Sea Ledger, April 2015

2015-04-01 to 2015-04-30 · archive

issued: 572
warning-days in force: 10,555
in force at month end: 328
sea × type cells: 240

baseline: same month, previous 5 years (2014-04, 2013-04, 2012-04, 2011-04, 2010-04)

By type

type	issued	warning-days	in force at end
Incidents	158	1,431.3	36
Exercises	120	1,124.5	26
Nav aids	48	2,479.1	83
Cable ops	43	1,079.2	43
Surveys	42	1,392.9	51
Icebergs	35	52.5	2
Missiles	30	261.8	3
Derelicts	22	285.6	7
Quakes	22	76.7	4
Other	19	557.3	19
Spills	14	226	4
Wrecks	5	1,071.9	35
Debris	5	16.7	0
Ordnance	3	49.7	3
Piracy	3	47.6	0
Restricted	2	158.9	5
Structures	1	143	4
Volcanic	0	40.5	1
War risk	0	60	2

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Incidents · North Pacific Ocean	28	121.2	0	—	1.2× / 23.4
Incidents · Mediterranean Sea - Eastern Basinsurge	26	382.1	4	57	6.8× / 3.8
Incidents · North Atlantic Ocean	22	207.6	12	54	1.8× / 12
Exercises · North Pacific Ocean	19	162.4	3	43	1.4× / 13.2
Exercises · Black Seasurge	19	133.1	0	—	3.3× / 5.8
Icebergs · North Atlantic Oceansurge	19	19.6	2	19	4.8× / 4
Exercises · Yellow Seasurge	17	124.4	6	36	2.4× / 7
Incidents · South China Sea	17	106	2	110	1.9× / 9.2
Missiles · North Atlantic Oceansurge	14	155.8	2	45	4.4× / 3.2
Surveys · Bristol Channelnew	11	20.2	1	25	new / 0
Icebergs · Labrador Sea	10	12	0	—	1.0× / 10.4
Nav aids · North Sealong running	9	244.2	7	880	0.9× / 9.6
Spills · Gulf of Mexicosurge	9	147	1	44	2.5× / 3.6
Incidents · Gulf of Mexicosurge	9	103.3	1	48	9.0× / 1
Nav aids · South Atlantic Ocean	8	470.3	18	173	1.1× / 7
Incidents · South Atlantic Ocean	8	115.4	5	71	1.3× / 6
Incidents · Coral Seasurge	8	35.8	1	28	3.6× / 2.2
Quakes · South Pacific Ocean	8	29.1	1	31	0.6× / 13.2
Exercises · North Atlantic Ocean	8	20.4	0	—	1.6× / 5
Exercises · Arabian Sea	7	79.9	2	42	1.2× / 6
Exercises · Bay of Bengal	7	66.3	2	63	0.9× / 7.8
Incidents · Philippine Seasurge	7	62.1	0	—	4.4× / 1.6
Incidents · Indian Ocean	7	39.7	4	59	0.9× / 8
Cable ops · North Atlantic Ocean	6	97.5	6	39	1.3× / 4.8
Icebergs · South Atlantic Oceansurge	6	18.3	0	—	6.0× / 1
Surveys · North Atlantic Oceansurge	5	182.6	5	331	5.0× / 1
Cable ops · North Seasurge	5	140.3	4	77	2.5× / 2
Incidents · Arabian Seasurge	5	51.5	3	67	3.6× / 1.4
Other · Mediterranean Sea - Eastern Basinsurge	5	43.6	0	—	5.0× / 1
Cable ops · Mediterranean Sea - Eastern Basinsurge	5	43.5	2	113	2.8× / 1.8
Nav aids · Inner Seas off the West Coast of Scotlandlong running	5	42.5	1	665	1.5× / 3.4
Exercises · South Pacific Ocean	5	24.6	1	34	1.8× / 2.8
Incidents · South Pacific Ocean	5	18.3	0	—	0.7× / 7.4
Surveys · South Atlantic Ocean	4	199	7	274	0.7× / 5.6
Surveys · Indian Oceansurge	4	108.8	6	110	10× / 0.4
Surveys · Bay of Bengalsurge	4	89.6	3	51	10× / 0.4
Cable ops · South China Seasurge	4	72.4	4	204	2.0× / 2
Exercises · South China Seasurge	4	65.4	2	30	2.0× / 2
