Survey operations in the South Atlantic Ocean

Hydrographic and scientific survey vessels, often towing long arrays.

in force
18
last 12 months
30
vs previous 12 (4)
+650%
since 1998
2,293

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 · 18

  1. HYDROLANT 1573/26in force2026-08-14
    Underwater operations by vessels Comando B and Rosco Banyan in South Atlantic, Brazil at 20-23S 040-10W daily 15-29 August, wide berth requested.
    South Atlantic · Brazil
  2. HYDROLANT 1566/26in force2026-08-13
    Underwater operations by vessels Comando B and Faneromeni in South Atlantic off Brazil at 20-23.67S 040-09.45W, 12-21 August daily 1100Z-2100Z, wide berth requested.
    South Atlantic · Brazil
  3. HYDROLANT 1565/26in force2026-08-13
    Underwater operations by vessels Comando B and AM Kirti occur daily from 13 to 22 August at 20-23.90S 040-09.67W; wide berth requested.
    South Atlantic · Brazil
  4. HYDROLANT 1560/26in force2026-08-13
    Underwater operations are in progress off Brazil until 27 August by vessels Navios Felix and Comando B at 20-22.12S 040-08.38W; wide berth requested.
    South Atlantic · Brazil
  5. HYDROLANT 1544/26in force2026-08-10
    Underwater operations by vessels Comando B and Faneromeni occur daily 0800Z to 1800Z from 11 to 25 August at 20-23S 040-09W, wide berth requested.
    South Atlantic · Brazil
  6. HYDROLANT 1541/26in force2026-08-09
    Survey operations by tug MCE Navegacao I in South Atlantic off Brazil from 10 August 2026 to 8 March 2027. Wide berth requested.
    South Atlantic · Brazil
  7. HYDROLANT 1540/26in force2026-08-09
    The vessel Ramform Titan is conducting survey operations towing twelve 9000-meter-long cables off Brazil from 10 to 17 August.
    South Atlantic · Brazil
  8. HYDROLANT 1529/26in force2026-08-08
    Survey operations are in progress until 09 July 2027 by vessel BGP Dragon towing a 250-meter cable near Brazil; wide berth requested.
    South Atlantic · Brazil
  9. HYDROLANT 1523/26in force2026-08-07
    Underwater operations by motor vessels Marsanne and Comando B in South Atlantic off Brazil at 20-23.57S 040-08.87W, daily Aug 8-22, wide berth requested, canceled Aug 26.
    South Atlantic · Brazil
  10. HYDROLANT 1512/26in force2026-08-06
    Underwater operations are underway in South Atlantic off Brazil at 22-22.48S 040-25.05W until 170259Z August, wide berth requested; message cancels 170359Z August.
    South Atlantic · Brazil
  11. HYDROLANT 1484/26in force2026-08-01
    Underwater operations by M/V Comando B and M/V Royal Topaz at 20-21.62S 040-08.00W off Brazil, August 2-16, wide berth requested.
    South Atlantic · Brazil
  12. HYDROLANT 1445/26in force2026-07-27
    Underwater operations by vessel UMI Polaris in the South Atlantic off Brazil from 28 July to 19 August, wide berth requested.
    South Atlantic · Brazil
  13. HYDROLANT 1294/26in force2026-07-03
    Survey operations are underway by vessel Ramform Victory towing 12 cables three miles long in the South Atlantic off Angola; a five-mile berth is requested.
    South Atlantic · Angola
  14. HYDROLANT 1160/26in force2026-06-17
    Underwater operations by vessel Fugro Vaquita are in progress until 140001Z November, with wide berth requested; cancels HYDROLANT 1157/26.
  15. HYDROLANT 1021/26in force2026-05-27
    Survey operations continue until August 31, 2200 UTC in the South Atlantic off Brazil; wide berth requested.
    South Atlantic · Brazil
  16. HYDROLANT 985/26in force2026-05-21
    Underwater operations by vessel Fugro Vaquita continue until August 31st in the South Atlantic off Brazil, wide berth requested.
    South Atlantic · Brazil
  17. HYDROLANT 397/26in force2026-02-27
    A yellow scientific buoy flashing every 20 seconds is established at 27-24.38S 047-15.92W off Brazil until 25 August.
    South Atlantic · Brazil
  18. HYDROLANT 2010/25in force2025-11-28
    Underwater survey operations by vessel Fugro Vaquita off Brazil daily from 10:00 to 20:00 UTC until November 2, 2026; wide berth requested.
    South Atlantic · Brazil

