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 1492/00 · Cable ops2000-04-27 → 2000-04-27
    Underwater operations in progress until further notice by cableship monarch within one mile of 51-28N 002-40E
  2. HYDROLANT 1489/00 · Surveys2000-04-27 → 2000-04-27
    Underwater operations in progress until further notice by M/V ace nature vicinity 52-12.7N 001-52.5E
  3. HYDROLANT 1486/00 · Nav aids2000-04-27 → 2000-04-27
    North foreland light 51-23N 001-27E unreliable until 271500Z apr
  4. HYDROLANT 1479/00 · Surveys2000-04-26 → 2000-04-28
    Underwater operations in progress until further notice by M/V toisa gryphon vicinity of trackline joining…
  5. HYDROLANT 1476/00 · Surveys2000-04-26 → 2000-04-28
    Survey operations in progress until further notice by M/V proud seahorse along trackline between 51-42N…
  6. HYDROLANT 1474/00 · Cable ops2000-04-26 → 2000-04-27
    Cable operations in progress until further notice by cableship monarch within one mile of 51-04N 001-53.3E
  7. HYDROLANT 1458/00 · Nav aids2000-04-25 → 2000-11-10
    Suspended wellhead, marked by pillar buoy, fl y 10 sec, established in 53-35.9N 002-45.3E
  8. HYDROLANT 1415/00 · Surveys2000-04-21 → 2000-04-24
    Underwater operations in progress until further notice by M/V toisa gryphon vicinity of trackline joining…
  9. HYDROLANT 1411/00 · Cable ops2000-04-21 → 2000-04-25
    Cable operations in progress until further notice by cableship monarch within one mile of 51-22.1N 002-30.3E
  10. HYDROLANT 1409/00 · Surveys2000-04-21 → 2000-04-22
    Underwater operations in progress until further notice by M/V goosander with submersible vicinity 51-20N…
  11. HYDROLANT 1402/00 · Surveys2000-04-20 → 2000-04-26
    Underwater operations in progress until further notce by M/V ace nature with submersible vicinity 51-59N…
  12. HYDROLANT 1346/00 · Cable ops2000-04-16 → 2000-04-16
    Underwater operations in progress until further notice by cableship monarch vicinity 51-22N 002-30E
  13. HYDROLANT 1335/00 · Nav aids2000-04-15 → 2000-04-16
    Covesea skerries light 57-44N 003-20W unreliable
  14. HYDROLANT 1334/00 · Surveys2000-04-15 → 2000-04-20
    Underwater operations in progress until further notice by M/V goosander with submersible vicinity 51-22N…
  15. HYDROLANT 1295/00 · Containers2000-04-12 → 2000-04-19
    Container adrift vicinity 53-42.1N 001-56.1E at 121240Z apr
  16. HYDROLANT 1253/00 · Nav aids2000-04-08 → 2000-04-12
    Fog signal at platform C1D 53-39N 000-36E inoperative
  17. HYDROLANT 1252/00 · Nav aids2000-04-08 → 2000-05-05
    Platform A1D 53-37N 000-43E unlit
  18. HYDROLANT 1247/00 · Surveys2000-04-08 → 2000-04-08
    Underwater operations in progress until further notice by M/V mansal 18 with submersible along trackline…
  19. HYDROLANT 1245/00 · Nav aids2000-04-08 → 2000-04-10
    Dgps station at flamborough head light 54-07N 000-05W at reduced power
  20. HYDROLANT 1231/00 · Nav aids2000-04-07 → 2000-07-28
    Elbe 1 lightfloat 53-59.9N 008-06.5E removed

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