Missiles · Barentsz Sea	4	24.2	0	—	1.7× / 2.4
Exercises · Caribbean Seasurge	4	22.4	0	—	20× / 0.2
Exercises · Gulf of Mexicosurge	4	15.8	1	24	6.7× / 0.6
Exercises · Andaman or Burma Seasurge	4	14.5	0	—	3.3× / 1.2
Incidents · Caribbean Sea	4	12.7	2	9	1.4× / 2.8
Missiles · Black Seasurge	4	7.2	0	—	20× / 0.2
Exercises · Mediterranean Sea - Eastern Basin	4	6.4	0	—	0.8× / 4.8
Surveys · Celtic Seasurge	4	3	0	—	20× / 0.2
Nav aids · Coral Sealong running	3	186.4	6	377	1.1× / 2.8
Cable ops · South Atlantic Ocean	3	121.4	3	203	0.1× / 22
Nav aids · Gulf of Mexicolong running	3	110	5	439	1.7× / 1.8
Derelicts · Gulf of Mexicosurge	3	82	1	94	7.5× / 0.4
Exercises · Philippine Sea	3	58.2	1	35	0.8× / 4
Derelicts · North Atlantic Ocean	3	43.4	1	253	0.8× / 4
Spills · North Pacific Oceansurge	3	38	2	36	3.8× / 0.8
Exercises · Laccadive Sea	3	37.5	1	31	1.1× / 2.8
Nav aids · Laccadive Seasurgelong running	3	33.2	2	734	15× / 0.2
Nav aids · English Channellong running	3	33.1	1	1,120	1.0× / 3
Derelicts · South Atlantic Oceansurge	3	32.2	0	—	7.5× / 0.4
Cable ops · Mediterranean Sea - Western Basinsurge	3	24.2	0	—	5.0× / 0.6
Piracy · South China Sea	3	22.3	0	—	1.0× / 3
Missiles · North Pacific Ocean	3	14.9	0	—	0.4× / 8
Exercises · Baltic Sea	3	14.3	0	—	1.3× / 2.4
Nav aids · The Coastal Waters of Southeast Alaska and British Columbia	3	13	1	17	1.5× / 2
Cable ops · Barentsz Seasurge	3	12.6	2	222	15× / 0.2
Quakes · Solomon Sea	3	12.6	1	31	0.6× / 5.2
Derelicts · North Pacific Ocean	3	12.1	1	30	0.7× / 4.6
Quakes · Philippine Seasurge	3	9	0	—	2.5× / 1.2
Derelicts · Mediterranean Sea - Eastern Basinsurge	3	6.4	1	22	3.8× / 0.8
Nav aids · North Atlantic Oceanlong running	2	204.3	6	756	0.5× / 4.4
Exercises · Aegean Sea	2	188.2	5	118	5.0× / 0.4
Surveys · Caribbean Seanew	2	97.9	4	223	new / 0
Other · North Sealong running	2	65.4	2	960	1.4× / 1.4
Cable ops · Eastern China Sea	2	58.4	2	29	5.0× / 0.4
Nav aids · Bass Straitlong running	2	37.6	1	759	10× / 0.2
Incidents · Mozambique Channel	2	36	1	44	1.1× / 1.8
Derelicts · South Pacific Oceanlong running	2	35.2	1	1,037	2.0× / 1
Incidents · Gulf of Thailandnew	2	29.9	0	—	new / 0
Cable ops · Norwegian Sea	2	21.7	2	11	2.5× / 0.8
Surveys · Gulf of Suez	2	18.4	1	20	10× / 0.2
Cable ops · Irish Sea and St. George's Channelnew	2	16.8	1	20	new / 0
Exercises · South Atlantic Ocean	2	16.8	0	—	0.3× / 7.8
Other · Indian Ocean	2	13.8	1	13	2.5× / 0.8
Missiles · Bay of Bengal	2	11	0	—	1.7× / 1.2
Quakes · Indian Ocean	2	7.4	0	—	0.4× / 5.6
Debris · Mediterranean Sea - Eastern Basinnew	2	6	0	—	new / 0
Ordnance · Persian Gulf	2	4.1	2	3	10× / 0.2
Exercises · Coral Sea	2	3.9	0	—	2.5× / 0.8
Incidents · Tasman Sea	2	2.6	0	—	1.7× / 1.2
Nav aids · Indian Oceanlong running	1	125	4	435	1.7× / 0.6
Cable ops · Gulf of Mexicolong running	1	106.7	3	454	0.6× / 1.8
