Seismic survey 231800Z mar thru 232359Z may by M/V geo coral towing ten 11500 meter long cables in area…
North Atlantic Ocean · HYDROLANT 691/15
What this record establishes
Archived notice · 2015-05-24 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 93/15 221644Z MAR 15.. Issued 2015-03-22 16:48Z. 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
- 2015-03-22 16:48Z
- status
- Archived notice
- self-cancels
- 2015-05-24 00:59Z
- authority
- NAVAREA II 93/15 221644Z MAR 15.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 29.541, -11.896
- vessel
- M/V GEO CORAL · 58 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. SEISMIC SURVEY 231800Z MAR THRU 232359Z MAY BY M/V GEO CORAL TOWING TEN 11500 METER LONG CABLES IN AREA BOUND BY 29-56N 011-55W, 29-41N 011-45W, 29-51N 011-41W, 29-39N 011-42W, 29-14N 011-50W, 29-19N 012-07W. EIGHT MILE BERTH REQUESTED. 2. CANCEL THIS MSG 240059Z MAY 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.
- Seismic survey
- A survey that maps the rock beneath the seabed with sound pulses from air guns, recorded on streamers kilometres long.
- 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.
Collected reports in this area · cable & pipeline work
23 within 180 nm since 1998 · 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.
- Cable operations in progress until further notice by cableship teliri along trackline joining 26-16.5N…2021-04-21
- Cable operations 121900Z oct until further notice by M/V layla in area bound by 32-40N 011-16W, 32-38N…2018-10-12
- Cable operations in progress 13 oct until further notice by M/V layla in area bound by 32-40N 011-15W,…2018-10-11
- Cable operations 100600Z jan to 082359Z feb by M/V rebecca along trackline joining 28-50.5N 014-25.2W,…2017-01-10
- Seismic survey in progress until further notice by M/V polarcus adira towing 12 9000 meter long cables in…2014-04-11
- Seismic survey in progress until 230100Z apr by M/V polarcus adira towing 12 8100 meter long cables in area…2014-03-13
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
24 cable & pipeline work listed in force · see all
Record snapshot 2026-10-02 05:13Z; source collection times vary.
Cable ops
Cable laying, pipeline and seismic operations. All current cable & pipeline work →
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.