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

  1. HYDROLANT 1496/26 · Surveys2026-08-03
    Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey 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

  1. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. HYDROLANT 1496/26 · Surveys2026-08-03
    Survey 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 aids2,50053%
Other66814%
Cable ops65814%
Surveys58212%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,724 cancelled

  1. HYDROLANT 322/23 · Nav aids2023-02-09 → 2023-02-17
    All navigational aids at platform 49/30-A, 53-00.3N 002-53.8E inoperative
  2. HYDROLANT 288/23 · Exercises2023-02-05 → 2023-02-17
    Hazardous operations 060600Z to 102000Z and 130600Z to 172000Z feb in area bound by 61-13.0N 000-30.0E,…
  3. HYDROLANT 269/23 · Nav aids2023-02-03 → 2023-03-17
    Cgoc shetland mf r/t and dsc services at st margaret's hope site in 58-49.30N 002-57.40W off air
  4. HYDROLANT 268/23 · Nav aids2023-02-03 → 2023-02-04
    Out skerries light 60-25.50N 000-43.70W unreliable
  5. HYDROLANT 252/23 · Other2023-01-31 → 2023-02-02
    All navigational aids inoperative at platform 42/30-ST3 54-04.30N 000-54.80E and platform 43/26-ST2 54-03.0N…
  6. HYDROLANT 239/23 · Nav aids2023-01-29 → 2023-01-31
    All navigational aids at platform 42/30-ST3 54-04.30N 000-54.80E inoperative
  7. HYDROLANT 236/23 · Nav aids2023-01-29 → 2023-02-03
    All navigational aids at platform 48/29-B 53-03.20N 001-41.10E inoperative
  8. HYDROLANT 216/23 · Nav aids2023-01-26 → 2023-01-28
    Fog signal at east goodwin lightfloat 51-13.00N 001-36.30E inoperative
  9. HYDROLANT 162/23 · Nav aids2023-01-20 → 2023-03-03
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.65N 002-03.22W off air
  10. HYDROLANT 109/23 · Nav aids2023-01-12 → 2023-01-13
    Hoy sound rear light 58-56.10N 003-16.30W unreliable
  11. HYDROLANT 76/23 · Nav aids2023-01-09 → 2023-01-10
    Cullercoats NAVTEX station (g) 55-04.48N 001-27.79W off air 100900Z to 101700Z jan
  12. HYDROLANT 75/23 · Other2023-01-09 → 2023-05-05
    Offshore wind farm construction area established in area bound by 55-04.40N 001-29.00E, 55-06.30N…
  13. HYDROLANT 41/23 · Nav aids2023-01-05 → 2023-01-05
    Tarbat ness light 57-51.90N 003-46.60W unlit
  14. HYDROLANT 18/23 · Nav aids2023-01-02 → 2023-01-04
    Tarbat ness light 57-51.9N 003-46.6W unreliable
  15. HYDROLANT 17/23 · Nav aids2023-01-02 → 2023-01-06
    Out skerries light 60-25.50N 000-43.70W unreliable
  16. HYDROLANT 16/23 · Other2023-01-02 → 2023-01-09
    Offshore wind farm construction area established in area bound by 55-04.40N 001-29.00E, 55-06.30N…
  17. HYDROLANT 3281/22 · Nav aids2022-12-23 → 2023-02-03
    Cgoc shetland mf r/t and dsc services at st margaret's hope site in 58-49.30N 002-57.40W off air
  18. HYDROLANT 3246/22 · Nav aids2022-12-19 → 2023-01-24
    RACON (o) at dudgeon buoy 53-16.60N 001-16.90E inoperative
  19. HYDROLANT 3239/22 · Nav aids2022-12-19 → 2022-12-19
    Seagreen off shore wind farm, east cardinal buoy in 56-31.90N 001-29.30W missing
  20. HYDROLANT 3237/22 · Nav aids2022-12-19 → 2022-12-23
    All navigational aids at platform 42/30-ST3 54-04.30N 000-54.80E inoperative

Sea boundaries: Flanders Marine Institute (2018), IHO Sea Areas v3, marineregions.org (CC BY 4.0). Not for navigation — follow official NAVAREA / coastal broadcasts.