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 1345/21 · Surveys2021-05-18 → 2021-05-22
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  2. HYDROLANT 1324/21 · Surveys2021-05-16 → 2021-05-18
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable…
  3. HYDROLANT 1309/21 · Surveys2021-05-14 → 2021-05-16
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  4. HYDROLANT 1306/21 · Surveys2021-05-13 → 2021-05-14
    Survey operations in progress until further notice by M/V akademik lazarev towing one 7000 meter long cable…
  5. HYDROLANT 1263/21 · Nav aids2021-05-08 → 2021-07-02
    All navigational aids at platform 49/27-J 53-02.0N 002-13.2E inoperative
  6. HYDROLANT 1203/21 · Surveys2021-05-01 → 2021-05-24
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 6500 meter long cables…
  7. HYDROLANT 1196/21 · Wrecks2021-04-30 → 2021-06-10
    Dangerous wreck, least depth 10.3 meters, in 52-22.2N 002-02.9E
  8. HYDROLANT 1147/21 · Surveys2021-04-26 → 2021-04-27
    Survey operations in progress until further notice by M/V sw amundsen towing eight 8000 meter long cables…
  9. HYDROLANT 1144/21 · Nav aids2021-04-25 → 2021-06-06
    All navigational aids at shamrock platform 53-28.2N 002-55.2E inoperative
  10. HYDROLANT 1138/21 · Nav aids2021-04-24 → 2021-04-29
    Cgoc shetland mf dsc services at st margarets hope site 58-49.3N 002-57.4W off air
  11. HYDROLANT 1122/21 · Surveys2021-04-23 → 2021-05-01
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 6500 meter long cables…
  12. HYDROLANT 1115/21 · Surveys2021-04-22 → 2021-04-25
    Survey operations in progress until further notice by M/V sw amundsen towing eight 8000 meter long cables,…
  13. HYDROLANT 1098/21 · Nav aids2021-04-21 → 2021-04-23
    All navigational aids at platform 49/18-AP, 53-21.8N 002-34.1E inoperative
  14. HYDROLANT 1023/21 · Exercises2021-04-14 → 2021-04-16
    Hazardous operations in progress until further notice in area within 500 meters of 53-18.3N 001-23.2E
  15. HYDROLANT 1011/21 · Surveys2021-04-13 → 2021-05-15
    Survey operations until further notice by M/V ramform hyperion towing 12 6000 meter long cables in area…
  16. HYDROLANT 998/21 · Surveys2021-04-12 → 2021-05-24
    Survey operations in progress until 12 jul by M/V fugro frontier, M/V fugro venturer and M/V fugro searcher…
  17. HYDROLANT 937/21 · Nav aids2021-04-06 → 2021-05-05
    All navigational aids at platform 48/29-B, 53-03.3N 001-41.0E inoperative
  18. HYDROLANT 847/21 · Nav aids2021-03-28 → 2021-03-29
    Cgoc aberdeen mf r/t services at greg ness site 57-07.6N 002-03.2W off air
  19. HYDROLANT 774/21 · Nav aids2021-03-19 → 2021-04-30
    Fog signal at platform 49/24, 53-13.9N 002-37.3E inoperative
  20. HYDROLANT 770/21 · Nav aids2021-03-18 → 2021-03-18
    RACON at st

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