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 89/24 · Nav aids2024-01-12 → 2024-02-23
    Sandettie n buoy 51-18.40N 002-04.70E missing
  2. HYDROLANT 83/24 · Nav aids2024-01-11 → 2024-01-14
    Cgoc shetland mf r/t and dsc services at lerwick site in 60-08.90N 001-08.40W off air
  3. HYDROLANT 58/24 · Nav aids2024-01-08 → 2024-02-19
    Humber met mast 53-10.70N 002-59.10E unlit and navaids inoperative
  4. HYDROLANT 24/24 · Nav aids2024-01-04 → 2024-02-15
    Dudgeon RACON 53-16.60N 001-16.90E inoperative
  5. HYDROLANT 2957/23 · Nav aids2023-12-28 → 2023-12-28
    Firths voe light 60-27.20N 001-10.60W unreliable
  6. HYDROLANT 2843/23 · Nav aids2023-12-08 → 2024-01-18
    NAVTEX station cullercoats (g) 55-04.48N 001-27.79W unreliable
  7. HYDROLANT 2777/23 · Nav aids2023-12-01 → 2024-01-12
    Sandettie n buoy 51-18.40N 002-04.70E missing
  8. HYDROLANT 2683/23 · Nav aids2023-11-21 → 2023-11-26
    Tarf light 58-44.30N 003-04.20W unlit
  9. HYDROLANT 2679/23 · Nav aids2023-11-21 → 2023-11-24
    The tarf light 58-44.3N 003-04.2W unlit
  10. HYDROLANT 2676/23 · Nav aids2023-11-21 → 2023-11-21
    Tarf light 58-44.30N 003-04.20W unreliable
  11. HYDROLANT 2601/23 · Nav aids2023-11-14 → 2023-11-16
    NAVTEX station cullercoats (g), 55-04.00N 001-28.00W unreliable 150900Z nov until further notice
  12. HYDROLANT 2493/23 · Nav aids2023-11-01 → 2023-11-29
    Cgoc humber mf r/t services at cullercoats site 55-04.4N 001-27.8W off air
  13. HYDROLANT 2424/23 · Nav aids2023-10-23 → 2023-10-25
    Cgoc shetland mf dsc and r/t services at lerwick site 60-08.90N 001-08.40W off air
  14. HYDROLANT 2389/23 · Nav aids2023-10-20 → 2023-10-22
    RACON at inter bank buoy 51-16.50N 001-52.20E inoperative
  15. HYDROLANT 2382/23 · Nav aids2023-10-20 → 2023-12-01
    Sandettie n buoy 51-18.40N 002-04.70E missing
  16. HYDROLANT 2380/23 · Nav aids2023-10-19 → 2023-10-20
    NAVTEX station cullercoats (g) 55-04.00N 001-28.00W off air
  17. HYDROLANT 2319/23 · Other2023-10-13 → 2023-11-23
    Sumburgh head light 59-51.20N 001-16.50W ranged reduced to 12 miles
  18. HYDROLANT 2187/23 · Surveys2023-09-27 → 2023-10-08
    Survey operations in progress until further notice by M/V ramform atlas towing 14 6000 meter long cables in…
  19. HYDROLANT 2087/23 · Surveys2023-09-17 → 2023-11-08
    Survey operations in progress until further notice by M/V kommandor towing 1300 meter long cables in area…
  20. HYDROLANT 2047/23 · Nav aids2023-09-11 → 2023-09-18
    Cgoc shetland mf r/t and dsc services at lerwick site 60-08.92N 001-08.43W off air

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