Sea Ledger, July 2018

2018-07-01 to 2018-07-31 · archive

issued: 644
warning-days in force: 14,481
in force at month end: 458
sea × type cells: 256

baseline: same month, previous 5 years (2017-07, 2016-07, 2015-07, 2014-07, 2013-07)

By type

type	issued	warning-days	in force at end
Incidents	161	1,773.3	45
Icebergs	109	125.9	4
Exercises	97	1,252	38
Nav aids	57	4,062.1	130
Surveys	45	1,942.7	64
Quakes	34	101.2	2
Cable ops	30	431.4	14
Derelicts	25	183.9	7
Missiles	17	172.1	6
Spills	17	214	8
Other	16	633.7	21
Wrecks	13	2,840.8	93
Debris	6	45	1
Piracy	5	35	0
Restricted	4	146.5	6
Containers	4	6.8	2
Volcanic	2	174.3	6
Structures	1	64	3
Ordnance	1	167.3	5
Storms	0	109	3

By sea and type · 200 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Icebergs · Southern Oceansurge	44	45.4	1	30	220× / 0.2
Incidents · South China Sea	38	386.5	12	45	1.8× / 20.6
Icebergs · Labrador Sea	31	37.1	2	32	1.3× / 23.4
Icebergs · South Atlantic Oceansurge	31	32.4	1	30	4.2× / 7.4
Incidents · North Pacific Ocean	24	166.5	6	40	0.9× / 28
Exercises · North Pacific Ocean	21	195.8	7	65	1.1× / 19
Cable ops · North Atlantic Oceansurge	19	103.5	5	26	3.0× / 6.4
Exercises · Black Sea	18	212.1	5	34	1.1× / 16.2
Incidents · North Atlantic Ocean	14	161	2	64	0.9× / 15.6
Incidents · South Atlantic Oceansurge	13	74	2	31	2.4× / 5.4
Exercises · South China Seasurge	11	124.7	3	34	3.7× / 3
Exercises · South Atlantic Ocean	11	47.1	2	30	1.8× / 6.2
Surveys · South Atlantic Ocean	10	263.6	6	119	1.6× / 6.2
Incidents · Mediterranean Sea - Eastern Basin	9	405.4	3	44	0.5× / 18.6
Exercises · Bay of Bengalsurge	8	73.7	3	31	2.0× / 4
Spills · Gulf of Mexico	7	106	4	40	1.4× / 5
Quakes · North Pacific Ocean	7	20.8	1	31	1.4× / 5
Nav aids · North Pacific Oceansurge	6	387.1	12	276	2.5× / 2.4
Surveys · North Atlantic Ocean	6	166.2	7	257	1.8× / 3.4
Surveys · Norwegian Seasurge	6	87.9	4	60	3.3× / 1.8
Incidents · Eastern China Seasurge	6	64	5	35	7.5× / 0.8
Incidents · Philippine Sea	6	55	2	41	1.3× / 4.8
Quakes · South Pacific Ocean	6	18	0	—	0.6× / 10.8
Exercises · Mediterranean Sea - Eastern Basin	6	16.1	1	23	0.9× / 6.4
Nav aids · Caribbean Sealong running	5	674.6	23	434	1.7× / 3
Nav aids · South Atlantic Ocean	5	461.8	15	180	0.9× / 5.4
Nav aids · North Sealong running	5	145	4	391	0.5× / 10.2
Incidents · Caribbean Sea	5	76.2	1	53	0.9× / 5.6
Missiles · North Pacific Ocean	5	50	3	137	1.0× / 4.8
Exercises · Yellow Sea	5	22.5	0	—	0.3× / 14.6
Incidents · South Pacific Ocean	5	20.6	1	49	0.6× / 8.4
Quakes · Coral Seasurge	5	15.7	0	—	2.3× / 2.2
Incidents · Bismarck Seasurge	5	4.6	0	—	8.3× / 0.6
Nav aids · North Atlantic Oceanlong running	4	433.1	12	522	0.6× / 6.6
Surveys · Sea of Okhotsksurge	4	121.2	4	60	5.0× / 0.8
Incidents · Gulf of Mexico	4	92.8	2	43	0.7× / 6.2
