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 1063/19 · Other2019-04-04 → 2019-04-04
    All navigational aids at race bank windfarm inoperative 040600Z to 131200Z apr in vicinity of trackline…
  2. HYDROLANT 1032/19 · Nav aids2019-04-01 → 2019-05-13
    Cgoc humber mf dsc and r/t services at langham 52-56.5N 000-57.2E off air
  3. HYDROLANT 1012/19 · Debris2019-03-29 → 2019-04-01
    Fishing gear, marked by buoys adrift in vicinity of trackline joining 51-46.5N 001-32.7E and 51-44.8N…
  4. HYDROLANT 973/19 · Wrecks2019-03-27 → 2019-08-03
    Dangerous wreck, least depth 14.1 meters, in 55-07.01N 001-27.35W
  5. HYDROLANT 957/19 · Nav aids2019-03-27 → 2019-03-28
    Dgps station at sumburgh head light 59-51.2N 001-16.5W off air 1000Z to 1500Z daily 27 and 28 mar
  6. HYDROLANT 932/19 · Derelicts2019-03-24 → 2019-03-27
    Six meter vessel adrift in 51-22.5N 001-28.2E at 241550Z mar
  7. HYDROLANT 924/19 · Nav aids2019-03-22 → 2019-03-29
    Fog signal at platform jacky, 58-11.0N 002-58.8W inoperative
  8. HYDROLANT 900/19 · Nav aids2019-03-20 → 2019-05-01
    All navigational aids at tethys platform 53-39.0N 002-03.5E inoperative
  9. HYDROLANT 888/19 · Nav aids2019-03-19 → 2019-04-30
    All navigational aids at platform 15/17-A, 58-25N 000-20E inoperative
  10. HYDROLANT 841/19 · Nav aids2019-03-16 → 2019-03-22
    Fog signals at platform 48/20, 53-27.0N 001-53.0E inoperative
  11. HYDROLANT 836/19 · Nav aids2019-03-15 → 2019-04-08
    All navigational aids at platform 11/30-A, 58-06.9N 003-05.3W inoperative
  12. HYDROLANT 805/19 · Nav aids2019-03-13 → 2019-04-24
    All navigational aids at wenlock platform, 53-35.3N 002-17.7E inoperative
  13. HYDROLANT 794/19 · Nav aids2019-03-13 → 2019-04-24
    Cgoc aberdeen mf dsc services at greg ness site 57-08.3N 002-02.9W unreliable
  14. HYDROLANT 771/19 · Nav aids2019-03-11 → 2019-04-12
    Platform 49/19 bg, 53-24.1N 002-39.3E unlit and fog signal inoperative
  15. HYDROLANT 763/19 · Other2019-03-10 → 2019-03-28
    Unexploded ordnance in 52-18.32N 002-15.07E
  16. HYDROLANT 760/19 · Nav aids2019-03-10 → 2019-03-11
    Kinnairds head light 57-41.9N 002-00.2W, unlit
  17. HYDROLANT 759/19 · Nav aids2019-03-10 → 2019-03-11
    Platform 49/19 bg, 53-24.1N 002-39.3E unlit
  18. HYDROLANT 735/19 · Nav aids2019-03-07 → 2019-04-19
    Main navigational lights at bessemer gas platform, 53-11.9N 002-29.1E inoperative
  19. HYDROLANT 662/19 · Nav aids2019-02-28 → 2019-03-03
    Bamburgh light 55-36.9N 001-43.5W unreliable
  20. HYDROLANT 634/19 · Nav aids2019-02-27 → 2019-03-06
    All navigational aids at platform 48/11-B, 53-33.0N 001-04.6E inoperative

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