Sea Ledger, October 2026

2026-10-01 to 2026-10-31 · month in progress · live

issued: 35
warning-days in force: 349
in force at month end: 350
sea × type cells: 138

baseline: same month, previous 5 years (2023-10, 2022-10, 2021-10)

By type

type	issued	warning-days	in force at end
Exercises	8	31.1	28
Nav aids	7	129	132
Storms	5	2.1	5
Surveys	4	53.7	55
Icebergs	4	7.2	6
Wrecks	3	37.1	38
Cable ops	2	23.4	24
Other	1	15.7	16
Missiles	1	6.9	4
Debris	0	3.6	3
Quakes	0	3	3
Spills	0	6.9	7
Structures	0	2	2
Volcanic	0	10.5	11
Derelicts	0	6	6
Mines	0	5.8	6
War risk	0	1.9	2
Restricted	0	1.9	2
Piracy	0	0.7	0

By sea and type · 138 cells, most issued first

cell	issued	warning-days	at end	longest d	vs 5 y
Nav aids · North Pacific Oceanlong running	3	10.5	10	1,630	0.6× / 5.33
Nav aids · Coral Sea	3	2.6	2	1	1.1× / 2.67
Exercises · Bay of Bengal	3	1.5	1	6	0.2× / 15
Storms · North Pacific Oceannew	3	0.3	3	0	new / 0
Icebergs · Laptev Sea	2	2.2	2	6	1.0× / 2
Storms · Philippine Sea	2	1.8	2	83	2.0× / 1
Surveys · Mediterranean Sea - Eastern Basin	2	1.3	1	0	1.5× / 1.33
Wrecks · Coral Seanew	2	0.4	0	—	new / 0
Nav aids · North Atlantic Oceanlong running	1	13.7	14	1,738	0.1× / 8.33
Exercises · Arabian Sea	1	4	4	37	0.1× / 17
Surveys · South Atlantic Ocean	1	3.9	4	307	0.0× / 24.33
Wrecks · Arabian Sealong running	1	3	3	884	3.0× / 0.33
Exercises · Black Sealong running	1	2.9	2	1,653	0.1× / 13.33
Icebergs · Southern Ocean	1	2.4	2	93	0.0× / 46.33
Cable ops · North Pacific Oceanlong running	1	2	2	703	0.8× / 1.33
Other · South Atlantic Ocean	1	2	2	64	1.5× / 0.67
Exercises · Laccadive Sea	1	1.2	1	6	0.2× / 5.33
Icebergs · South Atlantic Ocean	1	1	1	6	0.1× / 11.33
Exercises · North Atlantic Ocean	1	0.5	0	—	0.1× / 13
Exercises · Coral Sea	1	0.4	0	—	0.8× / 1.33
Missiles · Sea of Okhotsk	1	0.3	0	—	3.0× / 0.33
Surveys · Laccadive Sea	1	0.2	0	—	1.0× / 1
Cable ops · Andaman or Burma Sea	1	0.1	0	—	new / 0
Nav aids · Caribbean Sealong running	0	47	49	2,053	0.0× / 3.67
Surveys · North Atlantic Oceanlong running	0	13.4	14	1,002	0.0× / 11
Exercises · North Pacific Ocean	0	12.2	12	41	0.0× / 24.67
Nav aids · South Pacific Oceanlong running	0	10.5	11	966	0.0× / 3.67
Volcanic · Philippine Sealong running	0	8.6	9	1,906	0.0× / 2.33
Surveys · Black Sealong running	0	6.7	7	640	0.0× / 0.33
Nav aids · Gulf of Mexicolong running	0	6.7	7	2,008	0.0× / 2.67
Surveys · Indian Ocean	0	5.8	6	186	0.0× / 6.33
Nav aids · Persian Gulf	0	5.8	6	361	0.0× / 0.33
Nav aids · South Atlantic Ocean	0	5.8	6	161	0.0× / 5.33
Mines · Black Sealong running	0	4.8	5	1,679	0.0× / 0.67
Wrecks · North Atlantic Ocean	0	4.8	5	205	0.0× / 1.33