Longest in force

  1. HYDROLANT 2010/25in force2025-11-28 · 267 d
    Underwater survey operations by vessel Fugro Vaquita off Brazil daily from 10:00 to 20:00 UTC until November 2, 2026; wide berth requested.
    South Atlantic · Brazil
  2. HYDROLANT 397/26in force2026-02-27 · 177 d
    A yellow scientific buoy flashing every 20 seconds is established at 27-24.38S 047-15.92W off Brazil until 25 August.
    South Atlantic · Brazil
  3. HYDROLANT 985/26in force2026-05-21 · 93 d
    Underwater operations by vessel Fugro Vaquita continue until August 31st in the South Atlantic off Brazil, wide berth requested.
    South Atlantic · Brazil
  4. HYDROLANT 1021/26in force2026-05-27 · 87 d
    Survey operations continue until August 31, 2200 UTC in the South Atlantic off Brazil; wide berth requested.
    South Atlantic · Brazil
  5. HYDROLANT 1160/26in force2026-06-17 · 66 d
    Underwater operations by vessel Fugro Vaquita are in progress until 140001Z November, with wide berth requested; cancels HYDROLANT 1157/26.

By year

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
25
26

By month (all years)

J
F
M
A
M
J
J
A
S
O
N
D

Other hazards in the South Atlantic Ocean

Archive · 2,275 cancelled

  1. HYDROLANT 45/192019-01-04 → 2019-01-11
    Survey operations in progress until 11 jan by M/V subsea viking with submersible in area bound by 24-31.68S…
    Western South Atlantic · Brazil-south Coast
  2. HYDROLANT 44/192019-01-04 → 2019-01-12
    Survey operations in progress until 11 jan by M/V kommandor iona in area bound by 21-18S 039-58W, 21-18S…
    Western South Atlantic · Brazil-southeast Coast
  3. HYDROLANT 4079/182018-12-31 → 2019-01-25
    Survey operations in progress until further notice by M/V ramform sovereign towing 10050 meter long cables…
    Eastern South Atlantic
  4. HYDROLANT 4027/182018-12-26 → 2019-01-05
    Survey operations in progress until 04 jan 19 by M/V subsea viking with submersible in area bound by…
    Western South Atlantic · Brazil-south Coast
  5. HYDROLANT 4026/182018-12-26 → 2019-01-05
    Survey operations in progress until 04 jan 19 by M/V haiyangshiyou 720 towing ten 11500 meter long cables in…
    Western South Atlantic
  6. HYDROLANT 4025/182018-12-26 → 2019-01-04
    Survey operations in progress until 04 jan 19 by M/V kommandor iona with submersible in area bound by 21-18S…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 4024/182018-12-26 → 2019-01-05
    Survey operations in progress until 04 jan 19 by M/V vantage towing six 155 meter long cables in area bound…
    Western South Atlantic · Brazil-south Coast
  8. HYDROLANT 3992/182018-12-22 → 2018-12-24
    Survey operations in progress until 23 dec by M/V haiyangshiyou 720 towing ten 11500 meter long cables in…
    Western South Atlantic
  9. HYDROLANT 3978/182018-12-21 → 2018-12-31
    Survey operations in progress until further notice by M/V ramform sovereign towing 10050 meter long cables…
    Eastern South Atlantic
  10. HYDROLANT 3968/182018-12-20 → 2018-12-27
    Survey operations in progress until 26 dec by M/V kommandor iona with submersible in area bound by 21-18S…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 3967/182018-12-20 → 2018-12-22
    Survey operations in progress until 26 dec by M/V haiyangshiyou 720 towing ten 11500 meter long cables in…
    Western South Atlantic
  12. HYDROLANT 3966/182018-12-20 → 2018-12-27
    Survey operations in progress until 26 dec by M/V subsea viking with submersible in area bound by 24-31.40S…
    Western South Atlantic · Brazil-south Coast
