Exercises

Hazardous operations: a. 092006Z to 092038Z dec in area bound by 23-54-32N 122-54-26E, 23-24-43N 124-26-27E,…

Philippine Sea · HYDROPAC 3632/20

What this record establishes

Archived notice · 2020-12-09 21:52Z

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) · NAVAREA XI 473/20 081236Z DEC 20.. Issued 2020-12-08 13:11Z. 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 · 2 in this warning

opens (UTC)closes (UTC)locallength
2020-12-09 20:06Z2020-12-09 20:38Z—32 min
2020-12-09 20:07Z2020-12-09 20:52Z—45 min

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

issued
2020-12-08 13:11Z
status
Archived notice
self-cancels
2020-12-09 21:52Z
authority
NAVAREA XI 473/20 081236Z DEC 20.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
Philippine Sea
position
23.319, 123.546
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

NORTH PACIFIC.
PHILIPPINE SEA.
DNC 12. DNC 23.
1. HAZARDOUS OPERATIONS:
   A. 092006Z TO 092038Z DEC IN AREA BOUND BY
      23-54-32N 122-54-26E, 23-24-43N 124-26-27E,
      22-43-53N 124-10-45E, 23-13-35N 122-39-05E.
   B. 092007Z TO 092052Z DEC IN AREA BOUND BY
      02-42-40N 165-38-59E, 04-04-58N 163-19-17E,
      04-42-26N 163-41-06E, 03-20-04N 166-00-52E.
2. CANCEL THIS MSG 092152Z DEC 20.

Reading this warning

DNC (Digital Nautical Chart)
A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
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

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

99
00
05
10
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

Worldwide in the collected sources

9 military exercises listed in force · see all

Record snapshot 2026-10-03 01:56Z; 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.