Surveys

Survey operations in progress until 100600Z jul: a. in area bound by 49-40-00N 151-45-00E, 49-44-00N…

Sea of Okhotsk · HYDROPAC 1920/21

What this record establishes

Archived notice · 2021-07-06 09:14Z

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) · VLADIVOSTOK 155/21 300921Z JUN 21.. Issued 2021-06-30 10:29Z. 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.

Related notices and cancellation links

Current notices and reporting history in the Sea of Okhotsk →

issued
2021-06-30 10:29Z
status
Archived notice
self-cancels
2021-07-10 07:00Z
authority
VLADIVOSTOK 155/21 300921Z JUN 21.
issued by
VLADIVOSTOK
sea
Sea of Okhotsk
position
49.673, 153.932
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN NORTH PACIFIC.
SEA OF OKHOTSK.
KURIL ISLANDS.
DNC 24.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 100600Z JUL:
   A. IN AREA BOUND BY
      49-40-00N 151-45-00E, 49-44-00N 154-55-00E,
      49-32-13N 154-53-30E, 49-35-30N 154-46-30E.
   B. IN AREA WITHIN 02 MILES OF 49-58N 155-11E.
   C. IN AREA WITHIN 02 MILES OF 49-52N 155-24E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 100700Z JUL 21.

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.
Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
Within a radius of
A circular area — every position within a stated distance of a point.
Wide berth requested
Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
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 · survey operations

7 within 180 nm since 2019 · 0 in the last 12 months · 0 listed in force now

19
20
23

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

56 survey operations listed in force · see all

Record snapshot 2026-10-02 20:05Z; source collection times vary.

Surveys

Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →

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.