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 2357/17 · Nav aids2017-07-31 → 2017-09-03
    All navigational aids at platform 48/17A-LA, 53-24.6N 001-22.5E inoperative
  2. HYDROLANT 2355/17 · Other2017-07-31 → 2017-07-31
    Two pipes adrift in: a. 52-47.16N 002-54.37E at 301758Z jul
  3. HYDROLANT 2353/17 · Other2017-07-30 → 2017-07-31
    30 meter long pipe adrift in 52-41.4N 002-03.2E at 301737Z jul
  4. HYDROLANT 2352/17 · Other2017-07-30 → 2017-08-02
    30 meter long pipe adrift in 52-48.9N 002-02.7E at 301215Z jul 17
  5. HYDROLANT 2351/17 · Other2017-07-30 → 2017-07-31
    Two pipes adrift at 301816Z jul in: a. 52-46.31N 002-54.47E
  6. HYDROLANT 2345/17 · Other2017-07-29 → 2017-07-30
    Two pipes adrift at 291816Z jul in: a. 52-56.10N 003-11.41E
  7. HYDROLANT 2343/17 · Other2017-07-29 → 2017-07-29
    Two pipes adrift at 291335Z jul in: a. 52-51.55N 003-11.40E
  8. HYDROLANT 2342/17 · Other2017-07-29 → 2017-07-29
    Two pipes adrift in 52-46.01N 002-54.25E at 291007Z jul
  9. HYDROLANT 2341/17 · Other2017-07-29 → 2017-07-29
    Two pipes adrift in 52-33.8N 002-50.1E at 290143Z jul
  10. HYDROLANT 2333/17 · Nav aids2017-07-28 → 2017-07-31
    All navigational aids at platform 49/16, 53-23.2N 002-08.9E inoperative
  11. HYDROLANT 2295/17 · Wrecks2017-07-24 → 2017-07-29
    All navaids on east side of sheringham shoal windfarm (53-08N 001-09E) inoperative
  12. HYDROLANT 2254/17 · Nav aids2017-07-20 → 2017-08-31
    Cgoc humber mf dsc and r/t services at cullercoats 55-01N 001-25W unreliable
  13. HYDROLANT 2243/17 · Nav aids2017-07-19 → 2017-08-30
    Fog signal at platform 9/13-SPM3, 59-32.0N 001-33.5E inoperative
  14. HYDROLANT 2241/17 · Cable ops2017-07-19 → 2017-07-26
    Cable operations in progress until further notice by M/V havila subsea in vicinity of trackline joining…
  15. HYDROLANT 2240/17 · Other2017-07-19 → 2017-08-02
    Unexploded ordnance in: a. 53-53.05N 001-39.55E
  16. HYDROLANT 2239/17 · Surveys2017-07-19 → 2017-07-26
    Underwater operations in progress until further notice by M/V rambiz 3000 in 53-05.0N 002-32.7E
  17. HYDROLANT 2231/17 · Nav aids2017-07-18 → 2017-08-29
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  18. HYDROLANT 2218/17 · Other2017-07-17 → 2017-07-20
    Yellow buoy and cable adrift in 59-37N 002-46E at 170200Z jul
  19. HYDROLANT 2143/17 · Nav aids2017-07-11 → 2017-07-11
    Hoo stack light 60-15.0N 001-05.4W unlit
  20. HYDROLANT 2120/17 · Other2017-07-08 → 2017-08-19
    Unexploded ordnance in 51-19.31N 001-56.12E

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