Surveys · Barentsz Seasurge	4	55.3	3	126	3.3× / 1.2
Incidents · Davis Strait	4	38.3	1	38	1.1× / 3.6
Cable ops · Yellow Seanew	4	23	1	25	new / 0
Missiles · Southern Oceannew	4	19.2	0	—	new / 0
Quakes · Indian Ocean	4	12	0	—	1.7× / 2.4
Derelicts · Indian Ocean	4	9.4	0	—	0.9× / 4.2
Nav aids · South Pacific Oceanlong running	3	204.4	6	411	1.1× / 2.8
Other · South China Seasurgelong running	3	135.7	4	1,343	2.1× / 1.4
Wrecks · South Atlantic Oceansurge	3	77.9	2	124	5.0× / 0.6
Wrecks · East Siberian Seanew	3	76.9	3	25	new / 0
Derelicts · South China Seasurgelong running	3	67.3	2	557	2.5× / 1.2
Cable ops · South China Sea	3	46.3	1	69	0.8× / 3.6
Derelicts · South Pacific Ocean	3	37.5	1	122	1.7× / 1.8
Spills · North Atlantic Ocean	3	36	1	30	1.7× / 1.8
Nav aids · Indian Ocean	3	33.8	1	346	1.1× / 2.8
Spills · North Pacific Ocean	3	33	1	31	1.4× / 2.2
Nav aids · English Channel	3	20.1	0	—	1.3× / 2.4
Exercises · South Pacific Ocean	3	14.1	1	28	1.0× / 3
Nav aids · Irish Sea and St. George's Channel	3	12.7	1	30	1.1× / 2.6
Missiles · North Atlantic Ocean	3	9.9	1	34	0.4× / 6.8
Quakes · Arabian Seasurge	3	9	0	—	15× / 0.2
Incidents · Indian Ocean	3	0.7	0	—	0.2× / 12.8
Incidents · Coral Sea	3	0.2	0	—	0.5× / 5.6
Incidents · Tasman Seasurge	3	0.2	0	—	7.5× / 0.4
Wrecks · South China Sealong running	2	595.4	20	1,541	2.5× / 0.8
Nav aids · Gulf of Mexicolong running	2	255.6	9	543	0.6× / 3.2
Nav aids · Coral Sealong running	2	191.2	6	843	1.0× / 2
Other · Caribbean Sealong running	2	126.6	6	557	5.0× / 0.4
Nav aids · Inner Seas off the West Coast of Scotland	2	110.8	3	316	0.5× / 4.2
Wrecks · Arabian Sealong running	2	106.5	4	649	5.0× / 0.4
Surveys · Mediterranean Sea - Eastern Basin	2	96.4	3	110	1.1× / 1.8
Volcanic · Philippine Sealong running	2	81.3	3	2,284	10× / 0.2
Surveys · North Sea	2	72.1	1	90	0.7× / 2.8
Nav aids · Mediterranean Sea - Western Basin	2	63.4	3	167	10× / 0.2
Cable ops · North Sea	2	41	1	67	0.4× / 4.8
Exercises · Arabian Sea	2	39.9	1	36	0.9× / 2.2
Incidents · Gulf of Thailand	2	35.1	0	—	10× / 0.2
Exercises · Laccadive Sea	2	31.2	1	31	1.1× / 1.8
Other · Hudson Bay	2	26.4	1	45	5.0× / 0.4
Nav aids · Celtic Sea	2	21	1	20	2.5× / 0.8
Spills · Bering Sea	2	20	1	19	1.0× / 2
Incidents · Ionian Sea	2	19.7	2	36	5.0× / 0.4
Other · North Atlantic Ocean	2	18.5	0	—	1.4× / 1.4
Derelicts · North Atlantic Ocean	2	17.4	1	33	0.6× / 3.2
Exercises · North Atlantic Ocean	2	10.8	0	—	0.5× / 4.4
Nav aids · Gulf of Alaska	2	10.4	0	—	1.0× / 2
Missiles · South Pacific Ocean	2	10.4	0	—	1.0× / 2
Incidents · Ceram Seanew	2	7.8	0	—	new / 0
Restricted · North Sea	2	6.9	0	—	10× / 0.2
Containers · Bay of Bengal	2	6	0	—	10× / 0.2
Quakes · South Atlantic Ocean	2	6	0	—	1.4× / 1.4
Debris · South Pacific Ocean	2	6	0	—	5.0× / 0.4
