Surveys

Survey operations are underway in the western South Atlantic near Brazil until August 20, with the vessel Ramform Tethys towing twelve 8000-meter cables.

Western South Atlantic · Brazil · HYDROLANT 1757/23

issued
2023-08-08 23:23Z
status
cancelled 2026-08-14 18:10Z (dropped from inforce)
self-cancels
2023-08-21 00:01Z
cancels
HYDROLANT 1704/23
authority
NAVAREA V 284/23 082112Z AUG 23.
sea
South Atlantic Ocean
position
-27.529, -46.058
source
nga_json · first seen 2026-08-17 13:41Z

Original warning text

WESTERN SOUTH ATLANTIC.
BRAZIL.
DNC 01.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 20 AUG BY
   M/V RAMFORM TETHYS TOWING 12 8000 METER LONG
   CABLES IN AREA BOUND BY
   26-45.04S 044-58.45W, 26-44.55S 046-40.34W,
   26-49.19S 046-41.07W, 27-14.59S 047-06.48W,
   27-28.07S 047-16.30W, 28-14.34S 047-16.30W,
   28-14.39S 044-58.26W.
2. CANCEL HYDROLANT 1704/23.
3. CANCEL THIS MSG 210001Z AUG 23.

This area · survey operations

215 within 180 nm since 1999 · 2 in the last 12 months · 2 in force now

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Season · when survey operations happen here

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month of issue, all years in the archive

Timeline

Nearby now · within 120 nm

Worldwide now

86 survey operations in force · see all

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.