Surveys

Underwater operations 1100Z to 2000Z daily 15 thru 25 sep by M/V nm sbi maia, M/V proboat and M/V alta…

Western South Atlantic · Brazil-southeast Coast · HYDROLANT 2915/18

issued: 2018-09-15 01:17Z
status: cancelled 2018-09-25 21:00Z (archive)
self-cancels: 2018-09-25 21:00Z
cancels: HYDROLANT 2914/18
authority: NAVAREA V COASTAL E 685/18 150106Z SEP 18.
sea: South Atlantic Ocean
position: -20.286, -40.161
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 2000Z DAILY
   15 THRU 25 SEP BY M/V NM SBI MAIA, M/V PROBOAT
   AND M/V ALTA NAVEGACAO IN 20-17.15S 040-09.65W.
   WIDE BERTH REQUESTED.
2. CANCEL HYDROLANT 2914/18.
3. CANCEL THIS MSG 252100Z SEP 18.

Activity windows · 11 in this warning

opens (UTC)	closes (UTC)	local	length
2018-09-15 11:00Z	2018-09-15 20:00Z	—	9 h
2018-09-16 11:00Z	2018-09-16 20:00Z	—	9 h
2018-09-17 11:00Z	2018-09-17 20:00Z	—	9 h
2018-09-18 11:00Z	2018-09-18 20:00Z	—	9 h
2018-09-19 11:00Z	2018-09-19 20:00Z	—	9 h
2018-09-20 11:00Z	2018-09-20 20:00Z	—	9 h
2018-09-21 11:00Z	2018-09-21 20:00Z	—	9 h
2018-09-22 11:00Z	2018-09-22 20:00Z	—	9 h
… 3 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

553 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 2000Z daily 15 thru 25 sep by M/V nm sbi maia, M/V proboat and M/V seamar III…cancels · 2018-09-14
Underwater operations 1100Z to 2000Z daily 15 thru 25 sep by M/V nm sbi maia, M/V proboat and M/V seamar III…replaced · 2018-09-14

Nearby now · within 120 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 · 4.7 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 · 5.1 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 · 5.9 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 · 6.3 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 · 6.5 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 · 6.5 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 · 6.8 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 · 25.7 nm
Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 76.4 nm
Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 83.4 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 · 100.1 nm
Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 103.2 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.