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 3426/18 · Surveys2018-11-04 → 2018-11-19
    Survey operations in progress until further notice by M/V harrier explorer towing 8000 meter long cable in…
  2. HYDROLANT 3418/18 · Surveys2018-11-02 → 2018-11-07
    Underwater operations in progress until further notice by M/V sovereign in vicinity of 52-21.1N 002-49.2E
  3. HYDROLANT 3394/18 · Other2018-10-31 → 2018-11-06
    Unexploded ordnance in area bound by 52-05N 001-37E, 52-05N 001-45E, 51-58N 001-30E, 52-00N 001-30E
  4. HYDROLANT 3381/18 · Surveys2018-10-31 → 2018-11-01
    Underwater operations in progress until further notice by M/V stornes in vicinity of trackline joining…
  5. HYDROLANT 3379/18 · Nav aids2018-10-30 → 2018-11-09
    All navigational aids at platform 49/23E, 53-11.9N 002-29.1E unreliable
  6. HYDROLANT 3361/18 · Nav aids2018-10-29 → 2018-11-07
    All navigational aids at platform pickerill b, 53-31.5N 001-09.6E inoperative
  7. HYDROLANT 3342/18 · Cable ops2018-10-26 → 2018-11-26
    Cable operations in progress until further notice by cableship living stone cableship connector and M/V…
  8. HYDROLANT 3296/18 · Nav aids2018-10-20 → 2018-10-20
    Cromer light 52-55.5N 001-19.0E unreliable
  9. HYDROLANT 3274/18 · Nav aids2018-10-18 → 2018-11-29
    Fog signal at anglia gas platform, 53-22.1N 001-39.2E inoperative
  10. HYDROLANT 3213/18 · Surveys2018-10-12 → 2018-10-13
    Underwater operations in progress until further notice by M/V global symphony in vicinity 51-19.6N 001-54.6E
  11. HYDROLANT 3212/18 · Nav aids2018-10-12 → 2018-11-06
    All navigational aids at platform 49/21 rd, 53-14.9N 002-01.5E inoperative
  12. HYDROLANT 3189/18 · Nav aids2018-10-10 → 2018-10-11
    All navigational aids at beatrice oil field wind turbine a, 58-06.3N 003-04.5W inoperative
  13. HYDROLANT 3165/18 · Nav aids2018-10-08 → 2018-10-09
    RACON at bell rock light 56-26.1N 002-23.2W inoperative
  14. HYDROLANT 3156/18 · Nav aids2018-10-08 → 2018-10-10
    NAVTEX station cullercoats (g) 55-01N 001-25W unreliable
  15. HYDROLANT 3134/18 · Nav aids2018-10-05 → 2018-11-16
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  16. HYDROLANT 3108/18 · Surveys2018-10-02 → 2018-10-26
    Survey operations in progress until further notice by M/V ramform atlas towing 12 five mile long cables in…
  17. HYDROLANT 3101/18 · Wrecks2018-10-02 → 2018-11-13
    Obstruction, marked by orange buoy, in 56-16.45N 002-15.17W
  18. HYDROLANT 3092/18 · Wrecks2018-10-01 → 2018-10-02
    Obstruction, marked by orange buoy, in 56-16.75N 002-15.28W
  19. HYDROLANT 3067/18 · Cable ops2018-09-28 → 2018-10-26
    Cable operations in progress until further notice by cableship connector and M/V lange wrapper in area bound…
  20. HYDROLANT 3001/18 · Surveys2018-09-22 → 2018-10-20
    Underwater operations in progress until further notice by M/V sovereign in vicinity of 51-54.7N 002-22.5E

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