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 2221/22 · Nav aids2022-09-05 → 2022-09-13
    NAVTEX station cullercoats (g) 55-04.48N 001-27.79W off air until 200100Z sep
  2. HYDROLANT 2210/22 · Surveys2022-09-04 → 2022-10-07
    Survey operations in progress until further notice by M/V sw bly towing 12 5000 meter long cables in area…
  3. HYDROLANT 2182/22 · Surveys2022-09-02 → 2022-09-28
    Survey operations in progress until further notice by M/V amazon conqueror towing 14 8700 meter long cables…
  4. HYDROLANT 2161/22 · Other2022-08-31 → 2022-09-16
    Salvage and pollution response operations in progress until further noticeby M/V atlantica supplier, M/V sar…
  5. HYDROLANT 2147/22 · Nav aids2022-08-30 → 2022-10-11
    Cavendish platform 54-28.70N 001-44.40E
  6. HYDROLANT 2135/22 · Nav aids2022-08-29 → 2022-08-31
    Platform 44/21A, 54-14.60N 002-09.20E unlit and all navaids inoperative
  7. HYDROLANT 2132/22 · Surveys2022-08-29 → 2022-09-02
    Survey operations in progress until further notice by M/V amazon conqueror towing 14 8700 meter long cables…
  8. HYDROLANT 2125/22 · Surveys2022-08-28 → 2022-09-04
    Survey operations in progress until further notice by M/V sw bly towing 12 5000 meter long cables in area…
  9. HYDROLANT 2118/22 · Surveys2022-08-27 → 2022-08-28
    Survey operations in progress until further notice by M/V sw bly towing 12 5000 meter long cables in area…
  10. HYDROLANT 2108/22 · Nav aids2022-08-26 → 2022-08-28
    All navigational aids at platform 49/27-J in 53-01.90N 002-13.10E inoperative
  11. HYDROLANT 2095/22 · Other2022-08-24 → 2022-08-31
    Salvage and pollution response operations in progress until further notice by M/V willchallenge, M/V sartor,…
  12. HYDROLANT 2074/22 · Other2022-08-22 → 2022-08-24
    Salvage and pollution response operations in progress until further notice by M/V willchallenge, M/V sartor,…
  13. HYDROLANT 2055/22 · Other2022-08-19 → 2022-08-22
    Salvage and pollution response operations in progress until further notice by M/V willchallenge, M/V sartor,…
  14. HYDROLANT 2044/22 · Other2022-08-17 → 2022-08-19
    Salvage and pollution response operations in progress until further notice by M/V willchallenge, M/V sartor,…
  15. HYDROLANT 2043/22 · Other2022-08-16 → 2022-08-17
    Salvage and pollution response operations in progress until further notice by M/V willchallenge, M/V sartor,…
  16. HYDROLANT 2019/22 · Other2022-08-14 → 2022-08-16
    Salvage and pollution response operations in progress until further notice by M/V willchallenge, M/V sartor,…
  17. HYDROLANT 1997/22 · Surveys2022-08-12 → 2022-09-04
    Survey operations 14 aug until further notice by M/V ramform vanguard towing 14 5025 meter long cables in…
  18. HYDROLANT 1996/22 · Surveys2022-08-12 → 2022-08-12
    Survey operations 14 aug until further notice by M/V ramform vanguard towing 14 5025 meter long cables in…
  19. HYDROLANT 1994/22 · Surveys2022-08-11 → 2022-09-03
    Survey operations in progress until further notice by M/V sanco atlantic towing 12 150 meter long cables in…
  20. HYDROLANT 1987/22 · Surveys2022-08-10 → 2022-08-25
    Survey operations in progress until further notice by M/V amazon warrior towing 8 3100 meter long cables in…

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