Hydrographic survey 09 thru 12 may by M/V sirius in area bound by 10-42S 036-27W, 10-31S 036-07W, 10-51S…
South Atlantic Ocean · HYDROLANT 766/11
What this record establishes
Archived notice · 2011-05-13 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 E 390/11 06 MAY 11 - NAVAREA V SAR 50/11 06 MAY 11.. Issued 2011-05-06 04:58Z. 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.
Related notices and cancellation links
- Vessel rio de la plata reports crewman requiring medical assistance in 19-45.9S 039-10.8Wcancelled by this notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2011-05-06 04:58Z
- status
- Archived notice
- authority
- NAVAREA V E 390/11 06 MAY 11 - NAVAREA V SAR 50/11 06 MAY 11.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V E
- sea
- South Atlantic Ocean
- position
- -10.816, -36.073
- vessel
- M/V SIRIUS · 43 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
BRAZIL-EAST COAST. 1. HYDROGRAPHIC SURVEY 09 THRU 12 MAY BY M/V SIRIUS IN AREA BOUND BY 10-42S 036-27W, 10-31S 036-07W, 10-51S 035-45W, 11-10S 035-57W. 2. CANCEL HYDROLANT 763/11. 3. CANCEL THIS MSG 13 MAY.
Reading this warning
- 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.
- 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.
Collected reports in this area · survey operations
35 within 180 nm since 2000 · 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.
- Survey operations 270500Z feb to 252100Z mar by M/V sable in area bound by 10-44.76S 036-33.13W, 10-44.53S…2020-02-27
- Underwater operations 160700Z to 161500Z sep by tug mar de espanha, M/V macau, M/V grauna and M/V nb…2019-09-15
- Survey operations 09 may thru 30 sep by M/V ramform tethys towing 16 8100 meter long cables in area bound by…2018-05-08
- Underwater operations in progress until 150359Z feb 15 in area bound by 11-15.51S 036-59.70W, 11-14.58S…2014-08-21
- Survey operations 131100Z to 151000Z oct by M/V albardao and M/V aracatuba in area bound by 08-09.1S…2010-10-11
- Survey operations 250600Z oct to 092100Z nov by M/V gyre in area bound by 10-07.07S 036-06.22W, 10-19.15S…2008-10-24
Month of issue in the collected archive
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
- Maceio light 09-41.03S 035-43.38W unlit until 31 octNav aids · 71 nm
Worldwide in the collected sources
55 survey operations listed in force · see all
Record snapshot 2026-09-27 01:07Z; 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.