Hazardous operations
North Pacific Ocean · NAVAREA XII 188/10
What this record establishes
Archived notice · 2010-04-23 00:08Z
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) · WESTERN RANGE OP W0979 211435Z APR 10.. Issued 2010-04-21 14:49Z. 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
- North Pacific Ocean. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Hazardous operationscancelled by this notice
- Hazardous operationslater cancellation notice
Current notices and reporting history in the North Pacific Ocean →
Activity windows · 6 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2010-04-22 18:30Z | 2010-04-23 02:00Z | — | 7 h 30 |
| 2010-04-23 18:30Z | 2010-04-24 02:00Z | — | 7 h 30 |
| 2010-04-24 18:30Z | 2010-04-25 02:00Z | — | 7 h 30 |
| 2010-04-25 18:30Z | 2010-04-26 02:00Z | — | 7 h 30 |
| 2010-04-26 18:30Z | 2010-04-27 02:00Z | — | 7 h 30 |
| 2010-04-27 18:30Z | 2010-04-28 02:00Z | — | 7 h 30 |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2010-04-21 14:49Z
- status
- Archived notice
- self-cancels
- 2010-04-28 03:00Z
- authority
- WESTERN RANGE OP W0979 211435Z APR 10.
- NAVAREA
- NAVAREA XII
- issued by
- WESTERN RANGE OP
- sea
- North Pacific Ocean
- position
- 30.151, -150.379
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH PACIFIC.
HAZARDOUS OPERATIONS.
1. HAZARDOUS OPERATIONS 1830Z TO 0200Z COMMENCING
DAILY 22 THRU 27 APR IN AREAS BOUND BY:
A. 34-38N 120-56W, 34-39N 120-56W,
34-35N 120-38W, 34-34N 120-38W.
B. 35-14N 123-10W, 34-50N 121-14W,
34-36N 121-20W, 35-00N 123-16W.
C. 36-05N 128-58W, 35-45N 126-44W,
35-38N 126-46W, 35-59N 129-02W.
D. 27-24N 157-07W, 28-46N 157-56W,
32-33N 145-40W, 31-12N 144-59W,
30-55N 145-22W.
2. CANCEL NAVAREA XII 184/10.
3. CANCEL THIS MSG 280300Z APR.
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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- NAVAREA
- One of the 21 ocean areas of the World-Wide Navigational Warning Service, each with a coordinator that broadcasts long-range warnings.
- 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
12 within 180 nm since 2001 · 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.
- Hazardous operations: a. 1830Z to 2349Z daily 30 may thru 01 jun in area bound by 34-40N 124-10W, 34-59N…2017-05-25
- Hazardous operations2016-01-27
- Hazardous operations2016-01-23
- Hazardous operations2010-04-19
- Hazardous operations2010-04-16
- Gunnery exercises 261600Z to 262000Z mar within six miles of 30-06.4N 153-09.1W2009-03-25
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
9 military exercises listed in force · see all
Record snapshot 2026-10-02 17:07Z; 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.