Nav aids · Arabian Sealong running	1	104.8	3	1,035	0.8× / 1.2
Cable ops · Arabian Sea	1	100	3	108	0.3× / 3.2
Wrecks · North Atlantic Oceanlong running	1	77.9	3	1,300	new / 0
Other · South China Sealong running	1	71.6	2	617	1.0× / 1
Other · North Pacific Oceanlong running	1	60.7	3	1,109	0.7× / 1.4
Nav aids · Mediterranean Sea - Eastern Basin	1	60	2	183	5.0× / 0.2
Cable ops · Gulf of Guinea	1	58.3	2	74	0.5× / 2.2
Other · Bay of Bengal	1	46	1	66	5.0× / 0.2
Nav aids · Andaman or Burma Sea	1	36.5	1	196	2.5× / 0.4
Surveys · Tasman Sea	1	36.4	1	105	5.0× / 0.2
Nav aids · Celtic Sealong running	1	32.2	1	917	0.6× / 1.6
Surveys · Black Sea	1	30.6	2	101	1.0× / 1
Other · Irish Sea and St. George's Channel	1	30	1	52	5.0× / 0.2
Wrecks · Gulf of Mexico	1	24.3	1	24	new / 0
Wrecks · Malacca Strait	1	21.7	1	21	new / 0
Other · Persian Gulf	1	20.6	1	20	new / 0
Surveys · Gulf of Guinea	1	17.3	1	17	new / 0
Incidents · Celtic Sea	1	16.6	1	16	new / 0
Wrecks · North Pacific Ocean	1	16.1	1	16	new / 0
Other · Coral Sea	1	15.8	1	15	5.0× / 0.2
Structures · Mediterranean Sea - Eastern Basin	1	15.8	0	—	new / 0
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	new / 0
Cable ops · Andaman or Burma Sea	1	13.5	1	48	5.0× / 0.2
Nav aids · Black Sea	1	13.4	1	13	new / 0
Cable ops · Philippine Sea	1	12.9	1	63	5.0× / 0.2
Surveys · South China Sea	1	12.4	1	12	1.7× / 0.6
Surveys · South Pacific Ocean	1	12.4	0	—	2.5× / 0.4
Incidents · Solomon Sea	1	10.7	0	—	2.5× / 0.4
Ordnance · North Pacific Ocean	1	10.2	0	—	1.0× / 1
Spills · Gulf of Alaska	1	10	1	10	new / 0
Derelicts · Philippine Sea	1	8.6	0	—	0.5× / 2
Missiles · Japan Sea	1	8	0	—	0.6× / 1.6
Incidents · Ionian Sea	1	7.9	0	—	new / 0
Incidents · Singapore Strait	1	7.8	0	—	5.0× / 0.2
Incidents · Bay of Bengal	1	7.4	0	—	2.5× / 0.4
Exercises · Adriatic Sea	1	7.1	0	—	1.7× / 0.6
Other · Laccadive Sea	1	6.1	1	6	new / 0
Missiles · Laccadive Sea	1	5.6	0	—	1.3× / 0.8
Cable ops · Mozambique Channel	1	5.6	1	5	1.3× / 0.8
Quakes · Coral Sea	1	5.5	0	—	0.4× / 2.8
Debris · North Atlantic Ocean	1	4.7	0	—	0.7× / 1.4
Missiles · South Pacific Ocean	1	4.5	0	—	0.4× / 2.4
Other · English Channel	1	4.4	1	44	5.0× / 0.2
Derelicts · Caribbean Sea	1	4	0	—	1.7× / 0.6
Quakes · Molukka Sea	1	3.3	0	—	1.7× / 0.6
Wrecks · Gulf of Guinea	1	3.1	1	210	new / 0
Restricted · Red Sea	1	3.1	0	—	new / 0
Derelicts · Bay of Bengal	1	3	0	—	new / 0
Debris · Indian Ocean	1	3	0	—	1.7× / 0.6
Derelicts · Indian Ocean	1	3	0	—	0.2× / 5.4
Quakes · Mediterranean Sea - Eastern Basin	1	3	0	—	new / 0
Quakes · North Pacific Ocean	1	3	0	—	0.1× / 10.6
Debris · Timor Sea	1	3	0	—	2.5× / 0.4
Other · Timor Sea	1	3	0	—	5.0× / 0.2
Cable ops · Singapore Strait	1	2.6	1	2	new / 0
Exercises · Gulf of Alaska	1	2.2	0	—	5.0× / 0.2
Quakes · Gulf of Mexico	1	2.2	1	2	5.0× / 0.2
Restricted · Gulf of Suez	1	2.2	0	—	new / 0
