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 2672/20 · Surveys2020-08-30 → 2020-08-31
    Survey operations in progress until further notice by M/V despina, M/V fugro frontier and M/V normand flower…
  2. HYDROLANT 2609/20 · Wrecks2020-08-24 → 2020-10-05
    Dangerous wreck, depth 15.3 meters, in 51-45.40N 001-30.98E
  3. HYDROLANT 2585/20 · Surveys2020-08-21 → 2020-10-06
    Survey operations in progress until further notice by M/V amazon warrior towing eight 7500 meter long cables…
  4. HYDROLANT 2542/20 · Nav aids2020-08-17 → 2020-08-19
    Cgoc aberdeen mf r/t and dsc services at greg ness site 57-07.6N 002-03.2W off air
  5. HYDROLANT 2540/20 · Surveys2020-08-16 → 2020-08-30
    Survey operations in progress until further notice by M/V despina, M/V fugro frontier and M/V normand flower…
  6. HYDROLANT 2516/20 · Wrecks2020-08-14 → 2020-08-18
    Dangerous wreck, least depth 16.8 meters, in 53-33.28N 000-07.75E
  7. HYDROLANT 2513/20 · Cable ops2020-08-14 → 2020-09-18
    Underwater operations in progress until further notice by M/V cableship ile de batz in area bound by…
  8. HYDROLANT 2463/20 · Surveys2020-08-08 → 2020-09-19
    Survey operations in progress until further notice by M/V hydrograf towing equipment along trackline joining…
  9. HYDROLANT 2402/20 · Nav aids2020-07-31 → 2020-09-11
    Light at mast 53-10.7N 002-59.1E unreliable
  10. HYDROLANT 2381/20 · Nav aids2020-07-30 → 2020-08-25
    Shamrock platform 53-28.2N 002-55.2E light unreliable
  11. HYDROLANT 2367/20 · Surveys2020-07-29 → 2020-08-16
    Survey operations in progress until further notice by M/V atlantis dweller, M/V fugro frontier and M/V…
  12. HYDROLANT 2364/20 · Surveys2020-07-29 → 2020-08-17
    Survey operations in progress until further notice by M/V sw amundsen towing eight 3800 meter long cables in…
  13. HYDROLANT 2328/20 · Surveys2020-07-24 → 2020-07-25
    Survey operations in progress until further notice by M/V hydrograf in vicinity of trackline joining…
  14. HYDROLANT 2308/20 · Surveys2020-07-22 → 2020-07-29
    Survey operations in progress further notice by M/V atlantis dweller and M/V fugro frontier in area bound by…
  15. HYDROLANT 2226/20 · Other2020-07-15 → 2020-07-15
    Underwater ordnance detonation 150800Z to 151230Z jul in vicinity 53-21.8N 000-23.3E
  16. HYDROLANT 2224/20 · Other2020-07-15 → 2020-07-15
    Underwater ordnance detonation 150800Z to 151100Z jul in vicinity 53-21.8N 000-23.3E
  17. HYDROLANT 2218/20 · Other2020-07-14 → 2020-07-14
    Underwater ordnance detonation 140730Z jul in vicinity 53-34.0N 000-38.1E
  18. HYDROLANT 2217/20 · Nav aids2020-07-14 → 2020-07-15
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W off air 0915Z to 1530Z daily 14 and 15 jul
  19. HYDROLANT 2212/20 · Other2020-07-13 → 2020-07-13
    Underwater ordnance detonation 131230Z jul in vicinity of area within one mile of 53-33.9N 000-38.1E
  20. HYDROLANT 2200/20 · Other2020-07-12 → 2020-07-12
    Ordnance detonation 120540Z to 121200Z jul by M/V noordhoek pathfinder in vicinity 53-33.9N 000-38.2E

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