North Sea
IHO sea area 4 · -4° to 12° E, 51° to 61° N
- in force
- 3
- last 12 months
- 3
- since 1997
- 4,727
- categories
- 11
In force now · 3
- HYDROLANT 1496/26 · Surveys2026-08-03Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.
- HYDROLANT 1488/26 · Nav aids2026-08-01Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
- HYDROLANT 1477/26 · Surveys2026-07-31Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.
Longest in force
- HYDROLANT 1477/26 · Surveys2026-07-31Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.
- HYDROLANT 1488/26 · Nav aids2026-08-01Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
- HYDROLANT 1496/26 · Surveys2026-08-03Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.
By year
97
98
99
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
26
By month (all years)
J
F
M
A
M
J
J
A
S
O
N
D
By category · since 1997
| Nav aids | 2,500 | 53% |
| Other | 668 | 14% |
| Cable ops | 658 | 14% |
| Surveys | 582 | 12% |
| Wrecks | 170 | 4% |
| Containers | 44 | 1% |
| Derelicts | 34 | 1% |
| Exercises | 32 | 1% |
| Debris | 29 | 1% |
| Mines | 9 | 0% |
| Missiles | 1 | 0% |
Archive · 4,724 cancelled
- HYDROLANT 961/24 · Nav aids2024-05-06 → 2024-05-09NAVTEX station cullercoats (g) 55-04.00N 001-28.00W unreliable 0800Z to 1500Z daily 07 thru 09 may
- HYDROLANT 931/24 · Nav aids2024-05-01 → 2026-08-14All navigational aids at Platform 15/17-A in the North Sea at 58-25.00N 000-20.10E are inoperative.
- HYDROLANT 858/24 · Surveys2024-04-22 → 2024-05-26Survey operations in progress until 25 may by M/V ramform tethys towing 12 8000 meter long cables in area…
- HYDROLANT 833/24 · Nav aids2024-04-19 → 2024-05-08All navigational aids at platform katy 54-24.20N 002-39.50E inoperative
- HYDROLANT 793/24 · Nav aids2024-04-14 → 2024-04-21All navigational aids at platform 49/27-H 53-00.30N 002-12.90E inoperative
- HYDROLANT 769/24 · Nav aids2024-04-12 → 2024-04-12All navigational aids at platform 49/27-ED 53-03.60N 002-12.60E inoperative
- HYDROLANT 673/24 · Nav aids2024-04-01 → 2026-08-14The Humber Met Mast in the North Sea off England is unlit and its navigational aids are inoperative; HYDROLANT 351/24 is cancelled.
- HYDROLANT 637/24 · Nav aids2024-03-28 → 2024-03-29All navigational aids at platform 49/27-J 53-02.00N 002-13.10E inoperative
- HYDROLANT 636/24 · Nav aids2024-03-28 → 2024-03-30Dudgeon RACON 53-16.60N 001-16.90E inoperative
- HYDROLANT 440/24 · Derelicts2024-03-03 → 2024-03-06Derelict vessel adrift in 54-26.60N 002-01.40E at 031230Z mar
- HYDROLANT 378/24 · Nav aids2024-02-23 → 2024-03-21Sandettie n buoy 51-18.40N 002-04.70E missing
- HYDROLANT 351/24 · Nav aids2024-02-19 → 2024-04-01Humber met mast 53-10.70N 002-59.10E unlit and navaids inoperative
- HYDROLANT 329/24 · Nav aids2024-02-17 → 2024-02-19Copinsay light 58-53.80N 002-40.20W unreliable
- HYDROLANT 324/24 · Nav aids2024-02-16 → 2024-02-16Platform 48/13-PB 53-36.80N 001-31.60E unlit
- HYDROLANT 315/24 · Nav aids2024-02-15 → 2024-03-28Dudgeon RACON 53-16.60N 001-16.90E inoperative
- HYDROLANT 313/24 · Nav aids2024-02-14 → 2024-02-17Bass rock light 56-04.6N 002-38.5W unlit
- HYDROLANT 202/24 · Nav aids2024-01-27 → 2024-01-29Cgoc shetland mf dsc services at st margarets hope 58-46.9N 002-56.7W off air
- HYDROLANT 178/24 · Nav aids2024-01-23 → 2024-01-26Shoreston buoy 55-35.90N 001-39.30W off station
- HYDROLANT 141/24 · Nav aids2024-01-18 → 2024-04-12NAVTEX station cullercoats (g) 55-04.00N 001-28.00W unreliable
- HYDROLANT 140/24 · Nav aids2024-01-18 → 2024-01-18NAVTEX station cullercoats (g) 55-04.00N 001-28.00W off air
Sea boundaries: Flanders Marine Institute (2018), IHO Sea Areas v3, marineregions.org (CC BY 4.0). Not for navigation — follow official NAVAREA / coastal broadcasts.