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
M
A
M
J
J
A
S
O
N
D

Other hazards in the South Atlantic Ocean

Archive · 2,275 cancelled

  1. HYDROLANT 935/112011-06-04 → 2011-08-24
    Survey operations in progress until further notice by M/V ramford sterling along trackline between 07-22.1S…
    Eastern South Atlantic
  2. HYDROLANT 879/112011-05-25 → 2011-07-15
    Survey operations 0900Z to 2100Z daily 25 may thru 15 jul by M/V mar azul and M/V fermisa vicinity 19-33.80S…
    Brazil-east Coast
  3. HYDROLANT 829/112011-05-16 → 2011-06-02
    Survey operations 19 may thru 01 jun by M/V sirius in area bound by 03-50S 032-40W, 03-57S 032-40W, 03-57S…
    Brazil-northeast Coast
  4. HYDROLANT 766/112011-05-06 → 2011-05-13
    Hydrographic survey 09 thru 12 may by M/V sirius in area bound by 10-42S 036-27W, 10-31S 036-07W, 10-51S…
    Brazil-east Coast
  5. HYDROLANT 719/112011-04-27 → 2011-06-16
    Survey operations 01 may thru 15 jun by M/V le suroit along trackline joining 00-00N 010-00W, 06-00S…
    Gulf of Guinea
  6. HYDROLANT 714/112011-04-27 → 2011-05-05
    Hydrographic survey 30 apr thru 04 may by M/V sirius in area between 04-33S 036-27W, 04-44S 036-31W, 04-35S…
    Brazil-northeast Coast
  7. HYDROLANT 713/112011-04-27 → 2011-05-10
    Geophysical survey in progress until further notice by M/V reflect aries towing 8500 meter long cable along…
    Argentina-northeast Coast · Uruguay-south Coast
  8. HYDROLANT 629/112011-04-15 → 2011-04-27
    Geophysical survey in progress until further notice by M/V reflect aries towing 8500 meter long cable along…
    Argentina-northeast Coast · Uruguay-south Coast
  9. HYDROLANT 571/112011-04-05 → 2011-04-15
    Geophysical survey in progress until further notice by M/V reflect aries towing 8500 meter long cable along…
    Argentina-northeast Coast · Uruguay-south Coast
  10. HYDROLANT 558/112011-04-02 → 2011-04-05
    Geophysical survey in progress until further notice by M/V reflect aries towing 8500 meter long cable along…
    Argentina-northeast Coast · Uruguay-south Coast
  11. HYDROLANT 521/112011-03-29 → 2011-04-02
    Geophysical survey in progress until further notice by M/V reflect aries towing 8500 meter long cable along…
    Argentina-northeast Coast · Uruguay-south Coast
  12. HYDROLANT 485/112011-03-24 → 2011-03-29
    Geophysical survey in progress until further notice by M/V reflect aries towing 8100 meter long cable in…
    Argentina-northeast Coast · Uruguay-south Coast
  13. HYDROLANT 464/112011-03-22 → 2011-03-27
    Underwater operations 1100Z to 1700Z daily 23 thru 27 mar in: a. 20-40.02S 040-29.57W
    Brazil-east Coast
  14. HYDROLANT 446/112011-03-18 → 2011-03-24
    Scientific survey in progress until further notice by M/V reflect aries towing 8100 meter long cable in…
    Argentina-northeast Coast · Uruguay-south Coast
  15. HYDROLANT 415/112011-03-14 → 2011-03-26
    Survey operations 17 thru 25 mar by M/V sirius in area bound by 29-16S 048-08W, 29-16S 047-17W, 30-46S…
    Brazil-south Coast
  16. HYDROLANT 379/112011-03-07 → 2011-03-14
    Survey operations 10 thru 13 mar by M/V sirius in area bound by 26-04S 045-54W, 26-41S 046-37W, 26-53S…
    Brazil-south Coast
  17. HYDROLANT 361/112011-03-03 → 2011-04-21
    Survey operations in progress until 20 apr by M/V W.G
    Eastern South Atlantic · Angola
  18. HYDROLANT 330/112011-02-26 → 2011-03-04
    Survey operations 280300Z feb to 040259Z mar by M/V sirius in area bound by 26-04S 045-54W, 26-15S 045-41W,…
    Brazil-south Coast
  19. HYDROLANT 294/112011-02-18 → 2011-02-28
    Survey operations in progress until 27 feb by M/V pourquoi pas along trackline between 06-14.0S 005-00.4E…
    Eastern South Atlantic
  20. HYDROLANT 217/112011-02-04 → 2011-02-10
    Survey operations 0800Z to 2000Z daily 03 thru 10 feb by M/V mar azul and M/V fermisa vicinity 19-33.82S…
    Brazil-east Coast
  21. HYDROLANT 203/112011-02-02 → 2011-02-17
    Survey operations by M/V pourquoi pas with submersible: a. in progress until 102359Z feb in area between…
    Eastern South Atlantic
  22. HYDROLANT 170/112011-01-28 → 2011-02-02
    Survey operations in progress until 16 feb by M/V pourquoi pas with submersible in areas: a. between…
    Eastern South Atlantic
  23. HYDROLANT 166/112011-01-27 → 2011-01-28
    Survey operations 28 jan thru 28 feb by M/V pourquoi pas in areas: a. between 01-36.0S 01-33.0S and…
    Eastern South Atlantic
  24. HYDROLANT 158/112011-01-26 → 2011-02-11
    Underwater operations in progress until 110259Z feb by M/V acergy harrier in 19-33.17S 039-31.62W
    Brazil-southeast Coast
