Exercises

Hazardous operations 151212Z to 151547Z sep, alternate 1212Z to 1547Z daily 16 thru 18 sep in area bound by…

North Pacific Ocean · NAVAREA XII 380/18

What this record establishes

Archived notice · 2018-09-15 14:15Z

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) · WESTERN RANGE 292032Z AUG 18.. Issued 2018-09-10 07:29Z. 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 · 4 in this warning

opens (UTC)closes (UTC)locallength
2018-09-15 12:12Z2018-09-15 15:47Z—3 h 35
2018-09-16 12:12Z2018-09-16 15:47Z—3 h 35
2018-09-17 12:12Z2018-09-17 15:47Z—3 h 35
2018-09-18 12:12Z2018-09-18 15:47Z—3 h 35

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

issued
2018-09-10 07:29Z
status
Archived notice
self-cancels
2018-09-18 16:47Z
authority
WESTERN RANGE 292032Z AUG 18.
NAVAREA
NAVAREA XII
issued by
WESTERN RANGE
sea
North Pacific Ocean
position
13.781, -123.545
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 151212Z TO 151547Z SEP,
   ALTERNATE 1212Z TO 1547Z DAILY 16 THRU 18 SEP
   IN AREA BOUND BY
   11-15N 123-14W, 11-22N 124-23W,
   16-18N 123-52W, 16-11N 122-42W.
2. CANCEL THIS MSG 181647Z SEP 18.

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

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

99
00
05
10
15
20
22

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 2026-10-03 01:30Z; 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.