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 358/19 · Other2019-02-03 → 2019-02-07
    Unexploded ordnance in 56-11.64N 002-42.28W
  2. HYDROLANT 344/19 · Nav aids2019-02-02 → 2019-02-18
    Cgoc aberdeen mf dsc and dgps services at greg ness site 57-08.3N 002-02.9W off air
  3. HYDROLANT 312/19 · Wrecks2019-01-30 → 2019-02-04
    Depths reported: a. 13.7 meters in 52-49.64N 002-04.92E
  4. HYDROLANT 297/19 · Debris2019-01-29 → 2019-02-01
    100 ten meter long timbers adrift in 52-27.5N 002-46.5E at 272330Z jan
  5. HYDROLANT 276/19 · Nav aids2019-01-27 → 2019-01-29
    Dgps station at flamborough head light 54-07N 000-05W off air
  6. HYDROLANT 272/19 · Other2019-01-27 → 2019-03-10
    Unexploded ordnance in 52-18.32N 002-15.07E
  7. HYDROLANT 262/19 · Nav aids2019-01-25 → 2019-02-05
    All navigational aids of turbine in 57-29.1N 001-22.3W at buchan deep windfarm inoperative
  8. HYDROLANT 240/19 · Nav aids2019-01-24 → 2019-08-03
    Kinnairds head light 57-41.9N 002-00.2W, range reduced to 12 miles
  9. HYDROLANT 233/19 · Nav aids2019-01-24 → 2019-03-07
    Main navigational lights at bessemer gas platform, 53-11.9N 002-29.1E inoperative
  10. HYDROLANT 228/19 · Cable ops2019-01-23 → 2019-01-25
    Underwater operations in progress until further notice by cableship maersk connector in vicinity of…
  11. HYDROLANT 199/19 · Wrecks2019-01-21 → 2019-03-04
    Dangerous wreck, least depth 26.6 meters, in 52-56.6N 001-54.4E
  12. HYDROLANT 186/19 · Wrecks2019-01-21 → 2019-01-30
    13.7 meter depth reported in 52-49.64N 002-04.92E
  13. HYDROLANT 182/19 · Nav aids2019-01-20 → 2019-01-21
    Dgps station at sumburgh head light 59-51.2N 001-16.5W off air
  14. HYDROLANT 147/19 · Cable ops2019-01-17 → 2019-01-23
    Underwater operations in progress until further notice by cableship maersk connector in vicinity of…
  15. HYDROLANT 122/19 · Other2019-01-15 → 2019-03-04
    All navigational aids at race bank windfarm 53-20.05N 000-46.58E inoperative
  16. HYDROLANT 101/19 · Surveys2019-01-11 → 2019-01-16
    Underwater operations in progress until further notice by M/V maersk connector in vicinity of trackline…
  17. HYDROLANT 88/19 · Nav aids2019-01-10 → 2019-03-01
    Fog signal and lights at anglia gas platform 53-22.1N 001-39.2E inoperative
  18. HYDROLANT 81/19 · Wrecks2019-01-09 → 2019-02-20
    Foul ground reported in 57-11.9N 001-58.2W
  19. HYDROLANT 74/19 · Nav aids2019-01-08 → 2019-02-06
    Dudgeon windfarm turbine 53-18.06N 001-22.26E unlit
  20. HYDROLANT 69/19 · Nav aids2019-01-07 → 2019-02-18
    Cgoc humber mf dsc and r/t services at langham 52-56.5N 000-57.2E off air

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