Exercises

Hazardous operations 310530Z to 311100Z mar, alternate 0530Z to 1100Z daily 01 and 02 apr in area bound by…

North Pacific Ocean · NAVAREA XII 145/23

What this record establishes

Archived notice · 2023-03-31 06:34Z

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) · PACMISRANFAC 0/23 101810Z MAR 23.. Issued 2023-03-24 09:46Z. 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
2023-03-31 05:30Z2023-03-31 11:00Z—5 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
2023-03-24 09:46Z
status
Archived notice
self-cancels
2023-04-02 12:00Z
authority
PACMISRANFAC 0/23 101810Z MAR 23.
NAVAREA
NAVAREA XII
issued by
PACMISRANFAC
sea
North Pacific Ocean
position
28.449, -166.972
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

NORTH PACIFIC.
HAWAII.
1. HAZARDOUS OPERATIONS 310530Z TO 311100Z MAR,
   ALTERNATE 0530Z TO 1100Z DAILY 01 AND 02 APR
   IN AREA BOUND BY
   24-00.00N 167-37.00W, 26-22.00N 173-34.00W,
   28-08.00N 174-20.00W, 30-40.00N 174-00.00W,
   33-04.00N 168-15.00W, 32-24.00N 162-12.00W,
   30-01.00N 160-25.00W, 26-00.00N 161-20.00W,
   25-56.00N 162-50.00W, 24-26.00N 161-22.00W,
   23-26.00N 160-30.00W, 22-29.00N 159-55.00W,
   22-03.00N 159-45.00W, 22-02.00N 159-46.00W,
   22-11.00N 160-15.00W, 22-45.00N 161-12.00W,
   23-35.00N 162-23.00W, 24-50.00N 164-02.00W.
2. CANCEL THIS MSG 021200Z 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.

All warning terms →

Collected reports in this area · military exercises

17 within 180 nm since 2008 · 0 in the last 12 months · 0 listed in force now

08
10
15
20
24

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

28 military exercises listed in force · see all

Record snapshot 2026-10-01 15:43Z; 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.