Exercises

Hazardous operations 021230Z to 022000Z may, alternate 041230Z to 042000Z may in area bound by 28-20.65N…

North Pacific Ocean · NAVAREA XII 244/23

What this record establishes

Archived notice · 2023-05-03 18:19Z

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 251936Z APR 23.. Issued 2023-04-27 08:26Z. 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 · 2 in this warning

opens (UTC)closes (UTC)locallength
2023-05-02 12:30Z2023-05-02 20:00Z—7 h 30
2023-05-04 12:30Z2023-05-04 20:00Z—7 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
2023-04-27 08:26Z
status
Archived notice
self-cancels
2023-05-04 21:00Z
authority
SEA RANGE OTC 0/23 251936Z APR 23.
NAVAREA
NAVAREA XII
issued by
SEA RANGE OTC
sea
North Pacific Ocean
position
27.320, -140.823
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN NORTH PACIFIC.
1. HAZARDOUS OPERATIONS 021230Z TO 022000Z MAY,
   ALTERNATE 041230Z TO 042000Z MAY
   IN AREA BOUND BY
   28-20.65N 139-47.33W, 27-26.72N 142-21.67W,
   26-17.92N 141-50.77W, 27-11.27N 139-17.77W.
2. CANCEL THIS MSG 042100Z MAY 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

7 within 180 nm since 2014 · 0 in the last 12 months · 0 listed in force now

14
15
20
23

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 21:35Z; 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.