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 1706/072007-10-09 → 2007-10-13
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  2. HYDROLANT 1682/072007-10-04 → 2007-10-09
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  3. HYDROLANT 1658/072007-09-29 → 2007-10-04
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  4. HYDROLANT 1572/072007-09-11 → 2007-09-29
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  5. HYDROLANT 1565/072007-09-10 → 2007-09-11
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  6. HYDROLANT 1426/072007-08-15 → 2007-12-27
    Underwater operations in progress until further notice within two miles of 06-22.83S 011-00.58E
  7. HYDROLANT 1360/072007-08-04 → 2007-08-16
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  8. HYDROLANT 1352/072007-08-02 → 2007-08-04
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  9. HYDROLANT 1329/072007-07-30 → 2007-08-02
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  10. HYDROLANT 1315/072007-07-26 → 2007-10-01
    Oceanographic operations in progress until 010259Z oct by M/V oceanographic professor besnard in area bound…
  11. HYDROLANT 1313/072007-07-26 → 2007-07-30
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  12. HYDROLANT 1303/072007-07-25 → 2007-07-28
    Oceanographic operations in progress until 27 jul by M/V antares in area bound by 23-48S 043-31W, 23-49S…
  13. HYDROLANT 1259/072007-07-17 → 2007-07-18
    Geophysical survey in progress until further notice by M/V bergen surveyor towing 6000 meter long cable in…
  14. HYDROLANT 1056/072007-06-18 → 2007-12-02
    Underwater operations in progress until further notice within two miles of 06-22.83S 011-00.58E
  15. HYDROLANT 715/072007-04-30 → 2007-05-05
    Oceanographic operations in progress until 050159Z may by M/V oyarvide in areas bound by: a. 34-26.47S…
  16. HYDROLANT 659/072007-04-21 → 2007-05-01
    Underwater operations in progress until 30 apr by M/V acergy harrier in 19-33.83S 039-15.52W
  17. HYDROLANT 652/072007-04-20 → 2007-04-21
    Underwater operations in progress until 30 apr by M/V acergy harrier vicinity 20-33.83S 039-15.50W
  18. HYDROPAC 543/072007-03-25 → 2007-04-23
    Research operations in progress until 22 apr by M/V sonne towing one 500 meter long cable in area bound by…
  19. HYDROLANT 320/072007-03-02 → 2007-03-07
    Survey operations in progress until 070300Z mar by M/V coastal surveyor II in area bound by 11-11.43S…
  20. HYDROLANT 319/072007-03-02 → 2007-03-04
    Survey operations in progress until 03 mar by M/V rem angler in area bound by 00-37.85S 043-43.67W,…
  21. HYDROLANT 309/072007-02-27 → 2007-03-01
    Survey operations in progress until 28 feb by M/V rem angler in area bound by 00-37.85S 043-43.67W,…
  22. HYDROLANT 295/072007-02-24 → 2007-02-27
    Survey operations 25 feb thru 16 mar by M/V rem angler in area bound by 00-37.85S 043-43.67W, 00-16.34S…
  23. HYDROLANT 183/072007-02-02 → 2007-02-08
    Hydrographic survey in progress until 150259Z feb by M/V ocean surveyor towing 600 meter long cable in area…
  24. HYDROLANT 101/072007-01-18 → 2007-01-31
    Hydrographic survey in progress until 310259Z jan by M/V ocean surveyor towing 600 meter long cable in area…
  25. HYDROLANT 25/072007-01-05 → 2007-01-17
    Hydrographic survey in progress until 170259Z jan by M/V ocean surveyor towing 600 meter long cable in area…
  26. HYDROLANT 2311/062006-12-28 → 2007-01-05
    Hydrographic survey in progress until 050259Z jan 07 by M/V ocean surveyor towing 600 meter long cable in…
  27. HYDROLANT 2268/062006-12-19 → 2006-12-28
    Hydrographic survey in progress until 280259Z dec by M/V coastal surveyor towing 600 meter long cable in…
