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 2623/12 · Surveys2012-11-06 → 2012-11-07
    Underwater operations in progress until further notice by M/V geoholm with submersible vicinity of trackline…
  2. HYDROLANT 2609/12 · Nav aids2012-11-05 → 2012-11-05
    England-southeast Coast
  3. HYDROLANT 2607/12 · Nav aids2012-11-04 → 2012-12-15
    Cancel HYDROLANT 2209/12
  4. HYDROLANT 2606/12 · Nav aids2012-11-04 → 2012-11-04
    Cancel HYDROLANT 1848/12
  5. HYDROLANT 2595/12 · Cable ops2012-11-03 → 2012-12-05
    Seismic survey in progress until further notice by M/V oceanic challenger towing eight 5100 meter long…
  6. HYDROLANT 2589/12 · Surveys2012-11-02 → 2012-11-05
    Underwater operations in progress until further notice by M/V reef despina with submersible vicinity 55-05N…
  7. HYDROLANT 2575/12 · Other2012-11-01 → 2012-11-30
    Ordnance
  8. HYDROLANT 2571/12 · Surveys2012-11-01 → 2012-11-02
    Underwater operations in progress until further notice by M/V reef despina with submersible vicinity…
  9. HYDROLANT 2569/12 · Nav aids2012-11-01 → 2012-11-01
    Firth of Forth
  10. HYDROLANT 2540/12 · Nav aids2012-10-29 → 2012-12-01
    B. red, seven miles
  11. HYDROLANT 2517/12 · Nav aids2012-10-27 → 2012-10-28
    Southern North Sea
  12. HYDROLANT 2488/12 · Nav aids2012-10-24 → 2012-12-05
    Cancel HYDROLANT 1752/12
  13. HYDROLANT 2487/12 · Surveys2012-10-24 → 2012-11-10
    Underwater operations in progress until further notice by M/V mpi adventure vicinity 55-08.77N 001-25.25W
  14. HYDROLANT 2475/12 · Nav aids2012-10-23 → 2012-10-25
    Southern North Sea
  15. HYDROLANT 2473/12 · Cable ops2012-10-23 → 2012-10-27
    Seismic survey in progress until further notice by M/V oceanic challenger and M/V srv vantage towing six 0.5…
  16. HYDROLANT 2469/12 · Derelicts2012-10-22 → 2012-10-23
    Derelict helicopter adrift in 59-28.4N 002-00.9W at 221740Z oct
  17. HYDROLANT 2465/12 · Cable ops2012-10-22 → 2012-10-30
    Underwater operations in progress until further notice by cableship wave sentinel vicinity 52-31.8N 002-13.0E
  18. HYDROLANT 2447/12 · Nav aids2012-10-19 → 2012-10-20
    Scotland-east Coast
  19. HYDROLANT 2419/12 · Nav aids2012-10-16 → 2012-10-16
    Mrcc aberdeen dsc and r/t services at windyhead 57-38N 002-14W off air
  20. HYDROLANT 2396/12 · Nav aids2012-10-13 → 2012-11-05
    Cullercoats 55-04N 001-28W transmitter unreliable

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