Seismic survey in progress until further notice by M/V ramform sterling towing 8100 meter long cable in area…
South Atlantic Ocean · HYDROLANT 135/16
What this record establishes
Archived notice · 2016-02-22 08:24Z
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 16/16 150753Z JAN 16.. Issued 2016-01-15 19:53Z. 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
- Seismic survey in progress until further notice by M/V ramform sterling towing 8000 meter long cable in area…cancelled by this notice
- Cancel HYDROLANT 135/16 and this msglater cancellation notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2016-01-15 19:53Z
- status
- Archived notice
- authority
- NAVAREA VII 16/16 150753Z JAN 16.
- NAVAREA
- NAVAREA VII · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -23.269, 12.053
- vessel
- M/V RAMFORM STERLING · 24 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN SOUTH ATLANTIC. NAMIBIA. DNC 01. 1. SEISMIC SURVEY IN PROGRESS UNTIL FURTHER NOTICE BY M/V RAMFORM STERLING TOWING 8100 METER LONG CABLE IN AREA BOUND BY 22-49.2S 011-46.8E, 22-49.2S 012-39.6E, 23-24.0S 012-43.8E, 23-44.0S 011-53.4E 23-44.0S 011-15.6E. NINE MILE BERTH REQUESTED. 2. CANCEL HYDROLANT 3170/15.
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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- 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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROLANT
- The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
Collected reports in this area · cable & pipeline work
23 within 180 nm since 2012 · 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 27 aug until further notice by cableship leon thevenin in area bound by 22-40.80S…2022-08-22
- Cable operations in progress until further notice by cableship ile de sein in area bound by 23-37.20S…2022-06-20
- Cable operations in progress until further notice by cableship ile de sein in area bound by 22-38.80S…2022-06-15
- Cable operations in progress until further notice by cableship leon thevenin in vicinity of 22-40.1S 014-30.2E2019-09-06
- Cable operations in progress until further notice by cableship leon thevenin in vicinity of 22-40.1S 014-30.2E2019-09-03
- Cable operations in progress until further notice by M/V fugro gauss towing 3000M cable along trackline…2019-07-26
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
23 cable & pipeline work listed in force · see all
Record snapshot 2026-09-25 00:36Z; 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.