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 2730/22 · Surveys2022-10-27 → 2022-11-11
    Survey operations in progress until further notice by M/V kommandor towing 1200 meter long cable in area…
  2. HYDROLANT 2718/22 · Cable ops2022-10-26 → 2022-10-31
    Cable operations in progress until further notice by cableship cable vigilance in vicinity 59-56.30N…
  3. HYDROLANT 2690/22 · Surveys2022-10-22 → 2022-10-23
    Survey operations in progress until further notice by M/V fugro venturer towing 1300 meter long cable in…
  4. HYDROLANT 2655/22 · Surveys2022-10-19 → 2022-10-21
    Survey operations in progress until further notice by M/V fugro venturer towing 1300 meter long cable in…
  5. HYDROLANT 2626/22 · Nav aids2022-10-15 → 2022-10-21
    RACON at lother rock beacon 58-43.80N 002-58.70W inoperative
  6. HYDROLANT 2598/22 · Nav aids2022-10-12 → 2022-10-13
    Dsc services at noss head site 58-28.70N 003-03.10W off air
  7. HYDROLANT 2582/22 · Nav aids2022-10-11 → 2022-10-27
    Cavendish platform 54-28.70N 001-44.40E
  8. HYDROLANT 2544/22 · Nav aids2022-10-07 → 2022-10-08
    Bell rock light 56-26.10N 002-23.20W unlit
  9. HYDROLANT 2518/22 · Nav aids2022-10-04 → 2022-10-05
    NAVTEX station cullercoats (g) 55-02.00N 001-26.00W off air 050730Z to 051600Z oct
  10. HYDROLANT 2497/22 · Nav aids2022-10-01 → 2022-10-02
    Cgoc shetland mf r/t service at lerwick site 60-08.92N 001-08.43W off air
  11. HYDROLANT 2454/22 · Nav aids2022-09-27 → 2022-09-29
    Whitby high light at 54-28.7N 000-34.1W reported unreliable
  12. HYDROLANT 2442/22 · Nav aids2022-09-26 → 2023-07-14
    Flamborough head light at 54-07.00N 000-05.00W range reduced to 18 miles
  13. HYDROLANT 2430/22 · Nav aids2022-09-26 → 2022-10-07
    Platform 29/5B 56-58.00N 001-52.00E lights unreliable
  14. HYDROLANT 2377/22 · Other2022-09-20 → 2022-11-01
    Unexploded ordnance in: a. 54-52.04N 001-42.22E
  15. HYDROLANT 2370/22 · Nav aids2022-09-19 → 2022-09-21
    NAVAREA station cullercoats (g), in 55-04.00N 001-28.00W off air
  16. HYDROLANT 2352/22 · Nav aids2022-09-16 → 2022-10-28
    Mrcc aberdeen mf r/t and dsc services at gregness site 57-07.64N 002-03.23W off air
  17. HYDROLANT 2346/22 · Wrecks2022-09-16 → 2023-07-14
    Dangerous wreck, least depth 15.6 meters, in 54-40.10N 002-26.80E
  18. HYDROLANT 2306/22 · Nav aids2022-09-13 → 2022-09-19
    NAVTEX station cullercoats (g) 55-04.48N 001-27.79W off air until 200100Z sep
  19. HYDROLANT 2245/22 · Nav aids2022-09-07 → 2022-09-13
    Mdw buoy 51-19.20N 001-59.30E missing
  20. HYDROLANT 2242/22 · Cable ops2022-09-07 → 2022-10-05
    Underwater operations in progress until further notice by cableship responder along trackline joining…

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