North Sea

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

in force
3
last 12 months
3
since 1997
4,727
categories
11

In force now · 3

  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.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.

Longest in force

  1. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. 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 aids2,50053%
Other66814%
Cable ops65814%
Surveys58212%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,724 cancelled

  1. HYDROLANT 2190/18 · Cable ops2018-07-06 → 2018-07-12
    Cable operations in progress until further notice by M/V maersk connector in 51-19.6N 001-54.5E
  2. HYDROLANT 2172/18 · Other2018-07-04 → 2018-08-15
    Unexploded ordnance in 52-07.4N 001-50.4E
  3. HYDROLANT 2109/18 · Surveys2018-06-29 → 2018-07-19
    Survey operations in progress until further notice by M/V sanco swift towing 12 9000 meter long cables in…
  4. HYDROLANT 2085/18 · Cable ops2018-06-27 → 2018-07-04
    Cable operations in progress until further notice by M/V maersk connector in 51-19.6N 001-54.5E
  5. HYDROLANT 2084/18 · Nav aids2018-06-27 → 2018-06-27
    Dgps station at girdle ness light 57-08.3N 002-02.9W off air 270900Z to 271600Z jun
  6. HYDROLANT 2082/18 · Other2018-06-26 → 2018-08-07
    Unexploded ordnance in area bound by 52-05N 001-37E, 52-05N 001-45E, 51-58N 001-30E, 52-00N 001-30E
  7. HYDROLANT 2081/18 · Other2018-06-26 → 2018-06-26
    Unexploded ordnance located in vicinity 52-13.05N 002-27.50E
  8. HYDROLANT 2080/18 · Other2018-06-26 → 2018-06-26
    Unexploded ordnance in vicinity of trackline joining 51-59.5N 001-30.2E, 52-03.5N 001-37.1E and 52-03.7N…
  9. HYDROLANT 2063/18 · Other2018-06-25 → 2018-06-26
    Unexploded ordnance in vicinity of trackline between 52-03.5N 001-37.1E and 52-00.7N 001-32.7E
  10. HYDROLANT 2059/18 · Other2018-06-24 → 2018-06-25
    Unexploded ordnance in: a. 52-03.5N 001-37.1E
  11. HYDROLANT 1981/18 · Nav aids2018-06-20 → 2018-07-24
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  12. HYDROLANT 1977/18 · Nav aids2018-06-19 → 2018-07-31
    All navigational aids at dudgeon wind farm turbine A5, 53-15.7N 001-19.2E inoperative
  13. HYDROLANT 1970/18 · Cable ops2018-06-18 → 2018-06-26
    Cable operations in progress until further notice by M/V maersk connector in 51-19.6N 001-54.4E
  14. HYDROLANT 1953/18 · Other2018-06-17 → 2018-06-18
    Unexploded ordnance in: a. 52-10.9N 002-06.9E
  15. HYDROLANT 1904/18 · Other2018-06-14 → 2018-11-30
    Unexploded ordnance in 51-19.31N 001-56.12E
  16. HYDROLANT 1890/18 · Cable ops2018-06-13 → 2018-06-17
    Underwater operations in progress until further notice by cableship pierre de fermat with submersible in…
  17. HYDROLANT 1872/18 · Other2018-06-12 → 2018-06-24
    Unexploded ordnance in: a. 52-03.5N 001-37.1E
  18. HYDROLANT 1865/18 · Surveys2018-06-11 → 2018-06-14
    Underwater operations in progress until further notice by M/V maersk connector in 51-19.3N 001-54.4E
  19. HYDROLANT 1842/18 · Other2018-06-09 → 2018-06-14
    Unexploded ordnance in 51-19.31N 001-56.12E
  20. HYDROLANT 1820/18 · Cable ops2018-06-08 → 2018-06-13
    Underwater operations in progress until further notice by cableship pierre de fermat with submersible in…

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