North Sea

IHO sea area 4 · -4° to 12° E, 51° to 61° N

in force
1
last 12 months
6
since 1997
4,731
categories
11

In force now · 1

  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.

Longest in force

  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.

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 aids2,50253%
Other66914%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,730 cancelled

  1. HYDROLANT 1973/05 · Surveys2005-10-30 → 2005-11-01
    Underwater operations in progress until further notice by M/V normand progress along trackline between…
  2. HYDROLANT 1958/05 · Nav aids2005-10-27 → 2005-12-07
    Barns ness light 55-59.2N 002-26.8W discontinued
  3. HYDROLANT 1939/05 · Wrecks2005-10-24 → 2006-01-03
    19.9 meter depth reported in 51-16.77N 002-07.48E
  4. HYDROLANT 1914/05 · Other2005-10-19 → 2005-11-04
    Navigation prohibited until further notice within 500 meters of 56-23.9N 002-35.5W
  5. HYDROLANT 1910/05 · Nav aids2005-10-19 → 2005-10-21
    Coquet island light 55-20.0N 001-32.2W range unreliable and fog signal inoperative
  6. HYDROLANT 1906/05 · Nav aids2005-10-19 → 2005-10-19
    Coquet island light 55-20.0N 001-32.2W range unreliable
  7. HYDROLANT 1904/05 · Cable ops2005-10-18 → 2005-12-31
    Seismic survey in progress until further notice by M/V gd nalivkin towing 8000 meter long cable in area…
  8. HYDROLANT 1896/05 · Other2005-10-17 → 2005-10-19
    Navigation prohibited until further notice withn 1000 meters of 56-24.5N 002-35.0W
  9. HYDROLANT 1891/05 · Surveys2005-10-17 → 2005-11-23
    Underwater operations in progress until further notice by vessel aquamarine along trackline between 54-00.9N…
  10. HYDROLANT 1879/05 · Nav aids2005-10-15 → 2005-10-15
    RACON at foxtrot 3 lightship 51-24N 002-01E unreliable
  11. HYDROLANT 1878/05 · Nav aids2005-10-15 → 2005-10-15
    Coquet light 55-20N 001-32W unreliable
  12. HYDROLANT 1877/05 · Other2005-10-15 → 2005-10-17
    Navigation prohibited until further notice withn 500 meters of 56-22N 002-35W
  13. HYDROLANT 1874/05 · Nav aids2005-10-13 → 2005-10-14
    RACON at sandettie lightship 51-09.4N 001-47.1E inoperative
  14. HYDROLANT 1854/05 · Cable ops2005-10-10 → 2005-10-12
    Seismic survey in progress until further notice by M/V northern explorer towing 4.6 mile long cable in area…
  15. HYDROLANT 1839/05 · Other2005-10-07 → 2005-10-11
    Unexploded ordnance vicinity 52-40.56N 002-54.97E
  16. HYDROLANT 1831/05 · Other2005-10-06 → 2005-10-11
    Unexploded ordnance vicinity: a. 52-40.45N 002-49.43E
  17. HYDROLANT 1829/05 · Nav aids2005-10-06 → 2005-10-07
    Foxtrot three lightvessel 51-23.8N 002-00.6E RACON unreliable 0700Z to 1800Z daily 06 and 07 oct
  18. HYDROLANT 1809/05 · Other2005-10-03 → 2005-10-04
    Pentland skerries light 58-41.4N 002-55.4W at reduced intensity
  19. HYDROLANT 1764/05 · Exercises2005-09-28 → 2005-09-28
    Hazardous operations 280930Z to 281000Z sep within four miles of trackline between 54-03N 000-10E and 54-12N…
  20. HYDROLANT 1762/05 · Other2005-09-27 → 2005-10-06
    Unexploded ordnance in: a. 52-44.13N 002-56.03E

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