Surveys

Survey operations 050400Z thru 170500Z nov by M/V atlantis with submersible alvin in areas within: a. 60…

North Atlantic Ocean · NAVAREA IV 990/21

What this record establishes

Archived notice · 2021-11-09 13:24Z

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) · NATIONAL DEEP SUBMERGENCE FACILITY 301317Z OCT 21.. Issued 2021-10-30 13:29Z. 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
North Atlantic Ocean. The parsed report position is 25.037, -64.993. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the North Atlantic Ocean →

issued
2021-10-30 13:29Z
status
Archived notice
self-cancels
2021-11-17 06:00Z
authority
NATIONAL DEEP SUBMERGENCE FACILITY 301317Z OCT 21.
NAVAREA
NAVAREA IV
issued by
NATIONAL DEEP SUBMERGENCE FACILITY
sea
North Atlantic Ocean
position
25.037, -64.993
vessel
M/V ATLANTIS · 37 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN NORTH ATLANTIC.
PUERTO RICO.
1. SURVEY OPERATIONS 050400Z THRU 170500Z NOV
   BY M/V ATLANTIS WITH SUBMERSIBLE ALVIN
   IN AREAS WITHIN:
   A. 60 MILES OF 30-00N 064-08W.
   B. 20 MILES OF 27-45N 064-30W.
   C. 20 MILES OF 24-56N 064-44W.
   D. 20 MILES OF 22-52N 065-33W.
   E. 60 MILES OF 19-38N 066-03W.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 170600Z NOV 21.

Reading this warning

Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
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.

All warning terms →

Collected reports in this area · survey operations

1 within 180 nm since 2021 · 0 in the last 12 months · 0 listed in force now

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

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-03 18:43Z; 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.