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 · 268 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 · 67 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
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Other hazards in the South Atlantic Ocean

Archive · 2,275 cancelled

  1. HYDROLANT 2295/122012-10-02 → 2012-10-11
    Underwater operations in progress until further notice by M/V peace in africa within two miles of 28-32S…
    Eastern South Atlantic · Namibia
  2. HYDROLANT 2254/122012-09-27 → 2012-11-26
    Survey operations in progress until 25 nov by M/V ramform vanguard towing 12 cables in area bound by…
    Eastern South Atlantic · Angola
  3. HYDROLANT 2127/122012-09-14 → 2012-09-30
    Underwater operations in progress until further notice by M/V peace in africa within two miles of 28-36S…
    Eastern South Atlantic · Namibia
  4. HYDROLANT 2102/122012-09-10 → 2012-12-18
    Underwater operations in progress until further notice by M/V coral sea within two miles of 28-36.0S 016-03.7E
    Eastern South Atlantic · Namibia
  5. HYDROLANT 2101/122012-09-10 → 2012-09-14
    Underwater operations in progress until further notice by M/V peace africa within two miles of 28-45S 016-12E
    Eastern South Atlantic · South Africa
  6. HYDROLANT 2037/122012-09-04 → 2012-09-06
    Sesimic survey in progress until 05 sep by M/V hawk explorer towing 6.5 mile long cables in area bound by…
    Brazil-east Coast
  7. HYDROLANT 1735/122012-07-30 → 2012-08-20
    Underwater operations 1500Z to 2100Z daily until 20 aug by M/V acergy harrier along trackline joining…
    Brazil-southeast Coast
  8. HYDROLANT 1589/122012-07-16 → 2012-09-14
    Survey operations in progress until further notice by M/V oceanic endeavour towing 12 cables in area bound…
    Eastern South Atlantic · Angola
  9. HYDROLANT 1564/122012-07-14 → 2013-01-03
    Underwater operations 0800Z to 2000Z daily 17 jul thru 03 jan 13 by M/V slb harmonia, M/V confianca V, M/V…
    Brazil-north Coast
  10. HYDROLANT 1523/122012-07-09 → 2012-07-30
    Underwater operations 1500Z to 2100Z daily 12 jul thru 20 aug by M/V acergy harrier along trackline joining…
    Brazil-southeast Coast
  11. HYDROLANT 1522/122012-07-09 → 2012-07-13
    Brazil-east Coast
  12. HYDROLANT 1460/122012-07-03 → 2012-07-07
    Underwater operations 1100Z to 2100Z daily 03 thru 07 jul by M/V flora island in 24-10.92S 046-12.35W
    Brazil-south Coast
  13. HYDROLANT 1281/122012-06-15 → 2012-09-14
    Hydrographic survey in progress until 13 sep by M/V bahia star vicinity 01-47S 043-51W
    Brazil-north Coast
  14. HYDROLANT 1266/122012-06-13 → 2012-06-15
    Hydrographic survey in progress until 270259Z jun by M/V oyarbide in area bound by 34-22.25S 053-27.45W,…
    Western South Atlantic · Uruguay-east Coast
  15. HYDROLANT 1205/122012-06-05 → 2012-06-09
    Underwater operations in progress until 08 jun by M/V maersk helper and M/V maersk handler vicinity 23-10S…
    Brazil-south Coast
  16. HYDROLANT 1054/122012-05-16 → 2012-07-16
    Underwater operations in progress until 162000Z jul with submersible along trackline joining 05-02.23S…
    Brazil-north Coast
  17. HYDROLANT 849/122012-04-18 → 2012-05-01
    Oceanographic operations 20 thru 30 apr by M/V le suroit along trackline joining 02-00S 000-00, 02-00N…
    Eastern Atlantic · Gulf of Guinea
  18. HYDROLANT 827/122012-04-14 → 2012-06-30
    Underwater operations 1300Z to 2100Z daily 15 apr thru 30 jun by M/V acergy harrier along trackline joining…
    Brazil-east Coast
  19. HYDROLANT 818/122012-04-13 → 2012-04-21
    Seimic survey in progress until 210259Z apr by M/V nps wg cook towing 12 five mile long cables in area bound…
    Brazil-south Coast
  20. HYDROLANT 759/122012-04-06 → 2012-04-13
    Seimic survey in progress until 130300Z apr by M/V nps wg cook towing 12 five mile long cables in area bound…
    Brazil-southeast Coast
  21. HYDROLANT 729/122012-04-02 → 2012-04-19
    Oceanographic operations 04 thru 18 apr by M/V le suroit along trackline joining 01-30N 010-00W, 00-00N…
    Eastern Atlantic · Gulf of Guinea
  22. HYDROLANT 663/122012-03-25 → 2012-04-07
    Seimic survey in progress until 310259Z mar by M/V nps wg cook towing 12 five mile long cables in area bound…
    Brazil-south Coast
  23. HYDROLANT 661/122012-03-25 → 2012-03-31
    Seimic survey in progress until 310259Z mar by M/V nps western monarch towing three mile long cables in area…
    Brazil-southeast Coast
  24. HYDROLANT 653/122012-03-24 → 2012-04-02
    Oceanographic operations 26 mar thru 01 apr by M/V le suroit along trackline between 00-00N 010-00W and…
    Eastern Atlantic · Gulf of Guinea
  25. HYDROLANT 638/122012-03-22 → 2012-05-21
