Surveys
Underwater operations in progress sunrise to sunset until 191800Z nov by M/V thalassa within 20 miles of: a.…
HYDROLANT 2473/99
- issued
- 1999-11-18 09:55Z
- status
- cancelled 1999-11-19 14:19Z (archive)
- self-cancels
- 1999-11-19 19:00Z
- cancels
- HYDROLANT 2393/99HYDROLANT 2463/99
- authority
- WZ 2059/99 180916Z NOV 99; WZ 2958/99
- sea
- Celtic Sea
- position
- 50.750, -9.500
- source
- nga_json · first seen 2026-08-17 13:38Z
Original warning text
1. UNDERWATER OPERATIONS IN PROGRESS SUNRISE TO SUNSET UNTIL 191800Z NOV BY M/V THALASSA WITHIN 20 MILES OF: A. 51-00N 010-00W ON 18 NOV. B. 50-30N 009-00W ON 19 NOV. 2. CANCEL HYDROLANT 2393/99(37), OPERATIONS COMPLETED. 3. CANCEL HYDROLANT 2463/99. 4. CANCEL THIS MSG 191900Z NOV.
This area · survey operations
450 within 180 nm since 1999 · 0 in the last 12 months · 0 in force now
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23
- Survey operations in progress until 20 jul by M/V celtic explorer in vicinity of trackline joining 47-30.00N…2023-06-14
- Survey operations 072201Z to 112159Z jun by vessel nanoplon in area within one mile of 48-20.67N 008-22.08W2023-06-06
- 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 18 jan thru 01 feb by M/V beautemps beaupre in areas bound by: a. 48-12N 008-15W, 48-07N…2021-01-15
- Survey operations in progress until further notice by M/V ridley thomas along trackline joining 48-29.2N…2020-08-30
Season · when survey operations happen here
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month of issue, all years in the archive
Timeline
- Cable operations in progress until further notice by M/V toisa puma vicinity 52-28N 002-11Ereplaced · 1999-11-09
- Underwater operations in progress sunrise to sunset until 181800Z nov by M/V thalassa within 30 miles of: a.…replaced · 1999-11-17
- Underwater operations in progress sunrise to sunset until 201800Z nov by M/V thalassa within 20 miles of: a.…cancelled by · 1999-11-19
Nearby now · within 120 nm
Nothing else in force within 120 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.