Surveys

Survey operations 30 mar thru 27 apr by M/V sirius H-21 in area between 17-10S 18-50S and 036-50W 038-10W

HYDROLANT 562/05

What this record establishes

Archived notice · 2005-04-28 00:00Z

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 287/05 290406Z MAR 05.. Issued 2005-03-29 04:40Z. 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
No named location parsed. No usable coordinates were parsed; a location-based nearby search is unavailable. Check the original wording for limits and qualifications.

Related notices and cancellation links

issued
2005-03-29 04:40Z
status
Archived notice
authority
NAVAREA V 287/05 290406Z MAR 05.
NAVAREA
NAVAREA V · named as the source of this relay
vessel
M/V SIRIUS H-21 · 2 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. SURVEY OPERATIONS 30 MAR THRU 27 APR
   BY M/V SIRIUS H-21 IN AREA BETWEEN
   17-10S 18-50S AND 036-50W 038-10W.
2. CANCEL HYDROLANT 554/05.
3. CANCEL THIS MSG 28 APR.

Reading this warning

Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROLANT
The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
CANCEL THIS MSG
The warning's own expiry: a line telling the reader when the message cancels itself.

All warning terms →

Nearby notices listed in force · within 120 nm

No parsed position is available for this comparison.

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-03 07:12Z; 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.