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 1560/21 · Surveys2021-06-10 → 2021-07-03
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 10500 meter long cables…
  2. HYDROLANT 1542/21 · Surveys2021-06-09 → 2021-06-12
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  3. HYDROLANT 1541/21 · Nav aids2021-06-08 → 2021-06-11
    Cromer light 52-55.5N 001-19.0E unreliable
  4. HYDROLANT 1533/21 · Nav aids2021-06-08 → 2021-06-08
    Cromer light 52-55.5N 001-19.0E unreliable
  5. HYDROLANT 1531/21 · Wrecks2021-06-07 → 2021-06-15
    Dangerous obstructions, least depth 12 meters, in area within one mile of 56-18.15N 002-12.95W
  6. HYDROLANT 1520/21 · Nav aids2021-06-07 → 2021-06-07
    Cromer light 52-55.5N 001-19.0E unreliable
  7. HYDROLANT 1518/21 · Nav aids2021-06-06 → 2021-07-18
    All navigational aids at shamrock platform 53-28.2N 002-55.2E inoperative
  8. HYDROLANT 1515/21 · Surveys2021-06-06 → 2021-06-10
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 10500 meter long cables…
  9. HYDROLANT 1504/21 · Nav aids2021-06-05 → 2021-06-06
    Sandettie sw buoy 51-09.7N 001-45.6E unlit
  10. HYDROLANT 1501/21 · Surveys2021-06-04 → 2021-06-09
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  11. HYDROLANT 1489/21 · Surveys2021-06-03 → 2021-06-04
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  12. HYDROLANT 1483/21 · Nav aids2021-06-02 → 2021-07-13
    All navigational aids at platform 49/27-H 53-00.3N 002-12.9E inoperative
  13. HYDROLANT 1482/21 · Nav aids2021-06-02 → 2021-06-26
    All navigational aids at platform 49/18-AP, 53-21.8N 002-34.1E inoperative
  14. HYDROLANT 1457/21 · Surveys2021-05-30 → 2021-06-03
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  15. HYDROLANT 1452/21 · Surveys2021-05-30 → 2021-05-30
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  16. HYDROLANT 1442/21 · Surveys2021-05-28 → 2021-05-30
    Survey operations in progress until further notice by M/V akademik lazarev towing 13000 meter long cable in…
  17. HYDROLANT 1441/21 · Nav aids2021-05-28 → 2021-06-16
    Platform 48/12A, 53-32.8N 001-21.6E aids to navigation inoperative
  18. HYDROLANT 1394/21 · Surveys2021-05-24 → 2021-07-05
    Survey operations in progress until 12 jul by M/V fugro frontier, M/V fugro venturer and M/V fugro searcher…
  19. HYDROLANT 1389/21 · Surveys2021-05-24 → 2021-05-30
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 6500 meter long cables…
  20. HYDROLANT 1350/21 · Nav aids2021-05-19 → 2021-05-19
    RACON at north haisbro buoy 53-00-12N 001-32-24E inoperative

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