Survey operations 09 may thru 30 sep by M/V ramform tethys towing 16 8100 meter long cables in area bound by…
South Atlantic Ocean · HYDROLANT 1437/18
What this record establishes
Archived notice · 2018-10-01 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 V COASTAL E 352/18 080254Z MAY 18.. Issued 2018-05-08 07:13Z. 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.
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2018-05-08 07:13Z
- status
- Archived notice
- authority
- NAVAREA V COASTAL E 352/18 080254Z MAY 18.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V COASTAL E
- sea
- South Atlantic Ocean
- position
- -11.151, -35.767
- vessel
- M/V RAMFORM TETHYS · 111 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. BRAZIL-EAST COAST. DNC 01. 1. SURVEY OPERATIONS 09 MAY THRU 30 SEP BY M/V RAMFORM TETHYS TOWING 16 8100 METER LONG CABLES IN AREA BOUND BY 10-52.05S 035-08.36W, 11-10.44S 035-03.60W, 11-53.92S 035-41.84W, 11-30.75S 036-24.94W, 11-16.14S 036-10.35W, 10-52.06S 036-24.99W, 10-51.19S 036-23.93W, 10-49.33S 036-21.66W, 10-45.92S 036-20.23W, 10-44.81S 036-19.11W, 10-43.82S 036-16.61W, 10-41.19S 036-13.31W, 10-38.03S 036-09.29W, 10-36.54S 036-07.32W, 10-32.81S 036-03.71W, 10-29.61S 036-01.53W, 10-28.10S 036-00.46W, 10-26.47S 035-56.29W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 01 OCT 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.
- 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
36 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.
- Survey operations 270500Z feb to 252100Z mar by M/V sable in area bound by 10-44.76S 036-33.13W, 10-44.53S…2020-02-27
- Underwater operations 160700Z to 161500Z sep by tug mar de espanha, M/V macau, M/V grauna and M/V nb…2019-09-15
- Underwater operations in progress until 150359Z feb 15 in area bound by 11-15.51S 036-59.70W, 11-14.58S…2014-08-21
- Hydrographic survey 09 thru 12 may by M/V sirius in area bound by 10-42S 036-27W, 10-31S 036-07W, 10-51S…2011-05-06
- Survey operations 131100Z to 151000Z oct by M/V albardao and M/V aracatuba in area bound by 08-09.1S…2010-10-11
- Survey operations 250600Z oct to 092100Z nov by M/V gyre in area bound by 10-07.07S 036-06.22W, 10-19.15S…2008-10-24
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
- Maceio light 09-41.03S 035-43.38W unlit until 31 octNav aids · 88.1 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-03 03:08Z; 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.