  25. HYDROLANT 2400/102010-12-11 → 2011-01-06
    Underwater operations in progress until 062100Z jan 11 by M/V toisa pegasus in 24-21.1S 044-23.0W
    Brazil-south Coast
  26. HYDROLANT 2380/102010-12-10 → 2010-12-23
    Underwater operations 0900Z to 2000Z daily 11 thru 23 dec in: a. 04-55.40S 036-22.53W
    Brazil-northeast Coast
  27. HYDROLANT 2270/102010-11-27 → 2010-12-03
    Underwater operations in progress until 031500Z dec by M/V acergy harrier vicinity 13-29.37S 038-46.72W
    Brazil-east Coast
  28. HYDROLANT 2178/102010-11-17 → 2010-12-31
    Survey operations in progress until 12 jul 11 in: a. 23-36.25S 041-34.37W
    Brazil-southeast Coast
  29. HYDROLANT 2013/102010-10-24 → 2011-01-31
    Survey operations in progress until further notice by M/V apollo towing 3000 meter long cables in area bound…
    Eastern South Atlantic · Angola
  30. HYDROLANT 1948/102010-10-13 → 2010-10-20
    Underwater operations in progress until 200300Z oct by M/V toisa sentinel within 500 meters of 13-29.37S…
    Brazil-east Coast
  31. HYDROLANT 1930/102010-10-11 → 2010-10-15
    Survey operations 131100Z to 151000Z oct by M/V albardao and M/V aracatuba in area bound by 08-09.1S…
    Brazil-east Coast
  32. HYDROLANT 1798/102010-09-23 → 2010-10-31
    Underwater operations in progress until 312030Z oct by M/V chloe candies in 24-21.08S 044-23.03W
    Brazil-south Coast
  33. HYDROLANT 1797/102010-09-23 → 2010-10-31
    Underwater operations in progress until 312000Z oct by M/V normand cutter in: a. 24-18.02S 042-43.62W
    Brazil-south Coast
  34. HYDROLANT 1795/102010-09-23 → 2010-09-23
    Underwater operations in progress until 312030Z oct by M/V normand cutter and M/V chloe candies in 24-21.08S…
    Brazil-south Coast
  35. HYDROLANT 1643/102010-08-31 → 2010-09-15
    Underwater operations in progress until 152000Z sep by M/V chloe candies in 24-21.08S 044-23.03W
    Brazil-south Coast
  36. HYDROLANT 1634/102010-08-31 → 2010-09-23
    Underwater operations 310900Z aug to 312000Z oct by M/V normand cutter in: a. 24-18.02S 042-43.62W
    Brazil-south Coast
  37. HYDROLANT 1612/102010-08-27 → 2010-10-01
    Underwater operations in progress until 010300Z oct by M/V acergy harrier vicinity 19-33.18S 039-31.03W
    Brazil-east Coast
  38. HYDROLANT 1560/102010-08-18 → 2010-08-27
    Underwater operations 180700Z aug to 190300Z sep by M/V acergy harrier vicinity 19-33.18S 039-31.03W
    Brazil-east Coast
  39. HYDROLANT 1449/102010-07-29 → 2010-08-16
    Underwater operations 29 jul thru 15 aug by M/V acergy harrier in vicinity 19-33.18S 039-31.03W
    Brazil-east Coast
  40. HYDROLANT 1409/102010-07-23 → 2010-07-29
    Underwater operations 1100Z to 0300Z commencing daily until 06 aug by M/V toisa sentinel vicinity 19-33.17S…
    Brazil-east Coast
  41. HYDROLANT 1391/102010-07-21 → 2010-07-23
    Underwater operations in progress until 06 aug by M/V toisa sentinel vicinity 19-33.17S 039-31.17W
    Brazil-east Coast
  42. HYDROLANT 1241/102010-07-02 → 2010-07-08
    Oceanographic operations in progress until 07 jul by M/V antares in area bound by 22-08S 040-32W, 22-12S…
    Brazil-southeast Coast
  43. HYDROLANT 977/102010-05-30 → 2010-09-17
    Underwater operations in progress until further notice by M/V fugro explorer in area bound by 06-45.0S…
    Eastern South Atlantic · Angola
  44. HYDROLANT 519/102010-03-26 → 2010-05-15
    Hydrographic survey in progress until 14 may by M/V maldonado along trackline joining 34-56.49S 055-00.65W,…
    Uruguay-south Coast
  45. HYDROLANT 516/102010-03-25 → 2010-03-29
    Survey operations in progress until 28 mar by M/V sirius in area bound by 30-31S 048-06W, 30-31S 048-41W,…
    Brazil-south Coast
  46. HYDROLANT 509/102010-03-24 → 2010-03-26
    Hydrographic survey 25 mar thru 14 may by M/V maldonado along trackline joining 34-56.49S 055-00.65W,…
    Uruguay-south Coast
  47. HYDROLANT 390/102010-03-03 → 2010-03-13
    Survey operations in progress until 130359Z mar by M/V knorr in area bound by 04-00N 043-00W, 02-00S…
    Brazil-north Coast
  48. HYDROLANT 270/102010-02-11 → 2010-03-25
    Survey operations in progress until 14 feb, 27 feb thru 12 mar and 18 thru 27 mar by M/V sirius in area…
    South Atlantic · Brazil
  49. HYDROLANT 115/102010-01-19 → 2010-01-25
    Underwater operations in progress until 24 jan within 200 meters of: a. 19-33.70S 039-15.35W
    Brazil-east Coast
  50. HYDROLANT 2379/092009-12-07 → 2009-12-16
    Oceanographic operations 10 thru 15 dec by M/V antares in area bound by 28-35S 048-50W, 30-20S 045-35W,…

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 39 · seahazards