	0.6× / 1.8
Exercises · Persian Gulf	1	1	0	—	1.7× / 0.6
Nav aids · Strait of Gibraltar	1	1	0	—	1.3× / 0.8
Piracy · Arabian Sea	1	0.7	1	0	2.5× / 0.4
Incidents · Tasman Sea	1	0.5	0	—	0.8× / 1.2
Incidents · Bali Sea	1	0.3	0	—	new / 0
Incidents · Bismarck Sea	1	0.3	0	—	1.0× / 1
Incidents · Adriatic Sea	1	0.2	1	0	1.0× / 1
Incidents · Gulf of Boni	1	0.2	0	—	new / 0
Surveys · Arctic Oceanlong running	0	186	6	1,348	— / 0
Surveys · Beaufort Sealong running	0	155	5	2,009	— / 0
Surveys · The Northwestern Passageslong running	0	155	5	2,063	— / 0
Other · Caribbean Sealong running	0	124	4	435	0.0× / 0.4
Wrecks · Arabian Sealong running	0	93	3	527	0.0× / 0.4
Surveys · Bering Sea	0	93	3	263	— / 0
Other · Coral Sealong running	0	93	3	480	0.0× / 0.6
Surveys · Gulf of Guinea	0	93	3	178	— / 0
Wrecks · Gulf of Mexicolong running	0	93	3	380	0.0× / 0.2
Exercises · Ionian Sea	0	93	3	94	0.0× / 0.4
Wrecks · North Atlantic Oceanlong running	0	93	3	425	0.0× / 0.2
Wrecks · North Pacific Ocean	0	93	3	345	— / 0
Volcanic · Philippine Sealong running	0	93	3	2,162	0.0× / 0.2
Ordnance · Black Sealong running	0	62	2	452	— / 0
Storms · Caribbean Sea	0	62	2	200	— / 0
Nav aids · Gulf of California	0	62	2	154	0.0× / 0.2
Surveys · Hudson Strait	0	62	2	176	— / 0
Wrecks · Laccadive Sea	0	62	2	295	0.0× / 0.2
Nav aids · Malacca Straitlong running	0	62	2	887	— / 0
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	62	2	719	— / 0
Nav aids · Singapore Straitlong running	0	62	2	842	0.0× / 0.2
Wrecks · The Northwestern Passages	0	62	2	217	— / 0
Nav aids · Kara Sea	0	45.2	0	—	— / 0
Nav aids · Black Sea	0	31.6	1	114	— / 0
Wrecks · Andaman or Burma Sealong running	0	31	1	449	— / 0
Wrecks · Bay of Bengal	0	31	1	78	— / 0
Wrecks · Bristol Channel	0	31	1	204	— / 0

Cite: seahazards.com Sea Ledger, 2018-03, 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.