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 1165/18 · Other2018-04-11 → 2018-05-18
    Unexploded ordnance in 53-53.05N 001-39.55E
  2. HYDROLANT 1135/18 · Other2018-04-07 → 2018-04-13
    Unexploded ordnance in 51-59.8N 001-26.0E
  3. HYDROLANT 1110/18 · Wrecks2018-04-05 → 2019-01-04
    Dangerous wreck in 53-57.6N 000-01.0W
  4. HYDROLANT 1103/18 · Nav aids2018-04-04 → 2018-04-06
    Stirling dgps station 56-04N 004-04W unreliable
  5. HYDROLANT 1094/18 · Nav aids2018-04-03 → 2018-04-03
    Stirling dgps station 56-04N 004-04W unreliable
  6. HYDROLANT 1089/18 · Nav aids2018-04-02 → 2018-04-04
    Dgps station at sumburgh head light 59-51.2N 001-16.5W off air 030800Z apr until further notice
  7. HYDROLANT 1086/18 · Nav aids2018-04-02 → 2018-04-19
    All navigational aids at platform 44/23A kilmar, 54-17.4N 001-20.2E inoperative
  8. HYDROLANT 1058/18 · Nav aids2018-03-30 → 2018-04-01
    All navigational aids at platform 48/6-C, 53-45.2N 001-04.9E inoperative
  9. HYDROLANT 1049/18 · Wrecks2018-03-29 → 2018-05-10
    Dangerous wreck in 57-41.99N 002-57.36W
  10. HYDROLANT 1026/18 · Nav aids2018-03-27 → 2018-05-08
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  11. HYDROLANT 1025/18 · Other2018-03-27 → 2018-05-08
    Unexploded ordnance in: a. 52-10.9N 002-06.9E b. 52-11.5N 002-12.9E
  12. HYDROLANT 1010/18 · Nav aids2018-03-25 → 2018-04-05
    All navigation aids at platform 49/21-PRD, 53-14.9N 002-01.5E inoperative
  13. HYDROLANT 1000/18 · Nav aids2018-03-24 → 2018-03-25
    Tarbat ness light 57-51.9N 003-46.6W unreliable 241200Z to 250600Z mar
  14. HYDROLANT 961/18 · Nav aids2018-03-21 → 2018-03-22
    Scurdie ness light 56-42.1N 002-26.3W unreliable 211200Z to 220001Z mar
  15. HYDROLANT 943/18 · Nav aids2018-03-19 → 2018-03-21
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W unreliable
  16. HYDROLANT 936/18 · Nav aids2018-03-19 → 2018-03-19
    Dgps station at north foreland light 51-22.5N 001-26.7E off air 190800Z to 191600Z mar
  17. HYDROLANT 932/18 · Nav aids2018-03-18 → 2018-03-19
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W off air
  18. HYDROLANT 926/18 · Nav aids2018-03-17 → 2018-03-20
    Fog signal at platform 44/17-MH, 54-26.1N 002-18.0E inoperative
  19. HYDROLANT 925/18 · Other2018-03-17 → 2018-04-28
    Unexploded ordnance in 51-19.31N 001-56.12E
  20. HYDROLANT 918/18 · Wrecks2018-03-16 → 2018-04-27
    Fog signals at sheringham shoal wind farm 53-08N 001-10E 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.