Surveys

Survey operations in progress until nov 01 by M/V ZEPHIR-1 towing 8500 meter long cable in area bound by…

Japan Sea · HYDROPAC 3356/17

What this record establishes

Archived notice · 2017-11-02 00:01Z

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 93/17 300911Z SEP 17.. Issued 2017-09-30 09:25Z. 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: Japan Sea. 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 Japan Sea →

issued: 2017-09-30 09:25Z
status: Archived notice
authority: NAVAREA XIII 93/17 300911Z SEP 17.
NAVAREA: NAVAREA XIII · named as the source of this relay
sea: Japan Sea
position: 48.009, 141.119
vessel: M/V ZEPHIR-1 · 2 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SEA OF JAPAN.
TATAR STRAIT.
DNC 24.
1. SURVEY OPERATIONS IN PROGRESS UNTIL NOV 01
   BY M/V ZEPHIR-1 TOWING 8500 METER LONG CABLE
   IN AREA BOUND BY
   47-41-19N 139-12-35E, 48-33-37N 140-18-18E,
   49-11-03N 140-42-09E, 50-07-07N 141-37-53E,
   50-07-07N 142-09-30E, 49-39-17N 142-08-05E,
   49-19-36N 142-02-59E, 49-09-23N 141-42-57E,
   48-27-02N 141-42-36E, 47-37-36N 141-57-12E,
   47-17-58N 141-56-49E, 47-14-34N 142-00-39E,
   47-08-48N 142-02-35E, 46-36-09N 141-48-29E,
   46-27-45N 141-49-14E, 46-02-37N 141-54-39E,
   45-42-05N 142-00-30E, 45-42-52N 141-35-07E,
   45-52-42N 141-05-00E, 46-15-09N 141-12-45E,
   47-55-56N 140-54-04E, 47-11-48N 140-08-26E.
   FIVE MILE BERTH REQUESTED
2. CANCEL THIS MSG 02 NOV 17.

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.
Towed array / streamer: Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
Tow / towing: A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
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

12 within 180 nm since 2005 · 0 in the last 12 months · 0 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

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 2026-10-01 20:25Z; 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.