Sea Ledger, May 2026

2026-05-01 to 2026-05-31 · gap

issued
65
warning-days in force
20,659
in force at month end
676
sea × type cells
195

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
Quakes36136.83
Spills1129710
Nav aids98,262270
Surveys53,041.1102
Wrecks22,68788
Other193231
Cable ops11,706.956
Mines01555
Exercises01,58151
Restricted01244
Missiles052717
Storms0622
Icebergs0622
Derelicts01866
Towing0622
Structures0622
Debris0933
War risk0622
Volcanic052717
Ordnance0933

By sea and type · 195 cells, most issued first

cellissuedwarning-daysvs 5 y
Quakes · South Pacific Ocean718.1
Spills · North Pacific Ocean660
Quakes · Indian Ocean515
Quakes · North Pacific Ocean515
Quakes · Philippine Sea515
Nav aids · South Atlantic Oceanlong running4901.2
Spills · Gulf of Mexico481
Nav aids · Caribbean Sealong running22,172.4
Surveys · South Atlantic Oceanlong running2356.1
Quakes · Coral Sealong running237
Wrecks · Gulf of Guinea221
Quakes · Bismarck Sea28.6
Quakes · Bering Sea26
Quakes · Molukka Sea26
Quakes · North Atlantic Ocean24.1
Nav aids · North Atlantic Oceanlong running1988.4
Nav aids · South Pacific Oceanlong running1631.1
Surveys · North Atlantic Oceanlong running1315.5
Surveys · Timor Sealong running165.9
Spills · North Atlantic Oceanlong running157
Surveys · Sea of Okhotsk140.6
Nav aids · Timor Sea13.9
Quakes · Banda Sea13
Quakes · Eastern China Sea13
Quakes · Solomon Sea13
Quakes · South Atlantic Ocean13
Other · Great Australian Bight12
Cable ops · Great Australian Bight11.9
Exercises · North Pacific Oceanlong running0496
Cable ops · Arabian Sea0465
Surveys · Indian Oceanlong running0465
Volcanic · Philippine Sealong running0465
Nav aids · North Pacific Oceanlong running0434
Nav aids · Gulf of Mexicolong running0372
Wrecks · Arabian Sealong running0341
Wrecks · Persian Gulflong running0279
Wrecks · South Atlantic Oceanlong running0279
Wrecks · The Northwestern Passageslong running0279
Wrecks · Caribbean Sealong running0248
Cable ops · North Atlantic Oceanlong running0248
Wrecks · North Atlantic Oceanlong running0248
Surveys · The Northwestern Passageslong running0217
Exercises · Bay of Bengal0186
Nav aids · Celtic Sealong running0186
Nav aids · South China Sealong running0186
Surveys · Arabian Sea0155
Nav aids · Beaufort Sealong running0155
Nav aids · Bering Sealong running0155
Mines · Black Sealong running0155
Nav aids · Indian Oceanlong running0155
Nav aids · Irish Sea and St. George's Channellong running0155
Missiles · North Atlantic Oceanlong running0155
Cable ops · Persian Gulflong running0155
Nav aids · Persian Gulflong running0155
Surveys · Persian Gulflong running0155
Wrecks · South China Sealong running0155
Surveys · South Pacific Oceanlong running0155
Nav aids · Andaman or Burma Sealong running0124
Exercises · Arabian Sea0124
Nav aids · Arabian Sealong running0124
Surveys · Arctic Oceanlong running0124
Exercises · Black Sealong running0124
Surveys · Black Sealong running0124
Other · Caribbean Sealong running0124
Cable ops · Celtic Sealong running0124
Nav aids · English Channellong running0124
Nav aids · Gulf of Alaskalong running0124
Other · Indian Oceanlong running0124
Other · North Atlantic Oceanlong running0124
Missiles · North Pacific Oceanlong running0124
Missiles · South Pacific Oceanlong running0124
Nav aids · Bay of Biscaylong running093
Ordnance · Bay of Biscaylong running093
Spills · Caribbean Sealong running093
Nav aids · Coral Sealong running093
Exercises · Gulf of Californialong running093
Nav aids · Hudson Straitlong running093
Cable ops · Indian Oceanlong running093
Nav aids · Laccadive Sealong running093
Wrecks · Laccadive Sealong running093
Exercises · North Atlantic Oceanlong running093
Other · North Pacific Oceanlong running093
Wrecks · North Pacific Oceanlong running093
Other · Persian Gulflong running093
Cable ops · Philippine Sealong running093
Exercises · Philippine Sea093
