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 1580/20 · Nav aids2020-05-08 → 2020-06-19
    Light at mast 53-10.7N 002-59.1E unreliable
  2. HYDROLANT 1485/20 · Other2020-04-30 → 2020-06-11
    Anchors, 1500 meter cable, marked by buoys in: a. 56-38.6N 002-20.2W
  3. HYDROLANT 1457/20 · Nav aids2020-04-28 → 2020-05-13
    All aids to navigation at caravel platform, 53-25.7N 002-53.9E unreliable
  4. HYDROLANT 1437/20 · Surveys2020-04-27 → 2020-06-17
    Survey operations in progress until further notice by M/V sw amundsen towing nine 3500 meter long cables in…
  5. HYDROLANT 1357/20 · Surveys2020-04-17 → 2020-04-19
    Survey operations in progress until further notice by M/V fugro discovery in vicinity of trackline joining…
  6. HYDROLANT 1320/20 · Nav aids2020-04-14 → 2020-04-15
    Cgoc aberdeen mf r/t and dsc services at greg ness site 57-07.6N 002-03.2W unreliable
  7. HYDROLANT 1313/20 · Nav aids2020-04-13 → 2020-05-03
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  8. HYDROLANT 1235/20 · Nav aids2020-04-06 → 2020-04-08
    All navigational aids at platform 52/5-A 53-00.0N 001-50.8E unlit
  9. HYDROLANT 1157/20 · Nav aids2020-03-30 → 2020-03-31
    Cgoc aberdeen mf r/t services at greg ness site 57-07.6N 002-03.2W off air
  10. HYDROLANT 1142/20 · Nav aids2020-03-29 → 2020-03-30
    Foxtrot 3 lightship 51-23-48N 002-00-36E unreliable
  11. HYDROLANT 1135/20 · Nav aids2020-03-28 → 2020-03-30
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W off air
  12. HYDROLANT 1094/20 · Nav aids2020-03-25 → 2020-04-01
    All navigational aids at kilmar platform 54-17.4N 001-20.2E inoperative
  13. HYDROLANT 1037/20 · Surveys2020-03-19 → 2020-04-07
    Survey operations in progress until further notice by M/V fugro discovery in vicinity of trackline joining…
  14. HYDROLANT 1035/20 · Nav aids2020-03-19 → 2020-03-20
    Smiths knoll south cardinal buoy 52-43.5N 002-18.0E missing
  15. HYDROLANT 1018/20 · Nav aids2020-03-17 → 2020-04-28
    All aids to navigation at caravel platform, 53-25.7N 002-53.9E unreliable
  16. HYDROLANT 948/20 · Nav aids2020-03-13 → 2020-03-13
    Dgps station at sumburgh head light 59-51.2N 001-16.5W off air 131100Z to 131600Z mar
  17. HYDROLANT 947/20 · Nav aids2020-03-13 → 2020-03-14
    Foxtrot 3 lightship 51-23-48N 002-00-36E unreliable
  18. HYDROLANT 939/20 · Nav aids2020-03-12 → 2020-07-31
    All navigational aids at wenlock platform, 53-35.3N 002-17.7E inoperative
  19. HYDROLANT 932/20 · Derelicts2020-03-11 → 2020-03-14
    Derelict six meter vessel, red and blue hull, adrift in 53-01.3N 001-09.6E at 111130Z mar
  20. HYDROLANT 893/20 · Containers2020-03-08 → 2020-03-11
    Container adrift in 58-34.6N 004-51.2E at 081213Z mar

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