Seismic survey in progress until 09 mar by M/V ramform challenger towing 12 6000 meter long cables in area…
Gulf of Guinea · HYDROLANT 420/15
What this record establishes
Archived notice · 2015-03-10 00:01Z
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 50/15 181454Z FEB 15.. Issued 2015-02-18 15:19Z. 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
- Gulf of Guinea. 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
Current notices and reporting history in the Gulf of Guinea →
- issued
- 2015-02-18 15:19Z
- status
- Archived notice
- authority
- NAVAREA II 50/15 181454Z FEB 15.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- Gulf of Guinea
- position
- 3.915, 6.849
- vessel
- M/V RAMFORM CHALLENGER · 110 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
GULF OF GUINEA. NIGERIA. DNC 01. 1. SEISMIC SURVEY IN PROGRESS UNTIL 09 MAR BY M/V RAMFORM CHALLENGER TOWING 12 6000 METER LONG CABLES IN AREA BOUND BY 04-00.6N 006-27.2E, 04-00.7N 007-14.8E, 03-49.3N 007-14.8E, 03-49.1N 006-27.2E. SIX MILE BERTH REQUESTED. 2. CANCEL HYDROLANT 352/15. 3. CANCEL THIS MSG 10 MAR 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.
- 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.
- 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
46 within 180 nm since 1999 · 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 ile de sein along trackline joining 03-00.70N…2024-05-04
- Cable operations 06 apr until further notice by cableship ile de sein along trackline joining 03-14.80N…2024-04-05
- Cable operations in progress until further notice by cableship ile de sein along trackline joining 01-28.20N…2024-02-28
- Cable operations in progress until further notice by cableship ile de sein along trackline joining 00-24.40N…2024-02-20
- Seismic survey in progress until 01 dec by M/V polar marquis towing 12 8100 meter long cables2018-10-23
- Seismic survey 090001Z jan to 282359Z feb by M/V hugin explorer and M/V ocean europe in area bound by…2017-01-05
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
- Newly discovered dangersWrecks · 26.1 nm
- Dangerous wreck in 04-18.50N 007-02.20EWrecks · 26.1 nm
- Aids to navigationNav aids · 56.5 nm
Worldwide in the collected sources
24 cable & pipeline work listed in force · see all
Record snapshot 2026-10-02 07:34Z; 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.