Surveys

Underwater operations in the Sea of Okhotsk, Russia, run from 1 May to 31 October; wide berth requested.

Sea of Okhotsk · HYDROPAC 1291/26

What this record establishes

Listed in force

The latest collected record lists this warning as active. This is the status of the notice, not a live observation of conditions at the location.

Source and dates: NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-04-23 12:31Z. First collected 2026-08-17 13:41Z; last seen in collection 2026-10-01 05:02Z. 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 →

issued: 2026-04-23 12:31Z
status: Listed in force
self-cancels: 2026-11-01 00:01Z
sea: Sea of Okhotsk
position: 51.451, 143.741
nearest port: Kholmsk · 272 nm
source: NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-08-17 13:41Z

Original warning text

SEA OF OKHOTSK.
RUSSIA.
1. UNDERWATER OPERATIONS 01 MAY THRU 31 OCT
   IN AREAS BOUND BY:
   A. 51-27.95N 143-26.72E, 51-29.25N 143-45.52E,
      51-24.43N 143-46.80E, 51-23.35N 143-27.97E.
   B. 51-29.25N 143-45.52E, 51-29.36N 143-47.45E,
      51-33.00N 143-45.00E, 51-33.00N 143-53.21E,
      51-23.00N 144-00.00E, 51-23.38N 143-51.71E,
      51-24.65N 143-50.62E, 51-24.43N 143-46.80E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 010001Z NOV 26.

Reading this warning

Underwater operations: Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
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.
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.
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 →

Conditions at the position · now

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MET Norway · NOAA WaveWatch III · HYCOM · GEBCO 2020 · model data at the centroid, not an observation

Collected reports in this area · survey operations

134 within 180 nm since 2000 · 5 in the last 12 months · 2 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

Wave rider buoy established in 51-22.54N 144-14.17ENav aids · 19.1 nm
Underwater operations 25 may thru 31 dec in area bound by 51-34.92N 143-24.27E, 51-34.90N 144-06.22E,…Surveys · 22.3 nm

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-10-01 05:16Z; 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.