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 3070/17 · Surveys2017-09-27 → 2017-09-30
    Underwater operations in progress until further notice by M/V rambiz 300 in 53-05.0N 002-32.7E
  2. HYDROLANT 3033/17 · Nav aids2017-09-25 → 2017-09-26
    Platform 14/29A goldeneye, 58-00.1N 000-22.9W lights unreliable
  3. HYDROLANT 3014/17 · Surveys2017-09-24 → 2017-09-27
    Underwater operations in progress until further notice by M/V havila phoenix along trackline joining…
  4. HYDROLANT 3003/17 · Surveys2017-09-24 → 2017-10-30
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 6000 meter long cables…
  5. HYDROLANT 2967/17 · Nav aids2017-09-22 → 2017-11-17
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  6. HYDROLANT 2919/17 · Other2017-09-19 → 2017-09-20
    Unexploded ordnance in 51-47.63N 001-14.17E
  7. HYDROLANT 2918/17 · Cable ops2017-09-19 → 2017-09-24
    Cable operations in progress until further notice along trackline between 51-18.4N 001-28.3E and 51-19.4N…
  8. HYDROLANT 2887/17 · Surveys2017-09-17 → 2017-09-19
    Survey operations in progress until further notice by M/V deep helder in vicinity of trackline between…
  9. HYDROLANT 2832/17 · Other2017-09-13 → 2017-10-25
    Unexploded ordnance in 53-53.05N 001-39.55E
  10. HYDROLANT 2800/17 · Nav aids2017-09-11 → 2017-09-20
    All navigational aids at platform 44/23 a-cm, 54-12.2N 002-27.1E inoperative
  11. HYDROLANT 2781/17 · Surveys2017-09-09 → 2017-09-20
    Survey operations in progress until further notice by M/V wg amudsen towing eight 5000 meter long cables in…
  12. HYDROLANT 2771/17 · Cable ops2017-09-08 → 2017-09-15
    Underwater operations in progress until further notice by cableship pierre de fermat with submersible in…
  13. HYDROLANT 2738/17 · Nav aids2017-09-07 → 2017-09-11
    All navigational aids at munro gas platform 54-26.1N 002-18.0E inoperative
  14. HYDROLANT 2720/17 · Surveys2017-09-05 → 2017-09-10
    Underwater operations in progress until further notice by M/V rambiz 3000 in 53-05.0N 002-32.7E
  15. HYDROLANT 2717/17 · Nav aids2017-09-05 → 2017-09-18
    All navigational aids at platform 49/16, 53-23.2N 002-08.9E inoperative
  16. HYDROLANT 2692/17 · Nav aids2017-09-03 → 2017-09-15
    All navigational aids at platform 48/17C, 53-21.2N 001-18.3E inoperative
  17. HYDROLANT 2686/17 · Cable ops2017-09-02 → 2017-09-06
    Underwater operations in progress until further notice by cableship wave sentinel in vicinity of trackline…
  18. HYDROLANT 2682/17 · Nav aids2017-09-01 → 2017-09-04
    All navigational aids at shamrock platform, 53-28.2N 002-55.3E inoperative
  19. HYDROLANT 2676/17 · Cable ops2017-09-01 → 2017-09-17
    Survey operations in progress until further notice by M/V deep helder and cableship maersk connector in…
  20. HYDROLANT 2672/17 · Other2017-08-31 → 2017-09-03
    Unexploded ordnance in 53-30.80N 000-15.25E

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