Survey operations in progress until 05 jun by M/V ramform tethys towing 16 9300 meter long cables in area…
South Atlantic Ocean · HYDROLANT 1706/18
What this record establishes
Archived notice · 2018-06-06 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 113/18 310230Z MAY 18.. Issued 2018-05-31 09:18Z. 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
- 2018-05-31 09:18Z
- status
- Archived notice
- authority
- NAVAREA V 113/18 310230Z MAY 18.
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -7.040, -35.110
- 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-NORTHEAST COAST. DNC 01. 1. SURVEY OPERATIONS IN PROGRESS UNTIL 05 JUN BY M/V RAMFORM TETHYS TOWING 16 9300 METER LONG CABLES IN AREA BOUND BY 04-12.85S 036-13.50W, 04-33.00S 034-21.00W, 07-50.50S 033-59.60W, 09-41.70S 034-38.20W, 10-37.90S 035-36.20W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 06 JUN 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
58 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 in progress until 241000Z apr by M/V taurus in area bound by 06-56.53S 034-49.48W,…2024-03-16
- Survey operations in progress until 092100Z mar by M/V taurus in area bound by 06-50.45S 034-45.38W,…2024-03-05
- Underwater operations 0800Z to 2100Z daily 05 sep thru 05 mar 23 by M/V paracuru in 04-52.42S 036-22.45W2022-09-05
- Underwater operations 1100Z to 1900Z daily 15 thru 22 jun by M/V texas and M/V seamaster I in 05-42.08S…2021-06-14
- Underwater operations 1100Z to 1900Z daily 01 thru 06 jun by M/V texas and M/V seamaster I in 05-42.08S…2021-05-31
- Survey operations in progress until 15 apr by M/V ocean dream and M/V bgp pioneer eco warrior each towing…2020-03-16
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
- Tamandare light 08-45.57S 035-06.08W unlit until 02 novNav aids · 103.3 nm
- Odas buoy established in 05-09.46S 035-09.81WNav aids · 113 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-03 03:45Z; 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.