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 39/12 · Nav aids2012-01-06 → 2012-01-09
    Orkney Islands
  2. HYDROLANT 31/12 · Nav aids2012-01-04 → 2012-01-10
    Cancel HYDROLANT 12/12
  3. HYDROLANT 22/12 · Nav aids2012-01-04 → 2012-01-06
    Southern North Sea
  4. HYDROLANT 19/12 · Other2012-01-04 → 2012-01-09
    Dover Strait
  5. HYDROLANT 17/12 · Nav aids2012-01-03 → 2012-03-29
    Cancel HYDROLANT 4/12(54,56)
  6. HYDROLANT 12/12 · Nav aids2012-01-02 → 2012-01-04
    Graemsay island rear range light 58-56.2N 003-16.3W
  7. HYDROLANT 3/12 · Nav aids2012-01-01 → 2012-03-25
    Cancel HYDROLANT 1949/11
  8. HYDROLANT 2303/11 · Nav aids2011-12-31 → 2012-01-01
    Southern North Sea
  9. HYDROLANT 2291/11 · Nav aids2011-12-31 → 2011-12-31
    Cancel HYDROLANT 2273/11
  10. HYDROLANT 2287/11 · Nav aids2011-12-30 → 2012-01-02
    Cancel HYDROLANT 2248/11
  11. HYDROLANT 2273/11 · Nav aids2011-12-30 → 2011-12-31
    Orkney Islands-east Coast
  12. HYDROLANT 2261/11 · Other2011-12-27 → 2011-12-30
    Numerous fishing traps adrift in 60-42.94N 000-03.45W at 271500Z dec
  13. HYDROLANT 2258/11 · Cable ops2011-12-27 → 2012-01-02
    Underwater operations in progress until further notice by cableship wave sentinel vicinity 52-24N 002-56E
  14. HYDROLANT 2249/11 · Nav aids2011-12-26 → 2012-02-06
    Nga chart 37166 1. fog signal at platform 49/12-AR 53-32.1N 002-15.2E inoperative
  15. HYDROLANT 2248/11 · Nav aids2011-12-26 → 2011-12-30
    Orkney Islands
  16. HYDROLANT 2247/11 · Nav aids2011-12-25 → 2011-12-26
    Southern North Sea
  17. HYDROLANT 2229/11 · Nav aids2011-12-23 → 2011-12-24
    Mrcc shetland 60-09N 001-08W mf r/t and dsc services unreliable
  18. HYDROLANT 2222/11 · Nav aids2011-12-22 → 2011-12-24
    Nga chart 35058 (1ST ed)
  19. HYDROLANT 2220/11 · Other2011-12-21 → 2012-04-26
    Nga chart 35004(1ST ed)
  20. HYDROLANT 2219/11 · Cable ops2011-12-21 → 2011-12-24
    Underwater operations in progress until further notice by cableship wave sentinel vicinity 52-32N 002-13E

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