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 954/23 · Nav aids2023-05-03 → 2023-05-04
    Lowestoft light 52-29.20N 001-45.30E unreliable
  2. HYDROLANT 905/23 · Nav aids2023-04-28 → 2023-06-08
    Cgoc shetland mf r/t and dsc services at st margaret's hope site in 58-49.30N 002-57.40W off air
  3. HYDROLANT 890/23 · Nav aids2023-04-26 → 2023-04-26
    Cromer light 52-55.50N 001-19.00E unreliable
  4. HYDROLANT 886/23 · Nav aids2023-04-25 → 2023-04-28
    Platform 47/8-AD 53-49.50N 000-28.20E unlit
  5. HYDROLANT 825/23 · Other2023-04-17 → 2023-05-05
    Fog signal inoperable at turbines: a. R34, 53-59.10N 001-27.00E
  6. HYDROLANT 799/23 · Nav aids2023-04-14 → 2023-05-26
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.65N 002-03.22W off air
  7. HYDROLANT 794/23 · Nav aids2023-04-13 → 2023-05-04
    Sandettie n buoy 51-18.40N 002-04.70E unlit
  8. HYDROLANT 790/23 · Nav aids2023-04-12 → 2023-04-13
    Sandettie n buoy 51-18.40N 002-04.70E unlit
  9. HYDROLANT 778/23 · Nav aids2023-04-11 → 2023-04-12
    Platform 47/3C 53-57.00N 000-35.60E unlit
  10. HYDROLANT 716/23 · Surveys2023-04-03 → 2023-05-18
    Survey operations in progress until further notice by M/V amazon conqueror towing eight 4700 meter long…
  11. HYDROLANT 706/23 · Derelicts2023-04-01 → 2023-04-02
    Derelict S/V adrift in 52-06.00N 001-57.00E at 012100Z apr
  12. HYDROLANT 667/23 · Nav aids2023-03-27 → 2023-04-01
    Cromer light 52-55.50N 001-19.00E unreliable
  13. HYDROLANT 651/23 · Nav aids2023-03-24 → 2023-03-24
    Dsc station bawdsey 51-59.61N 001-24.49E mf r/t and dsc services off air
  14. HYDROLANT 579/23 · Nav aids2023-03-17 → 2023-04-28
    Cgoc shetland mf r/t and dsc services at st margaret's hope site in 58-49.30N 002-57.40W off air
  15. HYDROLANT 560/23 · Nav aids2023-03-14 → 2023-03-16
    Symbister ness light 60-20.40N 001-02.30W unlit
  16. HYDROLANT 514/23 · Nav aids2023-03-07 → 2023-03-07
    RACON at east goodwin lightfloat 51-13.30N 001-36.40E inoperative
  17. HYDROLANT 486/23 · Nav aids2023-03-03 → 2023-04-14
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.65N 002-03.22W off air
  18. HYDROLANT 484/23 · Wrecks2023-03-02 → 2023-03-03
    Sheringham shoal wind farm turbines unlit in: a. 53-10.40N 001-04.80E
  19. HYDROLANT 432/23 · Nav aids2023-02-25 → 2023-02-27
    Cgoc shetland mf r/t service at lerwick site 60-08.92N 001-08.43W unreliable
  20. HYDROLANT 337/23 · Nav aids2023-02-10 → 2023-03-24
    Dsc station bawdsey 51-59.61N 001-24.49E, mf r/t and dsc services off air

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