Surveys

Survey operations in progress until further notice by M/V ridley thomas in area bound by 12-26S 041-55E,…

Mozambique Channel · HYDROPAC 771/09

What this record establishes

Archived notice · 2009-05-02 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 VII 78/09 171355Z APR 09.. Issued 2009-04-17 15:41Z. 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
Mozambique Channel. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Mozambique Channel →

issued
2009-04-17 15:41Z
status
Archived notice
authority
NAVAREA VII 78/09 171355Z APR 09.
NAVAREA
NAVAREA VII · named as the source of this relay
sea
Mozambique Channel
position
-16.960, 42.640
vessel
M/V RIDLEY THOMAS · 28 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. SURVEY OPERATIONS IN PROGRESS UNTIL FURTHER NOTICE
   BY M/V RIDLEY THOMAS IN AREA BOUND BY
   12-26S 041-55E, 12-26S 042-05E,
   23-20S 043-29E, 23-20S 043-36E.
   1.5 MILE BERTH REQUESTED.
2. CANCEL HYDROPAC 698/09.

Reading this warning

Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
Until further notice
The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROPAC
The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.

All warning terms →

Collected reports in this area · survey operations

11 within 180 nm since 2003 · 0 in the last 12 months · 0 listed in force now

03
05
10
15
20
21

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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 10:44Z; 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.