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 2378/092009-12-07 → 2009-12-21
    Oceanographic operations 10 thru 20 dec by M/V cruzeiro do sul along trackline between 20-00S 039-48W and…
  2. HYDROLANT 2255/092009-11-20 → 2009-12-02
    Oceanographic operations 23 nov thru 01 dec by M/V antares in area bound by 30-30S 050-10W, 32-15S 046-45W,…
  3. HYDROLANT 2242/092009-11-19 → 2010-02-21
    Survey operations 20 nov thru 20 feb by M/V gyre in area bound by 25-31S 042-50W, 24-18S 042-42W, 24-21S…
  4. HYDROLANT 2090/092009-10-28 → 2009-12-01
    Underwater operations 29 oct thru 30 nov by M/V acergy discovery vicinity 23-41S 045-13W
  5. HYDROLANT 2060/092009-10-24 → 2009-11-03
    Oceanographic operations in progress until 02 nov by M/V cruzeiro do sul vicinity of trackline between…
  6. HYDROLANT 1991/092009-10-14 → 2009-10-23
    Underwater operations in progress until 22 oct by M/V acergy harrie with divers within 200 meters of…
  7. HYDROLANT 1627/092009-08-27 → 2009-09-05
    Oceanographic operations by M/V antares: a. 30 aug thru 01 sep within five miles of 07-53.32S 030-27.85W
  8. HYDROLANT 1363/092009-07-23 → 2009-07-30
    Hydrographic survey in progress until 29 jul by M/V sea surveyor in area bound by 19-05.45S 038-51.48W,…
  9. HYDROLANT 1278/092009-07-09 → 2010-05-30
    Underwater operations in progress until further notice by M/V fugro explorer in area bound by 06-45.0S…
  10. HYDROLANT 1224/092009-07-01 → 2009-10-11
    Underwater operations 021100Z jul to 102300Z oct by M/V acergy discovery in 23-41S 045-13W
  11. HYDROLANT 992/092009-05-30 → 2009-06-09
    Survey operations 01 thru 08 jun by M/V comandante varella in area bound by 31-49.00S 051-38.30W, 31-44.42S…
  12. HYDROLANT 984/092009-05-29 → 2009-05-30
    Survey operations 01 thru 08 jun by M/V comandante varella in area bound by 30-34.47S 050-22.85W, 30-21.63S…
  13. HYDROLANT 772/092009-04-26 → 2009-05-02
    Oceanographic operations 29 apr thru 01 may by M/V amorim do valle within 30 miles of 32-00S 050-00W
  14. HYDROLANT 734/092009-04-20 → 2009-04-26
    Hydrographic survey 23 thru 25 apr by M/V amorim do valle within 30 miles of 28-30S 047-10W
  15. HYDROLANT 605/092009-03-28 → 2009-04-29
    Geophysical research operations 0800Z to 1700Z daily 31 mar thru 29 apr in area bound by 05-04.40S…
  16. HYDROLANT 241/092009-02-04 → 2009-02-05
    Underwater operations in progress until further notice by M/V acergy legend vicinity 06-16.5S 012-09.9E
  17. HYDROLANT 77/092009-01-14 → 2009-03-01
    Survey operations 16 jan thru 28 feb by M/V iduna in area bound by 07-37.32S 034-48.28W, 07-37.84S…
  18. HYDROLANT 2176/082008-12-17 → 2009-01-07
    Underwater operations 18 dec thru 06 jan 09 by M/V iduna in area bound by 07-36.61S 034-48.37W, 07-36.61S…
  19. HYDROLANT 2063/082008-11-30 → 2008-12-05
    Underwater operations in progress until further notice by M/V acergy legend vicinity 06-16.5S 012-09.9E
  20. HYDROLANT 1907/082008-11-07 → 2008-12-10
    Underwater operations 09 nov thru 09 dec by M/V iduna in area bound by 07-36.61S 034-48.37W, 07-36.61S…
  21. HYDROLANT 1847/082008-10-31 → 2008-12-03
    Underwater operations 040300Z nov to 030259Z dec by M/V polar queen in area bound by 21-51S 039-43W, 21-51S…
  22. HYDROLANT 1783/082008-10-24 → 2008-11-09
    Survey operations 250600Z oct to 092100Z nov by M/V gyre in area bound by 10-07.07S 036-06.22W, 10-19.15S…
  23. HYDROLANT 1778/082008-10-24 → 2008-10-24
    Survey operations 250600Z oct to 092100Z nov by M/V gyre in area bound by 10-07.1S 036-06.2W, 10-19.1S…
