North Sea

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

in force
3
last 12 months
3
since 1997
4,727
categories
11

In force now · 3

  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.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.

Longest in force

  1. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. 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 aids2,50053%
Other66814%
Cable ops65814%
Surveys58212%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,724 cancelled

  1. HYDROLANT 3718/20 · Nav aids2020-11-29 → 2020-11-29
    Pentland skerries light 58-41.4N 002-55.5W unreliable
  2. HYDROLANT 3616/20 · Nav aids2020-11-21 → 2020-11-21
    Chiswick platform 53-28.2N 002-55.2E unlit
  3. HYDROLANT 3567/20 · Nav aids2020-11-17 → 2020-11-21
    Platform 49/27G, 53-02.2N 002-23.0E unlit
  4. HYDROLANT 3504/20 · Cable ops2020-11-12 → 2020-11-18
    Cable operations in progress until further notice by cableship sovereign in vicinity 51-56.4N 002-17.1E
  5. HYDROLANT 3502/20 · Nav aids2020-11-11 → 2020-11-12
    Copinsay light 58-53.8N 002-40.3W unreliable
  6. HYDROLANT 3359/20 · Containers2020-11-01 → 2020-11-04
    33 containers adrift in vicinity 58-36N 002-56W at 311156Z oct
  7. HYDROLANT 3347/20 · Containers2020-10-31 → 2020-11-01
    Ten containers adrift in 58-36N 002-56W at 311156Z oct
  8. HYDROLANT 3344/20 · Containers2020-10-31 → 2020-10-31
    Ten containers adrift in 58-36N 000-56W at 311156Z oct
  9. HYDROLANT 3286/20 · Other2020-10-28 → 2020-12-09
    Exposed power cables in vicinity: a. 55-15.8N 000-21.9W
  10. HYDROLANT 3209/20 · Nav aids2020-10-22 → 2020-12-03
    Fog signal at race bank windfarm 53-17.8N 000-46.3E inoperative
  11. HYDROLANT 3096/20 · Surveys2020-10-12 → 2020-11-12
    Survey operations in progress until further notice in area bound by 52-21.1N 001-44.3E, 52-40.3N 002-32.9E,…
  12. HYDROLANT 3017/20 · Nav aids2020-10-04 → 2020-10-06
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W off air
  13. HYDROLANT 2936/20 · Nav aids2020-09-27 → 2021-05-28
    Fog signal unreliable at platforms: a. 48/6B, 53-43.1N 001-07.1E
  14. HYDROLANT 2890/20 · Nav aids2020-09-22 → 2020-10-21
    Thanet wind farm turbine 51-24N 001-38E unlit, fog signals inoperative
  15. HYDROLANT 2831/20 · Cable ops2020-09-17 → 2020-10-05
    Underwater operations in progress until further notice by cableship ile de brehat in vicinity of trackline…
  16. HYDROLANT 2823/20 · Nav aids2020-09-16 → 2020-09-19
    Cgoc aberdeen mf r/t services at greg ness site 57-07.6N 002-03.2W off air
  17. HYDROLANT 2817/20 · Nav aids2020-09-16 → 2020-10-16
    Copinsay light 58-53-46N 002-40-19W unreliable
  18. HYDROLANT 2785/20 · Nav aids2020-09-11 → 2020-10-19
    Light at mast 53-10.7N 002-59.1E unlit
  19. HYDROLANT 2685/20 · Surveys2020-08-31 → 2020-10-12
    Survey operations in progress until further notice in area bound by 52-21.1N 001-44.3E, 52-40.3N 002-32.9E,…
  20. HYDROLANT 2679/20 · Cable ops2020-08-31 → 2020-09-17
    Underwater operations in progress until further notice by cableship ile de brehat in vicinity of trackline…

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