Surveys

Survey operations in progress until 312359Z oct by M/V polar empress towing ten 7050 meter long cables in…

North Atlantic Ocean · HYDROLANT 2661/18

What this record establishes

Archived notice · 2018-11-01 00:59Z

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 II 333/18 201340Z AUG 18.. Issued 2018-08-20 13:45Z. 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: North Atlantic Ocean. 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 North Atlantic Ocean →

issued: 2018-08-20 13:45Z
status: Archived notice
self-cancels: 2018-11-01 00:59Z
authority: NAVAREA II 333/18 201340Z AUG 18.
NAVAREA: NAVAREA II · named as the source of this relay
sea: North Atlantic Ocean
position: 29.788, -10.536
vessel: M/V POLAR EMPRESS · 24 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN NORTH ATLANTIC.
MOROCCO.
DNC 01, DNC 08.
1. SURVEY OPERATIONS IN PROGRESS UNTIL
   312359Z OCT BY M/V POLAR EMPRESS TOWING TEN
   7050 METER LONG CABLES IN AREA BOUND BY
   29-33.3N 010-38.1W, 29-11.3N 011-00.4W,
   29-30.6N 011-18.5W, 29-45.1N 010-49.2W,
   29-59.1N 010-39.1W, 30-20.4N 009-58.3W,
   30-08.4N 009-47.3W, 29-39.3N 010-21.0W.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 010059Z NOV 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.
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.
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

14 within 180 nm since 2001 · 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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 05:14Z; 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.