Surveys

Survey operations 12 jul thru 12 sep by M/V dong fang kan tan in areas bound by: a. 52-52-12N 143-30-03E,…

Sea of Okhotsk · HYDROPAC 2507/18

What this record establishes

Archived notice · 2018-09-07 11:39Z

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 166/18 090904Z JUL 18.. Issued 2018-07-09 09:41Z. 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 →

issued: 2018-07-09 09:41Z
status: Archived notice
authority: VLADIVOSTOK 166/18 090904Z JUL 18.
issued by: VLADIVOSTOK
sea: Sea of Okhotsk
position: 51.421, 143.653
vessel: M/V DONG FANG KAN TAN · 5 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SEA OF OKHOTSK.
SAKHALIN.
DNC 24.
1. SURVEY OPERATIONS 12 JUL THRU 12 SEP BY
   M/V DONG FANG KAN TAN IN AREAS BOUND BY:
   A. 52-52-12N 143-30-03E, 52-59-37N 143-28-06E,
      52-59-47N 143-29-41E, 52-52-21N 143-31-38E.
   B. 52-38-54N 143-34-14E, 52-46-20N 143-32-18E,
      52-46-29N 143-33-53E, 52-39-03N 143-35-49E.
   C. 51-20-01N 143-36-03E, 51-30-41N 143-34-19E,
      51-30-32N 143-42-22E, 51-20-00N 143-44-01E.
   ONE MILE BERTH REQUESTED.
2. CANCEL THIS MSG 13 SEP 18.

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.
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.

All warning terms →

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

Underwater operations 01 may thru 31 oct in areas bound by: a. 51-27.95N 143-26.72E, 51-29.25N 143-45.52E,…Surveys · 3.8 nm
Wave rider buoy established in 51-22.54N 144-14.17ENav aids · 22 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 · 23.6 nm

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-03 15:10Z; 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.