Sea Ledger, August 2025

2025-08-01 to 2025-08-31 · gap

issued
68
warning-days in force
18,898
in force at month end
613
sea × type cells
185

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
Quakes48227.54
Spills1538916
Nav aids37,079.2230
Wrecks22,150.671
Other068222
Mines01555
Surveys03,00797
Exercises01,89161
Restricted01244
Cable ops01,20939
Incidents0933
Missiles058919
Icebergs0622
Piracy0933
Derelicts01555
Towing0622
Structures0622
Debris01244
War risk0622
Storms0311
Volcanic052717
Ordnance0933
Containers0311

By sea and type · 185 cells, most issued first

cellissuedwarning-daysvs 5 y
Quakes · North Pacific Ocean26132.1
Quakes · South Pacific Ocean1134.5
Spills · Gulf of Mexico671
Spills · North Pacific Ocean448
Spills · The Coastal Waters of Southeast Alaska and British Columbia350
Quakes · Coral Sealong running235.2
Nav aids · Caribbean Sealong running11,883.9
Nav aids · North Atlantic Oceanlong running1821.3
Wrecks · Arabian Sealong running1258.6
Wrecks · The Northwestern Passageslong running1187
Nav aids · Beaufort Sealong running196
Spills · North Atlantic Oceanlong running144
Spills · Gulf of Alaska121
Quakes · Bering Sea13
Quakes · Caribbean Sea13
Quakes · Eastern China Sea13
Quakes · Gulf of Tomini13
Quakes · Indian Ocean13
Quakes · Molukka Sea13
Quakes · Philippine Sea13
Quakes · Southern Ocean13
Quakes · South Atlantic Ocean11.7
Exercises · North Pacific Ocean0558
Nav aids · South Pacific Oceanlong running0527
Nav aids · South Atlantic Oceanlong running0496
Volcanic · Philippine Sealong running0465
Surveys · Indian Oceanlong running0434
Nav aids · North Pacific Oceanlong running0403
Nav aids · Gulf of Mexicolong running0372
Exercises · Bay of Bengal0341
Surveys · South Atlantic Oceanlong running0279
Surveys · Persian Gulflong running0248
Wrecks · South Atlantic Oceanlong running0248
Nav aids · South China Sealong running0248
Nav aids · Arabian Sealong running0217
Cable ops · North Atlantic Oceanlong running0217
Surveys · North Atlantic Oceanlong running0217
Wrecks · Persian Gulflong running0217
Surveys · The Northwestern Passageslong running0217
Nav aids · Celtic Sealong running0186
Wrecks · North Atlantic Oceanlong running0186
Surveys · South Pacific Oceanlong running0186
Surveys · Arabian Sea0155
Mines · Black Sealong running0155
Wrecks · Caribbean Sealong running0155
Nav aids · Irish Sea and St. George's Channellong running0155
Missiles · North Atlantic Oceanlong running0155
Missiles · North Pacific Oceanlong running0155
Cable ops · Persian Gulflong running0155
Missiles · South Pacific Ocean0155
Wrecks · South Pacific Oceanlong running0155
Surveys · Arctic Oceanlong running0124
Nav aids · Bering Sealong running0124
Exercises · Black Sealong running0124
Other · Caribbean Sealong running0124
Cable ops · Celtic Sealong running0124
Nav aids · Coral Sealong running0124
Nav aids · English Channellong running0124
Cable ops · Indian Oceanlong running0124
Exercises · Philippine Sea0124
Surveys · Sea of Okhotsk0124
Wrecks · South China Sealong running0124
Surveys · Timor Sealong running0124
Nav aids · Andaman or Burma Sealong running093
Cable ops · Arabian Sea093
Nav aids · Bay of Biscaylong running093
Ordnance · Bay of Biscaylong running093
Surveys · Black Sealong running093
Spills · Caribbean Sealong running093
Nav aids · Gulf of Alaskalong running093
Exercises · Gulf of California093
Nav aids · Hudson Straitlong running093
Nav aids · Indian Oceanlong running093
Exercises · Japan Sea093
Nav aids · Laccadive Sealong running093
Exercises · North Atlantic Oceanlong running093
Other · North Atlantic Oceanlong running093
Wrecks · North Pacific Oceanlong running093
Other · Persian Gulflong running093
Restricted · Persian Gulf093
Cable ops · Philippine Sealong running093
Nav aids · Philippine Sealong running093
Exercises · South China Sea093
Exercises · Arabian Sea062
Nav aids · Arafura Sealong running062
