Exercises

Hazardous operations

Philippine Sea · HYDROPAC 1520/11

What this record establishes

Archived notice · 2011-05-24 04:54Z

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) · CTF 74 110949Z MAY 11 - CTF 74 171339Z MAY 11.. Issued 2011-05-21 10:32Z. 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
Philippine Sea. 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 Philippine Sea →

Activity windows · 3 in this warning

opens (UTC)closes (UTC)locallength
2011-05-26 20:00Z2011-05-27 19:00Z—23 h
2011-05-28 21:00Z2011-05-29 18:00Z—21 h
2011-05-29 22:00Z2011-05-30 17:00Z—19 h

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

issued
2011-05-21 10:32Z
status
Archived notice
self-cancels
2011-05-30 18:00Z
authority
CTF 74 110949Z MAY 11 - CTF 74 171339Z MAY 11.
issued by
CTF
sea
Philippine Sea
position
21.016, 124.763
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN NORTH PACIFIC.
HAZARDOUS OPERATIONS.
1. HAZARDOUS OPERATIONS:
   A. 262000Z TO 271900Z MAY
      IN AREA BOUND BY
      22-30N 122-00E, 22-30N 127-00E,
      19-00N 127-00E, 20-00N 122-30E.
   B. 282100Z TO 291800Z MAY
      IN AREA BETWEEN
      20-00N 16-00N AND 139-00E 145-00E.
   C. 292200Z TO 301700Z MAY
      IN AREA BETWEEN
      20-00N 16-00N AND 146-00E 151-00E.
2. CANCEL THIS MSG 301800Z MAY.

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

133 within 180 nm since 2003 · 0 in the last 12 months · 0 listed in force now

03
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 01:16Z; 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.