Surveys
Underwater operations 1100Z to 2000Z daily 16 thru 23 dec by M/V great vanguard in 24-11S 046-21W
Western South Atlantic · Brazil-southeast Coast · HYDROLANT 3081/21
- issued
- 2021-12-17 00:22Z
- status
- cancelled 2021-12-23 21:00Z (archive)
- self-cancels
- 2021-12-23 21:00Z
- authority
- NAVAREA V COASTAL S 890/21 162327Z DEC 21.
- sea
- South Atlantic Ocean
- position
- -24.183, -46.350
- 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 16 THRU 23 DEC BY M/V GREAT VANGUARD IN 24-11S 046-21W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 232100Z DEC 21.
Activity windows · 8 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2021-12-16 11:00Z | 2021-12-16 20:00Z | — | 9 h |
| 2021-12-17 11:00Z | 2021-12-17 20:00Z | — | 9 h |
| 2021-12-18 11:00Z | 2021-12-18 20:00Z | — | 9 h |
| 2021-12-19 11:00Z | 2021-12-19 20:00Z | — | 9 h |
| 2021-12-20 11:00Z | 2021-12-20 20:00Z | — | 9 h |
| 2021-12-21 11:00Z | 2021-12-21 20:00Z | — | 9 h |
| 2021-12-22 11:00Z | 2021-12-22 20:00Z | — | 9 h |
| 2021-12-23 11:00Z | 2021-12-23 20:00Z | — | 9 h |
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
195 within 180 nm since 1999 · 1 in the last 12 months · 0 in force now
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25
26
- Underwater operations 1000Z to 2000Z daily until 25 aug by vessel nomar in 24-07.27S 046-09.30W2026-08-20
- Underwater operations 0500Z to 2000Z daily 16 thru 25 apr by M/V double diamond and M/V novo estado in…2024-04-16
- Underwater operations 1100Z to 2000Z daily 06 apr thru 05 may in 24-07.11S 046-08.76W2024-04-06
- Underwater operations 1100Z to 2000Z daily 28 feb thru 26 mar by M/V big john VI, M/V rodrigo neto I and M/V…2024-02-28
- Underwater operations in progress until 072000Z mar in 24-09.24S 046-12.68W2024-02-08
- Underwater operations 071100Z feb to 062000Z mar in 24-10.04S 046-14.53W2024-02-07
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
- Laje da conceicao light 24-14.18S 046-41.46W unlit until 24 sepNav aids · 18.9 nm
- Odas buoy established in 24-06.36S 045-38.78WNav aids · 38.8 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.