Surveys

Survey operations 1800Z to 0200Z commencing daily by M/V walther herwig III within five miles of: a.…

North Atlantic Ocean · HYDROLANT 834/15

What this record establishes

Archived notice · 2015-04-21 03:00Z

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 116/15 091651Z APR 15.. Issued 2015-04-09 17:06Z. 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 parsed report position is 34.378, -14.750. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Current notices and reporting history in the North Atlantic Ocean →

issued: 2015-04-09 17:06Z
status: Archived notice
self-cancels: 2015-04-21 03:00Z
authority: NAVAREA II 116/15 091651Z APR 15.
NAVAREA: NAVAREA II · named as the source of this relay
sea: North Atlantic Ocean
position: 34.378, -14.750
vessel: M/V WALTHER HERWIG III · 3 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN NORTH ATLANTIC.
DNC 01, DNC 08.
1. SURVEY OPERATIONS 1800Z TO 0200Z COMMENCING DAILY
   BY M/V WALTHER HERWIG III WITHIN FIVE MILES OF:
   A. 23-50.0N 020-03.6W ON 11 APR.
   B. 26-19.8N 019-21.0W ON 12 APR.
   C. 31-14.8N 017-19.2W ON 14 APR.
   D. 37-21.6N 013-42.0W ON 16 APR.
   E. 41-03.0N 011-09.0W ON 18 APR.
   F. 46-27.0N 006-55.2W ON 20 APR.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 210300Z APR 15.

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.
Within a radius of: A circular area — every position within a stated distance of a point.
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 →

Collected reports in this area · survey operations

8 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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 06:27Z; 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.