  13. HYDROLANT 3964/182018-12-20 → 2018-12-27
    Survey operations in progress until 26 dec by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  14. HYDROLANT 3947/182018-12-19 → 2019-07-16
    Survey operations in progress until 15 jul 19 by M/V ivan gubkin towing 12 9000 meter long cables in area…
    Western South Atlantic · Brazil-northeast Coast
  15. HYDROLANT 3941/182018-12-18 → 2019-02-07
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  16. HYDROLANT 3930/182018-12-17 → 2018-12-20
    Survey operations in progress until 20 dec by M/V haiyangshiyou 720 towing ten 11,500 meter long cables in…
    Western South Atlantic
  17. HYDROLANT 3899/182018-12-14 → 2018-12-20
    Survey operations in progress until 20 dec by M/V kommandor iona in area bound by 21-18S 039-58W, 21-18S…
    Western South Atlantic · Brazil-southeast Coast
  18. HYDROLANT 3898/182018-12-14 → 2018-12-17
    Survey operations in progress until 16 dec by M/V haiyangshiyou 720 towing ten 11,500 meter long cables in…
    Western South Atlantic
  19. HYDROLANT 3877/182018-12-12 → 2018-12-20
    Survey operations in progress until 19 dec by M/V subsea viking with submersible in area bound by 24-31.35S…
    Western South Atlantic · Brazil-south Coast
  20. HYDROLANT 3876/182018-12-12 → 2018-12-20
    Survey operations in progress until 19 dec by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  21. HYDROLANT 3794/182018-12-05 → 2018-12-13
    Survey operations in progress until 12 dec by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  22. HYDROLANT 3793/182018-12-05 → 2018-12-13
    Survey operations in progress until 12 dec by M/V subsea viking with submersible in area bound by 24-31.35S…
    Western South Atlantic · Brazil-south Coast
  23. HYDROLANT 3774/182018-12-04 → 2018-12-13
    Survey operations in progress until 12 dec by M/V kommandor ion in area bound by 21-18S 039-58W, 21-18S…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 3711/182018-11-28 → 2018-12-05
    Survey operations in progress until 04 dec by M/V vantage towing six 150 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  25. HYDROLANT 3709/182018-11-28 → 2018-12-06
    Survey operations in progress until 05 dec by M/V subsea viking in area bound by 24-31.25S 042-46.22W,…
    Western South Atlantic · Brazil-south Coast
  26. HYDROLANT 3630/182018-11-22 → 2018-11-29
    Survey operations in progress until 28 nov by M/V subsea viking in area bound by 24-31S 042-46W, 24-22S…
    Western South Atlantic · Brazil-south Coast
  27. HYDROLANT 3626/182018-11-22 → 2018-11-29
    Survey operations in progress until 28 nov by M/V vantage towing six 150 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  28. HYDROLANT 3613/182018-11-21 → 2018-12-01
    Underwater operations 20 thru 30 nov by M/V navio patrulha araguari in area bound by 05-30S 034-50W, 04-00S…
    Western South Atlantic · Brazil-northeast Coast
  29. HYDROLANT 3538/182018-11-15 → 2019-01-13
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 26-32.51S…
    Eastern South Atlantic · Namibia
  30. HYDROLANT 3536/182018-11-15 → 2018-11-23
    Survey operations in progress until 22 nov by M/V subsea viking with submersible in area bound by 24-31S…
    Western South Atlantic · Brazil-south Coast
  31. HYDROLANT 3535/182018-11-15 → 2018-11-18
    Survey operations in progress until 17 nov by M/V oceanic champion towing 14 6667 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 3467/182018-11-08 → 2018-11-14
    Survey operations in progress until 13 nov by M/V vantage towing six 150 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  33. HYDROLANT 3466/182018-11-08 → 2018-11-14
