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 3519/19 · Nav aids2019-11-17 → 2019-11-20
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W unreliable
  2. HYDROLANT 3489/19 · Nav aids2019-11-14 → 2019-11-14
    Auskerry light 59-01-32N 002-34-19W unreliable
  3. HYDROLANT 3488/19 · Nav aids2019-11-14 → 2019-11-14
    Flamborough head light 54-06-58N 000-04-57W unreliable
  4. HYDROLANT 3479/19 · Nav aids2019-11-13 → 2019-11-13
    Auskerry light 59-01.5N 002-34.3W unreliable
  5. HYDROLANT 3404/19 · Other2019-11-05 → 2019-12-18
    Unexploded ordnance reported marked by reflector in 52-31.57N 002-56.74E
  6. HYDROLANT 3334/19 · Nav aids2019-10-31 → 2019-11-30
    Fog signals inoperative at platforms: a. 49/27G, 53-02.2N 002-23.0E
  7. HYDROLANT 3292/19 · Nav aids2019-10-28 → 2019-12-09
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  8. HYDROLANT 3137/19 · Other2019-10-14 → 2022-01-14
    Unexploded ordnance in 52-42.63N 003-04.36E
  9. HYDROLANT 3118/19 · Surveys2019-10-13 → 2019-10-18
    Survey operations in progress until futher notice by M/V sw amundsen towing seven 4000 meter long cables in…
  10. HYDROLANT 3117/19 · Nav aids2019-10-12 → 2019-10-13
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W unreliable
  11. HYDROLANT 3088/19 · Surveys2019-10-11 → 2019-10-27
    Survey operations in progress until 26 oct by M/V sw tasman and M/V sw cook in area bound by 59-31N 001-42E,…
  12. HYDROLANT 3085/19 · Surveys2019-10-11 → 2019-10-19
    Survey operations in progress until 24 oct by M/V sanco sword and M/V havila aurora towing 300 meter long…
  13. HYDROLANT 3002/19 · Nav aids2019-10-02 → 2019-10-10
    RACON at rattray head light 57-36-36N 001-49-00W inoperative
  14. HYDROLANT 2978/19 · Cable ops2019-09-28 → 2019-09-30
    Underwater operations in progress until further notice by cableship ile d'aix in area within two miles of…
  15. HYDROLANT 2942/19 · Cable ops2019-09-27 → 2019-11-06
    Cable operations in progress until further notice by cableship sovereign in vicinity of 52-28.4N 002-51.6E
  16. HYDROLANT 2938/19 · Surveys2019-09-26 → 2019-10-05
    Survey operations in progress until further notice by M/V sw tasman and M/V sw emerald in area bound by…
  17. HYDROLANT 2937/19 · Surveys2019-09-26 → 2019-10-13
    Survey operations in progress until futher notice by M/V sw amundsen and M/V sw cook towing eight 4000 meter…
  18. HYDROLANT 2926/19 · Wrecks2019-09-25 → 2020-07-10
    Dangerous wreck in 55-03.1N 001-23.8W
  19. HYDROLANT 2921/19 · Nav aids2019-09-25 → 2019-09-25
    Dgps station at north foreland light 51-22.5N 001-26.7E off air 250800Z to 251600Z sep
  20. HYDROLANT 2900/19 · Cable ops2019-09-23 → 2019-09-26
    Cable operations in progress until further notice by cableship ile de batz in area within 2 miles of…

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