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 174/10 · Nav aids2010-01-28 → 2010-02-22
    Dover strait nga chart 37120 (3RD ed)
  2. HYDROLANT 161/10 · Nav aids2010-01-27 → 2010-01-27
    Dover strait nga chart 37120 (3RD ed)
  3. HYDROLANT 156/10 · Nav aids2010-01-25 → 2010-01-27
    Nga chart 37040 (1ST ed)
  4. HYDROLANT 113/10 · Nav aids2010-01-18 → 2010-01-19
    Nga chart 37140 (33RD ed)
  5. HYDROLANT 108/10 · Nav aids2010-01-17 → 2010-02-10
    Nga chart 37057 (2ND ed)
  6. HYDROLANT 104/10 · Nav aids2010-01-17 → 2010-02-10
    Nga chart 37166 (2ND ed)
  7. HYDROLANT 82/10 · Surveys2010-01-14 → 2010-01-27
    Underwater operations in progress until further notice by M/V edda fjord vicinity of trackline joining…
  8. HYDROLANT 68/10 · Nav aids2010-01-13 → 2010-01-19
    Nga chart 35000 (26TH ed)
  9. HYDROLANT 59/10 · Nav aids2010-01-12 → 2010-01-20
    Dover strait nga chart 37120 (3RD ed)
  10. HYDROLANT 38/10 · Nav aids2010-01-08 → 2010-01-11
    Nga chart 37057 (2ND ed)
  11. HYDROLANT 26/10 · Other2010-01-07 → 2010-01-15
    Nga chart 37053 (1ST ed)
  12. HYDROLANT 21/10 · Nav aids2010-01-05 → 2010-03-03
    Nga chart 37057 (2ND ed)
  13. HYDROLANT 8/10 · Nav aids2010-01-02 → 2010-01-03
    Nga chart 37057 (2ND ed)
  14. HYDROLANT 2524/09 · Cable ops2009-12-29 → 2010-01-14
    Underwater operations in progress until further notice by cableship north ocean 102 and cableship edda fjord…
  15. HYDROLANT 2506/09 · Nav aids2009-12-25 → 2009-12-25
    Nga chart 37166 (2ND ed)
  16. HYDROLANT 2498/09 · Nav aids2009-12-24 → 2010-01-06
    Nga chart 37120 (3RD ed)
  17. HYDROLANT 2495/09 · Nav aids2009-12-23 → 2009-12-24
    Nga chart 35014 (2ND ed)
  18. HYDROLANT 2488/09 · Nav aids2009-12-22 → 2009-12-24
    Nga chart 37166 (2ND ed)
  19. HYDROLANT 2487/09 · Nav aids2009-12-22 → 2009-12-23
    Nga chart 37058 (2ND ed)
  20. HYDROLANT 2485/09 · Nav aids2009-12-22 → 2009-12-23
    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.