Exercises

Hazardous operations 2200Z to 1000Z daily 17 thru 21 apr in areas bound by: a. 45-46.00N 147-55.00E,…

Sea of Okhotsk · HYDROPAC 1259/23

What this record establishes

Archived notice · 2023-04-22 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 XIII 43/23 152105Z APR 23.. Issued 2023-04-15 21:36Z. 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
Sea of Okhotsk. 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 Sea of Okhotsk →

Activity windows · 5 in this warning

opens (UTC)closes (UTC)locallength
2023-04-17 22:00Z2023-04-18 10:00Z—12 h
2023-04-18 22:00Z2023-04-19 10:00Z—12 h
2023-04-19 22:00Z2023-04-20 10:00Z—12 h
2023-04-20 22:00Z2023-04-21 10:00Z—12 h
2023-04-21 22:00Z2023-04-22 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
2023-04-15 21:36Z
status
Archived notice
self-cancels
2023-04-22 11:00Z
authority
NAVAREA XIII 43/23 152105Z APR 23.
NAVAREA
NAVAREA XIII · named as the source of this relay
sea
Sea of Okhotsk
position
45.520, 148.023
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SEA OF OKHOTSK.
DNC 24.
1. HAZARDOUS OPERATIONS 2200Z TO 1000Z DAILY
   17 THRU 21 APR IN AREAS BOUND BY:
   A. 45-46.00N 147-55.00E, 45-46.00N 148-40.00E,
      45-26.08N 148-30.00E, 45-25.50N 148-00.00E.
   B. 45-35.00N 147-40.00E, 45-17.00N 147-48.00E,
      45-08.00N 147-30.00E, 45-25.00N 147-20.00E.
2. CANCEL THIS MSG 221100Z APR 23.

Reading this warning

DNC (Digital Nautical Chart)
A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
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

41 within 180 nm since 2010 · 2 in the last 12 months · 0 listed in force now

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 17:18Z; 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.