Surveys

Survey operations 09 jul thru 30 sep by M/V bourbon evolution 802 and M/V veritas viking in area bound by…

Gulf of Guinea · HYDROLANT 1764/21

What this record establishes

Archived notice · 2021-10-01 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 II 253/21 051412Z JUL 21.. Issued 2021-07-05 15:21Z. 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
Gulf of Guinea. 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 Gulf of Guinea →

issued
2021-07-05 15:21Z
status
Archived notice
authority
NAVAREA II 253/21 051412Z JUL 21.
NAVAREA
NAVAREA II · named as the source of this relay
sea
Gulf of Guinea
position
3.087, 6.679
vessels
M/V BOURBON EVOLUTION 802 · 2 messagesM/V VERITAS VIKING · 59 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

GULF OF GUINEA.
SAO TOME AND PRINCIPE.
DNC 01.
1. SURVEY OPERATIONS 09 JUL THRU 30 SEP BY
   M/V BOURBON EVOLUTION 802 AND M/V VERITAS VIKING
   IN AREA BOUND BY
   03-03.05N 006-28.28E, 03-15.07N 006-44.31E,
   03-04.54N 006-55.67E, 02-56.38N 006-28.20E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 01 OCT 21.

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.
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.

All warning terms →

Collected reports in this area · survey operations

38 within 180 nm since 2002 · 2 in the last 12 months · 1 listed in force now

02
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 17:04Z; 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.