Exercises · Exercises

Gunnery exercise in North Pacific near Nanpo Shoto daily from 31 July to 30 August, 2300Z to 0900Z, in a bounded area.

North Pacific Ocean · NAVAREA XI 342/26

What this record establishes

Cancelled notice · 2026-08-31 16:21Z

This notice disappeared from the issuing source's in-force list. No explicit recovery or all-clear is established by that removal.

Source and dates
Japan Coast Guard JHOD NAVAREA XI · Japan Coast Guard (JHOD). Issued 2026-07-27 12:00Z. First collected 2026-08-17 13:42Z; last seen in collection 2026-08-17 14:24Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered
North Pacific Ocean. 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 North Pacific Ocean →

Activity windows · 31 in this warning

opens (UTC)closes (UTC)locallength
2026-07-31 23:00Z2026-08-01 09:00Z—10 h
2026-08-01 23:00Z2026-08-02 09:00Z—10 h
2026-08-02 23:00Z2026-08-03 09:00Z—10 h
2026-08-03 23:00Z2026-08-04 09:00Z—10 h
2026-08-04 23:00Z2026-08-05 09:00Z—10 h
2026-08-05 23:00Z2026-08-06 09:00Z—10 h
2026-08-06 23:00Z2026-08-07 09:00Z—10 h
2026-08-07 23:00Z2026-08-08 09:00Z—10 h
… 23 more

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

issued
2026-07-27 12:00Z
status
Cancelled notice
self-cancels
2026-08-31 10:00Z
authority
Japan Coast Guard (JHOD)
NAVAREA
NAVAREA XI
issued by
JAPAN COAST GUARD
sea
North Pacific Ocean
position
26.584, 146.193
nearest port
Yokosuka · 622 nm
source
Japan Coast Guard JHOD NAVAREA XI · first seen 2026-08-17 13:42Z

Original warning text

NORTH PACIFIC, NANPO SHOTO.
GUNNERY. 2300Z TO 0900Z COMMENCING DAILY
31 JUL TO 30 AUG. AREA BOUNDED BY
28-15-15N 146-29-47E
25-25-16N 147-37-47E
25-00-16N 145-35-48E
27-55-15N 144-57-48E.
CANCEL THIS MSG 311000Z AUG.

Reading this warning

Gunnery and live firing
Naval or coastal guns firing into a sea area for practice, at stated times.
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.
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.

All warning terms →

Collected reports in this area · military exercises

248 within 180 nm since 2000 · 9 in the last 12 months · 2 listed in force now

00
05
10
15
20
25
26

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 04:56Z; 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.