Wrecks · Persian Gulflong running	0	4.8	5	980	— / 0
Wrecks · South China Sealong running	0	4.8	5	2,765	0.0× / 0.33
Wrecks · Caribbean Sealong running	0	3.8	4	814	0.0× / 1
Surveys · Persian Gulflong running	0	3.8	4	495	0.0× / 7.33
Wrecks · The Northwestern Passageslong running	0	3.8	4	396	0.0× / 0.67
Missiles · North Atlantic Ocean	0	3	1	1	0.0× / 15.67
Other · Caribbean Sealong running	0	2.9	3	1,310	0.0× / 0.33
Nav aids · Great Australian Bight	0	2.9	3	94	0.0× / 0.33
Cable ops · North Atlantic Ocean	0	2.9	3	272	0.0× / 5.67
Spills · North Pacific Ocean	0	2.9	3	9	0.0× / 2.33
Other · Persian Gulflong running	0	2.9	3	626	— / 0
Surveys · Sea of Okhotsk	0	2.9	3	161	0.0× / 1
Wrecks · South Atlantic Oceanlong running	0	2.9	3	488	0.0× / 1
Missiles · North Pacific Oceanlong running	0	2.6	2	1,311	0.0× / 3
Exercises · Aegean Sea	0	1.9	2	240	0.0× / 0.33
Nav aids · Arabian Sea	0	1.9	2	103	0.0× / 1
Surveys · Bass Strait	0	1.9	2	42	0.0× / 0.67
Nav aids · Beaufort Sealong running	0	1.9	2	1,143	0.0× / 1
Nav aids · Bering Sealong running	0	1.9	2	478	— / 0
Surveys · Bering Sea	0	1.9	2	14	— / 0
Cable ops · Black Sea	0	1.9	2	359	— / 0
Other · Black Sealong running	0	1.9	2	912	— / 0
War risk · Black Sealong running	0	1.9	2	1,653	— / 0
Wrecks · Gulf of Guinea	0	1.9	2	133	— / 0
Nav aids · Gulf of Omanlong running	0	1.9	2	907	— / 0
Wrecks · Java Sea	0	1.9	2	38	— / 0
Debris · North Pacific Oceanlong running	0	1.9	2	463	0.0× / 0.67
Volcanic · North Pacific Ocean	0	1.9	2	77	— / 0
Cable ops · Persian Gulf	0	1.9	2	53	0.0× / 1.67
Restricted · Persian Gulflong running	0	1.9	2	633	— / 0
Nav aids · Philippine Sea	0	1.9	2	38	— / 0
Nav aids · Sea of Okhotsklong running	0	1.9	2	610	— / 0
Cable ops · Singapore Strait	0	1.9	2	6	— / 0
Nav aids · Singapore Strait	0	1.9	2	102	— / 0
Cable ops · South Atlantic Ocean	0	1.9	2	91	0.0× / 0.67
Exercises · South Atlantic Ocean	0	1.9	2	64	0.0× / 13.67
Cable ops · South China Sea	0	1.9	2	56	0.0× / 1
Cable ops · Tasman Sea	0	1.9	2	94	— / 0
Surveys · The Northwestern Passages	0	1.9	2	6	0.0× / 1
Icebergs · Labrador Sea	0	1.6	1	7	0.0× / 29.33
Exercises · Philippine Sea	0	1.6	1	6	0.0× / 3
Missiles · Aegean Sea	0	1	1	240	— / 0
Exercises · Andaman or Burma Sea	0	1	1	6	0.0× / 5.67
Derelicts · Arabian Sea	0	1	1	72	0.0× / 0.33
Surveys · Arabian Sea	0	1	1	6	0.0× / 11.33
Derelicts · Arafura Sea	0	1	1	59	0.0× / 0.33
Surveys · Arctic Oceanlong running	0	1	1	653	0.0× / 0.67
Other · Bass Strait	0	1	1	13	— / 0
Nav aids · Bay of Bengal	0	1	1	160	— / 0
Cable ops · Bering Sea	0	1	1	13	— / 0
Wrecks · Bismarck Sea	0	1	1	25	— / 0
Debris · Black Sea	0	1	1	6	— / 0
Nav aids · Black Sealong running	0	1	1	745	— / 0
