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 1734/22 · Surveys2022-07-09 → 2022-07-18
    Underwater operations in progress until further notice by M/V uilenspiegel in vicinity of trackline joining…
  2. HYDROLANT 1728/22 · Nav aids2022-07-08 → 2022-08-19
    Platform 44/21A, 54-14.60N 002-09.20E unlit and all navigational aids inoperative
  3. HYDROLANT 1673/22 · Missiles2022-07-02 → 2022-07-07
    Hazardous operations, rocket launching 1000Z to 1330Z daily 06 and 07 jul in area bound by 60-51.00N…
  4. HYDROLANT 1626/22 · Other2022-06-25 → 2022-06-28
    Three 70 meter long hoses adrift in vicinity 58-48.00N 001-21.00E at 251831Z jun
  5. HYDROLANT 1622/22 · Surveys2022-06-25 → 2022-08-06
    Survey operations in progress until further notice by M/V sanco star and M/V olympic taurus in area bound by…
  6. HYDROLANT 1620/22 · Nav aids2022-06-25 → 2022-07-07
    All navigational aids at platform 49/27-G 53-02.20N 002-22.90E inoperative
  7. HYDROLANT 1617/22 · Wrecks2022-06-24 → 2022-08-05
    Dangerous wreck, least depth 15.6 meters, in 54-40.10N 002-26.80E
  8. HYDROLANT 1610/22 · Surveys2022-06-24 → 2022-06-25
    Survey operations 25 jun thru 05 aug by M/V sanco star and M/V olympic taurus in area bound by 57-20.65N…
  9. HYDROLANT 1558/22 · Surveys2022-06-18 → 2022-06-19
    Underwater operations in progress until further notice by M/V ile de molene in vicinity 56-43.00N 005-59.00E
  10. HYDROLANT 1546/22 · Nav aids2022-06-16 → 2022-07-28
    Star point light 59-16.60N 002-22.60W range temporarily reduced to 12 miles
  11. HYDROLANT 1533/22 · Surveys2022-06-15 → 2022-07-03
    Survey operations in progress until further notice by M/V ramform hyperion towing 12 4000 meter long cables…
  12. HYDROLANT 1501/22 · Wrecks2022-06-10 → 2022-07-22
    Dangerous wreck, least depth 19.3 meters, in 56-38.80N 002-26.20W
  13. HYDROLANT 1486/22 · Nav aids2022-06-09 → 2023-07-14
    All navigational aids at platform 49/26-G 53-07.1N 002-06.2E inoperative
  14. HYDROLANT 1474/22 · Surveys2022-06-07 → 2022-09-20
    Survey operations in progress until further notice by M/V sw vespucci, M/V sw cook and M/V sw tasman in area…
  15. HYDROLANT 1377/22 · Nav aids2022-05-25 → 2022-05-27
    NAVTEX station cullercoats (g) 55-04.00N 001-28.00W off air 0800Z to 1600Z daily 26 and 27 may
  16. HYDROLANT 1282/22 · Nav aids2022-05-14 → 2022-06-25
    All navigational aids at platform 49/27-G 53-02.20N 002-22.90E inoperative
  17. HYDROLANT 1272/22 · Surveys2022-05-12 → 2022-05-20
    Survey operations in progress until further notice by M/V amazon conqueror towing 7400 meter long cables in…
  18. HYDROLANT 1264/22 · Surveys2022-05-11 → 2022-06-10
    Underwater operations in progress until further notice by M/V havila phoenix in vicinity of trackline…
  19. HYDROLANT 1235/22 · Surveys2022-05-07 → 2022-08-10
    Survey operations in progress until further notice by M/V amazon warrior towing 14 8400 meter long cables in…
  20. HYDROLANT 1233/22 · Surveys2022-05-07 → 2022-05-07
    Survey operations in progress until further notice by M/V amazon warrior and M/V amazon conqueror towing 14…

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