Surveys
Underwater operations by vessels Spar Aries and Comando B occur daily from 1100Z to 2100Z, 18-28 August, at 20-48.85S 040-27.23W, wide berth requested.
South Atlantic · Brazil · HYDROLANT 1592/26
- issued
- 2026-08-17 09:00Z
- status
- cancelled 2026-08-19 18:30Z (dropped from inforce)
- self-cancels
- 2026-08-28 22:00Z
- sea
- South Atlantic Ocean
- position
- -20.814, -40.454
- source
- nga_inforce · first seen 2026-08-19 19:02Z
Original warning text
SOUTH ATLANTIC. BRAZIL. 1. UNDERWATER OPERATIONS 1100Z TO 2100Z DAILY 18 THRU 28 AUG BY M/V SPAR ARIES AND M/V COMANDO B IN 20-48.85S 040-27.23W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 282200Z AUG 26.
Activity windows · 11 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2026-08-18 11:00Z | 2026-08-18 21:00Z | — | 10 h |
| 2026-08-19 11:00Z | 2026-08-19 21:00Z | — | 10 h |
| 2026-08-20 11:00Z | 2026-08-20 21:00Z | — | 10 h |
| 2026-08-21 11:00Z | 2026-08-21 21:00Z | — | 10 h |
| 2026-08-22 11:00Z | 2026-08-22 21:00Z | — | 10 h |
| 2026-08-23 11:00Z | 2026-08-23 21:00Z | — | 10 h |
| 2026-08-24 11:00Z | 2026-08-24 21:00Z | — | 10 h |
| 2026-08-25 11:00Z | 2026-08-25 21:00Z | — | 10 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
590 within 180 nm since 2000 · 23 in the last 12 months · 15 in force now
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05
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15
20
25
26
- 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
- Underwater operations 0800Z to 1800Z daily 16 thru 30 aug by MV white defender and comando b in vicinity…2026-08-15
Season · when survey operations happen here
J
F
M
A
M
J
J
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N
D
month of issue, all years in the archive
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 · 29.8 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 · 29.9 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 · 30.2 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 · 30.6 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 · 31 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 · 32.1 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 · 32.7 nm
- Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 41.5 nm
- Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 47.9 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 · 61.4 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 · 64.6 nm
- Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 68.1 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.