Sea Ledger, November 2025

2025-11-01 to 2025-11-30 · gap

issued
109
warning-days in force
19,713
in force at month end
702
sea × type cells
201

Coverage note: the NGA archive ends 2024-05 and live collection began 2026-08-17. Warnings issued in between are here only if they were still in force when collection started, so this period is under-counted.

baseline: same month, previous 5 years — not available for this month (needs three fully collected reference months)

By type

typeissuedwarning-daysin force at end
Quakes37142.14
Surveys163,233120
Incidents9168.212
Spills933711
Cable ops91,424.553
Nav aids77,262.5246
Exercises71,85468
Missiles7598.626
Other5697.927
Wrecks22,385.281
Restricted1140.35
Mines01505
Icebergs0602
Piracy0903
Derelicts01505
Towing0602
Structures0903
Debris01204
War risk0602
Storms0301
Volcanic054018
Ordnance0903
Containers0301

By sea and type · 200 cells, most issued first

cellissuedwarning-daysvs 5 y
Quakes · North Pacific Ocean2060
Quakes · South Pacific Ocean924.9
Surveys · Bay of Bengal6113.1
Incidents · South China Sea639.8
Surveys · Arabian Sea4258.1
Missiles · South Pacific Oceanlong running4159.5
Spills · Gulf of Mexico477
Missiles · Indian Ocean379.1
Nav aids · South Pacific Oceanlong running2558.6
Exercises · North Pacific Oceanlong running2550
Exercises · Bay of Bengal2334.5
Cable ops · Arabian Sea2174.9
Cable ops · North Pacific Oceanlong running270.9
Spills · North Atlantic Oceanlong running248
Spills · North Pacific Ocean224
Other · Arabian Sea28.9
Nav aids · North Atlantic Oceanlong running1821.5
Surveys · Indian Oceanlong running1451.9
Surveys · Persian Gulflong running1333.2
Surveys · South Atlantic Oceanlong running1272.9
Surveys · South Pacific Oceanlong running1204.9
Wrecks · South Pacific Oceanlong running1162
Nav aids · Coral Sealong running1154.5
Restricted · Persian Gulf1110.3
Nav aids · Gulf of Alaskalong running1107.1
Nav aids · Andaman or Burma Sealong running1103.4
Nav aids · Bay of Bengallong running187.4
Cable ops · South Atlantic Oceanlong running165.2
Exercises · Arabian Sea163.2
Incidents · Laccadive Sea145.4
Incidents · Gulf of Thailand135.7
Exercises · Laccadive Sea133.4
Surveys · Tasman Sealong running133
Cable ops · Gulf of Oman128.4
Spills · The Coastal Waters of Southeast Alaska and British Columbia126
Cable ops · Coral Sea123.7
Incidents · Arabian Sea117.3
Other · Laccadive Sea110.5
Other · South China Sea19.4
Other · Davis Strait19.1
Cable ops · Malacca Strait17.5
Quakes · Indian Ocean15.9
Surveys · Malacca Strait15.9
Cable ops · Great Australian Bight13.9
Quakes · South Atlantic Ocean13.3
Wrecks · Gulf of Oman13.2
Quakes · Banda Sea13
Quakes · Gulf of Alaska13
Quakes · Gulf of California13
Quakes · Gulf of Tomini13
Quakes · Norwegian Sea13
Quakes · Sulu Sea13
Exercises · South Pacific Ocean12.9
Nav aids · Caribbean Sealong running01,920
Volcanic · Philippine Sealong running0480
Nav aids · South Atlantic Oceanlong running0480
Nav aids · North Pacific Oceanlong running0390
Nav aids · Gulf of Mexicolong running0360
Wrecks · Arabian Sealong running0270
Wrecks · The Northwestern Passageslong running0270
Wrecks · Persian Gulflong running0240
Wrecks · South Atlantic Oceanlong running0240
Nav aids · South China Sealong running0240
Nav aids · Arabian Sealong running0210
Wrecks · Caribbean Sealong running0210
Cable ops · North Atlantic Oceanlong running0210
Surveys · North Atlantic Oceanlong running0210
Cable ops · Persian Gulflong running0210
Surveys · The Northwestern Passageslong running0210
Nav aids · Celtic Sealong running0180
Wrecks · North Atlantic Oceanlong running0180
Wrecks · South China Sealong running0180
Nav aids · Beaufort Sealong running0150
Mines · Black Sealong running0150
Nav aids · Irish Sea and St. George's Channellong running0150
Missiles · North Atlantic Oceanlong running0150
Missiles · North Pacific Oceanlong running0150
Surveys · Arctic Oceanlong running0120
Nav aids · Bering Sealong running0120
Exercises · Black Sealong running0120
Other · Caribbean Sealong running0120
Cable ops · Celtic Sealong running0120
Nav aids · English Channellong running0120
Cable ops · Indian Oceanlong running0120
Exercises · Philippine Sea0120
Surveys · Sea of Okhotsk0120
Surveys · Timor Sealong running0120
Nav aids · Bay of Biscaylong running090
Ordnance · Bay of Biscaylong running090
Surveys · Black Sealong running090
Spills · Caribbean Sealong running090
