Surveys

Underwater operations 16 feb thru 23 mar by M/V thalassa in area bound by 00-00S 023-00W, 00-00S 000-00W,…

South Atlantic · HYDROLANT 520/20

issued: 2020-02-13 13:09Z
status: cancelled 2020-02-18 11:49Z (archive)
cancels: HYDROLANT 510/20
authority: NAVAREA VII 43/20 131121Z FEB 20.
sea: South Atlantic Ocean
position: -5.792, -12.896
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

SOUTH ATLANTIC.
DNC 01.
1. UNDERWATER OPERATIONS 16 FEB THRU 23 MAR
   BY M/V THALASSA IN AREA BOUND BY
   00-00S 023-00W, 00-00S 000-00W,
   06-00S 010-00W, 20-00S 010-00W.
   WIDE BERTH REQUESTED.
2. CANCEL HYDROLANT 510/20.
3. CANCEL THIS MSG 24 MAR 20.

This area · survey operations

2 within 180 nm since 2020 · 0 in the last 12 months · 0 in force now

Underwater operations 25 feb thru 07 apr by M/V thalassa in: a. 00-00S 010-00W2022-02-22

Season · when survey operations happen here

month of issue, all years in the archive

Timeline

Underwater operations 16 feb thru 23 mar by M/V thalassa in area bound by 00-00S 010-00W, 00-00S 000-00W,…cancels · 2020-02-12
Underwater operations 16 feb thru 23 mar by M/V thalassa in area bound by 00-00S 010-00W, 00-00S 000-00W,…replaced · 2020-02-12
Cancel HYDROLANT 520/20(24,57)cancelled by · 2020-02-18

Nearby now · within 120 nm

Nothing else in force 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.