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 698/18 · Other2018-02-28 → 2018-04-11
    Unexploded ordnance in 53-53.05N 001-39.55E
  2. HYDROLANT 692/18 · Nav aids2018-02-28 → 2018-04-11
    All navigational aids at platform 47/4B, 53-59.0N 000-47.3E inoperative
  3. HYDROLANT 654/18 · Nav aids2018-02-25 → 2018-02-27
    Platform 14/29A goldeneye, 58-00.1N 000-22.9W lights unreliable
  4. HYDROLANT 630/18 · Wrecks2018-02-22 → 2018-04-05
    Dangerous wreck in 53-57.6N 000-01.0W
  5. HYDROLANT 590/18 · Surveys2018-02-18 → 2018-02-20
    Survey operations in progress until further notice by M/V geosurveyor XI in vicinity 51-20N 001-55E
  6. HYDROLANT 551/18 · Nav aids2018-02-15 → 2018-03-06
    Fog signal at platform 49/9-QC, 53-41.7N 002-37.3E unreliable
  7. HYDROLANT 533/18 · Nav aids2018-02-13 → 2018-02-14
    Cgoc aberdeen mf dsc service at greg ness 57-08N 002-03W unreliable
  8. HYDROLANT 525/18 · Nav aids2018-02-13 → 2018-02-26
    Platform 44/23, 54-20.0N 002-28.7E unlit
  9. HYDROLANT 521/18 · Nav aids2018-02-13 → 2018-03-27
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  10. HYDROLANT 520/18 · Other2018-02-13 → 2018-03-27
    Unexploded ordnance in: a. 52-10.9N 002-06.9E
  11. HYDROLANT 508/18 · Other2018-02-12 → 2018-02-13
    Unexploded ordnance in 52-11.5N 002-12.9E
  12. HYDROLANT 482/18 · Debris2018-02-10 → 2018-02-13
    Buoy adrift in 56-23.09N 002-15.66E at 092247Z feb
  13. HYDROLANT 427/18 · Other2018-02-06 → 2018-02-07
    Unexploded ordnance in: a. 52-18.1N 002-28.6E
  14. HYDROLANT 405/18 · Cable ops2018-02-04 → 2018-02-09
    Underwater operations in progress until further notice by cableship pierre de fermat with submersible in…
  15. HYDROLANT 404/18 · Nav aids2018-02-04 → 2018-02-09
    Dgps station at sumburgh head light 59-51.2N 001-16.5W off air
  16. HYDROLANT 396/18 · Nav aids2018-02-03 → 2018-03-17
    Fog signal at platform 44/17-MH, 54-26.1N 002-18.0E inoperative
  17. HYDROLANT 392/18 · Other2018-02-03 → 2018-03-17
    Unexploded ordnance in 51-19.31N 001-56.12E
  18. HYDROLANT 391/18 · Nav aids2018-02-03 → 2018-02-03
    Flamborough head light 54-07N 000-05W unreliable
  19. HYDROLANT 385/18 · Wrecks2018-02-02 → 2018-03-16
    Fog signals at sheringham shoal wind farm 53-08N 001-10E unreliable
  20. HYDROLANT 321/18 · Nav aids2018-01-29 → 2018-02-01
    Bell rock light 56-26.1N 002-23.2W unlit and RACON inoperative

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