Surveys

Underwater operations 1600Z to 2000Z daily 27 jul to 30 aug by M/V union mariner and M/V open seas I in…

Western South Atlantic · Brazil-southeast Coast · HYDROLANT 2339/20

issued: 2020-07-25 02:23Z
status: cancelled 2020-08-30 21:00Z (archive)
self-cancels: 2020-08-30 21:00Z
cancels: HYDROLANT 2123/20
authority: NAVAREA V COASTAL E 555/20 250206Z JUL 20.
sea: South Atlantic Ocean
position: -20.321, -40.207
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

WESTERN SOUTH ATLANTIC.
BRAZIL-SOUTHEAST COAST.
DNC 01.
1. UNDERWATER OPERATIONS 1600Z TO 2000Z DAILY
   27 JUL TO 30 AUG BY M/V UNION MARINER AND
   M/V OPEN SEAS I IN 20-19.27S 040-12.42W.
   WIDE BERTH REQUESTED.
2. CANCEL HYDROLANT 2123/20.
3. CANCEL THIS MSG 302100Z AUG 20.

Activity windows · 35 in this warning

opens (UTC)	closes (UTC)	local	length
2020-07-27 16:00Z	2020-07-27 20:00Z	—	4 h
2020-07-28 16:00Z	2020-07-28 20:00Z	—	4 h
2020-07-29 16:00Z	2020-07-29 20:00Z	—	4 h
2020-07-30 16:00Z	2020-07-30 20:00Z	—	4 h
2020-07-31 16:00Z	2020-07-31 20:00Z	—	4 h
2020-08-01 16:00Z	2020-08-01 20:00Z	—	4 h
2020-08-02 16:00Z	2020-08-02 20:00Z	—	4 h
2020-08-03 16:00Z	2020-08-03 20:00Z	—	4 h
… 27 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

554 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 1000Z to 2000Z daily 04 jul to 04 aug by M/V kirana naree and M/V open seas I in…cancels · 2020-07-03
Underwater operations 1000Z to 2000Z daily 04 jul to 04 aug by M/V kirana naree and M/V open seas I in…replaced · 2020-07-03

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 · 4.4 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 · 4.7 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 · 4.8 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 · 4.9 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 · 5.2 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 · 5.3 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 · 5.4 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 · 28.7 nm
Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 73.2 nm
Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 80.4 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 · 97.2 nm
Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 100.4 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.