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 1221/22 · Nav aids2022-05-05 → 2022-05-08
    Sunk e buoy 51-53.20N 002-07.50E unlit and RACON inoperative
  2. HYDROLANT 1220/22 · Nav aids2022-05-05 → 2022-05-06
    RACON at inter bank buoy 51-16-30N 001-52-18E inoperative
  3. HYDROLANT 1213/22 · Surveys2022-05-04 → 2022-05-17
    Underwater operations in progress until 162359Z may by M/V artabro in vicinity of trackline joining 51-22.7N…
  4. HYDROLANT 1192/22 · Surveys2022-05-01 → 2022-05-02
    Underwater operations in progress until further notice by M/V havila phoenix in vicinity of trackline…
  5. HYDROLANT 1179/22 · Wrecks2022-04-29 → 2022-06-10
    Dangerous wreck, least depth 19.3 meters, in 56-38.8N 002-26.2W
  6. HYDROLANT 1163/22 · Nav aids2022-04-28 → 2022-04-29
    All navigational aids at platform 44/21A 54-14.6N 002-09.2E inoperative
  7. HYDROLANT 1162/22 · Nav aids2022-04-28 → 2022-04-28
    RACON at inter bank buoy 51-16-30N 001-52-18E inoperative
  8. HYDROLANT 1141/22 · Surveys2022-04-26 → 2022-05-29
    Survey operations 01 may until further notice by M/V ramform vanguard towing 12 9000 meter long cables in…
  9. HYDROLANT 1132/22 · Nav aids2022-04-25 → 2022-04-29
    All navigational aids at platform 48/14-PL, 53-34.1N 001-37.9E inoperative
  10. HYDROLANT 1128/22 · Nav aids2022-04-24 → 2022-05-26
    Cgoc aberdeen mf dsc and r/t services at gregness site 57-07.6N 002-03.2W unreliable
  11. HYDROLANT 1071/22 · Surveys2022-04-15 → 2022-06-13
    Survey operations in progress until further notice by M/V ramform hyperion towing nine 3700 meter long…
  12. HYDROLANT 1024/22 · Nav aids2022-04-10 → 2022-04-12
    Auskerry light 59-01.5N 002-34.3W unreliable
  13. HYDROLANT 1017/22 · Nav aids2022-04-09 → 2022-04-10
    Rova head light 60-11.4N 001-08.5W unreliable
  14. HYDROLANT 996/22 · Nav aids2022-04-08 → 2022-04-09
    Auskerry light 59-01-32N 002-34-20W unlit
  15. HYDROLANT 994/22 · Nav aids2022-04-07 → 2022-04-24
    Cgoc aberdeen mf dsc and r/t services at gregness site 57-07.6N 002-03.2W off air
  16. HYDROLANT 989/22 · Nav aids2022-04-07 → 2022-04-08
    Babbage platform 53-57.8N 001-13.1E unlit and aids to navigation inoperative
  17. HYDROLANT 985/22 · Nav aids2022-04-07 → 2022-04-11
    All navigational aids at platform 49/26-G, 53-07.0N 002-06.2E unlit and inoperative
  18. HYDROLANT 983/22 · Nav aids2022-04-06 → 2022-04-08
    Auskerry light 59-01.5N 002-34.3W unreliable
  19. HYDROLANT 950/22 · Surveys2022-04-03 → 2022-04-12
    Survey operations in progress until further notice by M/V amazon warrior towing two 8047 meter long cables…
  20. HYDROLANT 938/22 · Nav aids2022-04-01 → 2022-04-02
    Skroo light 59-33.1N 001-36.6W unlit

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