Surveys

Underwater operations 1100Z to 2100Z daily 31 dec thru 14 jan 24 by M/V irmgard and M/V comando b in…

Western South Atlantic · Brazil · HYDROLANT 2985/23

issued: 2023-12-30 23:25Z
status: cancelled 2023-12-31 01:17Z (archive)
self-cancels: 2024-01-14 22:00Z
authority: NAVAREA V COASTAL 765/23 302133Z DEC 23.
sea: South Atlantic Ocean
position: -20.308, -40.252
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

WESTERN SOUTH ATLANTIC.
BRAZIL.
DNC 01.
1. UNDERWATER OPERATIONS 1100Z TO 2100Z DAILY
   31 DEC THRU 14 JAN 24 BY M/V IRMGARD AND
   M/V COMANDO B IN VICINITY PORT OF TUBARAO
   (20-18.50S 040-15.15W). WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 142200Z JAN 24.

Activity windows · 15 in this warning

opens (UTC)	closes (UTC)	local	length
2023-12-31 11:00Z	2023-12-31 21:00Z	—	10 h
2024-01-01 11:00Z	2024-01-01 21:00Z	—	10 h
2024-01-02 11:00Z	2024-01-02 21:00Z	—	10 h
2024-01-03 11:00Z	2024-01-03 21:00Z	—	10 h
2024-01-04 11:00Z	2024-01-04 21:00Z	—	10 h
2024-01-05 11:00Z	2024-01-05 21:00Z	—	10 h
2024-01-06 11:00Z	2024-01-06 21:00Z	—	10 h
2024-01-07 11:00Z	2024-01-07 21:00Z	—	10 h
… 7 more

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

This area · survey operations

545 within 180 nm since 2000 · 15 in the last 12 months · 15 in force now

Season · when survey operations happen here

month of issue, all years in the archive

Timeline

Underwater operations 1100Z to 2100Z daily 31 dec thru 14 jan 24 in 20-23.85S 040-09.63W by M/V irmgard and…cancelled by · 2023-12-31

Nearby now · within 120 nm

Underwater operations 1100Z to 2100Z daily 15 thru 29 aug by M/V comando b and M/V rosco banyan in 20-23.37S…Surveys · 6.4 nm
Underwater operations in progress until 27 aug by M/V navios felix and M/V comando b in 20-22.12S 040-08.38WSurveys · 7.3 nm
Underwater operations 0800Z to 1800Z daily 11 thru 25 aug by M/V comando b and M/V faneromeni in 20-23.00S…Surveys · 7.3 nm
Underwater operations 0800Z to 1800Z daily 02 thru 16 aug by M/V comando b and M/V royal topaz in 20-21.62S…Surveys · 7.4 nm
Underwater operations 1100Z to 2100Z daily 12 thru 21 aug by M/V comando b and M/V faneromeni in 20-23.67S…Surveys · 7.4 nm
Underwater operations 1100Z to 2100Z daily 13 thru 22 aug by M/V comando b and M/V am kirti in 20-23.90S…Surveys · 7.5 nm
Underwater operations 0800Z to 1800Z daily 08 thru 22 aug by M/V marsanne and M/V comando b in 20-23.57S…Surveys · 7.8 nm
Foul ground until 06 dec 27 in area bound by 19-53.87S 039-59.68W, 19-54.15S 039-59.27W, 19-53.08S…Wrecks · 29.3 nm
Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 72.4 nm
Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 80.3 nm
Survey operations in progress until 312200Z aug in area bound by 21-36.17S 041-00.00W, 21-36.05S 040-37.59W,…Surveys · 97 nm
Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 100.3 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.