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
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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 845/11 · Cable ops2011-05-19 → 2011-07-01
    Seismic survey in progress until 052359Z jul by M/V geco triton towing eight 4100 meter long cables in area…
  2. HYDROLANT 828/11 · Other2011-05-16 → 2011-05-22
    Nga chart 37140 (33RD ed)
  3. HYDROLANT 816/11 · Other2011-05-13 → 2011-05-15
    Nga chart 37166 (2ND ed)
  4. HYDROLANT 794/11 · Nav aids2011-05-10 → 2011-07-16
    Nga chart 37028 (27TH ed)
  5. HYDROLANT 785/11 · Cable ops2011-05-09 → 2011-05-19
    Seismic survey in progress until further notice by M/V ramford viking towing 12 6500 meter long cables in…
  6. HYDROLANT 739/11 · Cable ops2011-05-01 → 2011-05-19
    Seismic survey in progress until 312359Z may by M/V geco triton towing 6000 meter long cables in area bound…
  7. HYDROLANT 733/11 · Nav aids2011-04-30 → 2011-05-04
    Nga chart 37120 (3RD ed)
  8. HYDROLANT 729/11 · Cable ops2011-04-29 → 2011-05-11
    Seismic survey in progress until further notice by M/V fugro discovery towing 700 meter long cable in area…
  9. HYDROLANT 702/11 · Nav aids2011-04-25 → 2011-04-26
    Hewett gas field
  10. HYDROLANT 694/11 · Nav aids2011-04-25 → 2011-04-25
    Nga chart 35006 (1ST ed) flamborough light 54-07.0N 000-04.8W unlit
  11. HYDROLANT 681/11 · Nav aids2011-04-21 → 2011-04-23
    Nga chart 35001 (1ST ed)
  12. HYDROLANT 669/11 · Nav aids2011-04-20 → 2011-04-21
    Nga chart 37058 (2ND ed)
  13. HYDROLANT 653/11 · Nav aids2011-04-19 → 2011-04-20
    Nga chart 35066 (1ST ed)
  14. HYDROLANT 636/11 · Cable ops2011-04-16 → 2011-05-09
    Seismic survey in progress until 19 may by M/V ramford viking towing 12 6000 meter long cables in area bound…
  15. HYDROLANT 586/11 · Cable ops2011-04-07 → 2011-04-10
    Underwater operations in progress until further notice by cableship wave sentinel vicinity of trackline…
  16. HYDROLANT 566/11 · Other2011-04-04 → 2011-04-04
    Nga chart 35001 (1ST ed)
  17. HYDROLANT 559/11 · Surveys2011-04-02 → 2011-04-03
    Underwater operations in progress until further notice by M/V discovery within: a. one mile of 51-51.9N…
  18. HYDROLANT 522/11 · Nav aids2011-03-29 → 2011-04-23
    Nga chart 37057 (2ND ed)
  19. HYDROLANT 503/11 · Surveys2011-03-25 → 2011-03-29
    Underwater operations in progress until further notice by M/V discovery within: a. one mile of 51-52.9N…
  20. HYDROLANT 480/11 · Nav aids2011-03-23 → 2011-04-23
    Nga chart 37166 (2ND ed)

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