Surveys
Underwater operations 1100Z to 2100Z daily 21 apr thru 15 may by M/V nm alcmene, M/V proboat and M/V alta…
Western South Atlantic · Brazil-southeast Coast · HYDROLANT 1249/18
- issued
- 2018-04-20 04:20Z
- status
- cancelled 2018-05-15 22:00Z (archive)
- self-cancels
- 2018-05-15 22:00Z
- authority
- NAVAREA V COASTAL E 304/18 200327Z APR 18.
- sea
- South Atlantic Ocean
- position
- -20.310, -40.159
- 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 21 APR THRU 15 MAY BY M/V NM ALCMENE, M/V PROBOAT AND M/V ALTA NAVEGACAO IN 20-18.58S 040-09.55W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 152200Z MAY 18.
Activity windows · 25 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-04-21 11:00Z | 2018-04-21 21:00Z | — | 10 h |
| 2018-04-22 11:00Z | 2018-04-22 21:00Z | — | 10 h |
| 2018-04-23 11:00Z | 2018-04-23 21:00Z | — | 10 h |
| 2018-04-24 11:00Z | 2018-04-24 21:00Z | — | 10 h |
| 2018-04-25 11:00Z | 2018-04-25 21:00Z | — | 10 h |
| 2018-04-26 11:00Z | 2018-04-26 21:00Z | — | 10 h |
| 2018-04-27 11:00Z | 2018-04-27 21:00Z | — | 10 h |
| 2018-04-28 11:00Z | 2018-04-28 21:00Z | — | 10 h |
| … 17 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
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05
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15
20
25
26
- Underwater operations 0800Z to 1800Z daily 21 aug thru 04 sep by M/V capetan vassilis II and M/V comando b…2026-08-20
- Underwater operations 1100Z to 2100Z daily 20 aug thru 03 sep by M/V charlie and M/V comando b in 20-24.27S…2026-08-19
- Underwater operations 1100Z to 2100Z daily 20 aug thru 03 sep by M/V comando b and M/V linden trader in…2026-08-19
- Underwater operations 1100Z to 2100Z daily 20 aug thru 03 sep by M/V hui an and M/V comando b in 20-23.17S…2026-08-19
- Underwater operations 0800Z to 1800Z daily until 28 aug by M/V spar aries and M/V comando b in 20-48.85S…2026-08-18
- Underwater operations 0800Z to 1800Z daily until 29 aug by M/V comando b and M/V am kirti in 20-19.03S…2026-08-18
Season · when survey operations happen here
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F
M
A
M
J
J
A
S
O
N
D
month of issue, all years in the archive
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 · 3.4 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 · 3.7 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 · 4.5 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 · 4.9 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 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 · 5.1 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
- 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 · 27 nm
- Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 75.3 nm
- Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 82.1 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 · 98.8 nm
- Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 101.9 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.