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 728/21 · Nav aids2021-03-14 → 2021-04-25
    All navigational aids at shamrock platform, 53-28.2N 002-55.2E inoperative
  2. HYDROLANT 721/21 · Nav aids2021-03-14 → 2021-03-14
    Cgoc shetland mf r/t services at lerwick site 60-08.9N 001-08.3W off air
  3. HYDROLANT 698/21 · Nav aids2021-03-11 → 2021-04-23
    All navigational aids at platform 48/13-PB 53-36.8N 001-31.6E unreliable
  4. HYDROLANT 673/21 · Nav aids2021-03-08 → 2021-03-29
    All navigational aids at platform 48/29-B, 53-03.3N 001-41.0E inoperative
  5. HYDROLANT 664/21 · Nav aids2021-03-07 → 2021-03-07
    Cgoc shetland mf r/t services at lerwick site 60-08.9N 001-08.3W off air
  6. HYDROLANT 498/21 · Nav aids2021-02-21 → 2021-02-22
    Cgoc shetland mf r/t services at lerwick site 60-08.9N 001-08.3W off air
  7. HYDROLANT 460/21 · Nav aids2021-02-17 → 2021-02-17
    Cgoc shetland mf dsc and r/t services at st margarets hope site 58-49.3N 002-57.4W off air
  8. HYDROLANT 437/21 · Nav aids2021-02-15 → 2021-02-17
    All navigational aids at platform 44/23 kelvin, 54-20.0N 002-28.8E inoperative
  9. HYDROLANT 435/21 · Nav aids2021-02-14 → 2021-02-15
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W off air
  10. HYDROLANT 431/21 · Other2021-02-14 → 2022-01-14
    Unexploded ordinance in 52-26.63N 001-55.87E
  11. HYDROLANT 422/21 · Nav aids2021-02-12 → 2021-02-18
    All navigational aids at shamrock platform, 53-28.2N 002-55.2E inoperative
  12. HYDROLANT 412/21 · Nav aids2021-02-11 → 2021-02-13
    Cromer light 52-55.5N 001-19.0E unreliable
  13. HYDROLANT 400/21 · Nav aids2021-02-10 → 2021-02-10
    Auskerry light 59-01.5N 002-34.3W unreliable
  14. HYDROLANT 384/21 · Nav aids2021-02-09 → 2021-02-15
    Cgoc aberdeen mf r/t services at greg ness site 57-07.6N 002-03.2W off air
  15. HYDROLANT 377/21 · Nav aids2021-02-09 → 2021-02-11
    All aids to navigation at platform 49/18B, 53-23.5N 002-31.5E inoperative
  16. HYDROLANT 363/21 · Nav aids2021-02-08 → 2021-02-09
    Auskerry light 59-01.5N 002-34.3W unreliable
  17. HYDROLANT 357/21 · Nav aids2021-02-07 → 2021-02-16
    Cgoc shetland mf r/t services at lerwick site 60-08.9N 001-08.3W unreliable
  18. HYDROLANT 309/21 · Nav aids2021-02-02 → 2021-09-11
    Sunk centre lightfloat 51-50N 001-46E temporarily replaced by buoy rw, pillar, mo(a) 15S RACON (c) AIS
  19. HYDROLANT 257/21 · Nav aids2021-01-28 → 2021-01-31
    All navigational aids at platform 49/23-D 53-18.2N 002-30.0E inoperative
  20. HYDROLANT 241/21 · Nav aids2021-01-26 → 2021-01-26
    Fog signal at turbine 51-26.5N 001-04.5E 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.