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 2453/17 · Surveys2017-08-09 → 2017-08-14
    Survey operations in progress until further notice by M/V geosurveyor XI in vicinity of trackline between…
  2. HYDROLANT 2430/17 · Wrecks2017-08-06 → 2017-10-14
    Dangerous wreck in 52-25.2N 001-49.7E marked by buoy, RACON (d) to north
  3. HYDROLANT 2427/17 · Nav aids2017-08-06 → 2017-08-07
    Auskerry light 59-01.5N 002-34.3W unreliable
  4. HYDROLANT 2424/17 · Nav aids2017-08-05 → 2017-08-07
    England DNC 20
  5. HYDROLANT 2423/17 · Wrecks2017-08-05 → 2017-08-06
    Dangerous wreck marked by lighted buoys in 51-40.20N 002-13.58E
  6. HYDROLANT 2421/17 · Surveys2017-08-05 → 2017-08-07
    Underwater operations in progress until further notice by M/V rambiz 3000 in vicinity of 53-05.0N 002-32.7E
  7. HYDROLANT 2419/17 · Cable ops2017-08-05 → 2017-08-15
    Underwater operations in progress until further notice by cableship wave sentinel with submersible in…
  8. HYDROLANT 2418/17 · Nav aids2017-08-05 → 2017-08-05
    Foxtrot 3 lightship 51-23.8N 002-00.6E unreliable
  9. HYDROLANT 2415/17 · Other2017-08-04 → 2017-08-07
    450 meter partially submerged pipe adrift in 53-08.83N 002-59.09E at 041105Z aug
  10. HYDROLANT 2414/17 · Other2017-08-04 → 2017-08-07
    450 meter partially submerged pipe adrift in 53-02.02N 002-06.55E at 040840Z aug
  11. HYDROLANT 2397/17 · Other2017-08-03 → 2017-08-06
    100 meter long pipe adrift in 52-54.5N 002-03.1E at 030650Z aug
  12. HYDROLANT 2394/17 · Other2017-08-02 → 2017-09-13
    Unexploded ordnance in 53-53.05N 001-39.55E
  13. HYDROLANT 2392/17 · Other2017-08-02 → 2017-08-03
    Pipe adrift in 52-53.54N 002-50.76E at 021710Z aug
  14. HYDROLANT 2376/17 · Other2017-08-01 → 2017-08-04
    Pipes adrift in: a. 52-52.77N 002-56.87E at 310930Z aug
  15. HYDROLANT 2373/17 · Cable ops2017-08-01 → 2017-08-28
    Underwater operations in progress until further notice by cableship sovereign in vicinity 54-34.2N 002-17.4E
  16. HYDROLANT 2369/17 · Nav aids2017-07-31 → 2017-08-01
    Meteorological mast 56-26.4N 002-14.5W unlit
  17. HYDROLANT 2368/17 · Surveys2017-07-31 → 2017-08-02
    Underwater operations in progress until further notice by M/V rambiz 3000 in vicinity 53-05.0N 002-32.7E
  18. HYDROLANT 2365/17 · Nav aids2017-07-31 → 2017-08-02
    All navigational aids at platform 49/16, 53-23.2N 002-09.0E inoperative
  19. HYDROLANT 2364/17 · Other2017-07-31 → 2017-08-01
    Pipe adrift in 52-52.77N 002-56.87E at 310930Z jul
  20. HYDROLANT 2363/17 · Other2017-07-31 → 2017-08-01
    30 meter long pipe adrift in 52-41.6N 002-02.4E at 311120Z jul

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