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 339/14 · Nav aids2014-02-03 → 2014-03-04
    All navigational aids at platform 49/17-CD, 53-25.3N 002-22.2E inoperative
  2. HYDROLANT 321/14 · Nav aids2014-02-02 → 2014-04-27
    Cancel HYDROLANT 311/14(36), vessel beached
  3. HYDROLANT 320/14 · Nav aids2014-02-02 → 2014-02-07
    Scotland
  4. HYDROLANT 305/14 · Nav aids2014-02-01 → 2014-02-01
    Cancel HYDROLANT 283/14, aid restored
  5. HYDROLANT 299/14 · Nav aids2014-01-31 → 2014-03-07
    England-east Coast
  6. HYDROLANT 285/14 · Nav aids2014-01-31 → 2014-02-25
    Southern North Sea
  7. HYDROLANT 276/14 · Nav aids2014-01-30 → 2014-01-31
    Audrey Gas Field
  8. HYDROLANT 256/14 · Nav aids2014-01-27 → 2014-02-06
    North Sea
  9. HYDROLANT 244/14 · Cable ops2014-01-26 → 2014-02-04
    Underwater operations in progress until further notice by cableship wave sentinel in area bound by 52-22.0N…
  10. HYDROLANT 237/14 · Nav aids2014-01-25 → 2014-01-26
    Shetland Islands
  11. HYDROLANT 230/14 · Nav aids2014-01-24 → 2014-02-03
    Southern North Sea
  12. HYDROLANT 205/14 · Other2014-01-21 → 2014-04-15
    Cancel HYDROLANT 3189/13
  13. HYDROLANT 194/14 · Nav aids2014-01-19 → 2014-01-23
    Southern North Sea
  14. HYDROLANT 180/14 · Nav aids2014-01-17 → 2014-01-19
    Southern North Sea
  15. HYDROLANT 152/14 · Nav aids2014-01-15 → 2014-01-15
    England-southeast Coast
  16. HYDROLANT 106/14 · Nav aids2014-01-11 → 2014-02-03
    All navigational aids at platform 49/17-DD, 53-26.4N 002-23.6E inoperative
  17. HYDROLANT 105/14 · Nav aids2014-01-11 → 2014-01-11
    England-southeast Coast
  18. HYDROLANT 103/14 · Cable ops2014-01-11 → 2014-05-22
    Seismic survey in progress until further notice by M/V oceanic challenger towing eight 8500 meter long…
  19. HYDROLANT 101/14 · Nav aids2014-01-10 → 2014-01-13
    England-southeast Coast
  20. HYDROLANT 100/14 · Cable ops2014-01-10 → 2014-01-12
    Underwater operations in progress until further notice by cableship ile de aix vicinity 58-50.3N 002-51.7W

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