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 3140/21 · Nav aids2021-12-24 → 2022-01-09
    All navigational aids at platform 48/13-PB 53-36.8N 001-31.6E inoperative
  2. HYDROLANT 3118/21 · Nav aids2021-12-21 → 2021-12-25
    Fog signal at platform 42/30-C, 54-05.0N 000-49.5E inoperative
  3. HYDROLANT 3102/21 · Nav aids2021-12-18 → 2022-01-04
    Bell rock light 56-26.1N 002-23.2W unlit
  4. HYDROLANT 3059/21 · Nav aids2021-12-14 → 2021-12-18
    Bell rock light 56-26.1N 002-23.2W unlit
  5. HYDROLANT 3030/21 · Wrecks2021-12-11 → 2023-07-14
    Dangerous wreck reported in vicinity 52-14.5N 001-42.6E
  6. HYDROLANT 3024/21 · Nav aids2021-12-10 → 2021-12-30
    Cgoc aberdeen mf r/t service at gregness 57-07.7N 002-03.2W off air
  7. HYDROLANT 3005/21 · Nav aids2021-12-08 → 2021-12-09
    All navigational aids at tethys platform 53-39.0N 002-03.3E inoperative
  8. HYDROLANT 2994/21 · Nav aids2021-12-07 → 2021-12-10
    Thanet wind farm turbine 51-24.4N 001-40.8E unlit and fog signals inoperative
  9. HYDROLANT 2979/21 · Nav aids2021-12-04 → 2021-12-13
    Outer sand buoy 53-36.4N 000-29.6E unlit
  10. HYDROLANT 2962/21 · Nav aids2021-12-01 → 2022-01-02
    Fog signals inoperative in: a. 53-14.9N 000-48.9E
  11. HYDROLANT 2947/21 · Nav aids2021-11-30 → 2021-12-17
    All navigational aids at platform 49/30-A, 53-00.3N 002-53.7E inoperative
  12. HYDROLANT 2944/21 · Nav aids2021-11-30 → 2021-12-01
    NAVTEX station cullercoats (g) 55-02N 001-26W off air 0900Z to 1530Z daily 30 nov and 01 dec
  13. HYDROLANT 2942/21 · Nav aids2021-11-29 → 2021-11-30
    Auskerry light 59-01.5N 002-34.3W unlit
  14. HYDROLANT 2941/21 · Nav aids2021-11-29 → 2021-11-30
    Mrcc aberdeen dsc and r/t service at fife ness site 56-16.7N 002-35.3W off air
  15. HYDROLANT 2940/21 · Nav aids2021-11-29 → 2021-11-29
    Mrcc aberdeen mf dsc and r/t service at fifeness 56-16.7N 002-35.3W off air
  16. HYDROLANT 2927/21 · Nav aids2021-11-27 → 2021-12-09
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.7N 002-03.2W off air
  17. HYDROLANT 2923/21 · Nav aids2021-11-27 → 2021-11-27
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.7N 002-03.2W off air
  18. HYDROLANT 2887/21 · Nav aids2021-11-24 → 2021-12-01
    Fog signals inoperative in: a. 53-14.9N 000-48.9E
  19. HYDROLANT 2862/21 · Nav aids2021-11-21 → 2022-01-04
    All navigational aids at shamrock platform 53-28.2N 002-55.2E inoperative
  20. HYDROLANT 2859/21 · Nav aids2021-11-21 → 2021-12-06
    Bell rock light 56-26.1N 002-23.2W unlit and RACON 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.