North Sea

IHO sea area 4 · -4° to 12° E, 51° to 61° N

in force
1
last 12 months
7
since 1997
4,732
categories
11

In force now · 1

  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.

Longest in force

  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.

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 aids2,50353%
Other66914%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,731 cancelled

  1. HYDROLANT 250/00 · Nav aids2000-01-23 → 2000-01-24
    Elbow buoy 51-23N 001-32E unlit
  2. HYDROLANT 248/00 · Nav aids2000-01-23 → 2000-01-23
    Saint abbs head light 55-55N 002-08W unlit
  3. HYDROLANT 247/00 · Surveys2000-01-23 → 2000-01-25
    Underwater operations in progress until further notice by M/V brodospas star in area between 52-29N 002-26E…
  4. HYDROLANT 210/00 · Surveys2000-01-20 → 2000-01-22
    Underwater operations in progress until further notice by M/V brodospas star vicinity of trackline between…
  5. HYDROLANT 204/00 · Surveys2000-01-19 → 2000-01-20
    Underwater operations in progress until further notice by M/V brodospas star vicinity of trackline between…
  6. HYDROLANT 198/00 · Nav aids2000-01-18 → 2000-01-25
    Bergues bank buoy 51-17N 002-19E unlit
  7. HYDROLANT 169/00 · Surveys2000-01-17 → 2000-01-18
    Underwater operations in progress until further notice by M/V brodospas star vicinity of trackline between…
  8. HYDROLANT 166/00 · Nav aids2000-01-16 → 2000-01-17
    Firths voe light 60-27N 001-11W unreliable
  9. HYDROLANT 124/00 · Cable ops2000-01-14 → 2000-01-15
    Cable operations in progress until further notice by cableship maersk forwarder vicinity 51-59N 002-13E
  10. HYDROLANT 85/00 · Cable ops2000-01-09 → 2000-01-14
    Cable operations in progress until further notice by cableship maersk forwarder vicinity 51-58N 002-13E
  11. HYDROLANT 67/00 · Nav aids2000-01-08 → 2000-01-10
    All navigational aids at amethyst B1D platform 53-34N 000-53E unreliable during daylight hours until 09 jan
  12. HYDROLANT 41/00 · Nav aids2000-01-04 → 2000-01-06
    Start point light 59-17N 002-23W unlit
  13. HYDROLANT 40/00 · Nav aids2000-01-04 → 2000-01-05
    St abbs head light 55-55N 002-08W unreliable
  14. HYDROLANT 33/00 · Cable ops2000-01-04 → 2000-01-08
    Cable operations in progress until further notice by cableship maersk forwarder vicinity of trackline…
  15. HYDROLANT 2867/99 · Nav aids1999-12-31 → 2000-01-25
    Fairy south buoy 51-21N 002-17E unlit
  16. HYDROLANT 2830/99 · Cable ops1999-12-27 → 2000-01-01
    Cable operations in progress until further notice by cableship monarch vicinity 51-35N 001-56E
  17. HYDROLANT 2818/99 · Nav aids1999-12-26 → 1999-12-27
    Rce buoy 51-02N 001-53E unlit
  18. HYDROLANT 2799/99 · Derelicts1999-12-25 → 1999-12-31
    Derelict M/V confidence adrift vicinity 55-41.5N 000-06.0W at 250500Z dec
  19. HYDROLANT 2782/99 · Nav aids1999-12-21 → 1999-12-23
    Out skerries light 60-26N 000-44W unreliable
  20. HYDROLANT 2779/99 · Nav aids1999-12-21 → 1999-12-27
    Cable buoys temporarily established in: a. 51-36.4N 001-57.0E

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