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 474/11 · Nav aids2011-03-23 → 2011-03-23
    Nga chart 35013 (0 ed)
  2. HYDROLANT 469/11 · Surveys2011-03-22 → 2011-09-20
    Salvage operations in progress until further notice in 52-45.9N 004-12.7E
  3. HYDROLANT 461/11 · Nav aids2011-03-21 → 2011-04-23
    Nga chart 37166 (2ND ed)
  4. HYDROLANT 427/11 · Nav aids2011-03-16 → 2011-03-16
    Nga chart 35172 (2ND ed)
  5. HYDROLANT 414/11 · Nav aids2011-03-13 → 2011-06-05
    Nga chart 37010(23RD ed) 1. platform DP8 53-53.5N 003-37.5E fog signal inoperative
  6. HYDROLANT 412/11 · Other2011-03-13 → 2011-03-13
    Nga chart 35013 (0 ed)
  7. HYDROLANT 383/11 · Other2011-03-08 → 2011-03-08
    Nga chart 35172 (2ND ed)
  8. HYDROLANT 382/11 · Other2011-03-07 → 2011-09-27
    Nga chart 37219 (6TH ed)
  9. HYDROLANT 375/11 · Nav aids2011-03-06 → 2011-03-06
    Nga chart 35001 (1ST ed)
  10. HYDROLANT 354/11 · Nav aids2011-03-02 → 2011-03-21
    Nga chart 37166 (2ND ed)
  11. HYDROLANT 349/11 · Nav aids2011-03-01 → 2011-03-03
    Nga chart 37058 (2ND ed)
  12. HYDROLANT 318/11 · Surveys2011-02-23 → 2011-02-27
    Underwater operations in progress until further notice by M/V odyssey explorer within one mile of 56-13.7N…
  13. HYDROLANT 315/11 · Nav aids2011-02-22 → 2011-02-22
    Nga chart 35172 (2ND ed)
  14. HYDROLANT 259/11 · Nav aids2011-02-12 → 2011-02-12
    Nga chart 37057 (2ND ed)
  15. HYDROLANT 234/11 · Other2011-02-08 → 2011-07-02
    Nga chart 37059 (0 ed)
  16. HYDROLANT 229/11 · Other2011-02-06 → 2011-02-08
    Nga chart 37059 (0 ed)
  17. HYDROLANT 227/11 · Other2011-02-05 → 2011-02-08
    Nga chart 37059 (0 ed)
  18. HYDROLANT 214/11 · Other2011-02-03 → 2011-02-09
    Nga chart 37055 (0 ed)
  19. HYDROLANT 212/11 · Nav aids2011-02-03 → 2011-02-04
    Hoxa head light 58-49.3N 003-02.1W unlit
  20. HYDROLANT 185/11 · Nav aids2011-01-31 → 2011-01-31
    Nga chart 35050 (1ST 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.