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 661/08 · Nav aids2008-04-18 → 2008-04-19
    Mrcc shetland 60-09N 001-08W dsc services unreliable
  2. HYDROLANT 659/08 · Nav aids2008-04-17 → 2008-04-18
    Nga chart 37120 (3RD ed)
  3. HYDROLANT 652/08 · Other2008-04-16 → 2008-04-17
    Nga chart 35061 (2ND ed)
  4. HYDROLANT 594/08 · Other2008-04-09 → 2008-05-21
    Nga chart 37244(11TH ed)
  5. HYDROLANT 579/08 · Nav aids2008-04-07 → 2008-04-14
    Nga chart 37057 (2ND ed)
  6. HYDROLANT 564/08 · Other2008-04-05 → 2008-04-07
    Nga chart 35061 (2ND ed)
  7. HYDROLANT 563/08 · Nav aids2008-04-05 → 2009-03-21
    Nga chart 37057 (2ND ed)
  8. HYDROLANT 535/08 · Nav aids2008-03-30 → 2008-04-04
    GPS jamming exercises 0800Z to 1800Z daily 31 mar thru 04 apr in area bound by 54-07N 000-05W, 54-05N…
  9. HYDROLANT 533/08 · Nav aids2008-03-29 → 2008-04-01
    Nga chart 35014 (1ST ed)
  10. HYDROLANT 520/08 · Nav aids2008-03-28 → 2008-05-08
    Nga chart 37059 (0 ed)
  11. HYDROLANT 510/08 · Cable ops2008-03-26 → 2008-04-03
    Underwater operations in progress until further notice by cableship lle de brehat vicinity 51-04.5N 001-47.1E
  12. HYDROLANT 496/08 · Cable ops2008-03-24 → 2008-03-26
    Underwater operations in progress until further notice by cableship ille de brehat vicinity 51-07.0N 001-54.0E
  13. HYDROLANT 480/08 · Other2008-03-21 → 2008-03-21
    Nga chart 35061 (2ND ed)
  14. HYDROLANT 464/08 · Nav aids2008-03-16 → 2008-03-17
    Nga chart 35035 (0 ed)
  15. HYDROLANT 433/08 · Nav aids2008-03-12 → 2008-03-13
    Nga chart 37055 (0 ed)
  16. HYDROLANT 425/08 · Nav aids2008-03-11 → 2008-03-12
    Lowestoft light 52-29.2N 001-45.5E missing
  17. HYDROLANT 421/08 · Nav aids2008-03-11 → 2008-03-13
    Nga chart 37140 (33RD ed)
  18. HYDROLANT 408/08 · Surveys2008-03-08 → 2008-04-11
    Underwater operations in progress until further notice by M/V acergy osprey along trackline between 53-02.4N…
  19. HYDROLANT 404/08 · Nav aids2008-03-07 → 2008-03-07
    Nga chart 35035 (0 ed)
  20. HYDROLANT 399/08 · Nav aids2008-03-06 → 2008-03-06
    Nga chart 37055 (0 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.