North Sea

IHO sea area 4 · -4° to 12° E, 51° to 61° N

in force
1
last 12 months
7
since 1997
4,732
categories
11

In force now · 1

  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.

Longest in force

  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.

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 aids2,50353%
Other66914%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,731 cancelled

  1. HYDROLANT 1733/98 · Wrecks1998-09-09 → 1999-01-22
    Wreck, least depth 15 meters, marked by two west cardinal buoys, one with RACON (d) in 52-22.2N 003-46.8E
  2. HYDROLANT 1692/98 · Wrecks1998-09-03 → 2000-03-24
    Obstruction reported in 53-11.3N 001-16.2E
  3. HYDROLANT 1507/98 · Other1998-08-06 → 1999-03-12
    Pipelaying operations in progress until further notice by M/V laybarge castoro sei along trackline joining…
  4. HYDROLANT 1147/98 · Wrecks1998-06-16 → 2000-03-24
    Obstruction reported vicinity 54-14.23N 000-34.11E
  5. HYDROLANT 1038/98 · Other1998-06-03 → 1999-01-01
    Platform under construction in 53-21.1N 001-18.3E
  6. HYDROLANT 435/98 · Mines1998-03-11 → 2000-11-03
    Unexploded mine reported in 54-31.2N 001-53.8E
  7. HYDROLANT 1963/97 · Nav aids1997-12-15 → 1999-02-19
    West cardinal buoy 53-14N 002-49E unlit
  8. HYDROLANT 1818/97 · Surveys1997-11-23 → 1999-03-13
    Diving operations in progress until further notice by M/V stephaniturm vicinity 53-10N 002-42E
  9. HYDROLANT 1682/97 · Nav aids1997-11-03 → 1999-02-19
    Platform NSR-R3 (53-39N 002-57E) unlit
  10. HYDROLANT 813/97 · Other1997-06-02 → 1999-07-09
    With effect from 030001Z jun 97, the deep water route (dwr) via off brown ridge tss (53-00N 003-20E) is a…
  11. HYDROLANT 715/97 · Other1997-05-08 → 1999-03-13
    North ronaldsay light 59-23N 002-23W at reduced intensity

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