Exercises

Gunnery exercises 222100Z to 252100Z dec in area bound by 42-30N 131-00E, 42-30N 131-30E, 42-20N 131-30E,…

Japan Sea · HYDROPAC 3762/20

What this record establishes

Archived notice · 2020-12-25 22:00Z

This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.

Source and dates: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · VLADIVOSTOK 245/20 200550Z DEC 20.. Issued 2020-12-20 09:05Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered: Japan Sea. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Current notices and reporting history in the Japan Sea →

Activity windows · 1 in this warning

opens (UTC)	closes (UTC)	local	length
2020-12-22 21:00Z	2020-12-25 21:00Z	—	72 h

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued: 2020-12-20 09:05Z
status: Archived notice
self-cancels: 2020-12-25 22:00Z
authority: VLADIVOSTOK 245/20 200550Z DEC 20.
issued by: VLADIVOSTOK
sea: Japan Sea
position: 42.417, 131.250
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SEA OF JAPAN.
RUSSIA.
DNC 23.
1. GUNNERY EXERCISES 222100Z TO 252100Z DEC
   IN AREA BOUND BY
   42-30N 131-00E, 42-30N 131-30E,
   42-20N 131-30E, 42-20N 131-00E.
2. CANCEL THIS MSG 252200Z DEC 20.

Reading this warning

DNC (Digital Nautical Chart): A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
Gunnery and live firing: Naval or coastal guns firing into a sea area for practice, at stated times.
Date-time group (DTG): A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Area bound by: Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
Position (degrees and minutes): How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
CANCEL THIS MSG: The warning's own expiry: a line telling the reader when the message cancels itself.

All warning terms →

Collected reports in this area · military exercises

238 within 180 nm since 1999 · 3 in the last 12 months · 0 listed in force now

Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.

Month of issue in the collected archive

All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.

Nearby notices listed in force · within 120 nm

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

31 military exercises listed in force · see all

Record snapshot 2026-09-30 04:51Z; source collection times vary.

Exercises

Gunnery, firing and naval exercise areas. All current military exercises →

Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.