North Sea

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

in force
1
last 12 months
6
since 1997
4,731
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 aids2,50253%
Other66914%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,730 cancelled

  1. HYDROLANT 1049/12 · Nav aids2012-05-16 → 2012-06-13
    Cancel HYDROLANT 746/12
  2. HYDROLANT 1048/12 · Nav aids2012-05-16 → 2012-06-17
    Southern North Sea
  3. HYDROLANT 1024/12 · Nav aids2012-05-14 → 2012-05-15
    Shetland Islands
  4. HYDROLANT 1023/12 · Nav aids2012-05-14 → 2012-05-14
    Fair Isle
  5. HYDROLANT 1022/12 · Cable ops2012-05-13 → 2012-07-09
    Seismic survey in progress until 24 jul by M/V geco triton towing ten 2600 meter long cables in area bound…
  6. HYDROLANT 992/12 · Derelicts2012-05-10 → 2012-05-11
    Derelict helicopter in 56-58.4N 001-38.3W at 101810Z may
  7. HYDROLANT 969/12 · Other2012-05-07 → 2012-06-18
    Cancel HYDROLANT 686/12
  8. HYDROLANT 964/12 · Nav aids2012-05-07 → 2012-05-07
    Shetland Islands
  9. HYDROLANT 920/12 · Nav aids2012-04-30 → 2012-06-13
    Southern North Sea
  10. HYDROLANT 911/12 · Cable ops2012-04-29 → 2012-05-05
    Cable operations in progress until further notice by cableship ile de brehat along trackline between…
  11. HYDROLANT 897/12 · Other2012-04-27 → 2012-08-25
    England-east Coast
  12. HYDROLANT 892/12 · Nav aids2012-04-26 → 2012-05-03
    Cancel HYDROLANT 539/12
  13. HYDROLANT 891/12 · Other2012-04-26 → 2012-06-06
    Nga chart 35004 1. navigation prohibited unless authorized by mrcc aberdeen within three miles of 57-00.0N…
  14. HYDROLANT 882/12 · Nav aids2012-04-23 → 2012-04-24
    Scotland-southeast Coast
  15. HYDROLANT 876/12 · Nav aids2012-04-22 → 2012-04-23
    Dover Strait
  16. HYDROLANT 862/12 · Nav aids2012-04-20 → 2012-04-20
    Mrcc humber mf dsc service at flamborough head site 54-07N 000-05W unreliable
  17. HYDROLANT 852/12 · Surveys2012-04-18 → 2012-04-23
    Underwater operations in progress until further notice by M/V highland eagle in 56-33.58N 002-30.95E
  18. HYDROLANT 830/12 · Nav aids2012-04-14 → 2012-04-14
    Shetland Islands
  19. HYDROLANT 809/12 · Nav aids2012-04-12 → 2012-06-09
    Southern North Sea
  20. HYDROLANT 789/12 · Nav aids2012-04-10 → 2012-05-16
    Southern North Sea

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