Exercises · Coral Sea	2	5.8	0	—	1.1× / 1.8
Derelicts · Japan Sea	2	4.9	1	22	5.0× / 0.4
Quakes · Solomon Sea	2	4.7	1	12	1.0× / 2
Derelicts · Philippine Seanew	2	4.4	0	—	new / 0
Incidents · Solomon Sea	2	4.3	0	—	2.0× / 1
Derelicts · South Atlantic Ocean	2	4.2	0	—	1.7× / 1.2
Exercises · Caribbean Sea	2	1.9	0	—	2.0× / 1
Other · South Atlantic Ocean	2	1.2	0	—	5.0× / 0.4
Containers · Mediterranean Sea - Western Basinnew	2	0.8	2	0	new / 0
Ordnance · North Sea	1	105.3	3	65	1.7× / 0.6
Other · Coral Sealong running	1	93.4	3	602	1.3× / 0.8
Nav aids · Singapore Straitlong running	1	93	3	964	2.5× / 0.4
Other · The Northwestern Passages	1	63.6	2	53	1.3× / 0.8
Wrecks · Persian Gulf	1	51.6	2	48	new / 0
Wrecks · Bay of Bengal	1	44.1	1	200	5.0× / 0.2
Nav aids · Great Australian Bight	1	42.2	1	173	1.3× / 0.8
Surveys · North Pacific Ocean	1	41.5	2	36	1.3× / 0.8
Other · English Channel	1	38.6	1	49	1.3× / 0.8
Exercises · Philippine Sea	1	34.8	1	34	0.3× / 3.6
Wrecks · Gulf of Guinea	1	32.5	2	335	new / 0
Missiles · Black Sea	1	31.2	1	32	0.5× / 2
Cable ops · Barentsz Sea	1	31	1	31	0.7× / 1.4
Nav aids · Black Sea	1	31	1	236	new / 0
Surveys · Black Sea	1	31	1	40	0.5× / 2.2
Debris · Tasman Sea	1	30	1	30	new / 0
Other · Adriatic Sea	1	25.2	1	25	new / 0
Surveys · Makassar Strait	1	21.4	1	21	new / 0
Surveys · Inner Seas off the West Coast of Scotland	1	20.9	0	—	1.3× / 0.8
Nav aids · Andaman or Burma Sea	1	20.7	1	60	1.7× / 0.6
Surveys · Kara Sea	1	19.7	1	19	0.5× / 2
Incidents · Labrador Sea	1	18.6	0	—	5.0× / 0.2
Incidents · Baffin Bay	1	17.2	1	17	2.5× / 0.4
Surveys · Persian Gulf	1	16.4	1	222	5.0× / 0.2
Incidents · Tyrrhenian Sea	1	15.4	0	—	1.7× / 0.6
Derelicts · Gulf of Mexico	1	15.2	1	15	0.8× / 1.2
Surveys · Java Sea	1	14.6	1	14	new / 0
Incidents · Bass Strait	1	14.3	0	—	5.0× / 0.2
Restricted · South Atlantic Ocean	1	14	1	13	1.3× / 0.8
Spills · The Coastal Waters of Southeast Alaska and British Columbia	1	14	0	—	1.3× / 0.8
Missiles · Japan Sea	1	9.7	0	—	1.0× / 1
Incidents · Laccadive Sea	1	9.6	1	9	0.7× / 1.4
Nav aids · Aegean Sea	1	9.1	1	9	new / 0
Incidents · Mediterranean Sea - Western Basin	1	8.9	1	8	0.7× / 1.4
Derelicts · Bay of Biscay	1	8.6	1	8	5.0× / 0.2
Piracy · Bay of Bengal	1	7	0	—	new / 0
Piracy · Gulf of Guinea	1	7	0	—	0.6× / 1.8
Piracy · Indian Ocean	1	7	0	—	new / 0
Piracy · Red Sea	1	7	0	—	1.7× / 0.6
Piracy · Sulu Sea	1	7	0	—	5.0× / 0.2
Surveys · Aegean Sea	1	5.9	0	—	1.3× / 0.8
Incidents · Balearic (Iberian Sea)	1	5.9	1	5	2.5× / 0.4
Exercises · Japan Sea	1	5.9	0	—	new / 0
Nav aids · Kara Sea	1	5.6	1	5	5.0× / 0.2
Exercises · Celebes Sea	1	5.5	0	—	new / 0
Cable ops · Caribbean Sea	1	5.1	1	5	1.0× / 1
Spills · Gulf of Alaska	1	5	1	5	1.3× / 0.8
Missiles · Laccadive Sea	1	4.9	0	—	1.0× / 1
Icebergs · Kara Sea	1	4.7	0	—	new / 0
