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 537/12 · Nav aids2012-03-08 → 2012-06-02
    Scotland-east Coast
  2. HYDROLANT 526/12 · Nav aids2012-03-07 → 2012-03-09
    England-southeast Coast
  3. HYDROLANT 484/12 · Nav aids2012-03-03 → 2012-06-20
    Cancel HYDROLANT 346/12
  4. HYDROLANT 479/12 · Other2012-03-02 → 2012-05-26
    Ordnance
  5. HYDROLANT 456/12 · Nav aids2012-02-29 → 2012-03-04
    Mrcc humber 55-04N 001-28W mf rt off air
  6. HYDROLANT 427/12 · Nav aids2012-02-25 → 2012-02-26
    Orkney Islands
  7. HYDROLANT 422/12 · Cable ops2012-02-24 → 2012-03-07
    Cable laying operations in progress until further notice by M/V asv pioneer vicinity of trackline between…
  8. HYDROLANT 410/12 · Nav aids2012-02-22 → 2012-04-04
    Dd 53-26.4N 002-23.6E
  9. HYDROLANT 406/12 · Cable ops2012-02-21 → 2012-02-26
    Underwater operations in progress until further notice by cableship wave sentinel with submersible vicinity…
  10. HYDROLANT 404/12 · Nav aids2012-02-21 → 2012-08-11
    Moray Firth
  11. HYDROLANT 401/12 · Nav aids2012-02-21 → 2012-02-21
    Mrcc aberdeen mf r/t service at greg ness 57-08N 002-03W off air
  12. HYDROLANT 390/12 · Nav aids2012-02-19 → 2012-02-20
    Fair Isle
  13. HYDROLANT 364/12 · Nav aids2012-02-14 → 2012-02-15
    Cancel this msg 151300Z feb
  14. HYDROLANT 356/12 · Nav aids2012-02-12 → 2012-09-01
    Dover Strait
  15. HYDROLANT 352/12 · Cable ops2012-02-11 → 2012-02-20
    Underwater operations in progress until further notice by cableship leon thevenin with submersible vicinity…
  16. HYDROLANT 346/12 · Nav aids2012-02-10 → 2012-03-03
    Southern North Sea
  17. HYDROLANT 344/12 · Nav aids2012-02-10 → 2013-02-16
    England-southeast Coast
  18. HYDROLANT 322/12 · Nav aids2012-02-08 → 2012-02-08
    Cancel HYDROLANT 321/12
  19. HYDROLANT 321/12 · Nav aids2012-02-08 → 2012-02-08
    Dover Strait
  20. HYDROLANT 303/12 · Cable ops2012-02-06 → 2012-02-12
    Cable laying operations in progress until further notice by M/V asv pioneer vicinity of trackline between…

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