Exercises

Hazardous operations: a. 1830Z to 2349Z daily 30 may thru 01 jun in area bound by 34-40N 124-10W, 34-59N…

North Pacific Ocean · NAVAREA XII 232/17

What this record establishes

Archived notice · 2017-05-30 20:20Z

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) · WESTERN RANGE 170016Z MAY 17.. Issued 2017-05-25 23:12Z. 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
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.

Related notices and cancellation links

Current notices and reporting history in the North Pacific Ocean →

Activity windows · 6 in this warning

opens (UTC)closes (UTC)locallength
2017-05-30 18:30Z2017-05-30 23:49Z—5 h 19
2017-05-30 18:30Z2017-05-31 00:30Z—6 h
2017-05-31 18:30Z2017-05-31 23:49Z—5 h 19
2017-05-31 18:30Z2017-06-01 00:30Z—6 h
2017-06-01 18:30Z2017-06-01 23:49Z—5 h 19
2017-06-01 18:30Z2017-06-02 00:30Z—6 h

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

issued
2017-05-25 23:12Z
status
Archived notice
self-cancels
2017-06-02 01:30Z
authority
WESTERN RANGE 170016Z MAY 17.
NAVAREA
NAVAREA XII
issued by
WESTERN RANGE
sea
North Pacific Ocean
position
31.925, -149.660
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN NORTH PACIFIC.
CALIFORNIA.
1. HAZARDOUS OPERATIONS:
   A. 1830Z TO 2349Z DAILY 30 MAY THRU 01 JUN
      IN AREA BOUND BY
      34-40N 124-10W, 34-59N 124-10W,
      35-00N 121-36W, 34-41N 121-36W.
   B. 1830Z TO 2349Z DAILY 30 MAY THRU 01 JUN
      IN AREA BOUND BY
      34-37N 125-46W, 35-02N 125-47W,
      35-02N 125-12W, 34-37N 125-11W.
   C. 1830Z TO 0030Z COMMENCING DAILY 30 MAY THRU
      01 JUN IN AREAS BOUND BY:
      32-05N 157-33W, 32-59N 152-22W,
      33-03N 151-25W, 33-24N 149-54W,
      33-55N 146-15W, 34-48N 146-07W,
      35-11N 141-27W, 32-14N 142-18W,
      31-28N 146-35W, 29-59N 150-55W,
      28-08N 157-47W.
2. CANCEL NAVAREA XII 231/17.
2. CANCEL THIS MSG 020130Z JUN 17.

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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
NAVAREA
One of the 21 ocean areas of the World-Wide Navigational Warning Service, each with a coordinator that broadcasts long-range warnings.
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

11 within 180 nm since 2001 · 0 in the last 12 months · 0 listed in force now

01
05
10
15
17

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

9 military exercises listed in force · see all

Record snapshot 2026-10-02 17:48Z; 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.