    Survey operations in progress until 13 nov by M/V subsea viking in area bound by 24-31.28S 042-46.28W,…
    Western South Atlantic · Brazil-south Coast
  34. HYDROLANT 3412/182018-11-02 → 2018-11-17
    Underwater operations in progress until further notice by M/V the explorer in area bound by 29-05.62S…
    Eastern South Atlantic · South Africa
  35. HYDROLANT 3411/182018-11-02 → 2018-11-11
    Survey operations 03 thru 10 nov by M/V oceanic champion towing 14 5794 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 3404/182018-11-01 → 2018-11-08
    Underwater operations in progress until 07 nov by M/V subsea viking in area bound by 24-36.43S 042-43.75W,…
    Western South Atlantic · Brazil-south Coast
  37. HYDROLANT 3380/182018-10-31 → 2018-11-08
    Survey operations in progress until 07 nov by M/V vantage towing six 150 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  38. HYDROLANT 3369/182018-10-29 → 2018-11-04
    Underwater operations in progress until 03 nov by M/V subsea viking in area bound by 24-19S 042-24W, 24-48S…
    Western South Atlantic · Brazil-south Coast
  39. HYDROLANT 3367/182018-10-29 → 2018-10-31
    Survey operations in progress until 03 nov by M/V vantage towing six 150 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  40. HYDROLANT 3348/182018-10-27 → 2018-11-02
    Survey operations 27 oct thru 03 nov by M/V oceanic champion towing 14 3700 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 3291/182018-10-19 → 2018-10-28
    Survey operations in progress until 27 oct by M/V oceanic champion towing 14 3700 meter long cable in area…
    Western South Atlantic · Brazil-southeast Coast
  42. HYDROLANT 3140/182018-10-06 → 2018-10-13
    Survey operations in progress until 12 oct by M/V oceanic champion towing 14 3700 meter long cable in area…
    Western South Atlantic · Brazil- Southeast Coast
  43. HYDROLANT 3072/182018-09-29 → 2018-10-07
    Survey operations in progress until 06 oct by M/V oceanic champion towing 14 3700 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 3023/182018-09-25 → 2018-12-19
    Survey operations in progress until further notice by M/V ramform sovereign towing 12 4000 meter long cables…
    Eastern South Atlantic
  45. HYDROLANT 2995/182018-09-21 → 2019-01-23
    Survey operations in progress until further notice by M/V polarcus alima towing ten 9000 meter long cables…
    Eastern South Atlantic · Namibia
  46. HYDROLANT 2915/182018-09-15 → 2018-09-25
    Underwater operations 1100Z to 2000Z daily 15 thru 25 sep by M/V nm sbi maia, M/V proboat and M/V alta…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 2914/182018-09-14 → 2018-09-15
    Underwater operations 1100Z to 2000Z daily 15 thru 25 sep by M/V nm sbi maia, M/V proboat and M/V seamar III…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 2881/182018-09-12 → 2018-10-16
    Underwater operations 13 sep thru 15 oct by M/V estela claire, M/V gideao and M/V comando b in 20-19.5S…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 2880/182018-09-12 → 2018-10-16
    Underwater operations 13 sep thru 15 oct by M/V three saskias, M/V gideao and M/V comando b in 20-20.58S…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 2784/182018-09-01 → 2018-11-01
    Underwater operations in progress by M/V capitao margill in 24-23.99S 046-12.34W until 31 oct
    Western South Atlantic · Brazil-south Coast

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 South Atlantic Ocean — page 24 · seahazards