Exercises

Hazardous operations are scheduled daily 2200 to 1000 UTC 28 through 30 September in an area off Guam; cancel message 011100 UTC October 26.

North Pacific Ocean · HYDROPAC 2753/26

What this record establishes

Cancelled notice · 2026-09-23 14:45Z

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: NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-09-23 08:01Z. First collected 2026-09-23 15:02Z; last seen in collection 2026-09-24 12:17Z. 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 · 3 in this warning

opens (UTC)	closes (UTC)	local	length
2026-09-28 22:00Z	2026-09-29 10:00Z	—	12 h
2026-09-29 22:00Z	2026-09-30 10:00Z	—	12 h
2026-09-30 22:00Z	2026-10-01 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: 2026-09-23 08:01Z
status: Cancelled notice
self-cancels: 2026-10-01 11:00Z
sea: North Pacific Ocean
position: 11.702, 143.988
source: NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-09-23 15:02Z

Original warning text

NORTH PACIFIC.
GUAM.
1. HAZARDOUS OPERATIONS 2200Z TO 1000Z
   DAILY 28 THRU 30 SEP IN AREA BOUND BY
   12-40.00N 144-45.00E, 11-00.00N 144-45.00E,
   11-00.00N 143-00.00E, 11-45.00N 143-00.00E,
   12-40.00N 144-16.15E.
2. CANCEL THIS MSG 011100Z OCT 26.

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.
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

957 within 180 nm since 2002 · 53 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

Uscg remote communication facility guam 13-29.00N 144-50.00E broadcast and communication services unreliableNav aids · 117.9 nm
Guam hf NAVTEX station, V, 13-29.0N 144-50.0E, off airNav aids · 117.9 nm

Worldwide in the collected sources

17 military exercises listed in force · see all

Record snapshot 2026-09-24 12:21Z; 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.