Hazardous operations 110300Z to 110931Z dec, alternate 0300Z to 0931Z daily 12 thru 15 dec in areas bound…
North Pacific Ocean · HYDROPAC 4397/18
What this record establishes
Archived notice · 2018-12-11 08:02Z
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) · RTS SAFETY KWAJALEIN MH 291935Z NOV 18.. Issued 2018-12-10 09:14Z. 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 HYDROPAC 4397/18 and this msg, operations completedlater cancellation notice
Current notices and reporting history in the North Pacific Ocean →
Activity windows · 5 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-12-11 03:00Z | 2018-12-11 09:31Z | — | 6 h 31 |
| 2018-12-12 03:00Z | 2018-12-12 09:31Z | — | 6 h 31 |
| 2018-12-13 03:00Z | 2018-12-13 09:31Z | — | 6 h 31 |
| 2018-12-14 03:00Z | 2018-12-14 09:31Z | — | 6 h 31 |
| 2018-12-15 03:00Z | 2018-12-15 09:31Z | — | 6 h 31 |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2018-12-10 09:14Z
- status
- Archived notice
- self-cancels
- 2018-12-15 10:31Z
- authority
- RTS SAFETY KWAJALEIN MH 291935Z NOV 18.
- issued by
- RTS SAFETY KWAJALEIN MH
- sea
- North Pacific Ocean
- position
- 11.781, 165.288
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
NORTH PACIFIC.
DNC 12.
1. HAZARDOUS OPERATIONS 110300Z TO 110931Z DEC,
ALTERNATE 0300Z TO 0931Z DAILY 12 THRU 15 DEC
IN AREAS BOUND BY:
A. 08-30N 160-13E, 08-20N 160-19E,
08-29N 160-32E, 08-38N 160-26E.
B. 11-35N 164-35E, 11-15N 164-48E,
12-20N 166-33E, 12-41N 166-18E.
2. CANCEL THIS MSG 151031Z DEC 18.
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
42 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 130800Z to 131330Z jun, alternate 0800Z to 1330Z daily 14 jun thru 03 jul in areas…2025-06-03
- Hazardous operations 280001Z to 280630Z aug, alternate 0001Z to 0630Z daily 29 aug thru 03 sep in areas…2019-08-23
- Hazardous operations 280001Z to 280630Z aug, alternate 0001Z to 0630Z daily 29 aug thru 03 sep in areas…2019-08-23
- Hazardous operations 040915Z to 041310Z apr, alternate 0915Z to 1255Z daily 05 thru 08 apr in areas bound…2018-03-30
- Hazardous operations 040915Z to 041230Z apr, alternate 0915Z to 1215Z daily 05 thru 08 apr in areas bound…2018-03-30
- Hazardous operations 300730Z to 301330Z jan, alternate 0730Z to 1330Z daily 31 jan thru 03 feb area bound by…2018-01-26
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 2026-10-02 04:34Z; 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.