Surveys

Hydrographic survey in progress until 09 jun by M/V thalassa along trackline joining 48-25.0N 005-46.2W,…

North Atlantic Ocean · HYDROLANT 1385/15

What this record establishes

Archived notice · 2015-06-10 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) · THALASSA 061154Z JUN 15.. Issued 2015-06-06 20:40Z. 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 the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.

Current notices and reporting history in the North Atlantic Ocean →

issued: 2015-06-06 20:40Z
status: Archived notice
authority: THALASSA 061154Z JUN 15.
issued by: THALASSA
sea: North Atlantic Ocean
position: 51.958, -18.516
vessel: M/V THALASSA · 139 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 19, DNC 20.
1. HYDROGRAPHIC SURVEY IN PROGRESS UNTIL 09 JUN
   BY M/V THALASSA ALONG TRACKLINE JOINING
   48-25.0N 005-46.2W, 52-00.0N 018-00.0W,
   55-10.0N 031-21.0W.
2. CANCEL THIS MSG 10 JUN 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.
Track line joining: Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
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.
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

2 within 180 nm since 1999 · 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.

Underwater operations in progress until further notice by M/V jean charcot along trackline between 49-30N…1999-08-18

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 08:15Z; 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.