Surveys

Survey operations 09 thru 16 jan by M/V pgs apollo towing six 400 meter long cables in area bound by…

South Atlantic Ocean · HYDROLANT 64/23

What this record establishes

Archived notice · 2023-01-17 00:01Z

This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.

Source and dates
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA V 8/23 080119Z JAN 23.. Issued 2023-01-08 03:15Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered
South Atlantic Ocean. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Current notices and reporting history in the South Atlantic Ocean →

issued
2023-01-08 03:15Z
status
Archived notice
self-cancels
2023-01-17 00:01Z
authority
NAVAREA V 8/23 080119Z JAN 23.
NAVAREA
NAVAREA V · named as the source of this relay
sea
South Atlantic Ocean
position
-22.012, -39.711
vessel
M/V PGS APOLLO · 81 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN SOUTH ATLANTIC.
BRAZIL.
DNC 01.
1. SURVEY OPERATIONS 09 THRU 16 JAN
   BY M/V PGS APOLLO TOWING
   SIX 400 METER LONG CABLES
   IN AREA BOUND BY
   21-46.90S 039-24.56W, 21-46.74S 040-00.80W,
   22-05.62S 040-00.93W, 22-06.17S 040-00.63W,
   22-09.14S 040-00.05W, 22-10.75S 040-00.07W,
   22-11.69S 040-00.28W, 22-12.25S 040-00.54W,
   22-12.91S 040-00.98W, 22-14.65S 040-01.00W,
   22-14.81S 039-24.63W.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 170001Z JAN 23.

Reading this warning

DNC (Digital Nautical Chart)
A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
Towed array / streamer
Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
Tow / towing
A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
Area bound by
Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
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 →

Collected reports in this area · survey operations

749 within 180 nm since 2000 · 61 in the last 12 months · 5 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

56 survey operations listed in force · see all

Record snapshot 2026-10-03 08:03Z; 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.