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 59/19 · Nav aids2019-01-07 → 2019-01-07
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W off air
  2. HYDROLANT 57/19 · Cable ops2019-01-06 → 2019-01-07
    Cable operations in progress until further notice by cableship maersk connector in vicinity of trackline…
  3. HYDROLANT 30/19 · Cable ops2019-01-04 → 2019-02-16
    Cable operations in progress until further notice by M/V hercules in area bound by 53-31.9N 000-02.2E,…
  4. HYDROLANT 28/19 · Other2019-01-04 → 2019-02-04
    All navigational aids inoperative at platforms: a. 11/30-C, 58-05.7N 003-09.1W
  5. HYDROLANT 15/19 · Other2019-01-02 → 2019-02-13
    Unexploded ordnance in: a. 52-18.44N 002-15.89E
  6. HYDROLANT 4056/18 · Nav aids2018-12-28 → 2019-02-08
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  7. HYDROLANT 4017/18 · Wrecks2018-12-25 → 2019-02-19
    Obstruction, marked by orange buoy, in 56-16.45N 002-15.17W
  8. HYDROLANT 3998/18 · Nav aids2018-12-22 → 2018-12-23
    Platform pickerill b, 53-31.5N 001-09.6E, unlit and all navigational aids inoperative
  9. HYDROLANT 3988/18 · Nav aids2018-12-21 → 2019-01-04
    All navaids at platform 11/30-C in 58-05.7N 003-09.1W inoperative
  10. HYDROLANT 3987/18 · Nav aids2018-12-21 → 2018-12-22
    All navaids at platform ensign in 53-35.4N 001-46.4E inoperative
  11. HYDROLANT 3975/18 · Nav aids2018-12-20 → 2018-12-26
    All navigational aids at platform 49/19 bg, 53-24.1N 002-39.3E unlit
  12. HYDROLANT 3973/18 · Nav aids2018-12-20 → 2018-12-21
    Fog signal at platform 11/30-C, 58-05.7N 003-09.1W inoperative
  13. HYDROLANT 3972/18 · Other2018-12-20 → 2019-03-15
    Navigation prohibited in area within one mile of: a. 54-11.31N 002-12.56E
  14. HYDROLANT 3960/18 · Nav aids2018-12-19 → 2018-12-20
    All navigational aids at platform 15/17-A, 58-25N 000-20E inoperative
  15. HYDROLANT 3949/18 · Nav aids2018-12-19 → 2018-12-20
    Flamborough head light 54-07N 000-05W unreliable
  16. HYDROLANT 3938/18 · Other2018-12-17 → 2019-01-27
    Unexploded ordnance in 52-18.32N 002-15.07E
  17. HYDROLANT 3905/18 · Nav aids2018-12-14 → 2019-01-25
    All navigational aids at platform 48/12A 53-32.8N 001-21.6E inoperative
  18. HYDROLANT 3873/18 · Other2018-12-12 → 2018-12-15
    Numerous large bundles of wood adrift in vicinity 58-11.3N 002-28.3E at 121513Z dec
  19. HYDROLANT 3870/18 · Other2018-12-12 → 2019-03-04
    Unexploded ordnance in 52-19.94N 002-46.49E
  20. HYDROLANT 3840/18 · Cable ops2018-12-10 → 2019-01-04
    Cable operations in progress until further notice by M/V lange wrapper and M/V hercules in area bound by…

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