Exercises

Hazardous operations 071827Z to 071840Z dec in area bound by 22-20-00N 126-42-46E, 22-35-20N 126-48-37E,…

Philippine Sea · HYDROPAC 4346/18

What this record establishes

Archived notice · 2018-12-07 19:40Z

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 619/18 060603Z DEC 18.. Issued 2018-12-06 06:12Z. 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)locallength
2018-12-07 18:27Z2018-12-07 18:40Z—13 min

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

issued
2018-12-06 06:12Z
status
Archived notice
self-cancels
2018-12-07 19:40Z
authority
NAVAREA XI 619/18 060603Z DEC 18.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
Philippine Sea
position
22.309, 127.219
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

PHILIPPINE SEA.
DNC 23.
1. HAZARDOUS OPERATIONS 071827Z TO 071840Z DEC
   IN AREA BOUND BY
   22-20-00N 126-42-46E, 22-35-20N 126-48-37E,
   22-17-01N 127-43-31E, 22-01-43N 127-37-34E.
2. CANCEL THIS MSG 071940Z DEC 18.

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

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

03
05
10
15
18

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

10 military exercises listed in force · see all

Record snapshot 2026-10-03 05:09Z; 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.