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 1763/21 · Surveys2021-07-05 → 2021-07-13
    Survey operations in progress until 12 jul by M/V fugro frontier, M/V fugro venturer and M/V fugro searcher…
  2. HYDROLANT 1752/21 · Surveys2021-07-04 → 2021-07-07
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter cable in…
  3. HYDROLANT 1751/21 · Surveys2021-07-03 → 2021-07-08
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 10500 meter long cables…
  4. HYDROLANT 1748/21 · Derelicts2021-07-03 → 2021-07-06
    Derelict vessel submerged and adrift in vicinity 58-09.4N 003-31.5W at 030459Z jul
  5. HYDROLANT 1737/21 · Nav aids2021-07-02 → 2021-07-31
    All navigational aids at platform 49/27-J 53-02.0N 002-13.2E inoperative
  6. HYDROLANT 1731/21 · Surveys2021-07-01 → 2021-07-04
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter cable in…
  7. HYDROLANT 1727/21 · Nav aids2021-07-01 → 2021-07-01
    Muckle holm light 60-34.8N 001-16.0W unlit
  8. HYDROLANT 1707/21 · Surveys2021-06-28 → 2021-06-30
    Survey operations in prrogress until further notice by M/V academic lazarev towing 13000 meter long cable…
  9. HYDROLANT 1691/21 · Surveys2021-06-25 → 2021-06-27
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  10. HYDROLANT 1656/21 · Nav aids2021-06-21 → 2021-06-23
    RACON at inter bank buoy 51-16.5N 001-52.2E inoperative
  11. HYDROLANT 1652/21 · Nav aids2021-06-21 → 2021-08-02
    Swilkie point light 58-41.8N 003-07.0W range reduced to 12 miles
  12. HYDROLANT 1650/21 · Surveys2021-06-21 → 2021-06-25
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  13. HYDROLANT 1648/21 · Surveys2021-06-21 → 2021-10-11
    Survey operations in progress until further notice by M/V oceanic vega towing ten 7200 meter long cables in…
  14. HYDROLANT 1630/21 · Nav aids2021-06-18 → 2021-06-25
    Platform 48/29-B 53-03.2N 001-41.1E unlit
  15. HYDROLANT 1625/21 · Surveys2021-06-17 → 2021-06-21
    Survey operations 18 jun until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  16. HYDROLANT 1603/21 · Surveys2021-06-15 → 2021-06-17
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  17. HYDROLANT 1592/21 · Surveys2021-06-14 → 2021-06-21
    Survey operations in progress until further notice by M/V oceanic vega towing ten 7200 meter long cables in…
  18. HYDROLANT 1579/21 · Surveys2021-06-12 → 2021-06-15
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  19. HYDROLANT 1575/21 · Nav aids2021-06-12 → 2021-06-23
    Cgoc shetland mf dsc and r/t services at st margarets hope site 58-49.3N 002-57.4W off air
  20. HYDROLANT 1565/21 · Nav aids2021-06-11 → 2021-06-16
    Copinsay light 58-53.8N 002-40.3W unreliable

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