North Sea

IHO sea area 4 · -4° to 12° E, 51° to 61° N

in force
1
last 12 months
7
since 1997
4,732
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 aids2,50353%
Other66914%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,731 cancelled

  1. HYDROLANT 1505/99 · Nav aids1999-07-20 → 1999-07-21
    Sandettie lightfloat 51-09N 001-47E light and fog signal unreliable 0800Z to 1500Z daily 20 thru 22 jul
  2. HYDROLANT 1503/99 · Nav aids1999-07-20 → 1999-10-01
    Storm south cardinal buoy established in 51-51.9N 001-38.3E
  3. HYDROLANT 1500/99 · Nav aids1999-07-19 → 1999-07-20
    Storm south cardinal buoy established in 51-51.90N 001-28.33E
  4. HYDROLANT 1484/99 · Cable ops1999-07-16 → 1999-07-22
    Vessel towing 6000 meter long submerged pipeline bundle until further notice between 58-30N 003-07W and…
  5. HYDROLANT 1473/99 · Cable ops1999-07-15 → 1999-07-19
    Cable operations in progress until further notice by cableship monarch vicinity 51-34.5N 001-56.0E
  6. HYDROLANT 1429/99 · Cable ops1999-07-11 → 1999-07-13
    Cable operations in progress until further notice by cableship monarch within one mile of 51-32.2N 001-55.4E
  7. HYDROLANT 1416/99 · Nav aids1999-07-09 → 1999-07-20
    Ruytingen northwest buoy 51-09N 001-57E unlit
  8. HYDROLANT 1406/99 · Cable ops1999-07-08 → 1999-07-11
    Cable operations in progress until further notice by cableship monarch within one mile of 51-34.4N 001-56.2E
  9. HYDROLANT 1405/99 · Cable ops1999-07-08 → 1999-07-10
    Cable operations in progress until further notice by M/V toisa coral with submersible within two miles of…
  10. HYDROLANT 1403/99 · Cable ops1999-07-07 → 1999-07-10
    Cable operations in progress until further notice by M/V toisa mariner with submersible between 52-54.2N…
  11. HYDROLANT 1402/99 · Cable ops1999-07-07 → 1999-07-08
    Cable operations in progress until further notice by M/V toisa coral with submersible within two miles of…
  12. HYDROLANT 1396/99 · Cable ops1999-07-06 → 1999-07-11
    Vessel towing 6000 meter long submerged pipeline bundle until further notice between 58-30N 003-07W and…
  13. HYDROLANT 1391/99 · Cable ops1999-07-06 → 1999-07-07
    Cable operations in progress until 062300Z jul by M/V svitzer magellan towing two cables astern along…
  14. HYDROLANT 1385/99 · Cable ops1999-07-05 → 1999-07-06
    Underwater cable operations in progress until further notice by M/V svitzer magellan towing two cables…
  15. HYDROLANT 1384/99 · Cable ops1999-07-04 → 1999-07-07
    Cable operations in progress until further notice by M/V toisa coral within two miles of 51-16.7N 002-22.0E
  16. HYDROLANT 1376/99 · Cable ops1999-07-03 → 1999-07-04
    Cable operations in progress until further notice by M/V toisa coral within three miles of 51-14.6N 002-17.6E
  17. HYDROLANT 1366/99 · Other1999-07-02 → 1999-07-05
    Underwater ordnance detonations in progress until further notice by M/V aqua marine in 53-55.7N 001-06.1E
  18. HYDROLANT 1358/99 · Cable ops1999-07-01 → 1999-07-08
    Cable operations 010700Z jul until further notice by cableship monarch within one mile of 51-31N 001-55E
  19. HYDROLANT 1357/99 · Cable ops1999-07-01 → 1999-07-01
    Underwater cable operations in progress until further notice by M/V toisa coral with submersible within two…
  20. HYDROLANT 1347/99 · Other1999-06-30 → 1999-09-17
    Pipelaying operations in progress until further notice between 53-46.0N 000-38.2E and 53-59.1N 000-47.4E

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