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 857/20 · Nav aids2020-03-05 → 2020-03-16
    Platform 44/17-MH 54-26.1N 002-18.0E unlit
  2. HYDROLANT 848/20 · Nav aids2020-03-04 → 2020-03-07
    Duncansby head light 58-38-38N 003-01-30W unreliable until 06 mar
  3. HYDROLANT 815/20 · Nav aids2020-03-03 → 2020-04-13
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  4. HYDROLANT 775/20 · Surveys2020-03-01 → 2020-03-19
    Survey operations in progress until further notice by M/V fugro gauss in vicinity of trackline joining…
  5. HYDROLANT 767/20 · Nav aids2020-02-29 → 2020-03-01
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W off air
  6. HYDROLANT 738/20 · Surveys2020-02-28 → 2020-03-01
    Survey operations in progress until further notice by M/V furgo gauss in vicinity of trackline joining…
  7. HYDROLANT 695/20 · Nav aids2020-02-25 → 2020-02-25
    Dgps station at flamborough head light 54-07N 000-05W off air 250900Z to 251700Z feb
  8. HYDROLANT 687/20 · Nav aids2020-02-24 → 2020-02-28
    Platform 44/26A 54-03.6N 002-04.7E unlit, all aids to navigation inoperative
  9. HYDROLANT 624/20 · Derelicts2020-02-19 → 2020-02-22
    Derelict nine meter S/V, white and blue hull, adrift in vicinity 56-50N 001-38W at 192100Z feb
  10. HYDROLANT 605/20 · Nav aids2020-02-18 → 2020-04-17
    Ensign platform 53-34.4N 001-46.4E all aids to navigation unreliable
  11. HYDROLANT 584/20 · Nav aids2020-02-17 → 2020-02-19
    Mpc buoy 51-06.1N 001-38.3E off station RACON and AIS inoperative
  12. HYDROLANT 553/20 · Nav aids2020-02-15 → 2020-02-17
    Mpc buoy 51-06.1N 001-38.3E off station and RACON inoperative
  13. HYDROLANT 512/20 · Nav aids2020-02-12 → 2020-02-14
    CS4 light buoy 51-08.7N 001-34.0E off station
  14. HYDROLANT 499/20 · Nav aids2020-02-11 → 2020-02-14
    South shipwash buoy 51-52.7N 001-34.0E unlit
  15. HYDROLANT 471/20 · Nav aids2020-02-10 → 2020-02-14
    Foxtrot 3 lightship 51-23.8N 002-00.6E unreliable
  16. HYDROLANT 458/20 · Nav aids2020-02-09 → 2020-03-02
    East goodwin lightfloat 51-13.0N 001-36.3E RACON inoperative and off station
  17. HYDROLANT 455/20 · Nav aids2020-02-09 → 2020-02-09
    East goodwin lightfloat 51-13.0N 001-36.3E unreliable
  18. HYDROLANT 445/20 · Wrecks2020-02-08 → 2020-02-13
    Obstruction reported in 56-14.66N 002-18.45W
  19. HYDROLANT 443/20 · Nav aids2020-02-08 → 2020-02-10
    All navigational lights at leman gasfield charlie platform 53-01.6N 002-15.4E inoperative
  20. HYDROLANT 436/20 · Nav aids2020-02-07 → 2020-02-08
    Rova head light 60-11.4N 001-08.5W unlit

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