Structures · Black Sea	0	1	1	23	— / 0
Exercises · Caribbean Sealong running	0	1	1	555	0.0× / 2.67
Spills · Caribbean Sealong running	0	1	1	666	0.0× / 0.33
Surveys · Caribbean Sea	0	1	1	7	0.0× / 3.33
Other · Davis Strait	0	1	1	314	— / 0
Wrecks · Eastern China Sealong running	0	1	1	1,161	— / 0
Cable ops · Great Australian Bight	0	1	1	124	— / 0
Other · Great Australian Bight	0	1	1	124	0.0× / 0.33
Surveys · Great Australian Bight	0	1	1	45	— / 0
Nav aids · Gulf of Alaska	0	1	1	322	0.0× / 2
Spills · Gulf of Alaska	0	1	1	3	0.0× / 0.33
Nav aids · Gulf of Californialong running	0	1	1	1,630	— / 0
Nav aids · Gulf of Guinea	0	1	1	103	— / 0
Surveys · Gulf of Guinea	0	1	1	27	— / 0
Wrecks · Gulf of Mexico	0	1	1	254	— / 0
Derelicts · Gulf of Omanlong running	0	1	1	469	— / 0
Nav aids · Hudson Bay	0	1	1	80	0.0× / 1.33
Nav aids · Hudson Strait	0	1	1	80	0.0× / 0.33
Cable ops · Indian Ocean	0	1	1	16	0.0× / 0.67
Nav aids · Indian Ocean	0	1	1	48	0.0× / 3.33
Other · Indian Oceanlong running	0	1	1	975	0.0× / 1.33
Wrecks · Laccadive Sea	0	1	1	35	0.0× / 0.33
Cable ops · Laptev Sea	0	1	1	57	— / 0
Cable ops · Makassar Strait	0	1	1	247	— / 0
Surveys · Makassar Strait	0	1	1	247	— / 0
Cable ops · Mediterranean Sea - Eastern Basin	0	1	1	3	0.0× / 0.33
Nav aids · Mediterranean Sea - Eastern Basinlong running	0	1	1	693	— / 0
Cable ops · Mediterranean Sea - Western Basin	0	1	1	3	— / 0
Exercises · Mediterranean Sea - Western Basin	0	1	1	98	0.0× / 0.67
Other · Mediterranean Sea - Western Basin	0	1	1	96	0.0× / 0.33
Surveys · Mozambique Channel	0	1	1	8	— / 0
Derelicts · North Atlantic Ocean	0	1	1	1	0.0× / 4.33
Other · North Atlantic Ocean	0	1	1	77	0.0× / 1.33
Spills · North Atlantic Ocean	0	1	1	3	0.0× / 2.67
Quakes · North Pacific Ocean	0	1	1	1	0.0× / 3.33
Structures · North Pacific Ocean	0	1	1	336	— / 0
Wrecks · North Pacific Oceanlong running	0	1	1	441	— / 0
Surveys · Norwegian Sea	0	1	1	34	0.0× / 0.33
Derelicts · Persian Gulf	0	1	1	7	— / 0
Mines · Persian Gulf	0	1	1	105	— / 0
Quakes · Philippine Sea	0	1	1	1	0.0× / 6
Derelicts · Red Sealong running	0	1	1	651	— / 0
Quakes · South Atlantic Ocean	0	1	1	2	0.0× / 1.67
Nav aids · South China Sealong running	0	1	1	1,032	0.0× / 0.33
Surveys · South China Sea	0	1	1	56	0.0× / 0.67
Spills · The Coastal Waters of Southeast Alaska and British Columbia	0	1	1	10	0.0× / 1.67
Surveys · Timor Sea	0	1	1	3	0.0× / 1
Debris · Bay of Bengal	0	0.7	0	—	0.0× / 0.33
Piracy · Singapore Strait	0	0.7	0	—	0.0× / 0.33
Nav aids · Timor Sea	0	0.2	0	—	— / 0

Cite: seahazards.com Sea Ledger, 2026-10, retrieved 2026-10-01

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.