National warning service · Japan

Japan Coast Guard

Recorded as: JAPAN COAST GUARD

The coordinator of NAVAREA XI, whose Hydrographic and Oceanographic Department issues Japan's navigational warnings.

National warning services and NAVAREA coordinators collect reports of dangers in their waters — from hydrographic surveys, navies, ports and ships — and broadcast them as numbered navigational warnings, some ocean-wide and some coastal.

What the archive holds

1,186 messages in this archive record JAPAN COAST GUARD as their authority, issued from 2000-04-13 to 2026-09-24. 33 of them are in force in the latest lists we collected.

Incidents accounts for 1,007 of 1,186 recorded messages (85%), the largest warning type group in this selection.

Attributed to NAVAREAs, they fall mostly in NAVAREA XI (80) and NAVAREA XII (1).

Located messages lie in 21 sea areas, most often North Pacific Ocean, Philippine Sea and Eastern China Sea.

The largest yearly count is 2018, with 141 messages. Collection is incomplete between 2024-05 and 2026-08-17, so those years are not comparable.

Across all years its messages are issued most often in September and least often in December.

They reached this archive through HYDROPAC (1,106), NAVAREA XI (79) and NAVAREA XII (1).

Messages by year of issue

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'09
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'13
'14
'15
'16
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'24
'25
'26

By month of issue, all years

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Warning types

Where

NAVAREA XI 80 · NAVAREA XII 1

Newest in force · 33

  1. NAVAREA XI 427/26 · Derelicts2026-09-24 · in force
    Drifted abandoned vessel, M/V msc hermes 3, removed
  2. NAVAREA XI 426/26 · Cable ops · South China Sea2026-09-24 · in force
    Submarine pipeline works by M/V fortitude
  3. NAVAREA XI 425/26 · Missiles2026-09-23 · in force
    Space debris
  4. NAVAREA XI 423/26 · Cable ops · Singapore Strait2026-09-22 · in force
    Submarine cable repairing works by c/v peter faber, 23 sep to until further notice
  5. NAVAREA XI 414/26 · Piracy · South China Sea2026-09-17 · in force
    Armed robbery information
  6. NAVAREA XI 408/26 · Wrecks · Java Sea2026-09-13 · in force
    Sunken wreck, exists in 04-32-31.8S 114-01-36.0E

In force the longest

  1. NAVAREA XI 132/19 · Wrecks · South China Sea2019-03-07 · in force
    Oil rig reported to exists in 07-47.5N 108-12.0E
  2. NAVAREA XI 664/19 · Wrecks · South China Sea2019-11-21 · in force
    Oil rig reported to exists in 07-42.1N 107-55.8E
  3. NAVAREA XI 153/20 · Wrecks · South China Sea2020-04-06 · in force
    Yellow observation buoy reported to exists in 19-20.6N 113-45.9E at 04 apr

Most recently issued

  1. NAVAREA XI 424/26 · Derelicts · South China Sea2026-09-22
    Abandoned vessel, M/V msc hermes 3, 213 metre long, adrift in vicinity of 11-45N 112-15E on 220820Z sep
  2. NAVAREA XI 422/26 · Missiles · Sulu Sea2026-09-20
    Space debris
  3. NAVAREA XI 421/26 · Missiles2026-09-20
    Object potentially ballistic missile launched from north korea possibly landed
  4. NAVAREA XI 420/26 · Missiles2026-09-20
    Object potentially ballistic missile launched from north korea

Earliest in the archive

  1. HYDROPAC 566/00 · Incidents · North Pacific Ocean2000-04-13
    Distress signal received on 121.5 mhz in 25-49N 142-40E at 131018Z apr

Other national warning services in NAVAREA XI

Counts are messages recording this issuer as their authority, recounted 2026-09-24; see coverage for what is collected. Not for navigation.