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 3762/17 · Nav aids2017-11-22 → 2018-01-05
    Fog signal at platform 9/13-SPM3, 59-32.0N 001-33.5E inoperative
  2. HYDROLANT 3750/17 · Nav aids2017-11-21 → 2018-01-02
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  3. HYDROLANT 3733/17 · Nav aids2017-11-20 → 2017-12-04
    All navigational aids at platform 48/17C, 53-21.2N 001-18.2E inoperative
  4. HYDROLANT 3724/17 · Surveys2017-11-18 → 2017-11-22
    Underwater operations in progress until further notice by M/V deep helder in vicinity of trackline between…
  5. HYDROLANT 3722/17 · Other2017-11-18 → 2017-11-21
    Fishing gear, marked by buoy, abandoned in 57-13.4N 001-51.2W
  6. HYDROLANT 3714/17 · Wrecks2017-11-17 → 2017-11-24
    Obstruction in 52-25.8N 001-45.8E
  7. HYDROLANT 3703/17 · Cable ops2017-11-17 → 2017-11-23
    Underwater operations in progress until further notice by cableship wave sentinel in vicinity 52-56.6N…
  8. HYDROLANT 3668/17 · Cable ops2017-11-14 → 2017-11-17
    Underwater operations in progress until further notice by cableship wave sentinel in vicinity 53-12.2N…
  9. HYDROLANT 3656/17 · Other2017-11-13 → 2017-11-16
    Unexploded ordnance, marked by buoy, in 53-17.0N 002-31.9E
  10. HYDROLANT 3651/17 · Other2017-11-12 → 2017-11-15
    Unexploded ordnance in area within 300 meters of 56-06.4N 002-32.4W
  11. HYDROLANT 3649/17 · Other2017-11-11 → 2017-12-23
    Unexploded ordnance in 51-19.31N 001-56.12E
  12. HYDROLANT 3635/17 · Wrecks2017-11-10 → 2017-12-22
    Fog signals at sheringham shoal wind farm 53-08N 001-10E unreliable
  13. HYDROLANT 3624/17 · Surveys2017-11-09 → 2017-11-17
    Underwater operations in progress until further notice by M/V havila phoenix in vicinity of trackline…
  14. HYDROLANT 3594/17 · Nav aids2017-11-06 → 2017-12-05
    Platform 49/16, 53-23.2N 002-08.9E unlit
  15. HYDROLANT 3533/17 · Nav aids2017-10-31 → 2017-11-01
    Cgoc aberdeen mf dsc at cruden bay 57-25N 001-52W unreliable
  16. HYDROLANT 3498/17 · Containers2017-10-29 → 2017-11-01
    Container adrift in 58-03.4N 004-13.8E at 290158Z oct
  17. HYDROLANT 3455/17 · Other2017-10-25 → 2017-12-07
    Unexploded ordnance in 53-53.05N 001-39.55E
  18. HYDROLANT 3410/17 · Nav aids2017-10-22 → 2017-10-24
    All navigational aids at platform 49/16, 53-23.2N 002-09.0E inoperative
  19. HYDROLANT 3386/17 · Nav aids2017-10-20 → 2017-10-23
    RACON at inter bank buoy 51-16.5N 001-52.2E inoperative
  20. HYDROLANT 3354/17 · Nav aids2017-10-19 → 2017-10-19
    Sandettie lightship 51-09.4N 001-47.1E 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.