Hazardous operations 1600Z to 1000Z commencing daily 09 thru 14 jul, alternate 1600Z to 1000Z commencing…
Eastern China Sea · HYDROPAC 1921/12
What this record establishes
Archived notice · 2012-07-20 11:00Z
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 446/12 061125Z JUL 12.. Issued 2012-07-06 13:44Z. 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 · 11 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2012-07-09 16:00Z | 2012-07-10 10:00Z | — | 18 h |
| 2012-07-10 16:00Z | 2012-07-11 10:00Z | — | 18 h |
| 2012-07-11 16:00Z | 2012-07-12 10:00Z | — | 18 h |
| 2012-07-12 16:00Z | 2012-07-13 10:00Z | — | 18 h |
| 2012-07-13 16:00Z | 2012-07-14 10:00Z | — | 18 h |
| 2012-07-14 16:00Z | 2012-07-15 10:00Z | — | 18 h |
| 2012-07-15 16:00Z | 2012-07-16 10:00Z | — | 18 h |
| 2012-07-16 16:00Z | 2012-07-17 10:00Z | — | 18 h |
| … 3 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2012-07-06 13:44Z
- status
- Archived notice
- self-cancels
- 2012-07-20 11:00Z
- authority
- NAVAREA XI 446/12 061125Z JUL 12.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Eastern China Sea
- position
- 29.356, 122.983
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EAST CHINA SEA. HAZARDOUS OPERATION. 1. HAZARDOUS OPERATIONS 1600Z TO 1000Z COMMENCING DAILY 09 THRU 14 JUL, ALTERNATE 1600Z TO 1000Z COMMENCING DAILY 15 THRU 19 JUL IN AREA BOUND BY 30-05N 122-25E, 30-05N 123-40E, 28-40N 123-40E, 28-40N 122-13E, 28-52N 122-13E. 2. CANCEL THIS MSG 201100Z JUL.
Reading this warning
- 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.
- 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.
- 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.
Collected reports in this area · military exercises
5 within 180 nm since 2011 · 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
- Large buoy reported to exist in 31-00N 124-00EWrecks · 111.9 nm
Worldwide in the collected sources
9 military exercises listed in force · see all
Record snapshot 2026-10-02 20:51Z; 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.