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 1999/10 · Nav aids2010-10-22 → 2010-10-22
    Nga chart 37120 (3RD ed)
  2. HYDROLANT 1990/10 · Nav aids2010-10-20 → 2010-10-23
    Nga chart 35072 (1ST ed)
  3. HYDROLANT 1988/10 · Nav aids2010-10-20 → 2010-10-22
    Nga chart 37244 (11TH ed)
  4. HYDROLANT 1977/10 · Nav aids2010-10-18 → 2010-11-20
    Nga chart 37057 (2ND ed)
  5. HYDROLANT 1975/10 · Nav aids2010-10-18 → 2010-10-19
    Nga chart 37057 (2ND ed)
  6. HYDROLANT 1968/10 · Surveys2010-10-17 → 2010-10-29
    Underwater operations in progress until further notice by M/V ocean discovery within 4.5 miles of 56-16N…
  7. HYDROLANT 1961/10 · Nav aids2010-10-15 → 2010-10-18
    Nga chart 37120 (3RD ed)
  8. HYDROLANT 1947/10 · Nav aids2010-10-13 → 2010-11-23
    Barque gas field
  9. HYDROLANT 1912/10 · Nav aids2010-10-08 → 2010-10-08
    Nga chart 35010 (1ST ed)
  10. HYDROLANT 1901/10 · Nav aids2010-10-06 → 2010-10-07
    Nga chart 37166 (3RD ed)
  11. HYDROLANT 1881/10 · Nav aids2010-10-03 → 2010-10-05
    Nga chart 37055 (0 ed)
  12. HYDROLANT 1870/10 · Nav aids2010-10-01 → 2010-10-04
    Nga chart 35013 (0 ed)
  13. HYDROLANT 1869/10 · Nav aids2010-10-01 → 2010-10-02
    Nga chart 37166 (3RD ed)
  14. HYDROLANT 1848/10 · Nav aids2010-09-29 → 2010-09-30
    Nga chart 37166 (3RD ed)
  15. HYDROLANT 1835/10 · Nav aids2010-09-28 → 2011-02-26
    Nga chart 37055 (0 ed)
  16. HYDROLANT 1828/10 · Cable ops2010-09-27 → 2010-10-12
    Underwater operations in progress until further notice by cableship wave sentinel with submersible vicinity…
  17. HYDROLANT 1824/10 · Surveys2010-09-26 → 2010-09-27
    Underwater operations in progress until further notice by M/V noordhoek singapore with submersible vicinity…
  18. HYDROLANT 1808/10 · Surveys2010-09-24 → 2010-09-25
    Underwater operations in progress until further notice by M/V noordhoek singapore with submersible vicinity…
  19. HYDROLANT 1806/10 · Cable ops2010-09-24 → 2010-09-25
    Underwater operations in progress until further notice by cableship wave sentinel with submersible vicinity…
  20. HYDROLANT 1805/10 · Surveys2010-09-24 → 2010-09-24
    Underwater operations in progress until further notice by M/V noordhoek singapore with submersible vicinity…

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