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 1239/01 · Other2001-04-24 → 2001-04-26
    Fog signal at sandettie lightvessel 51-09N 001-47E at reduced power
  2. HYDROLANT 1233/01 · Cable ops2001-04-24 → 2001-04-26
    Underwater operations in progress until further notice by cableship maersk forwarder vicinity of trackline…
  3. HYDROLANT 1217/01 · Cable ops2001-04-22 → 2001-04-30
    Underwater operations in progress until further notice by cableship monarch vicinity 51-11N 002-01E
  4. HYDROLANT 1184/01 · Cable ops2001-04-18 → 2001-04-19
    Underwater operations in progress until further notice by cableship maersk forwarder vicinity of trackline…
  5. HYDROLANT 1170/01 · Other2001-04-16 → 2001-04-19
    Start point light 59-17N 002-23W at reduced intensity
  6. HYDROLANT 1169/01 · Nav aids2001-04-15 → 2001-04-25
    Fog signal at rattray head light 57-37N 001-49W unreliable
  7. HYDROLANT 1155/01 · Surveys2001-04-14 → 2001-05-14
    Underwater operations in progress until further notice by M/V discovery vicinity of trackline between 53-14N…
  8. HYDROLANT 1072/01 · Other2001-04-05 → 2001-04-06
    Start point light 59-17N 002-23W at reduced intensity
  9. HYDROLANT 1060/01 · Nav aids2001-04-04 → 2001-04-05
    Little holm light 60-34N 001-16W unlit
  10. HYDROLANT 1028/01 · Mines2001-03-31 → 2001-04-05
    Mine adrift, possibly marked by red flag, vicinity 52-36N 002-17E at 291720Z mar
  11. HYDROLANT 1014/01 · Mines2001-03-29 → 2001-03-31
    Mine adrift marked by light, f w, vicinity 52-36N 002-17E at 291720Z mar
  12. HYDROLANT 1002/01 · Mines2001-03-28 → 2001-03-29
    Mine adrift marked by light, f w, vicinity 52-38.20N 002-08.79E at 281745Z mar
  13. HYDROLANT 977/01 · Cable ops2001-03-26 → 2001-03-30
    Underwater operations in progress until further notice by cableship monarch vicinity 51-11N 002-01E
  14. HYDROLANT 975/01 · Cable ops2001-03-26 → 2001-03-26
    Underwater operations in progress until further notice by cableship maersk forwarder vicinity of trackline…
  15. HYDROLANT 972/01 · Other2001-03-26 → 2001-03-26
    Isle of may light 56-11N 002-33W at reduced intensity
  16. HYDROLANT 931/01 · Cable ops2001-03-22 → 2001-03-24
    Underwater operations in progress until further notice by cableship monarch vicinity 51-10.2N 002-01.5E
  17. HYDROLANT 927/01 · Nav aids2001-03-22 → 2001-04-04
    Fairy west cardinal buoy 51-23.8N 002-09.4E unlit
  18. HYDROLANT 920/01 · Nav aids2001-03-21 → 2001-03-21
    RACON at orfordness light 52-05N 001-35E unreliable 211000Z to 211500Z mar
  19. HYDROLANT 903/01 · Nav aids2001-03-19 → 2001-07-24
    Fog signal at ruytingen sw buoy 51-05N 001-47E inoperative
  20. HYDROLANT 877/01 · Other2001-03-16 → 2001-03-18
    Duncansby head light 58-39N 003-01W at reduced intensity

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