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 1017/02 · Nav aids2002-05-03 → 2002-05-03
    East goodwin lightfloat 51-13N 001-36E and RACON unreliable 030930Z to 031600Z may
  2. HYDROLANT 1009/02 · Surveys2002-05-01 → 2002-06-28
    Underwater operations in progress until further notice by M/V cso constructor in area between 57-10.2N…
  3. HYDROLANT 1006/02 · Containers2002-05-01 → 2002-05-01
    Two 40 foot containers adrift in 51-14.0N 002-11.2E at 010630Z may
  4. HYDROLANT 986/02 · Nav aids2002-04-29 → 2002-04-29
    RACON at cromer light 52-56N 001-19E inoperative until 291400Z apr
  5. HYDROLANT 952/02 · Cable ops2002-04-24 → 2002-04-25
    Seismic survey in progress until further notice by M/V geo surveyor within one mile of 53-07.5N 002-47.0E
  6. HYDROLANT 895/02 · Nav aids2002-04-17 → 2002-04-17
    Fairy west buoy 51-23.9N 002-09.4E unlit
  7. HYDROLANT 828/02 · Nav aids2002-04-11 → 2002-04-12
    Bell rock light 56-26.1N 002-23.1W unreliable
  8. HYDROLANT 778/02 · Cable ops2002-04-05 → 2002-04-06
    Underwater operations in progress until further notice by cableship maersk defender vicinity 51-05N 001-57E
  9. HYDROLANT 776/02 · Nav aids2002-04-05 → 2002-04-05
    NSR-R4 light 53-30N 002-31E unlit
  10. HYDROLANT 768/02 · Nav aids2002-04-04 → 2002-04-12
    Sandettie west buoy 51-15N 001-54E off station
  11. HYDROLANT 700/02 · Nav aids2002-03-26 → 2002-04-04
    Sandettie west buoy 51-15N 001-55E missing
  12. HYDROLANT 674/02 · Cable ops2002-03-24 → 2002-04-24
    Seismic survey in progress until further notice by M/V ramform viking towing eight 5500 meter long cables in…
  13. HYDROLANT 673/02 · Nav aids2002-03-24 → 2002-03-24
    RACON at galloper buoy 51-44N 001-56E inoperative
  14. HYDROLANT 671/02 · Cable ops2002-03-23 → 2002-04-12
    Underwater operations in progress until further notice by cableship monarch vicinity 52-14N 002-13E
  15. HYDROLANT 661/02 · Nav aids2002-03-22 → 2002-03-22
    North shipwash buoy 52-02N 001-38E unlit
  16. HYDROLANT 657/02 · Cable ops2002-03-21 → 2002-03-29
    Underwater operations in progress until further notice by cableship peter faber in vicinity 52-48N 002-52E
  17. HYDROLANT 650/02 · Cable ops2002-03-21 → 2002-03-23
    Underwater operations in progress until further notice by cableship monarch vicinity 52-21N 002-49E
  18. HYDROLANT 608/02 · Cable ops2002-03-15 → 2002-03-19
    Underwater operations in progress until further notice by cableship peter faber vicinity 51-04N 001-47E
  19. HYDROLANT 597/02 · Other2002-03-14 → 2002-03-15
    Newarp lightship 52-48.3N 001-55.7E at reduced intensity
  20. HYDROLANT 593/02 · Nav aids2002-03-14 → 2002-03-14
    RACON at buchan ness light 57-28N 001-46W unreliable until 141700Z mar

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