Survey operations in the North Sea

Hydrographic and scientific survey vessels, often towing long arrays.

in force
1
last 12 months
3
vs previous 12 (0)
—
since 1997
583

Coverage note: the NGA archive ends 2024-05 and live collection began 2026-08-17. Warnings issued in between are here only if they were still in force when collection started, so 2024–2026 are under-counted.

In force now · 1

  1. HYDROLANT 1496/26in force2026-08-03
    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.
    North Sea · Norway

Longest in force

  1. HYDROLANT 1496/26in force2026-08-03 · 19 d
    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.
    North Sea · Norway

By year

97
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

Other hazards in the North Sea

Archive · 582 cancelled

  1. HYDROLANT 2130/991999-10-06 → 1999-10-07
    Underwater operations in progress until further notice by M/V northern admiral vicinity 51-21.4N 001-33.2E
  2. HYDROLANT 2119/991999-10-06 → 1999-10-06
    Underwater operations in progress until 060700Z oct by M/V goosander between 51-23N 001-44E and 51-23N 002-25E
  3. HYDROLANT 2117/991999-10-05 → 1999-10-06
    Underwater operations in progress until further notice by M/V goosander and M/V northern admiral vicinity…
  4. HYDROLANT 2104/991999-10-03 → 1999-10-05
    Underwater operations in progress until further notice by M/V goosander and M/V northern admiral within two…
  5. HYDROLANT 2100/991999-10-03 → 1999-10-03
    Underwater operations in progress until further notice by M/V goosander and M/V northern admiral along…
  6. HYDROLANT 2081/991999-09-29 → 1999-09-29
    Underwater operations in progress until further notice by M/V goosander within four miles of 52-14.2N…
  7. HYDROLANT 2077/991999-09-29 → 1999-09-29
    Underwater operations in progress until further notice by M/V goosander within one mile of 52-12N 001-40E
  8. HYDROLANT 2074/991999-09-28 → 1999-09-28
    Underwater operations in progress until further notice by M/V goosander within four miles of 52-14N 002-14E
  9. HYDROLANT 2053/991999-09-27 → 1999-09-27
    Underwater operations in progress until further notice by M/V goosander along trackline joining 51-21N…
  10. HYDROLANT 2048/991999-09-26 → 1999-09-27
    Underwater operations in progress until further notice by M/V goosander along trackline between 51-21N…
  11. HYDROLANT 1934/991999-09-12 → 1999-09-15
    Underwater operations in progress until further notice by M/V goosander between 52-22.9N 003-26.4E and…
  12. HYDROLANT 1933/991999-09-12 → 1999-09-18
    Diving operations in progress until further notice by M/V aquamarine in 53-09.65N 002-44.10E
  13. HYDROLANT 1874/991999-09-03 → 1999-09-05
    Underwater operations in progress until further notice by M/V goosander between 52-13N 001-56E and 52-25N…
  14. HYDROLANT 1869/991999-09-03 → 1999-09-03
    Underwater operations in progress until further notice by M/V goosander between 52-12N 001-39E and 52-13N…
  15. HYDROLANT 1761/991999-08-21 → 1999-08-25
    Underwater operations in progress until further notice by dsv orelia in 54-11.0N 001-24.8E
  16. HYDROLANT 1752/991999-08-20 → 1999-08-27
    Underwater operations in progress until further notice by M/V challenger with submersible within four miles…
  17. HYDROLANT 1652/991999-08-07 → 1999-08-14
    Underwater operations in progress until further notice by M/V goosander vicinity of trackline joining 52-13N…
  18. HYDROLANT 1203/991999-06-10 → 1999-06-11
    Underwater operations in progress until further notice by M/V stephaniturm with submersible within 1.5 miles…
  19. HYDROLANT 1141/991999-06-03 → 1999-06-04
    Underwater operations in progress until further notice by M/V stephaniturm with submersible vicinity…
  20. HYDROLANT 948/991999-05-09 → 1999-05-10
    Underwater operations in progress until further notice by M/V seeryp 1 in vicinity of trackline joining…
  21. HYDROLANT 943/991999-05-08 → 1999-05-09
    Underwater operations in progress until further notice by M/V seeryp 1 along trackline between 51-21N…
  22. HYDROLANT 913/991999-05-05 → 1999-05-05
    Underwater operations in progress until further notice by M/V seeryp one vicinity of trackline between…
  23. HYDROLANT 886/991999-05-03 → 1999-05-04
    Underwater operations in progress until further notice by M/V seeryp one in vicinity of trackline between…
  24. HYDROLANT 872/991999-05-01 → 1999-05-02
    Underwater operations in progress until further notice by M/V seeryp 1 along track line between 51-20N…
  25. HYDROLANT 864/991999-04-30 → 1999-05-01
    Underwater operations in progress until further notice by M/V seeryp 1 along track line joining 51-22N…
  26. HYDROLANT 838/991999-04-27 → 1999-04-27
    Underwater operations in progress until further notice by M/V seeryp 1 in vicinity of trackline joining…
  27. HYDROLANT 807/991999-04-24 → 1999-04-25
    Underwater operations in progress until further notice by M/V scotian shore between 51-23.0N 002-25.2E and…
  28. HYDROLANT 765/991999-04-18 → 1999-04-23
    Underwater operations in progress until further notice by M/V scotian shore along trackline between 51-23N…
  29. HYDROLANT 721/991999-04-14 → 1999-04-18
    Survey operations in progress until further notice by M/V scotian shore towing equipment along trackline…
  30. HYDROLANT 671/991999-04-06 → 1999-04-12
    Survey operations in progress until further notice by M/V scotian shore towing equipment along trackline…
  31. HYDROLANT 362/991999-02-20 → 1999-02-21
    Underwater operations in progress until further notice by M/V highland fortress with submersible in vicinity…
  32. HYDROLANT 1818/971997-11-23 → 1999-03-13
    Diving operations in progress until further notice by M/V stephaniturm vicinity 53-10N 002-42E

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

Survey operations in the North Sea — page 12 · seahazards