Gunnery exercises 0400Z to 0900Z daily 12, 13, 16 and 17 apr and 180800Z to 181300Z apr in area bound by…
Yellow Sea · HYDROPAC 1084/21
What this record establishes
Archived notice · 2021-04-18 14:00Z
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) · NAVAREA XI 119/21 091132Z APR 21.. Issued 2021-04-09 11:37Z. 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
- Yellow 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.
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2021-04-18 08:00Z | 2021-04-18 13:00Z | — | 5 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2021-04-09 11:37Z
- status
- Archived notice
- self-cancels
- 2021-04-18 14:00Z
- authority
- NAVAREA XI 119/21 091132Z APR 21.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Yellow Sea
- position
- 37.458, 124.775
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
YELLOW SEA. DNC 23. 1. GUNNERY EXERCISES 0400Z TO 0900Z DAILY 12, 13, 16 AND 17 APR AND 180800Z TO 181300Z APR IN AREA BOUND BY 37-25N 124-43E, 37-30N 124-43E, 37-30N 124-50E, 37-25N 124-50E. 2. CANCEL THIS MSG 181400Z APR 21.
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.
Collected reports in this area · military exercises
1357 within 180 nm since 2000 · 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.
- Gunnery exercises 290300Z to 290700Z apr in area bound by 37-41-00N 125-39-30E, 37-41-00N 125-41-40E,…2021-04-27
- Gunnery exercises 0400Z to 0900Z daily 26 and 27 apr, 0600Z to 1200Z daily 28 and 29 apr, 300400Z to 300800Z…2021-04-24
- Gunnery exercises 2300Z to 0900Z daily 25 thru 27 apr in area bound by 37-44-55N 124-05-10E, 37-44-55N…2021-04-21
- Gunnery exercises 190800Z to 191300Z apr and 0400Z to 0900Z daily 20, 22, 23, 24 apr and 250600Z to 251200Z…2021-04-16
- Gunnery exercises 142300Z to 151100Z apr in area bound by 37-44-55N 124-05-10E, 37-44-55N 124-36-40E,…2021-04-09
- Gunnery exercises 0400Z to 0900Z daily 05, 06, 09 and 10 apr in area bound by 37-25N 124-43E, 37-30N…2021-04-02
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
28 military exercises listed in force · see all
Record snapshot 2026-10-01 06:45Z; 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.