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 269/22 · Surveys2022-01-28 → 2022-02-23
    Survey operations in progress until further notice by M/V northern franklin in vicinity of trackline joining…
  2. HYDROLANT 263/22 · Nav aids2022-01-28 → 2022-01-28
    RACON at girdle ness light 57-08.3N 002-02.9W off air 280900Z to 281600Z jan
  3. HYDROLANT 213/22 · Nav aids2022-01-23 → 2022-01-23
    Skroo light 59-33.1N 001-36.6W unreliable
  4. HYDROLANT 166/22 · Nav aids2022-01-18 → 2022-01-19
    England DNC 01
  5. HYDROLANT 150/22 · Nav aids2022-01-17 → 2022-01-17
    Stirling dgps station 56-04N 004-04W unreliable
  6. HYDROLANT 144/22 · Nav aids2022-01-16 → 2022-01-17
    All navigational aids at southwark platform 53-11.0N 002-05.8E inoperative
  7. HYDROLANT 137/22 · Surveys2022-01-15 → 2022-01-23
    Survey operations in progress until further notice by M/V northern franklin in vicinity of trackline joining…
  8. HYDROLANT 70/22 · Nav aids2022-01-07 → 2022-01-10
    Fog signal at platform 49/26-G 53-07.0N 002-06.2E inoperative
  9. HYDROLANT 33/22 · Nav aids2022-01-04 → 2022-01-10
    All navigational aids at shamrock platform 53-28.2N 002-55.2E inoperative
  10. HYDROLANT 26/22 · Nav aids2022-01-03 → 2022-01-04
    All navigational aids at platform 49/27-H 53-00.2N 002-12.8E inoperative
  11. HYDROLANT 3203/21 · Nav aids2021-12-30 → 2022-01-14
    Outer sand buoy 53-36.4N 000-29.6E unlit
  12. HYDROLANT 3193/21 · Nav aids2021-12-29 → 2021-12-31
    All navigational aids at platform 449/18-AP, ad, 53-21.8N 002-34.1E inoperative
  13. HYDROLANT 3192/21 · Other2021-12-29 → 2022-01-03
    All navigational aids inoperative at platform 49/27-J 53-02.0N 002-13.1E
  14. HYDROLANT 3187/21 · Nav aids2021-12-29 → 2022-02-08
    Fog signal at platform 48/29-B 53-03.2N 001-41.1E inoperative
  15. HYDROLANT 3180/21 · Nav aids2021-12-28 → 2022-01-07
    All navigational aids at platform 15/17-A, 58-25N 000-20E inoperative
  16. HYDROLANT 3176/21 · Nav aids2021-12-28 → 2021-12-28
    All navigational aids at platform 15/17-A, 58-25N 000-20E inoperative
  17. HYDROLANT 3173/21 · Other2021-12-28 → 2021-12-29
    All navigational aids inoperative at platforms: a. 49/27-J 53-02.0N 002-13.1E
  18. HYDROLANT 3172/21 · Nav aids2021-12-28 → 2022-01-16
    All navigational aids at platform 49/14-QA, 53-34.7N 002-47.5E inoperative
  19. HYDROLANT 3167/21 · Other2021-12-26 → 2022-01-24
    All navigational aids at platforms inoperative
  20. HYDROLANT 3162/21 · Nav aids2021-12-26 → 2021-12-28
    All navigational aids at platform 49/27-J 53-02.0N 002-13.1E inoperative

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