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 914/18 · Nav aids2018-03-16 → 2018-03-27
    Meteorological mast 52-40.1N 001-47.1E light unlit
  2. HYDROLANT 889/18 · Nav aids2018-03-13 → 2018-03-14
    Holm of skaw light 60-49.9N 000-46.3W unlit
  3. HYDROLANT 888/18 · Nav aids2018-03-13 → 2018-03-20
    All navigational aids at platform 49/27-G, 53-02.2N 002-22.8E inoperative
  4. HYDROLANT 870/18 · Nav aids2018-03-12 → 2018-03-12
    Cgoc aberdeen mf dsc at cruden bay 57-25N 001-52W unreliable
  5. HYDROLANT 864/18 · Surveys2018-03-11 → 2018-03-16
    Underwater operations in progress until further notice by M/V normand reach in 53-05.0N 002-32.7E
  6. HYDROLANT 858/18 · Nav aids2018-03-10 → 2018-04-20
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  7. HYDROLANT 813/18 · Nav aids2018-03-07 → 2018-03-09
    All navigational aids at platform 49/23-E 53-11.9N 002-29.1E inoperative
  8. HYDROLANT 801/18 · Other2018-03-06 → 2018-03-09
    Numerous wooden planks adrift in area bound by 55-59.0N 000-01.1W, 55-31.8N 000-30.0E, 55-09.0N 000-31.7W,…
  9. HYDROLANT 798/18 · Other2018-03-06 → 2018-03-12
    All navigational aids at platforms inoperative: a. 49/9-QC, 53-41.7N 002-37.3E
  10. HYDROLANT 789/18 · Nav aids2018-03-06 → 2018-03-08
    All navigational aids at platform trent 43/24, 54-18.0N 001-39.6E inoperative
  11. HYDROLANT 784/18 · Other2018-03-05 → 2018-03-06
    Numerous wooden planks adrift in area within eight miles of 55-18.7N 000-02.5E at 051223Z mar
  12. HYDROLANT 776/18 · Other2018-03-04 → 2018-03-10
    All navigational aids at platforms inoperative: a. 49/26-F, 53-06.5N 002-04.0E
  13. HYDROLANT 770/18 · Nav aids2018-03-04 → 2018-03-06
    All navigational aids at platform 48/6-B, 53-43.1N 001-07.1E inoperative
  14. HYDROLANT 769/18 · Nav aids2018-03-04 → 2018-03-06
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W off air
  15. HYDROLANT 766/18 · Nav aids2018-03-03 → 2018-03-04
    NAVTEX station cullercoats (g) 55-04.5N 001-27.8W unreliable
  16. HYDROLANT 750/18 · Other2018-03-02 → 2018-03-07
    All navigational aids at platforms inoperative: a. 49/18-BP, 53-23.5N 002-31.5E
  17. HYDROLANT 715/18 · Nav aids2018-03-01 → 2018-03-07
    Stirling dgps station 56-04N 004-04W unreliable
  18. HYDROLANT 714/18 · Nav aids2018-03-01 → 2018-03-28
    All navigational aids at kilmar gas platform 54-17.4N 001-20.2E inoperative
  19. HYDROLANT 707/18 · Nav aids2018-02-28 → 2018-03-01
    Sumburgh head light 59-51.2N 001-16.5W unreliable
  20. HYDROLANT 706/18 · Nav aids2018-02-28 → 2018-03-27
    All navigational aids at platform 48/29-B, 53-03.2N 001-41.1E inoperative

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