Surveys
Underwater operations in progress sunrise to sunset until 181800Z nov by M/V thalassa within 30 miles of: a.…
HYDROLANT 2463/99
- issued
- 1999-11-17 10:40Z
- status
- cancelled 1999-11-18 09:55Z (archive)
- self-cancels
- 1999-11-18 19:00Z
- authority
- WZ 2050/99 170948Z NOV 99
- sea
- Celtic Sea
- position
- 51.000, -10.500
- source
- nga_json · first seen 2026-08-17 13:38Z
Original warning text
1. UNDERWATER OPERATIONS IN PROGRESS SUNRISE TO SUNSET UNTIL 181800Z NOV BY M/V THALASSA WITHIN 30 MILES OF: A. 51-00N 011-00W ON 17 NOV. B. 51-00N 010-00W ON 18 NOV. 2. CANCEL THIS MSG 181900Z NOV.
This area · survey operations
272 within 180 nm since 1999 · 0 in the last 12 months · 0 in force now
99
00
05
10
15
20
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
- Survey operations in progress until further notice by M/V ridley thomas along trackline joining 48-29.2N…2020-08-30
- Survey operations in progress until further notice by M/V ridley thomas in vicinity of trackline joining…2020-08-08
- Survey operations in progress until further notice by M/V ridley thomas in vicinity of trackline joining…2020-08-03
- Survey operations in progress until further notice by M/V ridley thomas in vicinity of trackline joining…2020-07-29
Season · when survey operations happen here
J
F
M
A
M
J
J
A
S
O
N
D
month of issue, all years in the archive
Timeline
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.