Surveys · Indian Ocean	1	4.4	0	—	2.5× / 0.4
Other · Tasman Sea	1	3.1	0	—	2.5× / 0.4
Derelicts · Arafura Sea	1	3	0	—	2.5× / 0.4
Quakes · Bali Sea	1	3	0	—	new / 0
Quakes · Banda Sea	1	3	0	—	5.0× / 0.2
Derelicts · Caribbean Sea	1	3	0	—	1.0× / 1
Quakes · Celebes Sea	1	3	0	—	new / 0
Debris · Coral Sea	1	3	0	—	new / 0
Derelicts · Great Australian Bight	1	3	0	—	new / 0
Debris · Indian Ocean	1	3	0	—	1.0× / 1
Icebergs · Laptev Sea	1	3	0	—	1.7× / 0.6
Derelicts · Mediterranean Sea - Western Basin	1	3	0	—	5.0× / 0.2
Icebergs · North Atlantic Ocean	1	3	0	—	0.3× / 3.6
Debris · North Pacific Ocean	1	3	0	—	1.7× / 0.6
Derelicts · North Pacific Ocean	1	3	0	—	0.8× / 1.2
Quakes · Sea of Okhotsk	1	3	0	—	5.0× / 0.2
Quakes · Southern Ocean	1	3	0	—	1.0× / 1
Incidents · Java Sea	1	2.5	0	—	1.3× / 0.8
Structures · South Atlantic Ocean	1	2	1	1	new / 0
Restricted · Barentsz Sea	1	1.6	1	1	5.0× / 0.2
Nav aids · Adriatic Sea	1	1.5	1	1	new / 0
Exercises · Bering Sea	1	1.1	0	—	0.6× / 1.6
Surveys · Solomon Sea	1	0.9	1	0	new / 0
Incidents · Flores Sea	1	0.5	1	0	new / 0
Surveys · Celtic Sea	1	0.4	1	0	1.0× / 1
Incidents · Timor Sea	1	0.2	0	—	0.8× / 1.2
Incidents · Arafura Sea	1	0.1	0	—	0.6× / 1.6
Nav aids · Timor Sea	1	0	0	—	1.0× / 1
Wrecks · Caribbean Sealong running	0	651	21	561	0.0× / 0.2
Exercises · Aegean Sea	0	310	10	216	0.0× / 1.2
Surveys · Arctic Oceanlong running	0	186	6	1,470	0.0× / 0.4
Wrecks · North Sealong running	0	181.9	5	489	0.0× / 1
Surveys · Beaufort Sealong running	0	155	5	2,131	0.0× / 0.6
Surveys · The Northwestern Passageslong running	0	155	5	2,185	— / 0
Wrecks · North Atlantic Oceanlong running	0	124	4	547	0.0× / 0.2
Wrecks · North Pacific Oceanlong running	0	124	4	467	— / 0
Surveys · Bering Sealong running	0	116.4	3	385	0.0× / 1.6
Nav aids · Bay of Bengallong running	0	93	3	473	0.0× / 0.2
Wrecks · English Channel	0	93	3	152	0.0× / 0.4
Nav aids · Gulf of California	0	93	3	276	— / 0
Wrecks · Gulf of Mexicolong running	0	93	3	502	0.0× / 0.4
Exercises · Ionian Sea	0	93	3	216	— / 0
Wrecks · Laccadive Sealong running	0	93	3	417	— / 0
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	93	3	841	— / 0
Nav aids · South China Sea	0	83.5	2	258	— / 0
Surveys · South China Sea	0	73	2	218	0.0× / 2
Nav aids · Arabian Sealong running	0	72.5	2	460	0.0× / 1
Nav aids · Tasman Sealong running	0	66	2	518	0.0× / 0.4
Wrecks · Bristol Channel	0	62	2	326	0.0× / 0.4
Storms · Caribbean Sea	0	62	2	322	— / 0
Volcanic · Caribbean Sea	0	62	2	140	0.0× / 0.2
Nav aids · Gulf of Thailand	0	62	2	188	— / 0
Wrecks · Indian Oceanlong running	0	62	2	390	0.0× / 0.4
Wrecks · Irish Sea and St. George's Channellong running	0	62	2	568	0.0× / 0.2

Cite: seahazards.com Sea Ledger, 2018-07, 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.