Exercises

Hazardous operations 310530Z to 311100Z mar, alternate 010530Z to 011100Z and 020530Z to 021100Z apr in area…

North Pacific Ocean · NAVAREA XII 94/23

What this record establishes

Archived notice · 2023-03-10 18:44Z

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 282336Z FEB 23.. Issued 2023-02-28 23:59Z. 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 · 3 in this warning

opens (UTC)closes (UTC)locallength
2023-03-31 05:30Z2023-03-31 11:00Z—5 h 30
2023-04-01 05:30Z2023-04-01 11:00Z—5 h 30
2023-04-02 05:30Z2023-04-02 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
2023-02-28 23:59Z
status
Archived notice
self-cancels
2023-04-02 12:00Z
authority
PACMISRANFAC 0/23 282336Z FEB 23.
NAVAREA
NAVAREA XII
issued by
PACMISRANFAC
sea
North Pacific Ocean
position
28.394, -166.892
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 010530Z TO 011100Z AND 020530Z TO 021100Z 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 160-31.00W,
   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

9 military exercises listed in force · see all

Record snapshot 2026-10-02 17:05Z; 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.