  24. HYDROLANT 1621/082008-10-02 → 2008-11-04
    Underwater operations 03 oct thru 03 nov by M/V iduna with divers in area bound by 07-36.61S 034-48.37W,…
  25. HYDROLANT 1515/082008-09-18 → 2008-09-21
    Survey operations in progress until 211200Z sep by M/V comandante manhaes towing 20 meter long cable in area…
  26. HYDROLANT 1482/082008-09-13 → 2008-09-18
    Survey operations 161100Z to 211200Z sep by M/V comandante manhaes towing 20 meter long cable in area bound…
  27. HYDROLANT 1322/082008-08-13 → 2008-08-23
    Survey operations by M/V amorim do valle: a. 18 aug vicinity 20-20.34S 040-07.01W
  28. HYDROLANT 1284/082008-08-05 → 2008-08-13
    Underwater operations 02 thru 12 aug within 500 meters of: a. 19-33.83S 039-15.22W
  29. HYDROLANT 1278/082008-08-04 → 2008-08-05
    Underwater operations by divers 02 thru 12 aug in area bound by 19-33.83S 039-15.22W, 19-33.23S 039-22.33W,…
  30. HYDROLANT 1008/082008-06-19 → 2008-08-17
    Underwater operations in progress until 152100Z mar by M/V polar queen in area bound by 21-51.80S…
  31. HYDROLANT 791/082008-05-09 → 2008-08-09
    Underwater operations until further notice by M/V richard m currence within 1.5 miles of 21-11.5S 039-50.7W
  32. HYDROLANT 790/082008-05-09 → 2008-06-08
    Underwater operations in progress until 080259Z jun by M/V polar queen in area bound by 21-51S 039-52W,…
  33. HYDROLANT 269/082008-02-08 → 2008-02-22
    Survey operations by M/V amorim do valle: a. 10 and 11 feb vicinity 20-20.34S 040-07.01W
  34. HYDROLANT 83/082008-01-10 → 2008-01-14
    Hydrographic survey in progress until 140300Z jan by M/V ocean surveyor towing 20 meter long cable in area…
  35. HYDROLANT 20/082008-01-03 → 2008-01-08
    Hydrographic survey in progress until 080300Z jan by M/V ocean surveyor towing 20 meter long cable in area…
  36. HYDROLANT 2160/072007-12-27 → 2008-01-02
    Hydrographic survey in progress until 020300Z jan 08 by M/V ocean surveyor towing 20 meter long cable in…
  37. HYDROLANT 2133/072007-12-21 → 2007-12-27
    Hydrographic survey in progress until 270300Z dec by M/V ocean surveyor towing 20 meter long cable in area…
  38. HYDROLANT 1926/072007-11-21 → 2007-12-02
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  39. HYDROLANT 1915/072007-11-19 → 2007-11-21
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  40. HYDROLANT 1856/072007-11-08 → 2007-11-13
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  41. HYDROLANT 1847/072007-11-07 → 2007-11-14
    Oceanographic operations in progress until 140300Z nov by M/V oyarvide in area bound by 34-22.46S…
  42. HYDROLANT 1835/072007-11-05 → 2007-11-08
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  43. HYDROLANT 1801/072007-10-30 → 2007-11-05
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  44. HYDROLANT 1795/072007-10-29 → 2007-10-30
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  45. HYDROLANT 1780/072007-10-25 → 2007-10-29
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  46. HYDROLANT 1771/072007-10-24 → 2007-10-25
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  47. HYDROLANT 1758/072007-10-22 → 2007-10-24
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  48. HYDROLANT 1746/072007-10-19 → 2007-10-22
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  49. HYDROLANT 1731/072007-10-15 → 2007-10-21
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  50. HYDROLANT 1727/072007-10-13 → 2007-10-15
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…

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 40 · seahazards