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 633/14 · Nav aids2014-03-02 → 2014-03-03
    Southern North Sea
  2. HYDROLANT 629/14 · Nav aids2014-03-02 → 2014-03-02
    England-southeast Coast
  3. HYDROLANT 622/14 · Nav aids2014-03-01 → 2014-03-01
    England-southeast Coast
  4. HYDROLANT 605/14 · Nav aids2014-02-27 → 2014-02-27
    Fair Isle
  5. HYDROLANT 586/14 · Nav aids2014-02-25 → 2014-02-27
    Cancel this 271500Z feb 14
  6. HYDROLANT 577/14 · Nav aids2014-02-24 → 2014-02-27
    England-southeast Coast
  7. HYDROLANT 524/14 · Nav aids2014-02-20 → 2014-02-21
    Scotland-southeast Coast
  8. HYDROLANT 488/14 · Cable ops2014-02-17 → 2014-02-20
    Underwater operations in progress until further notice by cableship wave sentinel vicinity 52-50.6N 002-49.8E
  9. HYDROLANT 485/14 · Nav aids2014-02-17 → 2014-02-25
    Southern North Sea
  10. HYDROLANT 482/14 · Nav aids2014-02-17 → 2014-02-17
    Fair Isle
  11. HYDROLANT 467/14 · Nav aids2014-02-15 → 2014-02-17
    Cancel HYDROLANT 429/14(35,36), station restored
  12. HYDROLANT 464/14 · Nav aids2014-02-15 → 2014-02-15
    Scotland
  13. HYDROLANT 457/14 · Cable ops2014-02-14 → 2014-04-08
    Seismic survey in progress until further notice by M/V atlantic explorer towing six 6500 meter long cables…
  14. HYDROLANT 456/14 · Cable ops2014-02-14 → 2014-06-18
    Seismic survey in progress until further notice by M/V harrier explorer and M/V seabed prince with…
  15. HYDROLANT 443/14 · Nav aids2014-02-13 → 2014-03-20
    Southern North Sea
  16. HYDROLANT 402/14 · Nav aids2014-02-08 → 2014-02-08
    England-southeast Coast
  17. HYDROLANT 397/14 · Debris2014-02-08 → 2014-02-11
    Large buoy adrift in 58-00N 001-18E at 081000Z feb
  18. HYDROLANT 384/14 · Debris2014-02-07 → 2014-02-08
    Large buoy adrift in 57-54.9N 001-14.5E at 071030Z feb
  19. HYDROLANT 375/14 · Nav aids2014-02-06 → 2014-02-07
    England-southeast Coast
  20. HYDROLANT 365/14 · Debris2014-02-06 → 2014-02-09
    Large buoy adrift in 57-48N 000-51E at 060600Z feb

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