Exercises

Hazardous operations 100300Z to 100800Z mar in areas bound by: a. 24-00N 133-00E, 24-00N 132-21E, 23-40N…

Philippine Sea · HYDROPAC 183/99

What this record establishes

Archived notice · 1999-03-10 00:00Z

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). Issued 1999-03-09 08:50Z. 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.

Current notices and reporting history in the Philippine Sea →

Activity windows · 1 in this warning

opens (UTC)	closes (UTC)	local	length
1999-03-10 03:00Z	1999-03-10 08:00Z	—	5 h

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

issued: 1999-03-09 08:50Z
status: Archived notice
self-cancels: 1999-03-10 09:00Z
sea: Philippine Sea
position: 26.742, 129.875
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. HAZARDOUS OPERATIONS 100300Z TO 100800Z MAR IN AREAS
   BOUND BY:
   A. 24-00N 133-00E, 24-00N 132-21E, 23-40N 131-58E,
      23-37N 131-27E, 23-49N 130-53E, 24-20N 130-30E,
      24-55N 130-39E, 25-20N 131-00E, 25-28N 131-33E,
      25-26N 131-42E, 25-13N 132-31E.
   B. 24-53N 130-05E, 25-41N 130-45E, 26-01N 129-21E,
      25-41N 128-52E.
   C. 26-23N 128-20E, 26-10N 131-00E, 27-06N 131-00E,
      27-06N 129-10E.
2. CANCEL THIS MSG 100900Z MAR.

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

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

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

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

Tropical storm 25W (surigae)Storms · 114.1 nm

Worldwide in the collected sources

17 military exercises listed in force · see all

Record snapshot 2026-09-24 18:31Z; 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.