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 1575/18 · Surveys2018-05-19 → 2018-06-08
    Survey operations in progress by M/V polar duchess towing ten 7000 meter long cables in area bound by 57-55N…
  2. HYDROLANT 1565/18 · Nav aids2018-05-18 → 2018-05-20
    All navigational aids at platform 48/11-A, 53-31.5N 001-09.6E inoperative
  3. HYDROLANT 1559/18 · Other2018-05-18 → 2018-06-29
    Unexploded ordnance in 53-53.05N 001-39.55E
  4. HYDROLANT 1558/18 · Nav aids2018-05-18 → 2018-06-13
    All navigational aids at dudgron wind farm turbine E6 53-18.83N 001-20.59E inoperative
  5. HYDROLANT 1461/18 · Other2018-05-10 → 2018-05-11
    All navigational aids at platforms 49/11A, 53-32.4N 002-00.9E inoperative
  6. HYDROLANT 1443/18 · Nav aids2018-05-08 → 2018-06-20
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  7. HYDROLANT 1442/18 · Other2018-05-08 → 2018-05-31
    Unexploded ordnance in: a. 52-10.9N 002-06.9E b. 52-11.5N 002-12.9E
  8. HYDROLANT 1380/18 · Surveys2018-05-02 → 2018-07-29
    Survey operations in progress until 01 aug by M/V wg cook, M/V wg tasman, M/V geco emerald and M/V mainport…
  9. HYDROLANT 1373/18 · Nav aids2018-05-01 → 2018-05-01
    RACON at dudgeon light 53-16.6N 001-17.0E inoperative
  10. HYDROLANT 1370/18 · Nav aids2018-04-30 → 2018-05-17
    Dgps station at flamborough head light 54-07N 000-05W unreliable
  11. HYDROLANT 1353/18 · Other2018-04-28 → 2018-06-09
    Unexploded ordnance in 51-19.31N 001-56.12E
  12. HYDROLANT 1339/18 · Wrecks2018-04-27 → 2018-05-15
    Fog signals at sheringham shoal wind farm 53-08N 001-10E unreliable
  13. HYDROLANT 1314/18 · Surveys2018-04-25 → 2018-06-06
    Underwater operations in progress until further notice by M/V havila phoenix in vicinity of trackline…
  14. HYDROLANT 1306/18 · Nav aids2018-04-24 → 2018-05-02
    All navigational aids at platform 48/17C, 53-21.1N 001-18.2E inoperative
  15. HYDROLANT 1286/18 · Other2018-04-23 → 2018-06-04
    Unexploded ordnance in: a. 51-59.8N 001-26.0E
  16. HYDROLANT 1261/18 · Nav aids2018-04-21 → 2018-04-24
    Start point light 59-16.6N 002-22.6W unreliable
  17. HYDROLANT 1260/18 · Nav aids2018-04-20 → 2018-06-01
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  18. HYDROLANT 1225/18 · Surveys2018-04-17 → 2018-04-23
    Underwater operations in progress until further notice by M/V edda freya in vicinity of trackline joining…
  19. HYDROLANT 1199/18 · Cable ops2018-04-13 → 2018-05-25
    Cable operations in progress until further notice by cableship connector and M/V lange wrapper in area bound…
  20. HYDROLANT 1193/18 · Other2018-04-13 → 2018-04-23
    Unexploded ordnance in: a. 51-59.8N 001-26.0E

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