Surveys
Survey operations in progress until 302359Z nov by M/V sw empress towing ten 8000 meter long cables in area…
Eastern North Atlantic · Mauritania · HYDROLANT 2816/20
What this record establishes
Archived notice · 2020-11-26 15:04Z
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 266/20 160409Z SEP 20.. Issued 2020-09-16 04:15Z. 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
- Eastern North Atlantic · Mauritania. No usable coordinates were parsed; a location-based nearby search is unavailable. Check the original wording for limits and qualifications.
Related notices and cancellation links
- issued
- 2020-09-16 04:15Z
- status
- Archived notice
- self-cancels
- 2020-12-01 00:59Z
- authority
- NAVAREA II 266/20 160409Z SEP 20.
- NAVAREA
- NAVAREA II · named as the source of this relay
- vessel
- M/V SW EMPRESS · 48 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH ATLANTIC. MAURITANIA. DNC 01. 1. SURVEY OPERATIONS IN PROGRESS UNTIL 302359Z NOV BY M/V SW EMPRESS TOWING TEN 8000 METER LONG CABLES IN AREA BOUND BY 17-42N 19-11W, 16-36N 19-11W, 16-36N 18-10W, 17-42N 18-10W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 010059Z DEC 20.
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.
Nearby notices listed in force · within 120 nm
No parsed position is available for this comparison.
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.