NAVAREA XI
Coordinated by Japan (Japan Coast Guard (Hydrographic and Oceanographic Department)); covers the north-west Pacific and East Asian seas, from Japan to the South China Sea.
NAVAREA XI covers the seas of East Asia: the waters around Japan, the Yellow, East China and South China Seas and the western Pacific. The Japan Coast Guard coordinates it. Rocket launches from China and Japan, volcanic activity south of Japan and heavy survey and exercise activity make it one of the busiest areas in the world.
The in-force list is collected directly from the Japan Coast Guard; older warnings come from NGA HYDROPAC relays.
- own list read
- Japan Coast Guard
- attributed by
- own series 78 · named in an NGA relay 10,271
What the archive shows
10,349 warnings in this archive are attributed to NAVAREA XI, issued from 1999-05-14 to 2026-09-24. 34 of them are in force in the latest lists we collected.
78 come from the area's own series and 10,271 are NGA relays that name NAVAREA XI as their source.
Exercises accounts for 4,948 of 10,349 recorded messages (48%), the largest warning type group in this selection.
The stations and services named as originators most often are JAPAN COAST GUARD (79), AUSCOAST (9), CTG (3) and AUSSAR (2), among 47 in all.
The largest yearly count is 2010, with 746 warnings. Collection is incomplete between 2024-05 and 2026-08-17, so those years are not comparable.
They reached this archive through HYDROPAC (10,268), NAVAREA XI (78), HYDROLANT (2) and HYDROARC (1).
Attributed warnings by year of issue
By month of issue, all years
Warning types
Originating stations and services · 47
The authority recorded with each message: the range, rescue centre, coast radio station or national service that issued it.
- JAPAN COAST GUARD79
- AUSCOAST9
- CTG3
- AUSSAR2
- COMCOGARD SECTOR GUAM2
- GUAMSARCOORD2
- MENAS2
- MENAS BAHRAIN2
- MPA SINGAPORE POR EGC2
- AUTHROITY/NAVAREA XI1
- JRCC HONOLULU1
- MRCC NOUMEA1
Where they lie · 40 sea areas
- Yellow Sea 1,495
- South China Sea 1,438
- North Pacific Ocean 1,217
- Philippine Sea 1,156
- Japan Sea 697
- Eastern China Sea 268
- Indian Ocean 166
- Malacca Strait 153
- Singapore Strait 122
- Sulu Sea 76
- Timor Sea 74
- Java Sea 68
Newest in force · 34
- NAVAREA XI 426/26 · Cable ops · South China Sea2026-09-24 · JAPAN COAST GUARDSubmarine pipeline works by M/V fortitude
- NAVAREA XI 425/26 · Missiles2026-09-23 · JAPAN COAST GUARDSpace debris
- NAVAREA XI 424/26 · Derelicts · South China Sea2026-09-22 · JAPAN COAST GUARDAbandoned vessel, M/V msc hermes 3, 213 metre long, adrift in vicinity of 11-45N 112-15E on 220820Z sep
- NAVAREA XI 423/26 · Cable ops · Singapore Strait2026-09-22 · JAPAN COAST GUARDSubmarine cable repairing works by c/v peter faber, 23 sep to until further notice
- NAVAREA XI 414/26 · Piracy · South China Sea2026-09-17 · JAPAN COAST GUARDArmed robbery information
- NAVAREA XI 408/26 · Wrecks · Java Sea2026-09-13 · JAPAN COAST GUARDSunken wreck, exists in 04-32-31.8S 114-01-36.0E
In force the longest
- NAVAREA XI 132/19 · Wrecks · South China Sea2019-03-07 · JAPAN COAST GUARDOil rig reported to exists in 07-47.5N 108-12.0E
- NAVAREA XI 664/19 · Wrecks · South China Sea2019-11-21 · JAPAN COAST GUARDOil rig reported to exists in 07-42.1N 107-55.8E
- NAVAREA XI 153/20 · Wrecks · South China Sea2020-04-06 · JAPAN COAST GUARDYellow observation buoy reported to exists in 19-20.6N 113-45.9E at 04 apr
Most recently issued
- NAVAREA XI 426/26 · Cable ops · South China Sea2026-09-24 · JAPAN COAST GUARDSubmarine pipeline works by M/V fortitude
- NAVAREA XI 425/26 · Missiles2026-09-23 · JAPAN COAST GUARDSpace debris
- NAVAREA XI 424/26 · Derelicts · South China Sea2026-09-22 · JAPAN COAST GUARDAbandoned vessel, M/V msc hermes 3, 213 metre long, adrift in vicinity of 11-45N 112-15E on 220820Z sep
- NAVAREA XI 423/26 · Cable ops · Singapore Strait2026-09-22 · JAPAN COAST GUARDSubmarine cable repairing works by c/v peter faber, 23 sep to until further notice
- NAVAREA XI 422/26 · Missiles · Sulu Sea2026-09-20 · JAPAN COAST GUARDSpace debris
- NAVAREA XI 421/26 · Missiles2026-09-20 · JAPAN COAST GUARDObject potentially ballistic missile launched from north korea possibly landed
- NAVAREA XI 420/26 · Missiles2026-09-20 · JAPAN COAST GUARDObject potentially ballistic missile launched from north korea
- NAVAREA XI 418/26 · Missiles2026-09-20 · JAPAN COAST GUARDObject potentially ballistic missile launched from north korea
Neighbouring areas
- NAVAREA X — the waters around Australia, from the eastern Indian Ocean to the Coral and Tasman Seas
- NAVAREA XII — the eastern North Pacific: North America's west coast, Hawaii and the central Pacific
Counts are warnings attributed to NAVAREA XI by their series or by the source an NGA relay names, recounted 2026-09-24; the area's full traffic is larger. Not for navigation — follow official NAVAREA broadcasts.