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 2039/23 · Cable ops2023-09-11 → 2023-09-13
    Pipeline operations in progress until further notice by M/V aht elisa towing 1300 meter long pipeline along…
  2. HYDROLANT 2011/23 · Nav aids2023-09-07 → 2023-10-20
    Sandettie n buoy 51-18.40N 002-04.70E missing
  3. HYDROLANT 1996/23 · Nav aids2023-09-05 → 2023-09-05
    All navigational aids at platform katy, 54-24.00N 002-40.00E inoperative
  4. HYDROLANT 1984/23 · Surveys2023-09-04 → 2023-09-27
    Survey operations in progress until further notice by M/V ramform atlas towing 14 6000 meter long cables in…
  5. HYDROLANT 1933/23 · Nav aids2023-08-29 → 2023-08-29
    Sunk inner lightfloat 51-51.03N 001-34.89E unlit
  6. HYDROLANT 1909/23 · Nav aids2023-08-26 → 2023-08-26
    Firths voe light 60-27.20N 001-10.60W unreliable
  7. HYDROLANT 1871/23 · Nav aids2023-08-21 → 2023-08-24
    RACON at saint abb's head light 55-55.00N 002-08.30W inoperative
  8. HYDROLANT 1860/23 · Nav aids2023-08-21 → 2023-08-21
    Lother rock light 58-43.80N 002-58.70W unlit
  9. HYDROLANT 1852/23 · Nav aids2023-08-19 → 2023-08-25
    RACON at dudgeon buoy 53-16.60N 001-16.90E inoperative
  10. HYDROLANT 1841/23 · Surveys2023-08-18 → 2023-09-05
    Survey operations in progress until further notice by M/V amazon conqueror towing 6500 meter long cables in…
  11. HYDROLANT 1836/23 · Exercises2023-08-18 → 2023-08-31
    Hazardous operations 1000Z to 1100Z and 1500Z to 1600Z daily 22 thru 24, 30 and 31 and 251000Z to 251100Z…
  12. HYDROLANT 1820/23 · Surveys2023-08-16 → 2023-09-08
    Survey operations in progress until further notice by M/V pxgeo 2 towing ten 4500 meter long cables in area…
  13. HYDROLANT 1794/23 · Nav aids2023-08-13 → 2023-08-15
    Caravel platform 53-25.60N 002-53.80E unlit
  14. HYDROLANT 1771/23 · Nav aids2023-08-10 → 2023-08-11
    Cgoc aberdeen VHF dsc and r/t services at fifeness site 56-16.70N 002-35.30W off air
  15. HYDROLANT 1760/23 · Other2023-08-09 → 2023-08-12
    Cgoc aberdeen mf dsc and r/t services at gregness site 57-07.65N 002-03.22W unreliable
  16. HYDROLANT 1726/23 · Nav aids2023-08-04 → 2023-08-06
    All navigational aids at platform 49/23-D 53-18.10N 002-29.90E inoperative
  17. HYDROLANT 1685/23 · Nav aids2023-07-27 → 2023-09-07
    Sandettie n buoy 51-18.40N 002-04.70E missing
  18. HYDROLANT 1616/23 · Surveys2023-07-18 → 2023-08-18
    Survey operations in progress until further notice by M/V amazon conqueror towing 6500 meter long cables in…
  19. HYDROLANT 1615/23 · Surveys2023-07-18 → 2023-07-18
    Survey operations in progress until further notice by M/V amazon conqueror towing 6500 meter long cables in…
  20. HYDROLANT 1554/23 · Nav aids2023-07-10 → 2023-07-11
    Foxtrot 3 lightship 51-24.10N 002-00.40E 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.