Surveys
Underwater operations in progress until further notice by M/V deep helder in vicinity of trackline between…
North Sea · Dover Strait · England · HYDROLANT 3775/17
- issued
- 2017-11-23 11:01Z
- status
- cancelled 2017-11-25 15:33Z (archive)
- authority
- WZ 1462/17 231045Z NOV 17.
- position
- 51.314, 1.518
- source
- nga_json · first seen 2026-08-17 13:38Z
Original warning text
NORTH SEA. DOVER STRAIT. ENGLAND. DNC 20. UNDERWATER OPERATIONS IN PROGRESS UNTIL FURTHER NOTICE BY M/V DEEP HELDER IN VICINITY OF TRACKLINE BETWEEN 51-19.2N 001-33.3E AND 51-18.5N 001-28.8E. WIDE BERTH REQUESTED.
This area · survey operations
483 within 180 nm since 1997 · 0 in the last 12 months · 0 in force now
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23
- Survey operations in progress until further notice by M/V mintaka I in vicinity of trackline joining…2023-08-06
- Survey operations 15 sept thru 20 oct by M/V thlassa in vicinity of trackline joining 48-30.00N 006-00.00W,…2022-09-14
- Underwater operations in progress until further notice by M/V uilenspiegel and c/s responder in vicinity of…2022-07-18
- Survey operations in progress until further notice by M/V nora b in vicinity of trackline joining 51-22.80N…2022-07-16
- Survey operations in progress until further notice by M/V nora b in vicinity of trackline joining 50-46.80N…2022-07-12
- Underwater operations in progress until further notice by M/V uilenspiegel in vicinity of trackline joining…2022-07-09
Season · when survey operations happen here
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month of issue, all years in the archive
Timeline
Nearby now · within 120 nm
- Goodwin sands eastwardsNav aids · 6.5 nm
- Sandettie west buoy 51-15.1N 001-54.5E missingNav aids · 15.1 nm
- Turbine G27, 52-19.8N 002-33.5E, fog signal inoperativeNav aids · 72.2 nm
- Mid haisbro buoy 52-54.2N 001-41.6E unlitNav aids · 95.6 nm
- Leman gas fieldNav aids · 107.9 nm
- Platform southwark 53-11.0N 002-05.8E unlit and all navaids inoperativeNav aids · 114.2 nm
Worldwide now
75 survey operations in force · see all
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.