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 2865/19 · Surveys2019-09-19 → 2019-10-29
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 5.4 mile long cables in…
  2. HYDROLANT 2831/19 · Other2019-09-17 → 2019-09-17
    All navigational aids at race bank windfarm 53-16N 000-50E unreliable
  3. HYDROLANT 2819/19 · Nav aids2019-09-16 → 2019-10-28
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  4. HYDROLANT 2781/19 · Nav aids2019-09-12 → 2019-10-24
    All navigational aids at leman gas platform 49/27 53-03.7N 002-12.7E inoperative
  5. HYDROLANT 2774/19 · Surveys2019-09-12 → 2019-09-26
    Survey operations in progress until further notice by M/V sw tasman, M/V sw cook and M/V sw emerald in area…
  6. HYDROLANT 2773/19 · Surveys2019-09-12 → 2019-10-16
    Survey operations in progress until further notice by M/V veritas viking and M/V artemis athene in area…
  7. HYDROLANT 2767/19 · Derelicts2019-09-11 → 2019-09-14
    Derelict vessel adrift in vicinity 57-30N 003-08E at 110600Z sep
  8. HYDROLANT 2766/19 · Surveys2019-09-11 → 2019-09-12
    Survey operations in progress until further notice by M/V sw tasman, M/V sw cook and M/V sw emerald in area…
  9. HYDROLANT 2719/19 · Cable ops2019-09-05 → 2019-09-10
    Underwater operations in progress until further notice by cableship sovereign in vicinity of 52-28.4N…
  10. HYDROLANT 2667/19 · Nav aids2019-08-31 → 2019-09-01
    Auskerry light 59-01.5N 002-34.3W unreliable
  11. HYDROLANT 2638/19 · Surveys2019-08-30 → 2019-09-11
    Survey operations in progress until 300700Z sep by M/V sw tasman and M/V sw cook in area bound by 56-20N…
  12. HYDROLANT 2625/19 · Nav aids2019-08-29 → 2019-10-18
    All navigational aids at wenlock platform, 53-35.3N 002-17.7E inoperative
  13. HYDROLANT 2605/19 · Surveys2019-08-27 → 2019-09-26
    Survey operations in progress until further notice by M/V sw amundsen towing eight 4000 meter long cables in…
  14. HYDROLANT 2566/19 · Nav aids2019-08-23 → 2019-08-27
    Kinnairds head light 57-41.9N 002-00.2W unreliable
  15. HYDROLANT 2545/19 · Surveys2019-08-20 → 2019-09-12
    Survey operations in progress until further notice by M/V veritas viking and M/V artemis athene in area…
  16. HYDROLANT 2510/19 · Nav aids2019-08-17 → 2019-09-02
    Bessemer gas platform 53-11.9N 002-29.1E unlit
  17. HYDROLANT 2489/19 · Nav aids2019-08-15 → 2019-10-04
    All navigational aids at tethys platform 53-39.1N 002-03.5E inoperative
  18. HYDROLANT 2484/19 · Nav aids2019-08-15 → 2019-09-24
    Platform 49/21-PTD 53-19.0N 002-05.7E unlit
  19. HYDROLANT 2482/19 · Nav aids2019-08-15 → 2019-09-18
    All navigational aids at platform 48/12A 53-32.8N 001-21.6E inoperative
  20. HYDROLANT 2453/19 · Surveys2019-08-12 → 2019-08-29
    Survey operations in progress until 260200Z sep by M/V sw tasman and M/V sw cook area bound by 59-25N…

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