Underwater operations 1100Z to 1900Z daily 15 thru 22 jun by M/V texas and M/V seamaster I in 05-42.08S…
South Atlantic Ocean · HYDROLANT 1599/21
What this record establishes
Archived notice · 2021-06-17 09:41Z
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 COASTAL E 443/21 142120Z JUL 21.. Issued 2021-06-14 21:23Z. 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 parsed report position is -5.701, -35.075. 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
- Cancel HYDROLANT 1599/21 and this msglater cancellation notice
Current notices and reporting history in the South Atlantic Ocean →
Activity windows · 8 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2021-06-15 11:00Z | 2021-06-15 19:00Z | — | 8 h |
| 2021-06-16 11:00Z | 2021-06-16 19:00Z | — | 8 h |
| 2021-06-17 11:00Z | 2021-06-17 19:00Z | — | 8 h |
| 2021-06-18 11:00Z | 2021-06-18 19:00Z | — | 8 h |
| 2021-06-19 11:00Z | 2021-06-19 19:00Z | — | 8 h |
| 2021-06-20 11:00Z | 2021-06-20 19:00Z | — | 8 h |
| 2021-06-21 11:00Z | 2021-06-21 19:00Z | — | 8 h |
| 2021-06-22 11:00Z | 2021-06-22 19:00Z | — | 8 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2021-06-14 21:23Z
- status
- Archived notice
- self-cancels
- 2021-06-22 20:00Z
- authority
- NAVAREA V COASTAL E 443/21 142120Z JUL 21.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V COASTAL E
- sea
- South Atlantic Ocean
- position
- -5.701, -35.075
- vessels
- M/V SEAMASTER I · 2 messagesM/V TEXAS · 2 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. BRAZIL-NORTHEAST COAST. DNC 01. 1. UNDERWATER OPERATIONS 1100Z TO 1900Z DAILY 15 THRU 22 JUN BY M/V TEXAS AND M/V SEAMASTER I IN 05-42.08S 035-04.50W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 222000Z JUN 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.
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- 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.
- 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.
Collected reports in this area · survey operations
66 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 in progress until 241000Z apr by M/V taurus in area bound by 06-56.53S 034-49.48W,…2024-03-16
- Survey operations in progress until 092100Z mar by M/V taurus in area bound by 06-50.45S 034-45.38W,…2024-03-05
- Underwater operations 0800Z to 2100Z daily 05 sep thru 05 mar 23 by M/V paracuru in 04-52.42S 036-22.45W2022-09-05
- Underwater operations 1100Z to 1900Z daily 01 thru 06 jun by M/V texas and M/V seamaster I in 05-42.08S…2021-05-31
- Survey operations in progress until 15 apr by M/V ocean dream and M/V bgp pioneer eco warrior each towing…2020-03-16
- Survey operations 03 thru 13 mar by M/V bgp pioneer towing 12500 meter long cable in area bound by 04-34.47S…2020-03-03
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
- Odas buoy established in 05-09.46S 035-09.81WNav aids · 33.1 nm
- Odas buoy bravo rn-l temporarily established until 20 oct in 04-53.00S 035-46.01WNav aids · 64.2 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-03 02:06Z; 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.