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 2440/19 · Nav aids2019-08-10 → 2019-08-15
    All navigational aids at tethys platform 53-39.1N 002-03.5E inoperative
  2. HYDROLANT 2436/19 · Surveys2019-08-09 → 2019-08-20
    Survey operations in progress until further notice by M/V veritas viking and M/V artemis athene in area…
  3. HYDROLANT 2408/19 · Other2019-08-06 → 2019-09-17
    All navigational aids at race bank windfarm 53-16N 000-50E unreliable
  4. HYDROLANT 2407/19 · Surveys2019-08-06 → 2019-08-30
    Underwater operations until further notice by M/V deep helder in vicinity of trackline joining 51-09.0N…
  5. HYDROLANT 2399/19 · Nav aids2019-08-06 → 2019-08-08
    Dgps station at sumburgh head light 59-51.2N 001-16.5W off air 0800Z to 1600Z daily 07 and 08 aug
  6. HYDROLANT 2394/19 · Surveys2019-08-05 → 2019-08-09
    Survey operations in progress until further notice by M/V veritas viking in area bound by 60-33.8N…
  7. HYDROLANT 2391/19 · Nav aids2019-08-05 → 2019-09-16
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  8. HYDROLANT 2386/19 · Surveys2019-08-03 → 2019-08-23
    Survey operations in progress until further notice by M/V polar empress in area bound by 55-15.6N 000-26.6W,…
  9. HYDROLANT 2296/19 · Nav aids2019-07-26 → 2019-10-04
    Fog signal at platform jacky, 58-11.0N 002-58.8W inoperative
  10. HYDROLANT 2260/19 · Surveys2019-07-25 → 2019-08-05
    Survey operations in progress until further notice by M/V artemis athene and S/V veritas viking in area…
  11. HYDROLANT 2215/19 · Nav aids2019-07-20 → 2019-07-22
    Dgps station at north foreland light 51-22.5N 001-26.7E off air
  12. HYDROLANT 2211/19 · Surveys2019-07-20 → 2019-08-22
    Survey operations in progress until 21 aug by M/V amazon conqueror towing 15 5000 meter long cables in area…
  13. HYDROLANT 2172/19 · Nav aids2019-07-17 → 2019-08-29
    All navigational aids at wenlock platform, 53-35.3N 002-17.7E inoperative
  14. HYDROLANT 2171/19 · Nav aids2019-07-17 → 2019-08-16
    Cgoc aberdeen mf dsc services at greg ness site 57-08.3N 002-02.9W unreliable
  15. HYDROLANT 2149/19 · Nav aids2019-07-16 → 2019-07-18
    Dgps station at north foreland light 51-22.5N 001-26.7E off air 0800Z to 1600Z daily 16 thru 18 jul
  16. HYDROLANT 2100/19 · Other2019-07-12 → 2019-07-31
    All navigational aids inoperative at platforms: a. 11/30-C, 58-05.7N 003-09.1W
  17. HYDROLANT 2083/19 · Wrecks2019-07-10 → 2019-08-23
    Dangerous wreck in 51-27.07N 001-33.33E
  18. HYDROLANT 2050/19 · Nav aids2019-07-06 → 2019-08-17
    Bessemer gas platform 53-11.9N 002-29.1E unlit
  19. HYDROLANT 2038/19 · Wrecks2019-07-05 → 2019-08-03
    Depths reported: a. 28.1 meters in 51-21.74N 001-53.74E
  20. HYDROLANT 2004/19 · Surveys2019-07-03 → 2019-10-08
    Survey operations in progress until 01 nov by M/V sanco sword towing 300 meter long cables in area bound by…

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