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
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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 1211/15 · Cable ops2015-05-18 → 2015-06-06
    Seismic survey in progress until further notice by M/V ramform challenger towing 12 7500 meter long cables…
  2. HYDROLANT 1210/15 · Nav aids2015-05-18 → 2015-05-19
    Skadan light 59-30.9N 001-39.0W unlit
  3. HYDROLANT 1206/15 · Other2015-05-17 → 2015-05-30
    All navigational aids at platforms inoperative: a. 49/12-AR, 53-32.1N 002-15.4E
  4. HYDROLANT 1202/15 · Nav aids2015-05-17 → 2015-05-19
    Loran-c station sylt (54-48N 008-18E), rates 7499-MASTER and 6731-Z, off air 0600Z to 1400Z daily 19 and 20…
  5. HYDROLANT 1189/15 · Other2015-05-14 → 2015-05-22
    Fishing gear marked by buoys abandoned in 54-11.4N 000-03.9E
  6. HYDROLANT 1152/15 · Cable ops2015-05-12 → 2015-06-22
    Seismic survey in progress until further notice by M/V ramform explorer towing 11 6500 meter long cables in…
  7. HYDROLANT 1136/15 · Cable ops2015-05-10 → 2015-05-12
    Seismic survey in progress until further notice by M/V ramform explorer towing six 6500 meter long cables in…
  8. HYDROLANT 1129/15 · Nav aids2015-05-09 → 2015-05-09
    Isle of may light 56-11.2N 002-33.3W unreliable
  9. HYDROLANT 1127/15 · Other2015-05-08 → 2015-06-04
    Humber lightfloat 53-39.1N 000-20.0E temporarily replaced by buoy, green, lfl g 10 sec
  10. HYDROLANT 1109/15 · Other2015-05-07 → 2015-05-18
    Underwater ordnance detonations 08 may until further notice by M/V stril explorer in area bound by 53-19.5N…
  11. HYDROLANT 1058/15 · Nav aids2015-05-01 → 2015-05-01
    Fog signal at platform 44/22A-M, 54-16.1N 002-19.3E inoperative
  12. HYDROLANT 1056/15 · Other2015-05-01 → 2017-01-27
    Navigation prohibited until further notice within 500 meters of 58-00.79N 000-55.38W
  13. HYDROLANT 1042/15 · Other2015-04-29 → 2015-05-17
    All navigational aids at platforms inoperative: a. 49/17-DD, 53-26.4N 002-23.6E
  14. HYDROLANT 1028/15 · Other2015-04-28 → 2015-04-29
    All navigational aids at platforms inoperative: a. 49/17-DD, 53-26.4N 002-23.6E
  15. HYDROLANT 973/15 · Nav aids2015-04-22 → 2015-04-30
    All navigational aids at platform 49/29A, 58-00.1N 000-23.0W inoperative
  16. HYDROLANT 960/15 · Nav aids2015-04-21 → 2015-05-02
    Ruytingen sw buoy 51-05.0N 001-46.8E missing
  17. HYDROLANT 958/15 · Nav aids2015-04-21 → 2015-04-28
    All navigational aids at platform 49/11A-PWD, 53-32.4N 002-00.9E inoperative
  18. HYDROLANT 932/15 · Cable ops2015-04-18 → 2015-04-22
    Underwater operations in progress until further notice by cableship pierre de fermat with submersible…
  19. HYDROLANT 904/15 · Nav aids2015-04-16 → 2015-04-21
    Ruytingen sw buoy 51-05.0N 001-46.8E missing
  20. HYDROLANT 899/15 · Cable ops2015-04-15 → 2015-04-18
    Cable repair operations in progress until further notice by cableship pierre de fermat vicinity of trackline…

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