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 311/18 · Nav aids2018-01-28 → 2018-01-30
    All navigational aids at platform 49/10A, 53-43.0N 002-51.2E inoperative
  2. HYDROLANT 293/18 · Nav aids2018-01-26 → 2018-03-06
    Platform 11/30-C 58-05.7N 003-09.1W unlit
  3. HYDROLANT 283/18 · Nav aids2018-01-26 → 2018-01-26
    Dgps station at flamborough head light 54-07N 000-05W off air
  4. HYDROLANT 262/18 · Nav aids2018-01-24 → 2018-01-29
    Bell rock light 56-26.1N 002-23.2W unlit
  5. HYDROLANT 248/18 · Nav aids2018-01-23 → 2018-01-24
    Bell rock light 56-26.1N 002-23.2W unreliable
  6. HYDROLANT 236/18 · Nav aids2018-01-22 → 2018-01-23
    All navigational aids at platform 49/25A, 53-13.6N 002-49.7E inoperative
  7. HYDROLANT 202/18 · Other2018-01-17 → 2018-02-28
    Unexploded ordnance in 53-53.05N 001-39.55E
  8. HYDROLANT 175/18 · Nav aids2018-01-15 → 2018-01-23
    All navigational aids at tethys platform 53-39.1N 002-03.5E inoperative
  9. HYDROLANT 167/18 · Nav aids2018-01-14 → 2018-02-25
    Platform 14/29A goldeneye, 58-00.1N 000-22.9W lights unreliable
  10. HYDROLANT 164/18 · Other2018-01-14 → 2018-02-02
    Fishing gear, marked by buoys, abandoned in 54-57.2N 001-15.2W
  11. HYDROLANT 132/18 · Nav aids2018-01-11 → 2018-01-21
    All navigational aids at platform 48/17C, 53-21.1N 001-18.2E inoperative
  12. HYDROLANT 97/18 · Nav aids2018-01-08 → 2018-01-09
    Dgps station at sumburgh head light 59-51.2N 001-16.5W, off air 090900Z to 121700Z jan
  13. HYDROLANT 44/18 · Nav aids2018-01-04 → 2018-02-15
    Fog signal at platform 49/9-QC, 53-41.7N 002-37.3E unreliable
  14. HYDROLANT 37/18 · Cable ops2018-01-04 → 2018-01-13
    Underwater operations in progress until further notice by cableship sovereign with submersible in vicinity…
  15. HYDROLANT 13/18 · Nav aids2018-01-02 → 2018-02-13
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  16. HYDROLANT 10/18 · Nav aids2018-01-02 → 2018-01-03
    RACON at buchan ness light 57-28.2N 001-46.5W inoperative
  17. HYDROLANT 3/18 · Nav aids2018-01-01 → 2018-01-12
    Platform 49/16-PQD, 53-22.7N 002-06.7E unlit
  18. HYDROLANT 4234/17 · Cable ops2017-12-29 → 2018-01-02
    Underwater operations in progress until further notice by cableship pierre de fermat in area bound by…
  19. HYDROLANT 4217/17 · Other2017-12-28 → 2017-12-30
    All navigational aids at platforms 49/11A, 53-32.4N 002-00.9E inoperative
  20. HYDROLANT 4214/17 · Other2017-12-28 → 2017-12-28
    All navigational aids at platforms inoperative: a. 49/11A, 53-32.4N 002-00.9E

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