North Sea

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

in force
1
last 12 months
6
since 1997
4,730
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%
Other66814%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,729 cancelled

  1. HYDROLANT 2060/15 · Other2015-08-21 → 2015-09-25
    Unexploded ordnance marked by buoys, yellow, l fl y 15 sec, in: a. 53-02.1N 000-26.3E
  2. HYDROLANT 2050/15 · Cable ops2015-08-21 → 2015-08-24
    Seismic survey in progress until further notice by M/V western regent towing 8400 meter long cable vicinity…
  3. HYDROLANT 2039/15 · Cable ops2015-08-19 → 2015-08-31
    Seismic survey in progress until further notice by M/V ramform challenger towing ten 9000 meter long cables…
  4. HYDROLANT 2020/15 · Nav aids2015-08-18 → 2016-06-09
    Isle of may light 56-11.1N 002-33.5W range temporarily reduced to ten miles
  5. HYDROLANT 2018/15 · Cable ops2015-08-18 → 2015-08-21
    Seismic survey in progress until further notice by M/V western regent towing 8400 meter long cable vicinity…
  6. HYDROLANT 2000/15 · Nav aids2015-08-15 → 2015-08-18
    Southwold light 52-19.6N 001-40.9E unreliable
  7. HYDROLANT 1995/15 · Cable ops2015-08-14 → 2015-08-21
    Underwater operations in progress until further notice by cableship pierre de fermat with submersible along…
  8. HYDROLANT 1994/15 · Other2015-08-14 → 2015-08-17
    Fishing gear with floats adrift in 58-05N 001-05E at 141700Z aug
  9. HYDROLANT 1992/15 · Nav aids2015-08-14 → 2015-08-18
    All navigational aids at platform 44/23, 54-19.9N 002-28.8E unreliable
  10. HYDROLANT 1991/15 · Nav aids2015-08-14 → 2015-08-19
    Fog signal at platform 49/23-D, 53-18.1N 002-30.0E inoperative
  11. HYDROLANT 1982/15 · Cable ops2015-08-13 → 2015-08-18
    Seismic survey in progress until further notice by M/V western regent towing 8400 meter long cable along…
  12. HYDROLANT 1977/15 · Nav aids2015-08-13 → 2015-08-18
    All navigational aids at platform 49/17-DD, 53-26.4N 002-23.1E inoperative
  13. HYDROLANT 1976/15 · Other2015-08-13 → 2015-08-13
    All navigational aids at platforms inoperative: a. 49/17-DD, 53-26.4N 002-23.1E
  14. HYDROLANT 1966/15 · Nav aids2015-08-11 → 2015-08-18
    Isle of may light 56-11.1N 002-33.5W range temporarily reduced to ten miles
  15. HYDROLANT 1955/15 · Cable ops2015-08-10 → 2015-08-13
    Seismic survey in progress until further notice by M/V western regent towing 8400 meter long cable in area…
  16. HYDROLANT 1931/15 · Cable ops2015-08-07 → 2015-08-10
    Seismic survey in progress until further notice by M/V western regent towing 8400 meter long cable in area…
  17. HYDROLANT 1919/15 · Nav aids2015-08-06 → 2015-08-06
    Stirling dgps station 56-04N 004-04W off air 060900Z to 061300Z aug
  18. HYDROLANT 1918/15 · Cable ops2015-08-06 → 2015-08-07
    Seismic survey in progress until further notice by M/V western regent towing 8400 meter long cable in area…
  19. HYDROLANT 1914/15 · Other2015-08-05 → 2015-08-13
    All navigational aids at platforms inoperative: a. 49/17-DD, 53-26.4N 002-23.1E
  20. HYDROLANT 1912/15 · Cable ops2015-08-05 → 2015-08-10
    Seismic survey in progress until further notice by M/V ramform explorer towing eight 6000 meter long cables…

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