Survey operations 06 jun thru 30 sep by M/V bgp prospector towing ten 8000 meter long cables in area bound…
Gulf of Guinea · HYDROLANT 1503/21
What this record establishes
Archived notice · 2021-09-24 02:55Z
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 220/21 050321Z JUN 21.. Issued 2021-06-05 04:02Z. 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
- Cancel HYDROLANT 1503/21 and this msg, operations completedlater cancellation notice
Current notices and reporting history in the Gulf of Guinea →
- issued
- 2021-06-05 04:02Z
- status
- Archived notice
- authority
- NAVAREA II 220/21 050321Z JUN 21.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- Gulf of Guinea
- position
- 2.330, 7.009
- vessel
- M/V BGP PROSPECTOR · 75 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
GULF OF GUINEA. SAO TOME AND PRINCIPE. DNC 01. 1. SURVEY OPERATIONS 06 JUN THRU 30 SEP BY M/V BGP PROSPECTOR TOWING TEN 8000 METER LONG CABLES IN AREA BOUND BY 02-24N 006-12E, 03-05N 007-17E, 02-15N 007-49E, 01-35N 006-44E. SEVEN MILE BERTH REQUESTED. 2. CANCEL THIS MSG 01 OCT 21.
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.
- 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 · survey operations
38 within 180 nm since 2003 · 2 in the last 12 months · 1 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.
- Last known positions of mobile oil rigs and drill ships at 040430 UTC sep 262026-09-04
- Last known positions of mobile oil rigs and drill ships at 091630 UTC aug 262026-08-09
- Survey operations in progress until 22 apr by M/V borda in area bound by 03-44.80N 009-21.70E, 03-52.20N…2024-04-14
- Survey operations in progress until 09 apr by M/V borda in area bound by 03-44.8N 009-21.7E, 03-52.2N…2024-04-03
- Survey operations 27 mar thru 15 may by M/V rem saltire and M/V bgp dragon in area bound by 03-06.80N…2024-03-24
- Survey operations 12 feb thru 26 mar by M/V bgp dragon and M/V rem saltire in area bound by 03-17.54N…2024-02-09
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
- Aids to navigationNav aids · 109.9 nm
- Newly discovered dangersWrecks · 118.8 nm
- Dangerous wreck in 04-18.50N 007-02.20EWrecks · 118.8 nm
Worldwide in the collected sources
55 survey operations listed in force · see all
Record snapshot 2026-10-02 06:41Z; source collection times vary.
Surveys
Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →
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.