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 3329/17 · Exercises2017-10-17 → 2017-10-18
    Hazardous operations 180600Z to 181000Z oct in area bound by 55-44.0N 001-15.9W, 55-44.0N 000-07.5E,…
  2. HYDROLANT 3328/17 · Nav aids2017-10-17 → 2017-10-18
    Kinnairds head light 57-41.9N 002-00.2W unreliable
  3. HYDROLANT 3303/17 · Exercises2017-10-16 → 2017-10-16
    Hazardous operations 161200Z to 161600Z oct in area bound by 55-44.0N 001-15.9W, 55-44.0N 000-07.5E,…
  4. HYDROLANT 3276/17 · Wrecks2017-10-14 → 2017-11-17
    Dangerous wreck in 52-25.2N 001-49.7E marked by buoy, RACON (d) to north
  5. HYDROLANT 3271/17 · Nav aids2017-10-13 → 2017-10-15
    Platform 49/26-D, 53-00.5N 002-11.1E unlit
  6. HYDROLANT 3266/17 · Surveys2017-10-13 → 2017-10-20
    Underwater operations in progress until further notice by M/V rambiz 3000 in 53-05.0N 002-32.7E
  7. HYDROLANT 3264/17 · Nav aids2017-10-12 → 2017-11-22
    Fog signal at platform 9/13-SPM3, 59-32.0N 001-33.5E inoperative
  8. HYDROLANT 3260/17 · Nav aids2017-10-12 → 2017-11-23
    All navigational aids at platform 49/9-QC, 53-41.7N 002-37.3E inoperative
  9. HYDROLANT 3258/17 · Nav aids2017-10-12 → 2017-10-12
    Fog signal at platform 49/9-QC, 53-41.7N 002-37.3E inoperative
  10. HYDROLANT 3253/17 · Surveys2017-10-11 → 2017-11-18
    Salvage operations in progress until further notice in 51-40.20N 002-13.58E
  11. HYDROLANT 3251/17 · Nav aids2017-10-11 → 2017-11-09
    All navigational aids at platform 49/23E, 53-11.9N 002-29.1E inoperative
  12. HYDROLANT 3250/17 · Nav aids2017-10-11 → 2017-11-21
    All navigational aids at platform 49/30A, 53-00.3N 002-53.8E inoperative
  13. HYDROLANT 3203/17 · Nav aids2017-10-08 → 2017-10-14
    All navigational aids at platform 48/17C, 53-21.2N 001-18.3E inoperative
  14. HYDROLANT 3171/17 · Nav aids2017-10-05 → 2017-10-05
    Dgps station at flamborough head 54-07N 000-05W off air until 051600Z oct
  15. HYDROLANT 3136/17 · Nav aids2017-10-03 → 2017-10-05
    Dgps station at flamborough head light 54-07N 000-05W off air 0730Z to 1600Z daily 03 and 04 oct and 050730Z…
  16. HYDROLANT 3109/17 · Other2017-09-30 → 2017-11-11
    Unexploded ordnance in 51-19.31N 001-56.12E
  17. HYDROLANT 3101/17 · Wrecks2017-09-29 → 2017-11-10
    Fog signals at sheringham shoal wind farm 53-08N 001-10E unreliable
  18. HYDROLANT 3078/17 · Surveys2017-09-28 → 2017-11-09
    Underwater operations in progress until further notice by M/V havila phoenix in vicinity of trackline…
  19. HYDROLANT 3075/17 · Surveys2017-09-27 → 2017-10-26
    Survey operations in progress until further notice by M/V sanco swift towing 12 9000 meter long cables in…
  20. HYDROLANT 3073/17 · Surveys2017-09-27 → 2017-09-28
    Underwater operations in progress until further notice by M/V havila phoenix in vicinity 51-19.2N 001-33.1E

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