North Sea

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

in force
1
last 12 months
6
since 1997
4,730
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%
Other66814%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,729 cancelled

  1. HYDROLANT 3194/13 · Nav aids2013-12-10 → 2013-12-11
    Mrcc humber 54-05.6N 000-10.5W r/t dsc services unreliable
  2. HYDROLANT 3189/13 · Other2013-12-10 → 2014-01-21
    Ordnance
  3. HYDROLANT 3157/13 · Nav aids2013-12-07 → 2013-12-07
    England-east Coast
  4. HYDROLANT 3151/13 · Nav aids2013-12-06 → 2013-12-08
    Cancel this msg 081500Z dec 13
  5. HYDROLANT 3115/13 · Nav aids2013-12-04 → 2013-12-17
    Southern North Sea
  6. HYDROLANT 3107/13 · Surveys2013-12-03 → 2013-12-09
    Survey operations in progress until further notice by M/V geoholm with submersible along trackline joining…
  7. HYDROLANT 3106/13 · Nav aids2013-12-03 → 2013-12-05
    Cancel this msg 051900Z dec 13
  8. HYDROLANT 3083/13 · Nav aids2013-12-01 → 2013-12-03
    Cancel this msg 031900Z dec 13
  9. HYDROLANT 3080/13 · Nav aids2013-12-01 → 2013-12-02
    England-east Coast
  10. HYDROLANT 3076/13 · Nav aids2013-11-30 → 2013-12-02
    Southern North Sea
  11. HYDROLANT 3065/13 · Nav aids2013-11-30 → 2013-12-04
    England-east Coast
  12. HYDROLANT 3048/13 · Other2013-11-29 → 2013-11-30
    Cancel HYDROLANT 2587/13
  13. HYDROLANT 3028/13 · Nav aids2013-11-28 → 2013-12-20
    B. 53-09.5N 000-38.9E light unreliable
  14. HYDROLANT 3021/13 · Nav aids2013-11-27 → 2013-11-28
    England-southeast Coast
  15. HYDROLANT 3013/13 · Nav aids2013-11-27 → 2013-11-28
    Southern North Sea
  16. HYDROLANT 2983/13 · Nav aids2013-11-24 → 2014-01-05
    Platform 49/17-GD, 53-26.8N 002-15.3E unlit
  17. HYDROLANT 2982/13 · Cable ops2013-11-24 → 2014-02-14
    Seismic survey in progress until further notice by M/V atlantic explorer towing six 6500 meter long cables…
  18. HYDROLANT 2950/13 · Nav aids2013-11-20 → 2013-11-24
    Platform 49/17-GD, 53-26.8N 002-15.3E unlit
  19. HYDROLANT 2909/13 · Nav aids2013-11-18 → 2013-11-20
    B. 49/17-HD, 53-29.8N 002-19.4E
  20. HYDROLANT 2898/13 · Nav aids2013-11-16 → 2013-12-28
    Cancel HYDROLANT 2855/13(36), operations completed

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