Surveys

Underwater operations 1100Z to 2100Z daily 18 thru 26 oct by M/V cohiba and M/V alta navegacao in 20-22.42S…

Western South Atlantic · Brazil-southeast Coast · HYDROLANT 2739/16

issued: 2016-10-18 18:20Z
status: cancelled 2016-10-26 22:00Z (archive)
self-cancels: 2016-10-26 22:00Z
cancels: HYDROLANT 2735/16
authority: NAVAREA V E 871/16 181732Z OCT 16.
sea: South Atlantic Ocean
position: -20.374, -40.149
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

WESTERN SOUTH ATLANTIC.
BRAZIL-SOUTHEAST COAST.
DNC 01.
1. UNDERWATER OPERATIONS 1100Z TO 2100Z
   DAILY 18 THRU 26 OCT BY M/V COHIBA AND
   M/V ALTA NAVEGACAO IN 20-22.42S 040-08.92W.
2. CANCEL HYDROLANT 2735/16.
3. CANCEL THIS MSG 262200Z OCT 16.

Activity windows · 9 in this warning

opens (UTC)	closes (UTC)	local	length
2016-10-18 11:00Z	2016-10-18 21:00Z	—	10 h
2016-10-19 11:00Z	2016-10-19 21:00Z	—	10 h
2016-10-20 11:00Z	2016-10-20 21:00Z	—	10 h
2016-10-21 11:00Z	2016-10-21 21:00Z	—	10 h
2016-10-22 11:00Z	2016-10-22 21:00Z	—	10 h
2016-10-23 11:00Z	2016-10-23 21:00Z	—	10 h
2016-10-24 11:00Z	2016-10-24 21:00Z	—	10 h
2016-10-25 11:00Z	2016-10-25 21:00Z	—	10 h
… 1 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

561 within 180 nm since 2000 · 24 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 18 thru 26 oct by M/V cohiba and M/V alta navegacao in 20-22.42S…cancels · 2016-10-18
Underwater operations 1100Z to 2100Z daily 18 thru 26 oct by M/V cohiba and M/V alta navegacao in 20-22.42S…replaced · 2016-10-18

Nearby now · within 120 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 · 0.6 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 · 0.6 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 · 1.2 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 · 1.2 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 · 1.3 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 · 1.6 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 · 1.9 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 · 30.4 nm
Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 72.7 nm
Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 78.8 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 · 95.4 nm
Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 98.5 nm

Worldwide now

84 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.