Surveys
Underwater operations 1100Z to 2000Z daily 30 jan thru 01 mar by M/V silencio IV in 21-36.56S 040-01.02W
Western South Atlantic · Brazil-southeast Coast · HYDROLANT 330/18
- issued
- 2018-01-29 21:07Z
- status
- cancelled 2018-03-01 21:00Z (archive)
- self-cancels
- 2018-03-01 21:00Z
- authority
- NAVAREA V COASTAL E 96/18 292104Z JAN 18.
- sea
- South Atlantic Ocean
- position
- -21.609, -40.017
- 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 30 JAN THRU 01 MAR BY M/V SILENCIO IV IN 21-36.56S 040-01.02W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 012100Z MAR 18.
Activity windows · 31 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-01-30 11:00Z | 2018-01-30 20:00Z | — | 9 h |
| 2018-01-31 11:00Z | 2018-01-31 20:00Z | — | 9 h |
| 2018-02-01 11:00Z | 2018-02-01 20:00Z | — | 9 h |
| 2018-02-02 11:00Z | 2018-02-02 20:00Z | — | 9 h |
| 2018-02-03 11:00Z | 2018-02-03 20:00Z | — | 9 h |
| 2018-02-04 11:00Z | 2018-02-04 20:00Z | — | 9 h |
| 2018-02-05 11:00Z | 2018-02-05 20:00Z | — | 9 h |
| 2018-02-06 11:00Z | 2018-02-06 20:00Z | — | 9 h |
| … 23 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
617 within 180 nm since 2000 · 24 in the last 12 months · 15 in force now
00
05
10
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
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
- Odas buoy temporarily established until 13 apr 27 in 21-34.20S 040-43.62WNav aids · 39.7 nm
- Survey operations in progress until 09 jul 27 by M/V bgp dragon towing 250 meter long cable in area bound by…Surveys · 39.9 nm
- Underwater operations 281000Z jul to 192100Z aug by M/V umi polaris in area bound by 21-53.65S 040-49.70W,…Surveys · 45.2 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 · 46.5 nm
- Underwater operations in progress until 312300Z aug by M/V fugro vaquita in area bound by 21-35.43S…Surveys · 49.3 nm
- Underwater operations in progress until 170259Z aug in 22-22.48S 040-25.05WSurveys · 51.1 nm
- Underwater operations 1000Z to 2000Z daily until 02 nov 26 by M/V fugro vaquita in: a. 22-26.32S 040-25.47WSurveys · 54.9 nm
- Barra de itabapoana light 21-18.80S 040-57.90W unlit until 08 sep 26Nav aids · 55.9 nm
- RACON at cabo sao tome light 22-02.52S 041-03.17W off air until 28 sepNav aids · 63.3 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 · 73.2 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 · 73.4 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 · 73.4 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.