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 1976/22 · Other2022-08-09 → 2022-09-20
    Unexploded ordnance in: a. 55-04.38N 001-31.43E
  2. HYDROLANT 1973/22 · Other2022-08-08 → 2022-08-16
    Counter-pollution operations in progress until further notice in area within five miles of 51-22.00N…
  3. HYDROLANT 1966/22 · Other2022-08-07 → 2022-08-08
    Oil spill response operations in progress until further notice in area within five miles of 51-27.30N…
  4. HYDROLANT 1956/22 · Surveys2022-08-06 → 2022-10-05
    Survey operations in progress until further notice by M/V ramform atlas towing 15 5000 meter long cables in…
  5. HYDROLANT 1953/22 · Nav aids2022-08-06 → 2022-09-16
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.7N 002-03.2W off air
  6. HYDROLANT 1945/22 · Wrecks2022-08-05 → 2022-09-16
    Dangerous wreck, least depth 15.6 meters, in 54-40.10N 002-26.80E
  7. HYDROLANT 1905/22 · Cable ops2022-08-01 → 2022-08-30
    Cable operations in progress until further notice by cableship responder in vicinity of trackline joining…
  8. HYDROLANT 1885/22 · Other2022-07-29 → 2022-07-30
    Salvage and oil spill response operations in progress until 300700Z jul in area within five miles of…
  9. HYDROLANT 1873/22 · Nav aids2022-07-28 → 2022-07-28
    Rova head directional light 60-11.40N 001-08.50W unlit
  10. HYDROLANT 1872/22 · Nav aids2022-07-28 → 2022-07-28
    Rova head light 60-11.40N 001-08.50W unlit
  11. HYDROLANT 1867/22 · Nav aids2022-07-27 → 2022-09-07
    Mdw buoy 51-19.20N 001-59.30E missing
  12. HYDROLANT 1836/22 · Debris2022-07-22 → 2022-07-25
    Fishing gear adrift in 58-17.70N 002-33.50E at 221731Z jul
  13. HYDROLANT 1822/22 · Nav aids2022-07-21 → 2022-07-21
    Rova head light 60-11.40N 001-08.50W unlit
  14. HYDROLANT 1814/22 · Other2022-07-20 → 2022-07-22
    500 meter safety zone established in 53-09.30N 002-44.00E
  15. HYDROLANT 1813/22 · Other2022-07-20 → 2022-07-22
    500 meter safety zone established in 56-35.00N 002-28.40E
  16. HYDROLANT 1797/22 · Surveys2022-07-18 → 2022-07-28
    Underwater operations in progress until further notice by M/V uilenspiegel and c/s responder in vicinity of…
  17. HYDROLANT 1778/22 · Surveys2022-07-16 → 2022-07-20
    Survey operations in progress until further notice by M/V nora b in vicinity of trackline joining 51-22.80N…
  18. HYDROLANT 1771/22 · Nav aids2022-07-15 → 2022-08-26
    All navigational aids at platform 49/27-J in 53-01.90N 002-13.10E inoperative
  19. HYDROLANT 1760/22 · Nav aids2022-07-13 → 2022-07-14
    RACON at inter bank buoy 51-16.50N 001-52.30E inoperative
  20. HYDROLANT 1741/22 · Nav aids2022-07-10 → 2022-07-11
    Isle of may light 56-11.1N 002-33.5W 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.