Hazardous operations 160100Z to 160700Z apr in area bound by 26-56.40N 122-22.08E, 26-32.94N 121-57.06E,…
Eastern China Sea · HYDROPAC 1230/23
What this record establishes
Archived notice · 2023-04-16 08:00Z
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 131/23 140000Z APR 23.. Issued 2023-04-14 01:56Z. 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
- Eastern China 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 Eastern China Sea →
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2023-04-16 01:00Z | 2023-04-16 07:00Z | — | 6 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2023-04-14 01:56Z
- status
- Archived notice
- self-cancels
- 2023-04-16 08:00Z
- authority
- NAVAREA XI 131/23 140000Z APR 23.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Eastern China Sea
- position
- 26.322, 122.646
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EAST CHINA SEA. JAPAN. DNC 23. 1. HAZARDOUS OPERATIONS 160100Z TO 160700Z APR IN AREA BOUND BY 26-56.40N 122-22.08E, 26-32.94N 121-57.06E, 25-42.30N 122-55.50E, 26-05.58N 123-20.52E. 2. CANCEL THIS MSG 160800Z APR 23.
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.
- Hazardous operations
- NGA's heading for activities that make an area dangerous — most often rocket launches, space debris and weapons firings, and some open-ended danger areas.
- 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
294 within 180 nm since 1999 · 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 in progress until 070400Z aug in area bound by 25-03.00N 122-11.00E, 25-34.00N 122-11.00E,…2022-08-05
- Hazardous operations in progress until 080200Z aug in area bound by 23-13.00N 122-30.00E, 23-40.00N…2022-08-04
- Gunnery exercises 1900Z to 0300Z daily 28, 29 jun, 05 thru 07, 11 thru 14, 19, 20 and 25 jul, and 0100Z to…2022-06-24
- Gunnery exercises 2330Z to 0001Z commencing daily 30 apr, 07, 14, 21 and 28 may 0035Z to 0045Z and 0100Z to…2019-04-26
- Gunnery exercises 0230Z to 0310Z daily 01, 08, 15, 22 and 29 may in area bound by 24-44-39N 122-18-51E,…2019-04-26
- Gunnery exercises 0230Z to 0310Z daily 16 and 17 apr in area bound by 24-44-39N 122-18-51E, 23-44-06N…2019-04-16
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 23:33Z; 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.