    Survey operations in progress until further notice by M/V ramform valiant towing ten cables in area bound by…
    Eastern South Atlantic · Angola
  26. HYDROLANT 578/122012-03-11 → 2012-03-26
    Survey operations 1000Z to 2100Z daily 12 thru 26 mar in area bound by 21-13.07S 040-50.10W, 21-19.33S…
    Brazil-southeast Coast
  27. HYDROLANT 541/122012-03-09 → 2012-05-15
    Underwater operations 0800Z to 2000Z daily until 15 may by M/V oceanicasub II, M/V asteomar V and M/V mar…
    Brazil-north Coast
  28. HYDROLANT 461/122012-03-01 → 2012-03-17
    Oceanographic operations in progress until 16 mar by M/V ara puerto deseado in area bound by 57-44.15S…
    South Atlantic · Scotia Sea
  29. HYDROPAC 598/122012-03-01 → 2012-03-17
    Oceanographic operations in progress until 16 mar by M/V ara puerto deseado in area bound by 57-44.15S…
    South Atlantic · Scotia Sea
  30. HYDROLANT 458/122012-03-01 → 2012-05-30
    Survey operations in progress until futher notice by M/V wg amundsen in area bound by 06-00.2S 010-65.8E,…
    Eastern South Atlantic · Angola
  31. HYDROLANT 455/122012-02-29 → 2012-03-22
    Survey operations in progress until further notice by M/V ramform valiant towing ten cables in area bound by…
    Eastern South Atlantic · Angola
  32. HYDROLANT 447/122012-02-28 → 2012-03-01
    Oceanographic operations in progress until further notice by M/V ara puerto deseado in area bound by…
    Scotia Sea
  33. HYDROPAC 578/122012-02-28 → 2012-03-01
    Oceanographic operations in progress until further notice by M/V ara puerto deseado in area bound by…
    Scotia Sea
  34. HYDROLANT 330/122012-02-09 → 2012-02-19
    Underwater operations 1000Z to 2000Z daily 12 thru 19 feb by vessel cabo velho vicinity 20-24.00S 040-08.13W
    Brazil-southeast Coast
  35. HYDROLANT 194/122012-01-24 → 2012-04-24
    Cancel this msg 24 apr
    Brazil-east Coast
  36. HYDROLANT 137/122012-01-18 → 2012-06-13
    Survey operations in progress until further notice by M/V bavenit in areas bound by: a. 06-08.67S…
    Eastern South Atlantic · Angola
  37. HYDROLANT 89/122012-01-11 → 2012-05-07
    Survey operations in progress until further notice by M/V western neptune towing 4.3 mile long cables in…
    Eastern South Atlantic · Angola
  38. HYDROLANT 2099/112011-12-09 → 2011-12-13
    Underwater operations in progress until 130001Z dec by M/V acergy harrier in 19-33.20S 039-22.10W
    Brazil-southeast Coast
  39. HYDROLANT 2043/112011-12-03 → 2011-12-22
    Underwater operations 0900Z to 1900Z daily 06 thru 22 dec by M/V president kennedy along trackline joining…
    Brazil-east Coast
  40. HYDROLANT 1871/112011-11-09 → 2011-12-28
    Survey operations in progress until further notice by M/V western neptune towing 4.3 mile long cables in…
    Eastern South Atlantic · Angola
  41. HYDROLANT 1795/112011-10-31 → 2011-12-01
    Hydrographic survey in progress until 30 nov by M/V cape cumbria along trackline joining 20-59.12S…
    Brazil-east Coast
  42. HYDROLANT 1766/112011-10-26 → 2011-11-09
    Survey operations in progress until further notice by M/V western jupiter in area bound by 08-46.0S…
    Eastern South Atlantic · Angola
  43. HYDROLANT 1742/112011-10-22 → 2012-03-01
    Survey operations in progress until futher notice by M/V wg amundsen in area bound by 06-00.2S 010-55.8E,…
    Eastern South Atlantic · Angola
  44. HYDROLANT 1664/112011-10-10 → 2011-10-31
    Underwater operations 130900Z to 312000Z oct along trackline joining 04-52.52S 036-22.30W, 04-52.52S…
    Brazil-north Coast
  45. HYDROLANT 1517/112011-09-20 → 2011-10-07
    Underwater operations 0900Z to 2000Z daily 23 sep thru 07 oct along trackline joining 04-52.52S 036-22.30W,…
    Brazil-north Coast
  46. HYDROLANT 1356/112011-08-25 → 2011-09-23
    Survey operations in progress until 22 sep by M/V rig supporter in areas bound by: a. 06-10.1S 011-08.5E,…
    Eastern South Atlantic · Angola
  47. HYDROLANT 1108/112011-07-05 → 2011-07-16
    Oceanographic operations in progress until 15 jul by M/V ara puerto deseado in area bound by 38-26S 057-40W,…
    Western South Atlantic · Argentina-northeast Coast · Uruguay-east Coast
  48. HYDROLANT 1095/112011-07-02 → 2011-07-05
    Oceanographic operations in progress until 15 jul by M/V puerto deseado along trackline joining 38-26S…
    Argentina-northeast Coast · Uruguay-south Coast
  49. HYDROLANT 1091/112011-07-01 → 2011-10-11
    Drilling operations in progress until further notice by M/V diamond ocean confidence in 07-25.6S 011-20.7E
    Eastern South Atlantic
  50. HYDROLANT 1006/112011-06-17 → 2011-07-11
    Drilling operations in progress until further notice by M/V stena drilmax I in 53-44S 062-38W
    Western South Atlantic · Argentina

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 38 · seahazards