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 2846/21 · Nav aids2021-11-19 → 2021-11-27
    Mrcc aberdeen mf r/t services at gregness site 57-07.7N 002-03.2W unreliable
  2. HYDROLANT 2836/21 · Nav aids2021-11-17 → 2021-11-18
    All navigational aids at platform 49/27-H 53-00.2N 002-12.8E inoperative
  3. HYDROLANT 2831/21 · Nav aids2021-11-17 → 2021-11-18
    Fog signal at platform 48/29-B 53-03.2N 001-41.1E inoperative
  4. HYDROLANT 2790/21 · Other2021-11-11 → 2021-12-23
    Unexploded ordnance in: a. 52-25.1N 002-02.1E
  5. HYDROLANT 2787/21 · Nav aids2021-11-11 → 2021-11-23
    All navigational aids at platform 44/21A 54-14.6N 002-09.2E inoperative
  6. HYDROLANT 2772/21 · Nav aids2021-11-10 → 2021-11-15
    Cgoc aberdeen mf dsc and r/t services at greg ness site 57-07.6N 002-03.2W off air
  7. HYDROLANT 2641/21 · Nav aids2021-10-26 → 2021-10-26
    Fog signal at flamborough head light 54-07.0N 000-05.0W aid restored
  8. HYDROLANT 2628/21 · Nav aids2021-10-25 → 2021-10-30
    Cgoc aberdeen mf dsc and r/t services at greg ness site 57-07.6N 002-03.2W off air
  9. HYDROLANT 2607/21 · Nav aids2021-10-22 → 2021-10-26
    Fog signal at flamborough head light 54-07.0N 000-05.0W inoperative
  10. HYDROLANT 2599/21 · Nav aids2021-10-21 → 2022-03-25
    All navigational aids at platform goldeneye 14/29-A 58-00.1N 000-22.9W inoperative
  11. HYDROLANT 2554/21 · Cable ops2021-10-17 → 2021-10-18
    Cable operations in progress until further notice by M/V sar fame in vicinity of trackline joining 52-29.7N…
  12. HYDROLANT 2534/21 · Nav aids2021-10-14 → 2021-11-24
    Fog signals inoperative in: a. 53-14.9N 000-48.9E
  13. HYDROLANT 2506/21 · Nav aids2021-10-10 → 2021-11-21
    All navigational aids at shamrock platform 53-28.2N 002-55.2E inoperative
  14. HYDROLANT 2493/21 · Nav aids2021-10-08 → 2021-10-13
    Cgoc aberdeen mf r/t services at greg ness site 57-07.6N 002-03.2W off air
  15. HYDROLANT 2486/21 · Nav aids2021-10-07 → 2021-12-26
    All navigational aids at platform 49/27-J 53-02.0N 002-13.1E inoperative
  16. HYDROLANT 2467/21 · Nav aids2021-10-04 → 2021-10-07
    NAVTEX station cullercoats (g) 55-04.4N 001-27.8W off air 0800Z to 1500Z daily 05 thru 07 oct
  17. HYDROLANT 2398/21 · Nav aids2021-09-25 → 2021-09-27
    Isle of may light 56-11.1N 002-33.5W unreliable 251600Z to 270600Z sep
  18. HYDROLANT 2350/21 · Other2021-09-17 → 2021-09-22
    All navigational aids inoperative at platforms: a. 49/27-FD/P 53-02.4N 002-18.9E
  19. HYDROLANT 2341/21 · Exercises2021-09-16 → 2021-09-16
    Hazardous operations 161100Z to 161200Z sep in area bound by 55-44N 001-16W, 55-44N 000-07E, 55-20N 000-17E,…
  20. HYDROLANT 2315/21 · Nav aids2021-09-13 → 2021-09-14
    Pentland skerry light 58-41-23N 002-55-29W unreliable

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