Surveys
Underwater operations occur daily 0800 to 1700 UTC from 17 September to 1 October in the South Atlantic off Brazil at 20-23.85S 040-09.08W, and vessels should keep clear.
South Atlantic · Brazil · HYDROLANT 1843/26
- issued
- 2026-09-17 01:30Z
- status
- cancelled 2026-09-17 14:30Z (dropped from inforce)
- self-cancels
- 2026-10-01 18:00Z
- sea
- South Atlantic Ocean
- position
- -20.398, -40.151
- source
- nga_inforce · first seen 2026-09-18 06:18Z
Original warning text
SOUTH ATLANTIC. BRAZIL. 1. UNDERWATER OPERATIONS 0800Z TO 1700Z DAILY 17 SEP THRU 01 OCT BY M/V TOP WEATHER AND M/V COMANDO B IN 20-23.85S 040-09.08W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 011800Z OCT 26.
Activity windows · 15 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2026-09-17 08:00Z | 2026-09-17 17:00Z | — | 9 h |
| 2026-09-18 08:00Z | 2026-09-18 17:00Z | — | 9 h |
| 2026-09-19 08:00Z | 2026-09-19 17:00Z | — | 9 h |
| 2026-09-20 08:00Z | 2026-09-20 17:00Z | — | 9 h |
| 2026-09-21 08:00Z | 2026-09-21 17:00Z | — | 9 h |
| 2026-09-22 08:00Z | 2026-09-22 17:00Z | — | 9 h |
| 2026-09-23 08:00Z | 2026-09-23 17:00Z | — | 9 h |
| 2026-09-24 08:00Z | 2026-09-24 17:00Z | — | 9 h |
| … 7 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
586 within 180 nm since 2000 · 47 in the last 12 months · 2 in force now
00
05
10
15
20
25
26
- Underwater operations in progress until 240259Z sep by M/V siem pilot in 22-25.32S 039-56.55W2026-09-17
- Underwater operations 0800Z to 1800Z daily 17 sep thru 01 oct by M/V fj iris and M/V comando b in 20-23.72S…2026-09-17
- Underwater operations 0800Z to 1800Z daily until 25 sep by M/V altair sky and M/V comando b in 20-23.02S…2026-09-14
- Underwater operations 0800Z to 1800Z daily until 25 sep by M/V somnium australis and M/V comando b in…2026-09-14
- Underwater operations 0800Z to 1800Z daily until 28 sep by M/V comando b and M/V shandong fu xin in…2026-09-14
- Underwater operations 0800Z to 1800Z daily 13 thru 27 sep by M/V comando b and M/V ionic smyrni in 20-23.05S…2026-09-12
Season · when survey operations happen here
J
F
M
A
M
J
J
A
S
O
N
D
month of issue, all years in the archive
Nearby now · within 120 nm
Worldwide now
52 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.