Restricted

Navigation prohibited until 152300Z dec in area bound by 43-13-42N 132-18-20E, 43-12-43N 132-19-05E,…

Japan Sea · HYDROPAC 3628/20

What this record establishes

Archived notice · 2020-12-16 00:01Z

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 235/20 081037Z DEC 20.. Issued 2020-12-08 11:04Z. 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 →

issued: 2020-12-08 11:04Z
status: Archived notice
self-cancels: 2020-12-16 00:01Z
authority: VLADIVOSTOK 235/20 081037Z DEC 20.
issued by: VLADIVOSTOK
sea: Japan Sea
position: 43.211, 132.302
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 24.
1. NAVIGATION PROHIBITED UNTIL 152300Z DEC
   IN AREA BOUND BY
   43-13-42N 132-18-20E, 43-12-43N 132-19-05E,
   43-11-31N 132-18-03E, 43-12-45N 132-17-11E.
2. CANCEL THIS MSG 160001Z 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.
Navigation prohibited: Ships may not enter or pass through the area, or a port is closed to traffic.
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 · restricted areas & port closures

9 within 180 nm since 2003 · 0 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

2 restricted areas & port closures listed in force · see all

Record snapshot 2026-10-02 20:13Z; source collection times vary.

Restricted

Navigation prohibited, exclusion and security zones, ports closed to traffic. All current restricted areas & port closures →

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.