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 1815/18 · Other2018-06-08 → 2018-06-17
    Unexploded ordnance in: a. 52-10.9N 002-06.9E
  2. HYDROLANT 1814/18 · Surveys2018-06-08 → 2018-06-30
    Survey operations in progress until further notice by M/V polar duchess towing ten 7000 meter long cables in…
  3. HYDROLANT 1782/18 · Surveys2018-06-06 → 2018-06-20
    Underwater operations in progress until further notice by M/V havila phoenix in vicinity of trackline…
  4. HYDROLANT 1771/18 · Other2018-06-05 → 2018-06-08
    Unexploded ordnance in: a. 52-10.9N 002-06.9E b. 52-11.4N 002-12.6E
  5. HYDROLANT 1766/18 · Nav aids2018-06-04 → 2018-06-07
    Dgps station at flamborough head light 54-07N 000-05W off air 0730Z to 1600Z daily 05 thru 07 jun
  6. HYDROLANT 1762/18 · Surveys2018-06-04 → 2018-07-21
    Survey operations in progress until 31 jul by M/V wg amundsen towing ten 3000 meter long cables in area…
  7. HYDROLANT 1759/18 · Other2018-06-04 → 2018-07-09
    Unexploded ordnance in: a. 51-59.8N 001-26.0E
  8. HYDROLANT 1754/18 · Wrecks2018-06-04 → 2018-07-16
    7.8 meter depth reported in 51-23.8N 001-31.1E
  9. HYDROLANT 1747/18 · Surveys2018-06-03 → 2018-06-17
    Survey operations in progress until further notice by M/V atlantic guardian in area within eight miles of…
  10. HYDROLANT 1746/18 · Nav aids2018-06-03 → 2018-06-08
    All navigational aids at platform 48/6-B, 53-43.1N 001-07.1E inoperative
  11. HYDROLANT 1734/18 · Nav aids2018-06-01 → 2018-07-13
    Fog signal at platform 12/21C jacky, 58-11.0N 002-58.8W inoperative
  12. HYDROLANT 1732/18 · Nav aids2018-06-01 → 2018-07-13
    Duncansby head light 58-38.6N 003-01.5W range temporarily reduced to 12 miles
  13. HYDROLANT 1731/18 · Nav aids2018-06-01 → 2018-07-01
    Fog signal at platform 49/27-B, 53-03.1N 002-17.1E inoperative
  14. HYDROLANT 1718/18 · Nav aids2018-05-31 → 2018-06-08
    All navigational aids at platform 42/30-C, 54-05.0N 000-49.5E inoperative
  15. HYDROLANT 1717/18 · Wrecks2018-05-31 → 2018-07-12
    All navigational aids at sheringham shoal windfarm 53-08N 001-10E are inoperative
  16. HYDROLANT 1708/18 · Other2018-05-31 → 2018-06-05
    Unexploded ordnance in: a. 52-10.9N 002-06.9E b. 52-11.4N 002-12.6E
  17. HYDROLANT 1707/18 · Nav aids2018-05-31 → 2018-06-07
    All navigational aids at platform 48/17C, 53-21.1N 001-18.2E inoperative
  18. HYDROLANT 1699/18 · Other2018-05-30 → 2018-06-02
    Buoy, green, adrift in vicinity 53-52.4N 000-39.5E
  19. HYDROLANT 1673/18 · Other2018-05-27 → 2018-07-08
    Unexploded ordnance in 57-04.98N 002-01.18W
  20. HYDROLANT 1652/18 · Cable ops2018-05-25 → 2018-07-06
    Cable operations in progress until further notice by cableship connector and M/V lange wrapper in area bound…

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