Surveys

Underwater operations by vessel Comando B occur daily 0800-1800 UTC 26 September through 10 October off Brazil at 20-23.78S 040-09.43W, requesting wide berth; cancel 10 October 1900 UTC.

South Atlantic Ocean · HYDROLANT 1899/26

What this record establishes

Listed in force

The latest collected record lists this warning as active. This is the status of the notice, not a live observation of conditions at the location.

Source and dates
NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-09-25 09:40Z. First collected 2026-09-25 18:17Z; last seen in collection 2026-09-25 21:47Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered
South Atlantic Ocean. The parsed report position is -20.396, -40.157. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Current notices and reporting history in the South Atlantic Ocean →

Activity windows · 15 in this warning

opens (UTC)closes (UTC)locallength
2026-09-26 08:00Z2026-09-26 18:00Z—10 h
2026-09-27 08:00Z2026-09-27 18:00Z—10 h
2026-09-28 08:00Z2026-09-28 18:00Z—10 h
2026-09-29 08:00Z2026-09-29 18:00Z—10 h
2026-09-30 08:00Z2026-09-30 18:00Z—10 h
2026-10-01 08:00Z2026-10-01 18:00Z—10 h
2026-10-02 08:00Z2026-10-02 18:00Z—10 h
2026-10-03 08:00Z2026-10-03 18:00Z—10 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.

issued
2026-09-25 09:40Z
status
Listed in force
self-cancels
2026-10-10 19:00Z
sea
South Atlantic Ocean
position
-20.396, -40.157
nearest port
Vitoria · 11 nm
source
NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-09-25 18:17Z

Original warning text

SOUTH ATLANTIC.
BRAZIL.
1. UNDERWATER OPERATIONS 0800Z TO 1800Z
   DAILY 26 SEP THRU 10 OCT BY M/V COMANDO B
   IN 20-23.78S 040-09.43W.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 101900Z OCT 26.

Reading this warning

Underwater operations
Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
Position (degrees and minutes)
How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
Wide berth requested
Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
CANCEL THIS MSG
The warning's own expiry: a line telling the reader when the message cancels itself.
Date-time group (DTG)
A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.

All warning terms →

Conditions at the position · now

loading…

MET Norway · NOAA WaveWatch III · HYCOM · GEBCO 2020 · model data at the centroid, not an observation

Collected reports in this area · survey operations

594 within 180 nm since 2000 · 55 in the last 12 months · 4 listed in force now

00
05
10
15
20
25
26

Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.

Month of issue in the collected archive

J
F
M
A
M
J
J
A
S
O
N
D

All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.

Nearby notices listed in force · within 120 nm

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-09-25 21:54Z; source collection times vary.

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.