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 237/21 · Nav aids2021-01-26 → 2021-02-02
    Sunk centre lightfloat 51-50N 001-46E temporarily replaced by buoy rw, pillar, mo(a) 15S RACON (c) AIS
  2. HYDROLANT 225/21 · Nav aids2021-01-25 → 2021-01-26
    Platform 48/12A, 53-32.8N 001-21.6E unlit and aids to navigation inoperative
  3. HYDROLANT 175/21 · Nav aids2021-01-19 → 2021-02-18
    Platform brae b 16/7A, 58-47.58N 001-20.60E unlit
  4. HYDROLANT 173/21 · Nav aids2021-01-18 → 2021-02-01
    Turbines unlit and fog signal inoperable at platforms: a. 53-50.2N 001-39.1E
  5. HYDROLANT 164/21 · Nav aids2021-01-18 → 2021-01-20
    All navigational aids at platform 49/30-A, 53-00.3N 002-53.7E inoperative
  6. HYDROLANT 117/21 · Nav aids2021-01-12 → 2021-01-14
    St
  7. HYDROLANT 102/21 · Surveys2021-01-11 → 2021-01-13
    Survey operations in progress until 15 jan in vicinity of trackline joining 52-51.7N 001-28.0E, 52-59.6N…
  8. HYDROLANT 66/21 · Surveys2021-01-09 → 2021-01-12
    Survey operations 09 thru 11 jan in vicinity of trackline joining 52-51.7N 001-28.0E, 52-59.6N 001-34.5E,…
  9. HYDROLANT 10/21 · Nav aids2021-01-03 → 2021-01-06
    Skadan light 59-30-49N 001-39-10W unreliable
  10. HYDROLANT 3948/20 · Nav aids2020-12-22 → 2020-12-24
    Cgoc aberdeen mf r/t and dsc services at greg ness site 57-07.6N 002-03.2W unreliable until 23 dec
  11. HYDROLANT 3941/20 · Nav aids2020-12-22 → 2020-12-22
    Skadan light 59-30-49N 001-39-10W unreliable
  12. HYDROLANT 3940/20 · Nav aids2020-12-21 → 2020-12-23
    Copinsay light 58-53.8N 002-40.3W unreliable
  13. HYDROLANT 3872/20 · Nav aids2020-12-15 → 2020-12-17
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W off air 0900Z to 1530Z daily 15 thru 17 dec
  14. HYDROLANT 3855/20 · Nav aids2020-12-14 → 2020-12-15
    Platform 48/20-PN 53-27.7N 001-55.0E all aids to navigation inoperative
  15. HYDROLANT 3848/20 · Nav aids2020-12-14 → 2020-12-14
    Cgoc aberdeen mf r/t services at greg ness site 57-07.6N 002-03.2W off air
  16. HYDROLANT 3847/20 · Nav aids2020-12-14 → 2020-12-14
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W off air
  17. HYDROLANT 3830/20 · Nav aids2020-12-10 → 2020-12-13
    Out skerries light 60-25.5N 000-43.7W unreliable
  18. HYDROLANT 3816/20 · Nav aids2020-12-09 → 2020-12-14
    All navigational aids at leman gas platform 49/27-J 53-01.9N 002-13.2E inoperative
  19. HYDROLANT 3805/20 · Nav aids2020-12-07 → 2020-12-08
    St
  20. HYDROLANT 3763/20 · Nav aids2020-12-03 → 2020-12-04
    All navigational aids at caravel platform, 53-25.7N 002-53.9E 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.