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 1984/19 · Nav aids2019-07-01 → 2019-07-30
    All navigational aids at platform 49/26-CP 53-05.8N 002-09.7E inoperative
  2. HYDROLANT 1899/19 · Other2019-06-25 → 2019-08-06
    All navigational aids at race bank windfarm 53-16N 000-50E unreliable
  3. HYDROLANT 1883/19 · Nav aids2019-06-24 → 2019-08-05
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  4. HYDROLANT 1882/19 · Nav aids2019-06-24 → 2019-06-24
    Stirling dgps station 56-04N 004-04W off air 241000Z to 241300Z jun
  5. HYDROLANT 1871/19 · Nav aids2019-06-22 → 2019-06-22
    Foxtrot 3 lightship 51-23.8N 002-00.6E unlit
  6. HYDROLANT 1864/19 · Wrecks2019-06-21 → 2019-08-23
    Depths reported: a. 27.9 meters in 51-09.30N 001-44.43E
  7. HYDROLANT 1824/19 · Other2019-06-18 → 2019-07-31
    DNC20
  8. HYDROLANT 1813/19 · Nav aids2019-06-16 → 2019-06-18
    Kinnairds head light 57-41.9N 002-00.2W unlit
  9. HYDROLANT 1804/19 · Cable ops2019-06-15 → 2019-06-18
    Underwater operations in progress until further notice by cableship ile d'aix in vicinity of trackline…
  10. HYDROLANT 1786/19 · Wrecks2019-06-14 → 2019-06-21
    Depths reported less than charted: a. 27.9 meters in 51-09.30N 001-44.43E
  11. HYDROLANT 1768/19 · Cable ops2019-06-11 → 2019-06-15
    Underwater operations in progress until further notice by cableship ile d'aix in vicinity of trackline…
  12. HYDROLANT 1749/19 · Cable ops2019-06-09 → 2019-06-11
    Underwater operations in progress until further notice by cableship ile d'aix in vicinity of trackline…
  13. HYDROLANT 1737/19 · Cable ops2019-06-07 → 2019-06-09
    Underwater operations in progress until further notice by cableship ile d'aix in vicinity of trackline…
  14. HYDROLANT 1726/19 · Cable ops2019-06-06 → 2019-06-07
    Underwater operations in progress until further notice by cableship ile d'aix in vicinity of trackline…
  15. HYDROLANT 1717/19 · Nav aids2019-06-05 → 2019-07-17
    All navigational aids at wenlock platform, 53-35.3N 002-17.7E inoperative
  16. HYDROLANT 1716/19 · Nav aids2019-06-05 → 2019-07-17
    Cgoc aberdeen mf dsc services at greg ness site 57-08.3N 002-02.9W unreliable
  17. HYDROLANT 1709/19 · Other2019-06-04 → 2019-06-18
    Unexploded ordnance in vicinity of line joining 53-31.2N 000-14.9E, 53-29.4N 000-19.1E
  18. HYDROLANT 1704/19 · Nav aids2019-06-04 → 2019-06-06
    Dgps station at flamborough head light 54-07N 000-05W off air 0800Z to 1600Z daily 04 thru 06 jun
  19. HYDROLANT 1681/19 · Nav aids2019-06-01 → 2019-06-15
    Cgoc aberdeen dsc service at windy head 57-38.9N 002-14.6W off air
  20. HYDROLANT 1673/19 · Surveys2019-05-31 → 2019-06-26
    Underwater operations in progress until further notice by M/V fpv flintstone in vicinity of trackline…

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