Survey operations are underway in the Bay of Bengal off India from 28 September to 9 November by the vessel SW Duchess, which requests a two-mile berth.
Bay of Bengal · HYDROPAC 2801/26
What this record establishes
Cancelled notice · 2026-09-28 16:45Z
This notice disappeared from the issuing source's in-force list. No explicit recovery or all-clear is established by that removal.
- Source and dates
- NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-09-27 10:17Z. First collected 2026-09-28 19:02Z; last seen in collection 2026-09-29 03:17Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Bay of Bengal. 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 Bay of Bengal →
- issued
- 2026-09-27 10:17Z
- status
- Cancelled notice
- self-cancels
- 2026-11-10 00:01Z
- sea
- Bay of Bengal
- position
- 13.700, 81.325
- source
- NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-09-28 19:02Z
Original warning text
BAY OF BENGAL. INDIA. 1. SURVEY OPERATIONS 28 SEP THRU 09 NOV BY M/V SW DUCHESS IN AREA BOUND BY 14-12.00N 081-13.00E, 13-34.00N 081-51.00E, 13-12.00N 081-26.00E, 13-50.00N 080-48.00E. TWO MILE BERTH REQUESTED. 2. CANCEL THIS MSG 100001Z NOV 26.
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.
- 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
128 within 180 nm since 2001 · 7 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 10 sep thru 21 oct by M/V lay vessel 108 in area bound by 16-31.55N 082-18.71E, 16-31.52N…2026-09-09
- Survey operations 06 thru 30 apr by M/V coastal triumph in area bound by 11-15.00N 079-58.30E, 11-19.30N…2026-04-02
- Survey operations 11 jan thru 10 feb by M/V albatross 37 in areas bound by: a. 14-39.10N 082-33.23E,…2026-01-08
- Survey operations in progress until 24 jan in area bound by 11-34.59N 079-53.55E, 11-34.29N 079-54.04E,…2026-01-06
- Survey operations 30 nov to 30 dec by M/V sambhavya in area bound by 16-15.94N 081-16.99E, 16-13.50N…2025-11-29
- Survey operations 25 nov thru 31 dec by an acoustic doppler current profiler in area bound by 13-20.44N…2025-11-21
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
- Buoy established in 14-05.21N 080-28.50ENav aids · 54.7 nm
- Hazardous operations 290830Z to 290930Z sep in area bound by 13-07.02N 080-18.01E, 13-14.90N 080-25.98E,…Exercises · 62.1 nm
Worldwide in the collected sources
54 survey operations listed in force · see all
Record snapshot 2026-09-29 03:17Z; 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.