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 516/13 · Nav aids2013-02-25 → 2013-04-08
    Cancel HYDROLANT 495/13(35,37), operations suspended
  2. HYDROLANT 512/13 · Nav aids2013-02-24 → 2013-02-25
    Dover Strait
  3. HYDROLANT 510/13 · Nav aids2013-02-24 → 2013-02-24
    Dover Strait
  4. HYDROLANT 495/13 · Other2013-02-22 → 2013-02-25
    One mile berth requested
  5. HYDROLANT 408/13 · Nav aids2013-02-14 → 2013-04-08
    Southern North Sea
  6. HYDROLANT 405/13 · Nav aids2013-02-14 → 2013-02-16
    Southern North Sea
  7. HYDROLANT 403/13 · Nav aids2013-02-13 → 2013-02-14
    Scotland-north Coast
  8. HYDROLANT 385/13 · Nav aids2013-02-12 → 2013-02-18
    England-southeast Coast
  9. HYDROLANT 372/13 · Nav aids2013-02-10 → 2013-03-02
    Cancel HYDROLANT 225/13
  10. HYDROLANT 371/13 · Nav aids2013-02-10 → 2013-02-15
    Scotland
  11. HYDROLANT 344/13 · Nav aids2013-02-07 → 2013-02-08
    Scotland-north Coast
  12. HYDROLANT 321/13 · Other2013-02-05 → 2013-03-20
    B. 49/17-DD 53-26.4N 002-23.6E
  13. HYDROLANT 308/13 · Other2013-02-04 → 2013-02-22
    One mile berth requested
  14. HYDROLANT 307/13 · Nav aids2013-02-04 → 2013-03-18
    Cancel HYDROLANT 3030/12
  15. HYDROLANT 306/13 · Nav aids2013-02-04 → 2013-02-19
    Southern North Sea
  16. HYDROLANT 285/13 · Nav aids2013-02-01 → 2013-02-01
    Shetland Islands
  17. HYDROLANT 274/13 · Other2013-01-30 → 2013-06-03
    Cancel HYDROLANT 143/13
  18. HYDROLANT 253/13 · Nav aids2013-01-28 → 2013-01-28
    Cullercoats 55-04N 001-28W transmitter off air
  19. HYDROLANT 248/13 · Cable ops2013-01-27 → 2013-04-07
    Seismic survey in progress until further notice by M/V oceanic challenger towing eight 5100 meter long…
  20. HYDROLANT 225/13 · Nav aids2013-01-25 → 2013-02-10
    Dover Strait

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