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 3826/18 · Nav aids2018-12-08 → 2018-12-11
    Platform 53-00.3N 002-12.9E unlit
  2. HYDROLANT 3799/18 · Other2018-12-05 → 2018-12-08
    Fishing gear, marked by buoys, abandoned in 55-07.29N 000-57.55W at 051714Z
  3. HYDROLANT 3783/18 · Nav aids2018-12-04 → 2019-01-08
    Dudgeon windfarm turbines unlit in: a. 53-17.00N 001-19.28E
  4. HYDROLANT 3739/18 · Nav aids2018-11-30 → 2018-12-20
    Platform 11/30-C 58-05.7N 003-09.1W unlit
  5. HYDROLANT 3722/18 · Nav aids2018-11-29 → 2018-12-27
    Cgoc aberdeen mf dsc service at greg ness 57-07.6N 002-03.2W off air
  6. HYDROLANT 3721/18 · Nav aids2018-11-29 → 2019-01-11
    Fog signal and lights at anglia gas platform 53-22.1N 001-39.2E inoperative
  7. HYDROLANT 3714/18 · Wrecks2018-11-29 → 2019-01-09
    Foul ground reported in 57-11.9N 001-58.2W
  8. HYDROLANT 3712/18 · Nav aids2018-11-29 → 2018-11-29
    Cgoc aberdeen mf dsc service at greg ness 57-07.6N 002-03.2W off air
  9. HYDROLANT 3690/18 · Nav aids2018-11-27 → 2018-12-03
    All navigational aids at platform 49/18-A 53-21.8N 002-34.1E inoperative
  10. HYDROLANT 3679/18 · Cable ops2018-11-26 → 2018-12-10
    Cable operations in progress until further notice by cableship living stone and M/V lange wrapper in area…
  11. HYDROLANT 3671/18 · Cable ops2018-11-26 → 2018-12-07
    Underwater operations in progress until further notice by cableship maersk connector in vicinity: a.…
  12. HYDROLANT 3623/18 · Other2018-11-21 → 2019-01-02
    Unexploded ordnance in: a. 52-18.44N 002-15.89E
  13. HYDROLANT 3620/18 · Wrecks2018-11-21 → 2018-11-28
    Foul ground reported in 57-11.5N 002-01.1W
  14. HYDROLANT 3604/18 · Containers2018-11-20 → 2018-11-23
    Three containers adrift in vicinity 53-24.9N 000-43.3E
  15. HYDROLANT 3565/18 · Nav aids2018-11-16 → 2018-12-28
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  16. HYDROLANT 3548/18 · Nav aids2018-11-15 → 2018-12-06
    Platform pickerill a, 53-32.95N 001-04.56E, unlit and all navigational aids inoperative
  17. HYDROLANT 3523/18 · Wrecks2018-11-13 → 2018-12-25
    Obstruction, marked by orange buoy, in 56-16.45N 002-15.17W
  18. HYDROLANT 3499/18 · Nav aids2018-11-10 → 2018-12-22
    Platform pickerill b, 53-31.5N 001-09.6E, unlit and all navigational aids inoperative
  19. HYDROLANT 3475/18 · Surveys2018-11-09 → 2018-12-02
    Survey operations in progress until further notice by M/V geo caribbean towing ten 8000 meter long cables in…
  20. HYDROLANT 3459/18 · Nav aids2018-11-07 → 2018-12-18
    Swilkie point light 58-41.8N 003-07.0W range temporarily reduced to 12 miles

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