Seismic survey in progress until further notice in area bound by 02-30.19S 008-49.10E, 02-14.29S 009-13.49E,…
South Atlantic Ocean · HYDROLANT 25/17
What this record establishes
Archived notice · 2017-03-30 16:38Z
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 2/17 030819Z JAN 17.. Issued 2017-01-03 08:57Z. 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 map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Cancel HYDROLANT 25/17 and this msglater cancellation notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2017-01-03 08:57Z
- status
- Archived notice
- authority
- NAVAREA II 2/17 030819Z JAN 17.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -3.047, 9.668
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN SOUTH ATLANTIC. GABON. DNC 01. SEISMIC SURVEY IN PROGRESS UNTIL FURTHER NOTICE IN AREA BOUND BY 02-30.19S 008-49.10E, 02-14.29S 009-13.49E, 03-33.06S 010-30.46E, 03-45.15S 010-21.09E, 03-44.40S 009-57.40E. WIDE BERTH REQUESTED.
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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- 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.
Collected reports in this area · cable & pipeline work
46 within 180 nm since 1999 · 1 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 190001Z sep until further notice by cableship leon thevenin in area bound by 05-27.80S…2026-09-15
- Cable operations 171200Z jan until further noticed by cableship leon thevenin in vicinity of trackline…2024-01-14
- Cable operations in progress until 25 jan by cableship ile de sein along trackline joining 04-35.30S…2024-01-11
- Cable operations in progress until 10 jan 24 by cableship ile de sein in vicinity of trackline joining…2023-12-31
- Cable operations 301200Z aug until further notice by cableship leon thevenin in area bound by 05-40.00S…2023-08-27
- Cable operations in progress until further notice by cableship leon thevenin with submersible in area bound…2023-04-06
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 11:25Z; 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.