Cable ops · Laccadive Sea	1	1.5	1	1	2.5× / 0.4
Incidents · Bismarck Sea	1	0.9	0	—	5.0× / 0.2
Exercises · Bering Sea	1	0.7	0	—	0.7× / 1.4
Nav aids · South Pacific Ocean	1	0.7	1	0	1.7× / 0.6
Quakes · Southern Ocean	1	0.6	1	0	1.7× / 0.6
Derelicts · Laccadive Sea	1	0.4	1	0	5.0× / 0.2
Surveys · Andaman or Burma Sea	1	0.3	1	0	2.5× / 0.4
Other · Arafura Sea	1	0.1	0	—	new / 0
Wrecks · Arabian Sealong running	0	196.4	6	742	0.0× / 1.2
Surveys · Arctic Oceanlong running	0	180	6	1,648	— / 0
Surveys · Beaufort Sealong running	0	150	5	1,723	— / 0
Nav aids · Caribbean Sealong running	0	150	5	563	— / 0
Nav aids · North Pacific Ocean	0	106.8	3	293	0.0× / 2.4
Restricted · North Sealong running	0	93.6	3	1,347	0.0× / 0.2
Wrecks · Persian Gulf	0	90	3	60	— / 0
Wrecks · Solomon Sea	0	90	3	51	— / 0
Nav aids · South China Sealong running	0	90	3	1,354	0.0× / 0.2
Wrecks · South Atlantic Ocean	0	82.9	1	187	0.0× / 0.4
Wrecks · North Sealong running	0	63.6	2	780	0.0× / 0.2
Nav aids · Great Australian Bight	0	60	2	57	0.0× / 0.6
Exercises · Ionian Sea	0	60	2	114	0.0× / 0.2
Nav aids · Kara Sealong running	0	60	2	1,331	— / 0
War risk · Mediterranean Sea - Eastern Basinlong running	0	60	2	1,436	— / 0
Nav aids · Persian Gulflong running	0	60	2	659	0.0× / 0.4
Nav aids · Sea of Okhotsklong running	0	60	2	1,227	— / 0
Wrecks · South China Sea	0	60	2	353	0.0× / 0.2
Other · Caribbean Sea	0	54.4	1	111	0.0× / 1
Cable ops · Persian Gulf	0	44.3	1	93	0.0× / 1.6
Wrecks · Caribbean Sea	0	38.7	1	198	0.0× / 0.6
Volcanic · Philippine Sealong running	0	38.7	1	1,096	0.0× / 0.4
Structures · North Sealong running	0	35.4	1	1,354	0.0× / 0.2
Nav aids · Mediterranean Sea - Western Basin	0	31.8	1	196	0.0× / 0.4
Other · North Atlantic Oceanlong running	0	31.8	1	535	0.0× / 0.4
Structures · South Atlantic Ocean	0	31.8	1	89	— / 0
Missiles · Aegean Sea	0	30	1	118	— / 0
Derelicts · Arabian Sea	0	30	1	62	0.0× / 0.2
Other · Arabian Sea	0	30	1	69	0.0× / 0.2
Structures · Arabian Sea	0	30	1	281	— / 0
Wrecks · Arctic Oceanlong running	0	30	1	615	— / 0
Wrecks · Barentsz Sealong running	0	30	1	372	0.0× / 0.2
Nav aids · Bay of Bengallong running	0	30	1	419	0.0× / 1.2
Wrecks · Bay of Bengal	0	30	1	261	— / 0
Surveys · Bering Sea	0	30	1	300	— / 0
Cable ops · Black Sea	0	30	1	210	0.0× / 0.8
Restricted · Black Sealong running	0	30	1	694	— / 0
Surveys · Chukchi Sea	0	30	1	218	— / 0
Surveys · Coral Sealong running	0	30	1	554	— / 0
Wrecks · Coral Sealong running	0	30	1	519	— / 0
Wrecks · East Siberian Sea	0	30	1	191	— / 0
Nav aids · Eastern China Sealong running	0	30	1	1,171	— / 0
Wrecks · Eastern China Sealong running	0	30	1	545	— / 0
Ordnance · Inner Seas off the West Coast of Scotlandlong running	0	30	1	692	0.0× / 0.4
Wrecks · Japan Sea	0	30	1	357	— / 0

Cite: seahazards.com Sea Ledger, 2015-04, 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.