Hazardous operations 171100Z to 171900Z apr, alternate 1300Z to 1900Z daily 18 thru 21 apr in area bound by…
North Pacific Ocean · NAVAREA XII 216/23
What this record establishes
Archived notice · 2023-04-16 01:36Z
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) · JRCC HONOLULU 0/23 151719Z APR 23.. Issued 2023-04-15 18:43Z. 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
- Cancel NAVAREA XII 215/23, 216/23 and this msglater cancellation notice
Current notices and reporting history in the North Pacific Ocean →
Activity windows · 5 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2023-04-17 11:00Z | 2023-04-17 19:00Z | — | 8 h |
| 2023-04-18 13:00Z | 2023-04-18 19:00Z | — | 6 h |
| 2023-04-19 13:00Z | 2023-04-19 19:00Z | — | 6 h |
| 2023-04-20 13:00Z | 2023-04-20 19:00Z | — | 6 h |
| 2023-04-21 13:00Z | 2023-04-21 19:00Z | — | 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
- 2023-04-15 18:43Z
- status
- Archived notice
- self-cancels
- 2023-04-21 20:00Z
- authority
- JRCC HONOLULU 0/23 151719Z APR 23.
- NAVAREA
- NAVAREA XII
- issued by
- JRCC HONOLULU
- sea
- North Pacific Ocean
- position
- 23.708, -157.350
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH PACIFIC. 1. HAZARDOUS OPERATIONS 171100Z TO 171900Z APR, ALTERNATE 1300Z TO 1900Z DAILY 18 THRU 21 APR IN AREA BOUND BY 23-50.00N 157-47.00W, 23-26.00N 157-41.00W, 23-35.00N 156-55.00W, 23-59.00N 157-01.00W. 2. CANCEL THIS MSG 212000Z 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.
- 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
30 within 180 nm since 1999 · 4 in the last 12 months · 1 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 301700Z sep to 010200Z oct in area within one mile of 21-17.11N 157-59.40W2026-09-21
- Hazardous operations 171700Z to 180300Z sep in area within one mile of 21-17.48N 157-59.23W2026-09-16
- Hazardous operations 091600Z to 110400Z sep in area within one mile of 21-17.48N 157-59.23W2026-09-04
- Hazardous operations 27 thru 31 aug in area bound by 22-02.00N 159-48.00W, 22-02.00N 159-53.00W, 22-11.00N…2026-08-19
- Hazardous operations 1900Z to 0330Z daily 24 thru 26 oct, alternate 1900Z to 0330Z daily 27 and 28 oct in…2022-10-19
- Hazardous operations sunrise to sunset daily 11 thru 27 jul in area bound by 22-00.00N 159-47.00W, 21-50.00N…2022-07-06
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
32 military exercises listed in force · see all
Record snapshot 2026-09-27 23:47Z; 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.