Nav aids · Philippine Sealong running093
Wrecks · South Pacific Oceanlong running093
Exercises · Aegean Sea062
Nav aids · Arafura Sealong running062
Surveys · Bass Straitlong running062
Nav aids · 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
Wrecks · Gulf of Mexicolong running062
Nav aids · Gulf of Omanlong running062
Missiles · Indian Ocean062
Surveys · Irish Sea and St. George's Channellong running062
Surveys · Kara Sealong running062
Wrecks · Kara Sealong running062
Nav aids · Mediterranean Sea - Eastern Basinlong running062
Debris · North Pacific Ocean062
Towing · North Pacific Oceanlong running062
Volcanic · North Pacific Oceanlong running062
Nav aids · North Sealong running062
Restricted · Persian Gulflong running062
Cable ops · South Atlantic Oceanlong running062
Cable ops · South Pacific Oceanlong running062
Cable ops · Sulu Sealong running062
Exercises · Tasman Sea062
Nav aids · Tasman Sealong running062
Other · Adriatic Sea031
Missiles · Aegean Sea031
Exercises · Andaman or Burma Sea031
Surveys · Andaman or Burma Sea031
Other · Arabian Sea031
Wrecks · Arafura Sealong running031
Nav aids · Arctic Oceanlong running031
Cable ops · Bass Strait031
Derelicts · Bass Straitlong running031
Wrecks · Bass Strait031
Other · Bay of Bengallong running031
Surveys · Bay of Bengal031
Debris · Bay of Biscaylong running031
Wrecks · Bay of Biscaylong running031
Other · Beaufort Sealong running031
Surveys · Beaufort Sealong running031
Cable ops · Black Sea031
Nav aids · Black Sealong running031
Other · Black Sealong running031
Cable ops · Caribbean Sealong running031
Derelicts · Caribbean Sealong running031
Surveys · Celtic Sealong running031
Other · Davis Strait031
Wrecks · Eastern China Sealong running031
Wrecks · English Channellong running031
Nav aids · Great Australian Bight031
Wrecks · Great Australian Bight031
Nav aids · Gulf of Californialong running031
Cable ops · Gulf of Guinealong running031
Exercises · Gulf of Mexicolong running031
Storms · Gulf of Mexicolong running031
Derelicts · Gulf of Oman031
Wrecks · Gulf of Suezlong running031
Nav aids · Hudson Baylong running031
Wrecks · Hudson Baylong running031
Wrecks · Hudson Strait031
Derelicts · Indian Ocean031
Restricted · Indian Oceanlong running031
Nav aids · Inner Seas off the West Coast of Scotlandlong running031
Exercises · Irish Sea and St. George's Channellong running031
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 Sealong running031
Exercises · Laccadive Sea031
Missiles · Laccadive Sea031
Surveys · Laccadive Sealong running031
Cable ops · Ligurian Sealong running031
Cable ops · Makassar Strait031
Surveys · Makassar Strait031
Surveys · Malacca Strait031
Other · Mediterranean Sea - Eastern Basinlong running031
Surveys · Mediterranean Sea - Eastern Basinlong running031
Cable ops · Mediterranean Sea - Western Basinlong running031
Surveys · Mediterranean Sea - Western Basinlong running031
Restricted · Mozambique Channel031
Structures · Mozambique Channellong running031
Derelicts · North Atlantic Oceanlong running031
Cable ops · North Pacific Oceanlong running031
Structures · North Pacific Ocean031
Other · North Sealong running031
Surveys · Norwegian Sealong running031
Storms · Philippine Sea031
Derelicts · Red Sealong running031
Nav aids · Sea of Okhotsklong running031
Exercises · South Atlantic Oceanlong running031
Icebergs · South Atlantic Oceanlong running031
Cable ops · South China Sealong running031
Surveys · South China Sealong running031
Exercises · South Pacific Ocean031
Other · South Pacific Ocean031
Cable ops · Tasman Sea031
Surveys · Tasman Sealong running031
Nav aids · The Coastal Waters of Southeast Alaska and British Columbialong running031
Nav aids · The Northwestern Passageslong running031
Spills · Philippine Sea06

Cite: seahazards.com Sea Ledger, 2026-05, 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, May 2026 — warnings by sea and type · seahazards