Exercises

Hazardous operations 041200Z to 042030Z nov, alternate 1300Z to 2130Z daily 07 and 13 nov in areas bound by:…

North Pacific Ocean · NAVAREA XII 760/23

What this record establishes

Archived notice · 2023-11-07 23:39Z

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 272001Z OCT 23.. Issued 2023-10-30 09:30Z. 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

Current notices and reporting history in the North Pacific Ocean →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2023-11-04 12:00Z2023-11-04 20:30Z—8 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
2023-10-30 09:30Z
status
Archived notice
self-cancels
2023-11-13 22:30Z
authority
SEA RANGE OTC 0/23 272001Z OCT 23.
NAVAREA
NAVAREA XII
issued by
SEA RANGE OTC
sea
North Pacific Ocean
position
32.487, -123.343
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 041200Z TO 042030Z NOV,
   ALTERNATE 1300Z TO 2130Z DAILY 07 AND 13 NOV
   IN AREAS BOUND BY:
   A. 31-55.63N 127-43.18W, 33-12.37N 122-41.36W,
      33-06.52N 119-53.89W, 32-55.31N 119-51.90W,
      32-03.13N 122-28.33W, 31-40.94N 127-39.48W.
   B. 28-34.12N 135-59.93W, 30-09.63N 136-34.60W,
      30-52.95N 133-51.97W, 29-16.77N 133-19.65W.
   C. 26-17.92N 141-50.77W, 27-26.72N 142-21.67W,
      28-20.65N 139-47.33W, 27-11.27N 139-17.77W.
2. CANCEL THIS MSG 132230Z NOV 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

601 within 180 nm since 1999 · 10 in the last 12 months · 0 listed in force now

99
00
05
10
15
20
25
26

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

J
F
M
A
M
J
J
A
S
O
N
D

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 22:57Z; 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.