Surveys
Underwater operations in progress sunrise to sunset until 221800Z nov by M/V thalassa within 20 miles of: a.…
HYDROLANT 2490/99
- issued
- 1999-11-21 00:06Z
- status
- cancelled 1999-11-22 19:00Z (archive)
- self-cancels
- 1999-11-22 19:00Z
- authority
- WZ 2071/99 202316Z NOV 99
- sea
- Celtic Sea
- position
- 51.417, -6.583
- source
- nga_json · first seen 2026-08-17 13:38Z
Original warning text
1. UNDERWATER OPERATIONS IN PROGRESS SUNRISE TO SUNSET UNTIL 221800Z NOV BY M/V THALASSA WITHIN 20 MILES OF: A. 51-30N 007-00W ON 21 NOV. B. 51-20N 006-10W ON 22 NOV. 2. CANCEL THIS MSG 221900Z NOV.
This area · survey operations
691 within 180 nm since 1999 · 0 in the last 12 months · 0 in force now
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- Survey operations in progress until 20 jul by M/V celtic explorer in vicinity of trackline joining 47-30.00N…2023-06-14
- Underwater operations 180800Z to 192200Z nov by M/V willchallenge in vicinity of 50-19.0N 004-14.7W2022-11-17
- Underwater operations in progress until further notice by unmanned submersible ALR4 in vicinity of trackline…2022-06-10
- Underwater operations in progress until further notice by submersible in vicinity of trackline joining…2022-05-10
- Survey operations in progress until further notice by M/V sw bly towing four 2300 meter long cables, marked…2022-05-08
- Survey operations in progress until further notice by M/V sw bly towing four 2300 meter long cables, marked…2022-04-17
Season · when survey operations happen here
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month of issue, all years in the archive
Nearby now · within 120 nm
- Fowey light 50-19.60N 004-38.90W unreliableNav aids · 98.3 nm
Worldwide now
84 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.