Exercises

Gunnery exercises 122200Z to 131400Z and 132200Z to 141000Z apr within 31 miles of 23-26.5N 122-21.5E

Philippine Sea · HYDROPAC 717/10

What this record establishes

Archived notice · 2010-04-14 11:00Z

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) · NAVAREA XI 225/10 080836Z APR 10 - NAVAREA XI 226/10 080836Z APR 10.. Issued 2010-04-08 14:12Z. 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 parsed report position is 23.442, 122.358 with a 31.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Philippine Sea →

Activity windows · 2 in this warning

opens (UTC)closes (UTC)locallength
2010-04-12 22:00Z2010-04-13 14:00Z—16 h
2010-04-13 22:00Z2010-04-14 10:00Z—12 h

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

issued
2010-04-08 14:12Z
status
Archived notice
self-cancels
2010-04-14 11:00Z
authority
NAVAREA XI 225/10 080836Z APR 10 - NAVAREA XI 226/10 080836Z APR 10.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
Philippine Sea
position
23.442, 122.358 · r 31.0 nm
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

TAIWAN-EAST COAST.
GUNNERY.
1. GUNNERY EXERCISES 122200Z TO 131400Z
   AND 132200Z TO 141000Z APR WITHIN
   31 MILES OF 23-26.5N 122-21.5E.
2. CANCEL HYDROPAC 680/10(71,72).
3. CANCEL THIS MSG 141100Z APR.

Reading this warning

Gunnery and live firing
Naval or coastal guns firing into a sea area for practice, at stated times.
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.
Within a radius of
A circular area — every position within a stated distance of a point.
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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROPAC
The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.
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

799 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

28 military exercises listed in force · see all

Record snapshot 2026-10-01 23:00Z; 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.