Exercises

Hazardous operations 181230Z to 182030Z jan in areas bound by: a. 33-33.95N 120-11.23W, 33-28.48N…

North Pacific Ocean · NAVAREA XII 21/23

What this record establishes

Archived notice · 2023-01-18 21:30Z

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) · SEA RANGE OTC 0/23 132139Z JAN 23.. Issued 2023-01-13 23:14Z. 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.

Current notices and reporting history in the North Pacific Ocean →

Activity windows · 1 in this warning

opens (UTC)	closes (UTC)	local	length
2023-01-18 12:30Z	2023-01-18 20:30Z	—	8 h

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued: 2023-01-13 23:14Z
status: Archived notice
self-cancels: 2023-01-18 21:30Z
authority: SEA RANGE OTC 0/23 132139Z JAN 23.
NAVAREA: NAVAREA XII
issued by: SEA RANGE OTC
sea: North Pacific Ocean
position: 32.419, -130.099
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 181230Z TO 182030Z JAN
   IN AREAS BOUND BY:
   A. 33-33.95N 120-11.23W, 33-28.48N 121-46.50W,
      33-24.90N 122-34.12W, 32-58.97N 122-31.24W,
      33-02.53N 121-43.85W, 33-14.77N 120-09.25W.
   B. 33-02.63N 128-18.60W, 32-27.60N 131-56.44W,
      31-47.70N 131-51.83W, 32-22.67N 128-15.58W.
   C. 31-16.35N 136-21.56W, 31-04.60N 137-16.95W,
      30-49.63N 137-15.45W, 31-01.37N 136-20.05W.
2. CANCEL THIS MSG 182130Z JAN 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.

All warning terms →

Collected reports in this area · military exercises

31 within 180 nm since 2000 · 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

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 2026-10-01 13:59Z; 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.