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 181/11 · Nav aids2011-01-29 → 2011-02-02
    Nga chart 35066 (1ST ed)
  2. HYDROLANT 176/11 · Nav aids2011-01-29 → 2011-04-30
    Nga chart 35014 (3RD ed)
  3. HYDROLANT 175/11 · Nav aids2011-01-28 → 2011-04-20
    Nga chart 37057 (2ND ed)
  4. HYDROLANT 172/11 · Nav aids2011-01-28 → 2011-02-22
    Nga chart 37057 (2ND ed)
  5. HYDROLANT 143/11 · Nav aids2011-01-24 → 2011-03-27
    Nga chart 37057 (2ND ed)
  6. HYDROLANT 130/11 · Nav aids2011-01-21 → 2011-02-22
    Nga chart 37057 (2ND ed)
  7. HYDROLANT 100/11 · Nav aids2011-01-17 → 2011-01-17
    Nga chart 35050 (1ST ed)
  8. HYDROLANT 96/11 · Nav aids2011-01-17 → 2011-01-22
    Nga chart 37055 (0 ed)
  9. HYDROLANT 77/11 · Nav aids2011-01-12 → 2011-02-01
    Nga chart 37059 (0 ed)
  10. HYDROLANT 61/11 · Nav aids2011-01-11 → 2011-03-07
    Nga chart 37219(6TH ed)
  11. HYDROLANT 58/11 · Nav aids2011-01-10 → 2011-02-01
    Nga chart 37059 (0 ed)
  12. HYDROLANT 50/11 · Nav aids2011-01-08 → 2011-02-01
    Minerva gas field
  13. HYDROLANT 21/11 · Other2011-01-05 → 2011-02-09
    Nga chart 37166 (2ND ed)
  14. HYDROLANT 14/11 · Nav aids2011-01-04 → 2011-01-06
    Mrcc humber mf rt and dsc service at flamborough head light 54-07.0N 000-04.9W unreliable
  15. HYDROLANT 12/11 · Nav aids2011-01-04 → 2011-01-06
    Dover strait nga chart 37120 (3RD ed)
  16. HYDROLANT 2520/10 · Surveys2010-12-28 → 2011-01-09
    Underwater operations in progress until further notice by M/V seawell with submersible in 53-55.5N 000-37.5E
  17. HYDROLANT 2503/10 · Nav aids2010-12-25 → 2011-01-01
    Mrcc humber mf rt and dsc service at flamborough head light 54-07.0N 000-04.9W inoperative
  18. HYDROLANT 2464/10 · Nav aids2010-12-20 → 2010-12-21
    Nga chart 35001 (1ST ed)
  19. HYDROLANT 2460/10 · Surveys2010-12-19 → 2010-12-21
    Underwater operations in progress until further notice by M/V fugro searcher towing 300 meter long cable…
  20. HYDROLANT 2456/10 · Other2010-12-18 → 2010-12-19
    Nga chart 35072 (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.