North Sea

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

in force
1
last 12 months
7
since 1997
4,732
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 aids2,50353%
Other66914%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,731 cancelled

  1. HYDROLANT 2197/00 · Nav aids2000-06-20 → 2000-06-21
    Dgps station at flamborough head light 54-07N 000-57W unreliable 0900Z to 1200Z daily 20 and 21 jun
  2. HYDROLANT 2167/00 · Surveys2000-06-16 → 2000-06-21
    Underwater operations in progress until further notice by M/V mansal 18 vicinity of trackline between 52-26N…
  3. HYDROLANT 2115/00 · Cable ops2000-06-12 → 2000-06-14
    Underwater operations in progress until further notice by cableship monarch with submersible vicinity of…
  4. HYDROLANT 2109/00 · Nav aids2000-06-12 → 2000-06-16
    RACON at orford ness light 52-05N 001-35E inoperative until 15 jun
  5. HYDROLANT 2093/00 · Surveys2000-06-11 → 2000-07-02
    Underwater operations in progress until further notice by M/V goosander vicinity 51-22.3N 002-30.4E
  6. HYDROLANT 2074/00 · Nav aids2000-06-09 → 2000-06-09
    RACON at orfordness light 52-05N 001-35E unreliable 090830Z to 091530Z jun
  7. HYDROLANT 2054/00 · Nav aids2000-06-07 → 2000-06-08
    RACON at orfordness light 52-05N 001-35E unreliable 0800Z to 1600Z daily 07 and 08 jun
  8. HYDROLANT 2028/00 · Cable ops2000-06-05 → 2000-06-20
    Underwater pipeline operations in progress until further notice by M/V trenchsetter with submersible and M/V…
  9. HYDROLANT 1971/00 · Nav aids2000-05-31 → 2000-06-01
    RACON at saint abbs head light 55-55N 002-08W inoperative
  10. HYDROLANT 1954/00 · Cable ops2000-05-30 → 2000-06-01
    Underwater operations in progress until further notice by cableship monarch within one mile of 51-04.3N…
  11. HYDROLANT 1918/00 · Nav aids2000-05-26 → 2000-09-29
    Orford ness light 52-05N 001-35E changed to: f wrg 14 meters 17 to 12 miles
  12. HYDROLANT 1916/00 · Cable ops2000-05-26 → 2000-06-03
    Cable operations in progress until further notice by cableship bold endurance vicinity of trackline joining…
  13. HYDROLANT 1876/00 · Cable ops2000-05-24 → 2000-05-25
    Cable laying operations in progress until further notice by cableship monarch within one mile of 51-32N…
  14. HYDROLANT 1857/00 · Surveys2000-05-22 → 2000-05-24
    Underwater operations in progress until further notice by M/V toisa crest vicinity of trackline between…
  15. HYDROLANT 1851/00 · Nav aids2000-05-22 → 2000-07-12
    Stonehaven outer breakwater light 56-48N 002-12W unreliable
  16. HYDROLANT 1783/00 · Nav aids2000-05-18 → 2000-07-14
    Orford ness light 52-05N 001-35E range reduced to 20 miles
  17. HYDROLANT 1779/00 · Other2000-05-17 → 2000-05-18
    F3 lightfloat 51-24N 002-01E at reduced intensity
  18. HYDROLANT 1774/00 · Cable ops2000-05-17 → 2000-06-09
    Cable laying operations in progress until further notice by cableship bold endeavour vicinity of trackline…
  19. HYDROLANT 1765/00 · Nav aids2000-05-17 → 2000-05-22
    Ruytingen nw buoy 51-09N 001-57E unlit
  20. HYDROLANT 1743/00 · Surveys2000-05-15 → 2000-06-21
    Underwater operations in progress until further notice by M/V seaworker in area bound by 54-37.5N 001-01.8W,…

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