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 2044/21 · Nav aids2021-08-05 → 2021-08-12
    Cromer light 52-55.5N 001-19.0E unreliable
  2. HYDROLANT 2036/21 · Nav aids2021-08-04 → 2021-08-12
    Cgoc shetland mf dsc and r/t services at st margaret's hope site 58-49.3N 002-57.4W off air
  3. HYDROLANT 2034/21 · Nav aids2021-08-04 → 2021-08-05
    All navigational aids at platform 48/29-B 53-03.2N 001-41.1E unreliable
  4. HYDROLANT 2026/21 · Exercises2021-08-04 → 2021-08-05
    Hazardous operations 0800Z to 1000Z and 1330Z to 1530Z daily 04 and 05 aug in area bound by 55-50N 001-18W,…
  5. HYDROLANT 2016/21 · Nav aids2021-08-03 → 2021-08-26
    GPS jamming exercises 0830Z to 1130Z daily 03, 17, 19, 24 and 26 aug in areas within 30 miles of: a.…
  6. HYDROLANT 1993/21 · Nav aids2021-07-31 → 2021-08-06
    All navigational aids at platform 49/27-J 53-02.0N 002-13.2E inoperative
  7. HYDROLANT 1895/21 · Cable ops2021-07-19 → 2021-07-28
    Cable operations in progress until further notice by cableship sovereign in vicinity 57-24.4N 001-43.3W
  8. HYDROLANT 1878/21 · Nav aids2021-07-18 → 2021-08-29
    All navigational aids at shamrock platform 53-28.2N 002-55.2E inoperative
  9. HYDROLANT 1864/21 · Surveys2021-07-15 → 2021-08-16
    Survey operations in progress until further notice by M/V fugro galaxy and M/V highland eagle in area bound…
  10. HYDROLANT 1861/21 · Nav aids2021-07-14 → 2021-07-29
    All navigational aids at tethys platform 53-39.0N 002-03.3E inoperative
  11. HYDROLANT 1858/21 · Exercises2021-07-14 → 2021-07-14
    Hazardous operations in progress until 141800Z jul in area within ten miles of 54-07.2N 000-23.9E
  12. HYDROLANT 1855/21 · Exercises2021-07-14 → 2021-07-14
    Hazardous operations 141200Z to 141600Z jul in area within ten miles of 54-07.2N 000-23.9E
  13. HYDROLANT 1853/21 · Nav aids2021-07-13 → 2021-08-24
    All navigational aids at platform 49/27-H 53-00.3N 002-12.9E inoperative
  14. HYDROLANT 1829/21 · Nav aids2021-07-12 → 2021-07-15
    All navigational aids at platform 48/29-B 53-03.2N 001-41.1E inoperative
  15. HYDROLANT 1804/21 · Surveys2021-07-08 → 2021-07-24
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 10500 meter long cables…
  16. HYDROLANT 1797/21 · Nav aids2021-07-07 → 2021-07-10
    Kinnairds head light 57-41-51N 002-00-15W unreliable
  17. HYDROLANT 1785/21 · Nav aids2021-07-07 → 2021-07-11
    All navigational aids at platform hummingbird 57-58.6N 001-14.6E inoperative
  18. HYDROLANT 1783/21 · Surveys2021-07-07 → 2021-07-20
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter cable in…
  19. HYDROLANT 1782/21 · Other2021-07-07 → 2021-07-07
    Kinnaird head light 57-41-51N 002-00-15W reduced intensity
  20. HYDROLANT 1775/21 · Cable ops2021-07-06 → 2021-07-12
    Cable operations in progress until further notice by cableship sovereign in vicinity 57-24.4N 001-43.6W

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