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 2592/18 · Cable ops2018-08-13 → 2018-08-22
    Underwater operations in progress until further notice by cableship sovereign in vicinity 52-21.0N 002-51.0E
  2. HYDROLANT 2566/18 · Surveys2018-08-11 → 2018-09-21
    Survey operations in progress until further notice by M/V sanco swift towing 12 9000 meter long cables in…
  3. HYDROLANT 2545/18 · Surveys2018-08-08 → 2018-08-11
    Underwater operations in progress until further notice by M/V skandi constructor with submersible in…
  4. HYDROLANT 2541/18 · Surveys2018-08-08 → 2018-09-20
    Underwater operations in progress until further notice by M/V ocean vantage in area bound by 56-41N 001-57W,…
  5. HYDROLANT 2533/18 · Other2018-08-07 → 2018-09-19
    Unexploded ordnance in area bound by 52-05N 001-37E, 52-05N 001-45E, 51-58N 001-30E, 52-00N 001-30E
  6. HYDROLANT 2532/18 · Cable ops2018-08-07 → 2018-08-13
    Underwater operations in progress until further notice by cableship sovereign in vicinity 52-17.3N 002-18.9E
  7. HYDROLANT 2514/18 · Nav aids2018-08-04 → 2018-08-04
    Cgoc aberdeen mf r/t service at greg ness 57-07.6N 002-03.2W unreliable
  8. HYDROLANT 2498/18 · Nav aids2018-08-02 → 2018-08-06
    All navigational aids at platform 42/30-C, 54-05.0N 000-49.5E inoperative
  9. HYDROLANT 2487/18 · Debris2018-08-01 → 2018-08-04
    Fishing gear adrift in vicinity of 51-49.9N 001-58.1E
  10. HYDROLANT 2475/18 · Nav aids2018-08-01 → 2018-08-01
    Isle of may light 56-11.1N 002-33.5W unreliable
  11. HYDROLANT 2469/18 · Nav aids2018-07-31 → 2018-07-31
    All navigational aids and fog signal at dudgeon wind farm turbine A5, 53-15.7N 001-19.2E inoperative
  12. HYDROLANT 2449/18 · Surveys2018-07-31 → 2018-08-01
    Underwater operations in progress until further notice by M/V skandi constructor with submersible in…
  13. HYDROLANT 2442/18 · Nav aids2018-07-30 → 2018-08-17
    Navigational aids at thanet windfarm turbine 51-27.45N 001-36.37E unreliable
  14. HYDROLANT 2381/18 · Other2018-07-24 → 2018-07-26
    Navigation prohibited until further notice unless authorized by national maritime operations center or…
  15. HYDROLANT 2354/18 · Nav aids2018-07-20 → 2018-08-30
    Platform 48/7B-HOTON, 53-48.2N 001-12.3E unlit
  16. HYDROLANT 2345/18 · Other2018-07-19 → 2018-07-24
    Navigation prohibited until further notice unless authorized by national maritime operations centre or…
  17. HYDROLANT 2307/18 · Surveys2018-07-15 → 2018-07-18
    Underwater operations in progress until further notice by M/V skandi constructor in vicinity 51-19.6N…
  18. HYDROLANT 2297/18 · Nav aids2018-07-13 → 2018-08-24
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  19. HYDROLANT 2234/18 · Nav aids2018-07-09 → 2018-07-12
    Dgps station at north foreland light 51-22.5N 001-26.7E off air 0800Z to 1600Z daily 10 thru 12 jul
  20. HYDROLANT 2195/18 · Cable ops2018-07-06 → 2018-08-17
    Cable operations in progress until further notice by cableship connector and M/V lange wrapper in area bound…

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