Surveys

Underwater operations 1000Z to 2000Z daily 12 sep thru 12 oct by M/V silencio IV in: a. 21-50.27S 040-47.80W

Western South Atlantic · Brazil · HYDROLANT 2284/22

issued: 2022-09-11 04:34Z
status: cancelled 2022-10-12 21:00Z (archive)
self-cancels: 2022-10-12 21:00Z
authority: NAVAREA V COASTAL 622/22 110307Z SEP 22.
sea: South Atlantic Ocean
position: -21.823, -40.891
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

WESTERN SOUTH ATLANTIC.
BRAZIL.
DNC 01.
1. UNDERWATER OPERATIONS 1000Z TO 2000Z DAILY
   12 SEP THRU 12 OCT BY M/V SILENCIO IV IN:
   A. 21-50.27S 040-47.80W.
   B. 21-49.83S 040-50.13W.
   C. 21-49.83S 040-51.33W.
   D. 21-47.52S 040-59.28W.
   E. 21-47.85S 040-58.28W.
   F. 21-49.70S 040-58.50W.
   G. 21-50.55S 040-48.70W.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 122100Z OCT 22.

Activity windows · 31 in this warning

opens (UTC)	closes (UTC)	local	length
2022-09-12 10:00Z	2022-09-12 20:00Z	—	10 h
2022-09-13 10:00Z	2022-09-13 20:00Z	—	10 h
2022-09-14 10:00Z	2022-09-14 20:00Z	—	10 h
2022-09-15 10:00Z	2022-09-15 20:00Z	—	10 h
2022-09-16 10:00Z	2022-09-16 20:00Z	—	10 h
2022-09-17 10:00Z	2022-09-17 20:00Z	—	10 h
2022-09-18 10:00Z	2022-09-18 20:00Z	—	10 h
2022-09-19 10:00Z	2022-09-19 20:00Z	—	10 h
… 23 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

646 within 180 nm since 2000 · 23 in the last 12 months · 15 in force now

Season · when survey operations happen here

month of issue, all years in the archive

Nearby now · within 120 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 · 4.4 nm
Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 9 nm
Underwater operations in progress until 312300Z aug by M/V fugro vaquita in area bound by 21-35.43S…Surveys · 9.3 nm
RACON at cabo sao tome light 22-02.52S 041-03.17W off air until 28 sepNav aids · 16 nm
Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 17.7 nm
Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 30.9 nm
Underwater operations in progress until 170259Z aug in 22-22.48S 040-25.05WSurveys · 42.3 nm
Underwater operations 1000Z to 2000Z daily until 02 nov 26 by M/V fugro vaquita in: a. 22-26.32S 040-25.47WSurveys · 45.7 nm
Survey operations in progress until 09 jul 27 by M/V bgp dragon towing 250 meter long cable in area bound by…Surveys · 55.2 nm
Survey operations 10 aug 26 thru 08 mar 27 by tug mce navegacao I in area bound by 22-48.38S 041-08.21W,…Surveys · 61.5 nm
Underwater operations in progress until 140001Z nov by M/V fugro vaquita in area bound by 22-03.00S…Surveys · 89.8 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 · 94.8 nm

Worldwide now

83 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.