Hazardous operations 1845Z to 2359Z daily 03 thru 07 and 10 apr in areas bound by: a. 34-37.00N 121-24.00W,…
North Pacific Ocean · NAVAREA XII 166/23
What this record establishes
Archived notice · 2023-04-03 21:47Z
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 6555/23 282049Z MAR 23.. Issued 2023-03-30 03:09Z. 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 operations 051845Z to 052359Z apr, alternate 061845Z to 062359Z apr in areas bound by: a.…later cancellation notice
Current notices and reporting history in the North Pacific Ocean →
Activity windows · 5 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2023-04-03 18:45Z | 2023-04-03 23:59Z | — | 5 h 14 |
| 2023-04-04 18:45Z | 2023-04-04 23:59Z | — | 5 h 14 |
| 2023-04-05 18:45Z | 2023-04-05 23:59Z | — | 5 h 14 |
| 2023-04-06 18:45Z | 2023-04-06 23:59Z | — | 5 h 14 |
| 2023-04-07 18:45Z | 2023-04-07 23:59Z | — | 5 h 14 |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2023-03-30 03:09Z
- status
- Archived notice
- self-cancels
- 2023-04-11 00:59Z
- authority
- WESTERN RANGE 6555/23 282049Z MAR 23.
- NAVAREA
- NAVAREA XII
- issued by
- WESTERN RANGE
- sea
- North Pacific Ocean
- position
- 21.867, -134.873
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH PACIFIC.
CALIFORNIA.
1. HAZARDOUS OPERATIONS 1845Z TO 2359Z DAILY
03 THRU 07 AND 10 APR IN AREAS BOUND BY:
A. 34-37.00N 121-24.00W, 34-40.00N 122-13.00W,
34-02.00N 122-58.00W, 32-12.00N 125-14.00W,
31-34.00N 125-29.00W, 31-04.00N 124-45.00W,
31-26.00N 124-07.00W, 34-02.00N 121-13.00W.
B. 23-17.00N 135-50.00W, 21-37.00N 137-03.00W,
19-58.00N 133-59.00W, 22-07.00N 132-44.00W.
2. CANCEL THIS MSG 110059Z APR 23.
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
13 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.
- Hazardous operations 051845Z to 052359Z apr, alternate 061845Z to 062359Z apr in areas bound by: a.…2023-04-03
- Hazardous operations 271730Z to 280042Z oct, alternate 281730Z to 290042Z in areas bound by: a. 34-37.00N…2022-10-26
- Hazardous operations 261730Z to 270042Z oct, alternate 1730Z to 0042Z daily 27 and 28 oct in areas bound by:…2022-10-25
- Hazardous operations 251730Z to 260042Z oct, alternate 1730Z to 0042Z daily 26 thru 28 oct in areas bound…2022-10-23
- Hazardous operations 241730Z to 250042Z oct, alternate 1730Z to 0042Z daily 25 thru 28 oct in areas bound…2022-10-19
- Hazardous operations2010-09-16
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
9 military exercises listed in force · see all
Record snapshot 2026-10-03 02:04Z; 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.