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 784/12 · Nav aids2012-04-09 → 2012-04-09
    Mrcc aberdeen mf r/t service at greg ness 57-08N 002-03W off air
  2. HYDROLANT 772/12 · Nav aids2012-04-07 → 2012-04-08
    Mrcc aberdeen mf r/t service at greg ness 57-08N 002-03W off air
  3. HYDROLANT 767/12 · Nav aids2012-04-06 → 2012-05-15
    Southern North Sea
  4. HYDROLANT 762/12 · Nav aids2012-04-06 → 2012-04-06
    North Sea
  5. HYDROLANT 746/12 · Nav aids2012-04-04 → 2012-05-16
    Cancel HYDROLANT 410/12
  6. HYDROLANT 728/12 · Nav aids2012-04-01 → 2012-04-02
    Scotland-east Coast
  7. HYDROLANT 726/12 · Nav aids2012-04-01 → 2012-04-02
    Scotland-east Coast
  8. HYDROLANT 705/12 · Nav aids2012-03-30 → 2012-03-30
    Cancel this msg 301400Z mar
  9. HYDROLANT 694/12 · Nav aids2012-03-28 → 2012-03-29
    Scotland-east Coast
  10. HYDROLANT 686/12 · Other2012-03-27 → 2012-05-07
    North Sea
  11. HYDROLANT 683/12 · Cable ops2012-03-27 → 2012-05-11
    Seismic survey in progress until further notice by M/V polarcus samur towing eight 6000 meter long cables in…
  12. HYDROLANT 669/12 · Nav aids2012-03-25 → 2012-03-27
    Fair Isle
  13. HYDROLANT 668/12 · Cable ops2012-03-25 → 2012-05-08
    Seismic survey in progress until further notice by M/V oceanic challenger towing ten 4500 meter long cables…
  14. HYDROLANT 651/12 · Nav aids2012-03-24 → 2012-03-24
    Fair Isle
  15. HYDROLANT 641/12 · Other2012-03-22 → 2017-01-27
    North Sea
  16. HYDROLANT 633/12 · Cable ops2012-03-22 → 2012-03-27
    Seismic survey in progress by M/V polarcus samur towing eight 6000 meter long cables in area bound by…
  17. HYDROLANT 621/12 · Nav aids2012-03-19 → 2012-03-29
    Mrcc humber mf dsc at flamborough head 54-07N 000-05W unreliable
  18. HYDROLANT 577/12 · Surveys2012-03-11 → 2012-04-22
    Underwater operations in progress until further notice by M/V stril explorer within 1.5 miles of 56-11.4N…
  19. HYDROLANT 571/12 · Nav aids2012-03-11 → 2012-03-11
    England-east Coast
  20. HYDROLANT 539/12 · Other2012-03-09 → 2012-04-26
    England-east Coast

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