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 246/01 · Nav aids2001-01-21 → 2001-01-31
    Ruytingen northwest buoy 51-09N 001-57E unlit
  2. HYDROLANT 231/01 · Other2001-01-20 → 2001-02-03
    Exposed cable on seabed in 51-25.6N 001-31.9E
  3. HYDROLANT 208/01 · Cable ops2001-01-18 → 2001-01-20
    Underwater operations in progress until further notice by cableship monarch within one mile of 51-25.3N…
  4. HYDROLANT 181/01 · Nav aids2001-01-16 → 2001-02-16
    RACON at lother rock light 58-44N 002-59W inoperative
  5. HYDROLANT 103/01 · Nav aids2001-01-09 → 2001-04-20
    Range at auskerry light 59-02N 002-34W changed to 20 miles
  6. HYDROLANT 86/01 · Nav aids2001-01-09 → 2001-01-17
    Fairy south buoy 51-20N 002-17E unlit
  7. HYDROLANT 33/01 · Nav aids2001-01-04 → 2001-02-16
    Fog signal at ruytingen sw buoy 51-05N 001-47E inoperative
  8. HYDROLANT 4240/00 · Nav aids2000-12-27 → 2000-12-27
    Auskerry light 59-02N 002-34W unreliable
  9. HYDROLANT 4165/00 · Cable ops2000-12-19 → 2000-12-23
    Underwater cable operations in progress until further notice by cableship monarch within one mile of…
  10. HYDROLANT 4137/00 · Cable ops2000-12-16 → 2000-12-19
    Underwater cable operations in progress until further notice by cableship monarch within one mile of…
  11. HYDROLANT 4125/00 · Nav aids2000-12-15 → 2000-12-21
    Dgps station at flamborough head light 54-07N 000-05W unreliable
  12. HYDROLANT 4108/00 · Nav aids2000-12-14 → 2000-12-17
    Ruytingen northwest buoy 51-09N 001-57E missing
  13. HYDROLANT 4103/00 · Nav aids2000-12-13 → 2000-12-14
    Ruytingen northwest buoy 51-09N 001-57E off station
  14. HYDROLANT 4061/00 · Cable ops2000-12-07 → 2000-12-09
    Underwater operations in progress until further notice by cableship ocean challenger vicinity of trackline…
  15. HYDROLANT 4025/00 · Nav aids2000-12-03 → 2000-12-16
    Cable buoy established in 51-26.8N 002-37.0E
  16. HYDROLANT 4015/00 · Cable ops2000-12-02 → 2000-12-11
    Cable operations in progress until further notice by cableship peter faber vicinity 51-34.2N 001-56.3E
  17. HYDROLANT 3938/00 · Nav aids2000-11-25 → 2000-12-18
    Cable buoy established in 51-27.5N 002-37.7E
  18. HYDROLANT 3901/00 · Nav aids2000-11-21 → 2000-11-24
    Fog signal at inchkeith light 56-02.2N 003-08.2W discontinued
  19. HYDROLANT 3886/00 · Cable ops2000-11-19 → 2000-11-25
    Underwater operations in progress until further notice by cableship monarch within two miles of: a. 51-15.0N…
  20. HYDROLANT 3871/00 · Cable ops2000-11-17 → 2000-11-19
    Underwater operations in progress until further notice by cableship monarch: a. within one mile of 51-15.0N…

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