Exercises

Hazardous operations are scheduled off the California coast in the North Pacific from 2000 UTC to 2300 UTC on October 6 within a defined area.

North Pacific Ocean · NAVAREA XII 690/26

What this record establishes

Cancelled notice · 2026-10-01 16:15Z

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 2026-09-29 23:24Z. First collected 2026-10-01 19:02Z; last seen in collection 2026-10-02 02:17Z. 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 · 1 in this warning

opens (UTC)	closes (UTC)	local	length
2026-10-06 20:00Z	2026-10-06 23:00Z	—	3 h

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

issued: 2026-09-29 23:24Z
status: Cancelled notice
self-cancels: 2026-10-07 00:01Z
NAVAREA: NAVAREA XII
sea: North Pacific Ocean
position: 37.844, -123.703
source: NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-10-01 19:02Z

Original warning text

NORTH PACIFIC.
CALIFORNIA.
1. HAZARDOUS OPERATIONS 062000Z TO 062300Z OCT
   IN AREA BOUND BY
   38-02.00N 123-17.83W, 37-56.00N 123-17.83W,
   37-46.42N 123-10.00W, 37-43.00N 124-00.07W,
   37-50.00N 124-24.57W, 38-00.00N 123-23.07W.
2. CANCEL THIS MSG 070001Z 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.
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

26 within 180 nm since 1999 · 2 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

26C4+CH antioch, ca, USASpills · 91.1 nm

Worldwide in the collected sources

28 military exercises listed in force · see all

Record snapshot 2026-10-02 02:23Z; 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.