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 633/19 · Nav aids2019-02-27 → 2019-03-01
    Fog signal at platform 49/19-BG, 53-24.1N 002-39.3E inoperative
  2. HYDROLANT 630/19 · Cable ops2019-02-26 → 2019-04-09
    Cable operations in progress until further notice by M/V flintsone in area bound by 53-31.9N 000-02.2E,…
  3. HYDROLANT 626/19 · Nav aids2019-02-26 → 2019-03-01
    St
  4. HYDROLANT 553/19 · Nav aids2019-02-20 → 2019-02-20
    Bell rock light 56-26.1N 002-23.2W unlit and RACON inoperative
  5. HYDROLANT 552/19 · Nav aids2019-02-20 → 2019-02-21
    Cgoc aberdeen mf r/t and dsc services at greg ness site 57-08.3N 002-02.9W unreliable
  6. HYDROLANT 550/19 · Nav aids2019-02-19 → 2019-02-25
    Fog signal at platform 49/4B, 53-59.0N 000-47.3E inoperative
  7. HYDROLANT 531/19 · Nav aids2019-02-18 → 2019-02-19
    Cgoc aberdeen mf dsc and dgps services at greg ness site 57-08.3N 002-02.9W unreliable
  8. HYDROLANT 526/19 · Nav aids2019-02-18 → 2019-04-01
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  9. HYDROLANT 508/19 · Cable ops2019-02-16 → 2019-02-26
    Cable operations in progress until further notice by M/V hercules in area bound by 53-31.9N 000-02.2E,…
  10. HYDROLANT 474/19 · Other2019-02-13 → 2019-03-27
    Unexploded ordnance in: a. 52-18.44N 002-15.89E
  11. HYDROLANT 469/19 · Wrecks2019-02-13 → 2019-08-03
    Submerged obstruction reported in 59-19.7N 001-21.7E
  12. HYDROLANT 445/19 · Nav aids2019-02-10 → 2019-02-20
    Bell rock light 56-26.1N 002-23.2W unlit
  13. HYDROLANT 435/19 · Nav aids2019-02-08 → 2019-03-01
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  14. HYDROLANT 410/19 · Nav aids2019-02-07 → 2019-02-10
    Bell rock light 56-26.1N 002-23.2W unreliable
  15. HYDROLANT 408/19 · Nav aids2019-02-06 → 2019-02-07
    Sumburgh head light 59-51.2N 001-16.5W unreliable
  16. HYDROLANT 407/19 · Nav aids2019-02-06 → 2019-03-20
    All navigational aids at tethys platform 53-39.0N 002-03.5E inoperative
  17. HYDROLANT 390/19 · Nav aids2019-02-05 → 2019-03-19
    All navigational aids at platform 15/17-A, 58-25N 000-20E inoperative
  18. HYDROLANT 373/19 · Nav aids2019-02-04 → 2019-02-19
    All navigational aids at platform cavendish, 54-28.6N 001-44.4E inoperative
  19. HYDROLANT 372/19 · Nav aids2019-02-04 → 2019-03-15
    All navigational aids at platform 11/30-A, 58-06.9N 003-05.3W inoperative
  20. HYDROLANT 369/19 · Wrecks2019-02-04 → 2019-08-03
    Depths reported: a. 13.7 meters in 52-49.64N 002-04.92E

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