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 3218/22 · Nav aids2022-12-15 → 2023-01-26
    Fog signal at east goodwin lightfloat 51-13.00N 001-36.30E inoperative
  2. HYDROLANT 3191/22 · Other2022-12-13 → 2023-01-24
    Unexploded ordnance in: a. 54-52.04N 001-42.22E
  3. HYDROLANT 3189/22 · Nav aids2022-12-13 → 2022-12-14
    Firths voe light 60-27.20N 001-10.70W unreliable
  4. HYDROLANT 3188/22 · Nav aids2022-12-13 → 2022-12-20
    All navigational aids at platform 49/26-CP 53-05.80N 002-09.60E unlit
  5. HYDROLANT 3169/22 · Nav aids2022-12-09 → 2023-01-20
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.64N 002-03.23W off air
  6. HYDROLANT 3131/22 · Other2022-12-05 → 2022-12-09
    500 meter safety zone established in 58-47.36N 001-21.01E
  7. HYDROLANT 3082/22 · Nav aids2022-11-30 → 2022-12-04
    Fog signals at platform 49/18-B 53-23.60N 002-31.50E inoperative
  8. HYDROLANT 3072/22 · Nav aids2022-11-29 → 2022-12-05
    RACON at cromer light 52-55.50N 001-19.00E unreliable 290900Z nov to 042359Z dec
  9. HYDROLANT 3014/22 · Nav aids2022-11-23 → 2022-11-23
    Dsc services at noss head site 58-28.70N 003-03.10W off air
  10. HYDROLANT 2974/22 · Nav aids2022-11-19 → 2022-12-20
    All navigational aids at platform 48/13-PB 53-36.80N 001-31.60E inoperative
  11. HYDROLANT 2951/22 · Nav aids2022-11-17 → 2022-11-23
    All navigational aids at platform 49/30-A, 53-00.3N 002-53.7E inoperative
  12. HYDROLANT 2942/22 · Debris2022-11-16 → 2022-11-19
    South cardinal buoy adrift in vicinity 51-36.10N 002-00.20E at 161436Z nov
  13. HYDROLANT 2929/22 · Nav aids2022-11-15 → 2022-11-18
    NAVTEX station cullercoats (g) 55-04.48N 001-27.79W off air 0900Z to 1700Z daily 16 thru 18 nov
  14. HYDROLANT 2847/22 · Nav aids2022-11-07 → 2022-11-11
    East goodwin lightfloat 51-13.30N 001-36.40E unlit
  15. HYDROLANT 2822/22 · Cable ops2022-11-04 → 2022-12-04
    Seismic survey in progress by M/V kommandor towing 1200 meter long cable in area bound by 57-05.10N…
  16. HYDROLANT 2786/22 · Nav aids2022-11-02 → 2022-11-04
    RACON at northeast goodwin bouy 51-20.30N 001-34.20E inoperative
  17. HYDROLANT 2782/22 · Nav aids2022-11-02 → 2022-11-04
    RACON at ne goodwin buoy 51-20.31N 001-34.16E inoperative
  18. HYDROLANT 2770/22 · Other2022-11-01 → 2022-12-13
    Unexploded ordnance in: a. 54-52.04N 001-42.22E
  19. HYDROLANT 2769/22 · Nav aids2022-11-01 → 2022-11-04
    RACON at east goodwin lightfloat 51-13.00N 001-36.30E inoperative
  20. HYDROLANT 2744/22 · Nav aids2022-10-28 → 2022-12-09
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.64N 002-03.23W 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.