Surveys
Daily underwater operations from 0800 to 1800 UTC, August 23 through September 29, by vessels Comando B and BH Shijiazhuang near 20-23.47S 040-09.88W, wide berth requested.
South Atlantic · Brazil · HYDROLANT 1645/26
- issued
- 2026-08-22 10:57Z
- status
- cancelled 2026-08-24 18:45Z (dropped from inforce)
- self-cancels
- 2026-09-29 19:00Z
- sea
- South Atlantic Ocean
- position
- -20.391, -40.165
- vessels
- M/V BH SHIJIAZHUANG · 2 messagesM/V COMANDO B · 62 messages
- source
- nga_inforce · first seen 2026-08-24 20:02Z
Original warning text
SOUTH ATLANTIC. BRAZIL. 1. UNDERWATER OPERATIONS 0800Z TO 1800Z DAILY 23 AUG THRU 29 SEP BY M/V COMANDO B AND M/V BH SHIJIAZHUANG IN 20-23.47S 040-09.88W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 291900Z SEP 26.
Activity windows · 38 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2026-08-23 08:00Z | 2026-08-23 18:00Z | — | 10 h |
| 2026-08-24 08:00Z | 2026-08-24 18:00Z | — | 10 h |
| 2026-08-25 08:00Z | 2026-08-25 18:00Z | — | 10 h |
| 2026-08-26 08:00Z | 2026-08-26 18:00Z | — | 10 h |
| 2026-08-27 08:00Z | 2026-08-27 18:00Z | — | 10 h |
| 2026-08-28 08:00Z | 2026-08-28 18:00Z | — | 10 h |
| 2026-08-29 08:00Z | 2026-08-29 18:00Z | — | 10 h |
| 2026-08-30 08:00Z | 2026-08-30 18:00Z | — | 10 h |
| … 30 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
574 within 180 nm since 2000 · 35 in the last 12 months · 4 in force now
00
05
10
15
20
25
26
- Underwater operations 1100Z to 2100Z daily 04 thru 18 sep by M/V charlie and M/V comando b in 20-24.27S…2026-09-03
- Underwater operations 1000Z to 2000Z daily 01 thru 30 sep by M/V coral do atlantico in area bound by…2026-09-03
- Underwater operations 1100Z to 2100Z daily 04 thru 18 sep by M/V comando b and M/V linden trader in…2026-09-03
- Underwater operations 1100Z to 2100Z daily 03 thru 17 sep by M/V commander k and M/V comando b in 20-23.90S…2026-09-02
- Underwater operations 0800Z to 1800Z daily 28 aug thru 11 sep by M/V comando b and M/V elati in 20-23.40S…2026-08-27
- Underwater operations 0800Z to 1800Z daily 27 aug thru 10 sep by M/V comando b and M/V angelina the great in…2026-08-26
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
- 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 · 31.7 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 · 94.1 nm
- Underwater operations in progress until 312300Z aug by M/V fugro vaquita in area bound by 21-35.43S…Surveys · 101.1 nm
- RACON at cabo sao tome light 22-02.52S 041-03.17W off air until 28 sepNav aids · 110.9 nm
Worldwide now
70 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.