Exercises · Gulf of Californialong running090
Nav aids · Gulf of Omanlong running090
Nav aids · Hudson Straitlong running090
Nav aids · Indian Oceanlong running090
Exercises · Japan Sea090
Nav aids · Laccadive Sealong running090
Exercises · North Atlantic Oceanlong running090
Other · North Atlantic Oceanlong running090
Wrecks · North Pacific Oceanlong running090
Nav aids · Persian Gulflong running090
Other · Persian Gulflong running090
Cable ops · Philippine Sealong running090
Nav aids · Philippine Sealong running090
Exercises · South China Sea090
Nav aids · Arafura Sealong running060
Wrecks · Bay of Bengallong running060
Other · Bay of Biscaylong running060
Surveys · Bay of Biscaylong running060
Surveys · Bering Sea060
War risk · Black Sealong running060
Exercises · Caribbean Sealong running060
Surveys · Caribbean Sealong running060
Surveys · Chukchi Sealong running060
Wrecks · Coral Sealong running060
Surveys · Gulf of Mexicolong running060
Exercises · Indian Ocean060
Other · Indian Oceanlong running060
Surveys · Irish Sea and St. George's Channellong running060
Surveys · Kara Sealong running060
Wrecks · Kara Sealong running060
Nav aids · Mediterranean Sea - Eastern Basinlong running060
Debris · North Pacific Ocean060
Other · North Pacific Oceanlong running060
Towing · North Pacific Oceanlong running060
Volcanic · North Pacific Oceanlong running060
Nav aids · North Sealong running060
Piracy · South China Sea060
Spills · South Pacific Ocean060
Cable ops · Sulu Sealong running060
Exercises · Andaman or Burma Sea030
Wrecks · Arafura Sealong running030
Nav aids · Arctic Oceanlong running030
Derelicts · Bass Straitlong running030
Surveys · Bass Straitlong running030
Wrecks · Bass Strait030
Other · Bay of Bengallong running030
Debris · Bay of Biscaylong running030
Wrecks · Bay of Biscaylong running030
Other · Beaufort Sealong running030
Surveys · Beaufort Sealong running030
Cable ops · Black Sea030
Nav aids · Black Sealong running030
Other · Black Sealong running030
Cable ops · Caribbean Sealong running030
Derelicts · Caribbean Sealong running030
Surveys · Celtic Sealong running030
Quakes · Coral Sealong running030
Wrecks · Eastern China Sealong running030
Wrecks · English Channellong running030
Nav aids · Great Australian Bight030
Nav aids · Gulf of Californialong running030
Cable ops · Gulf of Guinealong running030
Exercises · Gulf of Mexicolong running030
Storms · Gulf of Mexicolong running030
Wrecks · Gulf of Mexicolong running030
Derelicts · Gulf of Oman030
Wrecks · Gulf of Suezlong running030
Nav aids · Hudson Baylong running030
Wrecks · Hudson Baylong running030
Wrecks · Hudson Strait030
Restricted · Indian Oceanlong running030
Wrecks · Indian Ocean030
Nav aids · Inner Seas off the West Coast of Scotlandlong running030
Exercises · Irish Sea and St. George's Channellong running030
Other · Irish Sea and St. George's Channellong running030
Wrecks · Irish Sea and St. George's Channellong running030
Cable ops · Java Sealong running030
Icebergs · Labrador Sealong running030
Containers · Laccadive Sea030
Missiles · Laccadive Sea030
Surveys · Laccadive Sealong running030
Wrecks · Laccadive Sealong running030
Cable ops · Ligurian Sealong running030
Other · Mediterranean Sea - Eastern Basinlong running030
Surveys · Mediterranean Sea - Eastern Basinlong running030
Cable ops · Mediterranean Sea - Western Basinlong running030
Surveys · Mediterranean Sea - Western Basinlong running030
Structures · Mozambique Channellong running030
Derelicts · North Atlantic Oceanlong running030
Structures · North Pacific Ocean030
Other · North Sealong running030
Surveys · Norwegian Sealong running030
Exercises · Persian Gulf030
Structures · Persian Gulf030
Missiles · Philippine Sea030
Surveys · Philippine Sea030
Derelicts · Red Sea030
Incidents · Red Sea030
Nav aids · Sea of Okhotsk030
Piracy · Singapore Strait030
Exercises · South Atlantic Oceanlong running030
Icebergs · South Atlantic Oceanlong running030
Cable ops · South China Sealong running030
Surveys · South China Sealong running030
Cable ops · South Pacific Oceanlong running030
Nav aids · Tasman Sealong running030
Nav aids · The Coastal Waters of Southeast Alaska and British Columbialong running030
Nav aids · The Northwestern Passageslong running030
Debris · Timor Sea030

Cite: seahazards.com Sea Ledger, 2025-11, 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.

Sea Ledger, November 2025 — warnings by sea and type · seahazards