Survey operations 211200Z to 251200Z may by cableship leon thevnin in areas within one mile of: a. 09-34.4S…
South Atlantic Ocean · HYDROLANT 1551/18
What this record establishes
Archived notice · 2018-05-25 13:00Z
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 VII 167/18 181030Z MAY 18.. Issued 2018-05-18 11:05Z. 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
- South Atlantic Ocean. The parsed report position is -9.574, 13.052. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Cancel HYDROLANT 1551/18 and this msglater cancellation notice
Current notices and reporting history in the South Atlantic Ocean →
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-05-21 12:00Z | 2018-05-25 12:00Z | — | 96 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2018-05-18 11:05Z
- status
- Archived notice
- self-cancels
- 2018-05-25 13:00Z
- authority
- NAVAREA VII 167/18 181030Z MAY 18.
- NAVAREA
- NAVAREA VII · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -9.574, 13.052
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN SOUTH ATLANTIC. ANGOLA. DNC 01. 1. SURVEY OPERATIONS 211200Z TO 251200Z MAY BY CABLESHIP LEON THEVNIN IN AREAS WITHIN ONE MILE OF: A. 09-34.4S 013-03.0E. B. 09-34.4S 013-00.0E. C. 09-34.6S 012-53.8E. D. 09-34.5S 013-09.0E. E. 09-34.4S 013-09.7E. TWO MILE BERTH REQUESTED. 2. CANCEL THIS MSG 251300Z MAY 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.
- Cable operations
- A ship is laying, burying or repairing a submarine cable, usually along a stated route.
- 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.
Collected reports in this area · cable & pipeline work
34 within 180 nm since 2000 · 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 30 dec by cableship rene descartes with submersible in area within two…2017-12-18
- Cable operations 06 nov until further notice by cableship rene descartes with submersible along trackline…2017-11-03
- Seismic survey in progress until further notice by M/V ramform atlas towing 5000 meter long cable in area…2017-08-28
- Seismic survey 01 jul until further notice by M/V ramform atlas towing 5000 meter long cable in area bound…2017-06-30
- Pipeline operations in progress until further notice in area within eight miles of 07-27.65S 011-34.25E2017-03-16
- Seismic survey in progress until 16 jun by M/V endeavor towing 5.5 mile long cable in area bound by…2015-05-04
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 00:59Z; 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.