  28. HYDROLANT 2204/062006-12-09 → 2006-12-16
    Hydrographic survey in progress until 160259Z dec by M/V ocean surveyor towing 500 meter long cable in area…
  29. HYDROLANT 2141/062006-12-01 → 2006-12-09
    Hydrographic survey in progress until 090259Z dec by M/V ocean surveyor towing 500 meter long cable in area…
  30. HYDROLANT 2105/062006-11-22 → 2006-11-30
    Survey operations in progress until 300259Z nov by M/V ocean surveyor towing one 500 meter long cable in…
  31. HYDROLANT 2085/062006-11-18 → 2006-11-22
    Survey operations in progress until 220259Z nov by M/V ocean surveyor in area bound by 24-02.9S 046-28.8W,…
  32. HYDROLANT 2076/062006-11-16 → 2006-11-18
    Survey operations in progress until 220259Z nov by M/V ocean surveyor in area bound by 24-02.9S 046-28.8W,…
  33. HYDROLANT 1920/062006-10-19 → 2006-10-28
    Survey operations 210300Z to 280259Z oct by M/V ocean surveyor in area bound by 19-24.72S 039-42.72W,…
  34. HYDROLANT 1650/062006-09-11 → 2006-09-15
    Survey operations in progress until 150300Z sep by M/V mt oceansat peg I in area bound by 11-09.40S…
  35. HYDROLANT 1566/062006-08-26 → 2006-08-30
    Hydrographic survey in progress until 29 aug by M/V oceansat PEG-1 along trackline joining 01-34.98S…
  36. HYDROLANT 1446/062006-08-05 → 2007-01-01
    Underwater operations 061000Z aug thru 31 dec with submersible along trackline joining 22-06-28S 040-11-11W,…
  37. HYDROLANT 1219/062006-06-28 → 2006-06-30
    Hydrographic survey in progress until 05 jul by M/V taurus in area bound by 22-07.3S 039-56.8W, 21-56.3S…
  38. HYDROLANT 995/062006-05-23 → 2006-06-17
    Underwater operations 24 may to 16 jun by M/V atalante in area bound by 00-00 000-00, 10-00S 010-00W, 06-00S…
  39. HYDROLANT 541/062006-03-19 → 2006-05-17
    Underwater operations in progress until further notice by M/V leiv eiriksson vicinity 05-48.9S 010-40.0E
  40. HYDROLANT 346/062006-02-18 → 2006-04-10
    Survey operations 0800Z to 2359Z daily 15 feb thru 09 apr by M/V prof
  41. HYDROLANT 2113/052005-11-17 → 2005-11-22
    Underwater operations in progress until 220259Z nov by M/V ocean surveyor in area bound by 20-47.11S…
  42. HYDROLANT 2056/052005-11-09 → 2005-11-17
    Underwater operations in progress until 170259Z nov by M/V ocean surveyor in area bound by 20-47.11S…
  43. HYDROLANT 2019/052005-11-04 → 2005-11-09
    Underwater operations in progress until 090259Z nov by M/V ocean surveyor in area bound by 20-47.11S…
  44. HYDROLANT 1956/052005-10-27 → 2005-11-01
    Underwater operations 290259Z oct to 010259Z nov by M/V ocean surveyor in area bound by 20-47.23S…
  45. HYDROLANT 1937/052005-10-24 → 2005-10-27
    Underwater operations in progress until 290259Z oct by M/V ocean surveyor along trackline joining 20-47.23S…
  46. HYDROLANT 1613/052005-09-05 → 2005-10-01
    Hydrographic survey in progress until 30 sep by M/V le suroit in area bound by 00-00 010-00W, 10-00S…
  47. HYDROLANT 1524/052005-08-21 → 2005-10-05
    Underwater operations in progress until further notice in a. 26-27.17S 014-57.13E
  48. HYDROLANT 1353/052005-07-26 → 2005-07-27
    Survey operations in progress until 300300Z jul by M/V fugro explorer in position 24-37.2S 044-01.0W
  49. HYDROLANT 1313/052005-07-19 → 2005-07-21
    Survey operations in progress until 220300Z jul by M/V fugro explorer in area bound by 11-22.43S 036-56.45W,…
  50. HYDROLANT 1290/052005-07-14 → 2005-07-19
    Survey operations 160300Z to 190300Z jul by M/V fugro explorer in area bound by 11-22.43S 036-56.45W,…

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 41 · seahazards