Nav aids · Bay of Bengal062
Surveys · Bay of Bengal062
Wrecks · Bay of Bengallong running062
Other · Bay of Biscaylong running062
Surveys · Bay of Biscaylong running062
Surveys · Bering Sea062
War risk · Black Sealong running062
Exercises · Caribbean Sealong running062
Surveys · Caribbean Sealong running062
Surveys · Chukchi Sealong running062
Wrecks · Coral Sealong running062
Surveys · Gulf of Mexicolong running062
Nav aids · Gulf of Omanlong running062
Exercises · Indian Ocean062
Missiles · Indian Ocean062
Other · Indian Oceanlong running062
Surveys · Irish Sea and St. George's Channellong running062
Surveys · Kara Sealong running062
Wrecks · Kara Sealong running062
Nav aids · Mediterranean Sea - Eastern Basinlong running062
Cable ops · North Pacific Ocean062
Debris · North Pacific Ocean062
Other · North Pacific Oceanlong running062
Towing · North Pacific Oceanlong running062
Volcanic · North Pacific Oceanlong running062
Nav aids · North Sealong running062
Nav aids · Persian Gulflong running062
Cable ops · South Atlantic Ocean062
Piracy · South China Sea062
Spills · South Pacific Ocean062
Cable ops · Sulu Sealong running062
Exercises · Andaman or Burma Sea031
Wrecks · Arafura Sealong running031
Nav aids · Arctic Oceanlong running031
Derelicts · Bass Straitlong running031
Surveys · Bass Straitlong running031
Wrecks · Bass Strait031
Other · Bay of Bengallong running031
Debris · Bay of Biscaylong running031
Wrecks · Bay of Biscaylong running031
Other · Beaufort Sealong running031
Surveys · Beaufort Sealong running031
Nav aids · Black Sea031
Other · Black Sealong running031
Cable ops · Caribbean Sealong running031
Derelicts · Caribbean Sealong running031
Surveys · Celtic Sealong running031
Wrecks · Eastern China Sealong running031
Wrecks · English Channellong running031
Nav aids · Gulf of Californialong running031
Cable ops · Gulf of Guinealong running031
Exercises · Gulf of Mexicolong running031
Storms · Gulf of Mexico031
Wrecks · Gulf of Mexicolong running031
Derelicts · Gulf of Oman031
Wrecks · Gulf of Suezlong running031
Incidents · Gulf of Thailand031
Nav aids · Hudson Baylong running031
Wrecks · Hudson Baylong running031
Restricted · Indian Oceanlong running031
Wrecks · Indian Ocean031
Nav aids · Inner Seas off the West Coast of Scotland031
Exercises · Irish Sea and St. George's Channel031
Other · Irish Sea and St. George's Channellong running031
Wrecks · Irish Sea and St. George's Channellong running031
Cable ops · Java Sealong running031
Icebergs · Labrador Sea031
Containers · Laccadive Sea031
Exercises · Laccadive Sea031
Missiles · Laccadive Sea031
Incidents · Laccadive Sea031
Surveys · Laccadive Sealong running031
Wrecks · Laccadive Sealong running031
Cable ops · Ligurian Sealong running031
Other · Mediterranean Sea - Eastern Basinlong running031
Surveys · Mediterranean Sea - Eastern Basinlong running031
Cable ops · Mediterranean Sea - Western Basinlong running031
Surveys · Mediterranean Sea - Western Basin031
Structures · Mozambique Channellong running031
Derelicts · North Atlantic Oceanlong running031
Other · North Sea031
Surveys · Norwegian Sealong running031
Exercises · Persian Gulf031
Structures · Persian Gulf031
Missiles · Philippine Sea031
Surveys · Philippine Sea031
Derelicts · Red Sea031
Incidents · Red Sea031
Nav aids · Sea of Okhotsk031
Piracy · Singapore Strait031
Exercises · South Atlantic Ocean031
Icebergs · South Atlantic Ocean031
Cable ops · South China Sealong running031
Surveys · South China Sealong running031
Cable ops · South Pacific Ocean031
Nav aids · Tasman Sealong running031
Surveys · Tasman Sealong running031
Nav aids · The Coastal Waters of Southeast Alaska and British Columbialong running031
Nav aids · The Northwestern Passageslong running031
Debris · Timor Sea031

Cite: seahazards.com Sea Ledger, 2025-08, 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, August 2025 — warnings by sea and type · seahazards