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 1544/16 · Nav aids2016-06-20 → 2016-07-11
    Hinder 1 buoy 51-20.8N 002-11.0E off station
  2. HYDROLANT 1518/16 · Surveys2016-06-17 → 2016-06-18
    Survey operations in progress until further notice by M/V ivero vicinity of trackline between 51-19N 002-16E…
  3. HYDROLANT 1515/16 · Surveys2016-06-17 → 2016-06-19
    Underwater operations in progress until further notice by M/V titan discovery vicinity of trackline between…
  4. HYDROLANT 1512/16 · Other2016-06-17 → 2016-06-22
    Unexploded ordnance: a. 52-09.93N 001-42.82E
  5. HYDROLANT 1505/16 · Other2016-06-16 → 2016-07-15
    Unexploded ordnance: a. in 51-59.50N 001-59.74E
  6. HYDROLANT 1504/16 · Other2016-06-16 → 2016-06-27
    Unexploded ordnance vicinity of trackline joining 52-05.59N 001-47.26E, 52-03.77N 001-48.30E, 52-03.23N…
  7. HYDROLANT 1498/16 · Surveys2016-06-16 → 2016-06-21
    Underwater operations in progress until further notice by M/V deep helder vicinity of trackline between…
  8. HYDROLANT 1492/16 · Nav aids2016-06-15 → 2016-06-17
    All navigational aids at platform audrey bravo, 53-34.1N 001-58.3E inoperative
  9. HYDROLANT 1480/16 · Other2016-06-14 → 2016-06-16
    Unexploded ordnance: a. 51-59.50N 001-59.74E
  10. HYDROLANT 1475/16 · Surveys2016-06-14 → 2016-06-17
    Survey operations in progress until further notice by M/V ivero vicinity of trackline between 51-20N 001-42E…
  11. HYDROLANT 1437/16 · Mines2016-06-10 → 2016-06-13
    Possible mine adrift in 56-35.9N 001-56.5W at 101010Z jun
  12. HYDROLANT 1434/16 · Surveys2016-06-10 → 2016-06-11
    Survey operations in progress until further notice by M/V ivero vicinity of trackline between 51-20N 002-00E…
  13. HYDROLANT 1418/16 · Nav aids2016-06-09 → 2016-07-20
    All navigational aids at platform 42/30-B 54-03.6N 000-54.0E inoperative
  14. HYDROLANT 1413/16 · Surveys2016-06-09 → 2016-06-10
    Underwater operations in progress until further notice by M/V deep helder vicinity of trackline between…
  15. HYDROLANT 1408/16 · Other2016-06-08 → 2016-06-14
    Unexploded ordnance: a. 51-59.50N 001-59.74E
  16. HYDROLANT 1403/16 · Surveys2016-06-08 → 2016-06-10
    Survey operations in progress until further notice by M/V ivero vicinity of trackline between 51-20N 001-40E…
  17. HYDROLANT 1402/16 · Mines2016-06-08 → 2016-06-11
    Possible mine adrift in 56-15.18N 001-49.98W at 080722Z jun
  18. HYDROLANT 1398/16 · Surveys2016-06-07 → 2016-06-08
    Survey operations in progress until further notice by M/V ivero vicinity of trackline between 51-19N 001-50E…
  19. HYDROLANT 1394/16 · Surveys2016-06-07 → 2016-06-10
    Underwater operations in progress until 100900Z jun by M/V deep helder vicinity of trackline between 51-19N…
  20. HYDROLANT 1392/16 · Surveys2016-06-07 → 2016-06-07
    Survey operations in progress until further notice by M/V ivero vicinity of trackline between 51-19N 001-35E…

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