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. NAVAREA XII 493/21 · Other2021-09-12 → 2021-09-30
    Commdet kodiak, ak remote sites 4125 khz receive services inoperative: a. saint paul 57-10.6N 170-16.6W
  2. HYDROLANT 2306/21 · Nav aids2021-09-11 → 2021-09-11
    All navigational aids at platform 49/27-J 53-02.0N 002-13.2E inoperative
  3. HYDROLANT 2305/21 · Nav aids2021-09-11 → 2022-01-07
    Sunk centre lightfloat 51-50.1N 001-46.0E permanently replaced by safe water buoy, mo(a) 15 sec, RACON (c),…
  4. HYDROLANT 2288/21 · Nav aids2021-09-09 → 2021-10-21
    All navigational aids at platform goldeneye 14/29-A 58-00.1N 000-22.9W inoperative
  5. HYDROLANT 2280/21 · Other2021-09-07 → 2021-09-11
    All navigational aids inoperative: a. platform north 43/26-ST2 54-03.2N 001-02.0E
  6. HYDROLANT 2268/21 · Cable ops2021-09-05 → 2021-10-17
    Cable operations in progress until further notice by M/V sar fame in vicinity of trackline joining 52-29.7N…
  7. HYDROLANT 2263/21 · Cable ops2021-09-03 → 2021-09-05
    Cable operations in progress until further notice by M/V sar fame in vicinity of trackline joining 52-29.7N…
  8. NAVAREA XII 466/21 · Other2021-09-03 → 2021-09-03
    Commdet kodiak, ak remote sites 4125KHZ receive inoperative: a. saint paul 57-10.6N 170-16.6W
  9. NAVAREA XII 463/21 · Other2021-09-02 → 2021-09-03
    Commdet kodiak, ak remote sites 4125 khz services unreliable: a. nome 64-30.0N 165-24.6W
  10. HYDROLANT 2228/21 · Other2021-08-30 → 2021-09-03
    All navigational aids at aberdeen offshore windfarm 57-13.4N 001-59.7W unreliable until 031300Z sep
  11. HYDROLANT 2213/21 · Nav aids2021-08-29 → 2021-10-10
    All navigational aids at shamrock platform 53-28.2N 002-55.2E inoperative
  12. HYDROLANT 2194/21 · Nav aids2021-08-26 → 2022-03-25
    Skadan light 59-30.8N 001-39.2W range reduced to 12 miles
  13. HYDROLANT 2186/21 · Other2021-08-25 → 2021-10-06
    Unexploded ordnance reported in 52-34.2N 002-10.8E
  14. HYDROLANT 2177/21 · Nav aids2021-08-24 → 2021-09-17
    All navigational aids at platform 49/27-H 53-00.3N 002-12.9E inoperative
  15. HYDROLANT 2176/21 · Surveys2021-08-24 → 2021-10-21
    Survey operations in progress until further notice by M/V ramform hyperion towing ten 2800 meter long cables…
  16. HYDROLANT 2124/21 · Nav aids2021-08-18 → 2021-09-02
    All navigational aids at platform 48/29-B 53-03.2N 001-41.1E inoperative
  17. HYDROLANT 2112/21 · Surveys2021-08-16 → 2021-09-28
    Survey operations in progress until further notice by M/V fugro galaxy in area bound by 52-21.3N 001-44.4E,…
  18. HYDROLANT 2098/21 · Nav aids2021-08-12 → 2021-08-16
    Cromer light 52-55.5N 001-19.0E unreliable
  19. HYDROLANT 2082/21 · Nav aids2021-08-10 → 2021-08-13
    All navigational aids at wenlock platform, 53-35.3N 002-17.6E inoperative
  20. HYDROLANT 2058/21 · Cable ops2021-08-07 → 2021-08-31
    Cable operations in progress until further notice by M/V havila phoenix along trackline joining 52-30.0N…

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