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 1637/19 · Other2019-05-29 → 2019-06-18
    Unexploded ordnance reported in vicinity of tracklines joining: a. 53-55.5N 001-38.0E, 53-48.5N 001-30.5E,…
  2. HYDROLANT 1588/19 · Nav aids2019-05-25 → 2019-06-28
    Bessemer gas platform 53-11.9N 002-29.1E unlit
  3. HYDROLANT 1572/19 · Other2019-05-24 → 2019-05-29
    Unexploded ordnance reported in vicinity of trackline joining 53-55.5N 001-38.0E, 53-48.5N 001-30.5E,…
  4. HYDROLANT 1564/19 · Nav aids2019-05-23 → 2019-05-25
    All navigational aids at platform 42/30-A, 54-01.7N 000-58.0E inoperative
  5. HYDROLANT 1550/19 · Surveys2019-05-23 → 2019-07-12
    Survey operations in progress until further notice by M/V akademik primakov towing ten 7000 meter long…
  6. HYDROLANT 1547/19 · Other2019-05-22 → 2019-05-24
    Unexploded ordnance reported in vicinity: a. 53-55.5N 001-38.1E
  7. HYDROLANT 1533/19 · Nav aids2019-05-21 → 2019-05-27
    All navigational aids at platform 49/21-PRD, 53-14.8N 002-01.4E inoperative
  8. HYDROLANT 1515/19 · Other2019-05-17 → 2019-05-22
    Unexploded ordnance reported in: a. 53-55.5N 001-38.1E
  9. HYDROLANT 1466/19 · Other2019-05-14 → 2019-06-25
    All navigational aids at race bank windfarm 53-16N 000-50E unreliable
  10. HYDROLANT 1455/19 · Nav aids2019-05-13 → 2019-06-24
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  11. HYDROLANT 1447/19 · Cable ops2019-05-11 → 2019-09-22
    Cable operations in progress until further notice by cableship ile de batz in area bound by 58-57N 002-36E,…
  12. HYDROLANT 1423/19 · Surveys2019-05-09 → 2019-05-09
    Survey operations in progress until further notice by M/V maxlimer along trackline joining 51-18.9N…
  13. HYDROLANT 1349/19 · Surveys2019-05-01 → 2019-05-31
    Underwater operations in progress until further notice by M/V fpv flintstone in vicinity of trackline…
  14. HYDROLANT 1304/19 · Nav aids2019-04-28 → 2019-04-28
    Foxtrot 3 lightship 51-23.8N 002-00.6E unlit
  15. HYDROLANT 1270/19 · Nav aids2019-04-24 → 2019-06-05
    All navigational aids at wenlock platform, 53-35.3N 002-17.7E inoperative
  16. HYDROLANT 1263/19 · Nav aids2019-04-24 → 2019-06-05
    Cgoc aberdeen mf dsc services at greg ness site 57-08.3N 002-02.9W unreliable
  17. HYDROLANT 1225/19 · Nav aids2019-04-19 → 2019-05-25
    Main navigational lights at bessemer gas platform, 53-11.9N 002-29.1E inoperative
  18. HYDROLANT 1210/19 · Nav aids2019-04-18 → 2019-04-19
    Tarbat ness light 57-51.9N 003-46.6W unreliable
  19. HYDROLANT 1198/19 · Other2019-04-17 → 2019-04-18
    All navigational aids inoperative at platforms: a. 49/19-BG, 53-26.5N 002-41.8E
  20. HYDROLANT 1125/19 · Nav aids2019-04-10 → 2019-04-19
    All navigational aids at platform 49/21 rd, 53-14.9N 002-01.5E inoperative

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