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 1522/23 · Nav aids2023-07-06 → 2023-08-09
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.65N 002-03.22W off air
  2. HYDROLANT 1403/23 · Nav aids2023-06-23 → 2023-11-25
    Cgoc shetland mf r/t services at lerwick site 60-08.90N 001-08.40W off air
  3. HYDROLANT 1400/23 · Nav aids2023-06-23 → 2023-08-04
    All navigational aids at platform 49/23-D 53-18.10N 002-29.90E inoperative
  4. HYDROLANT 1335/23 · Nav aids2023-06-16 → 2023-07-16
    Dsc station bawdsey 51-59.61N 001-24.47E mf r/t and dsc services off air
  5. HYDROLANT 1325/23 · Nav aids2023-06-15 → 2023-07-27
    Sandettie n buoy 51-18.40N 002-04.70E missing
  6. HYDROLANT 1277/23 · Surveys2023-06-09 → 2023-06-18
    Survey operations in progress until further notice by M/V ramform victory in area bound by 60-22.10N…
  7. HYDROLANT 1276/23 · Nav aids2023-06-08 → 2023-06-23
    Cgoc shetland mf r/t and dsc services at st margaret's hope site in 58-49.30N 002-57.40W off air
  8. HYDROLANT 1271/23 · Other2023-06-08 → 2024-02-17
    Offshore wind farm construction area established in area bound by 55-00.60N 001-55.00E, 55-09.40N…
  9. HYDROLANT 1250/23 · Other2023-06-06 → 2023-06-09
    Buoy, grey, reported adrift in 57-28.80N 000-28.40E
  10. HYDROLANT 1230/23 · Cable ops2023-06-02 → 2023-06-19
    Cable operations in progress until further notice by cableship it intrepid along trackline joining 56-15.10N…
  11. HYDROLANT 1229/23 · Surveys2023-06-02 → 2023-07-07
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 6000 meter long cables…
  12. HYDROLANT 1219/23 · Other2023-06-01 → 2023-06-08
    Offshore wind farm construction area established in area bound by 55-00.60N 001-55.00E, 55-09.40N…
  13. HYDROLANT 1214/23 · Nav aids2023-05-31 → 2023-06-01
    NAVTEX station cullercoats (g) 55-04.48N 001-27.79W at reduced power 010800Z to 011100Z jun
  14. HYDROLANT 1168/23 · Nav aids2023-05-26 → 2023-07-06
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.65N 002-03.22W off air
  15. HYDROLANT 1078/23 · Nav aids2023-05-15 → 2023-05-17
    NAVTEX station cullercoats (g) 55-04.00N 001-28.00W at reduced power 0800Z to 1600Z daily 16 and 17 may
  16. HYDROLANT 1067/23 · Nav aids2023-05-15 → 2023-05-16
    All navigational aids at platform 48/29-C 53-05.80N 001-45.80E inoperative
  17. HYDROLANT 1047/23 · Nav aids2023-05-12 → 2023-05-23
    Fog signal at garrow platform in 54-16.40N 000-59.80E inoperative
  18. HYDROLANT 1025/23 · Nav aids2023-05-10 → 2023-05-11
    Cairnbulg briggs light 57-41.10N 001-56.50W unlit
  19. HYDROLANT 975/23 · Nav aids2023-05-05 → 2023-06-16
    Dsc station bawdsey 51-59.61N 001-24.49E mf r/t and dsc services off air
  20. HYDROLANT 963/23 · Nav aids2023-05-04 → 2023-06-15
    Sandettie n buoy 51-18.40N 002-04.70E missing

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