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 · 176 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 1625/262026-08-20 → 2026-08-20
    Underwater operations daily from 21 August to 4 September by two vessels at 20-23.95S 040-10.83W in the South Atlantic, wide berth requested.
    South Atlantic · Brazil
  2. HYDROLANT 1621/262026-08-20 → 2026-08-20
    Vessel NOMAR is conducting underwater operations daily until 25 August at 24-07.27S 046-09.30W off Brazil in the South Atlantic. Wide berth requested.
    South Atlantic · Brazil
  3. HYDROLANT 1620/262026-08-19 → 2026-08-20
    Survey operations in the South Atlantic by vessel Sea 1 Dorado until 24 August, wide berth requested.
    South Atlantic
  4. HYDROLANT 1619/262026-08-19 → 2026-08-20
    Underwater operations are underway until 280259Z August by vessel Siem Pilot at 24-35.02S 042-15.37W; wide berth requested.
    South Atlantic
  5. HYDROLANT 1616/262026-08-19 → 2026-08-19
    Underwater operations daily 20 Aug through 03 Sep by vessels Charlie and Comando B in 20-24.27S 040-09.57W, wide berth requested.
    South Atlantic · Brazil
  6. HYDROLANT 1615/262026-08-19 → 2026-08-19
    Underwater operations daily from 20 August to 3 September, 1100 to 2100 UTC, by vessels Comando B and Linden Trader at 20-22.98S 040-08.73W. Wide berth requested.
    South Atlantic · Brazil
  7. HYDROLANT 1614/262026-08-19 → 2026-08-19
    Underwater operations by vessels Hui An and Comando B are ongoing daily from 20 August to 3 September in South Atlantic, Brazil, at 20-23.17S 040-10.02W, wide berth requested.
    South Atlantic · Brazil
  8. HYDROLANT 1600/262026-08-18 → 2026-08-19
    Underwater operations are conducted daily from 0800 UTC to 1800 UTC until 28 August by vessels Spar Aries and Comando B at 20-48.85S 040-27.23W; wide berth requested.
    South Atlantic · Brazil
  9. HYDROLANT 1599/262026-08-18 → 2026-08-19
    Underwater operations by vessels Comando B and AM Kirti occur daily 0800Z to 1800Z until 29 August at 20-19.03S 040-08.77W; wide berth requested.
    South Atlantic · Brazil
  10. HYDROLANT 1592/262026-08-17 → 2026-08-19
    Underwater operations by vessels Spar Aries and Comando B occur daily from 1100Z to 2100Z, 18-28 August, at 20-48.85S 040-27.23W, wide berth requested.
    South Atlantic · Brazil
  11. HYDROLANT 1582/262026-08-15 → 2026-08-19
    Underwater operations are conducted daily from 0800 to 1800, 16-30 August, by ships White Defender and Comando B near 20-26.83S 040-08.73W; wide berth requested.
    South Atlantic · Brazil
  12. HYDROLANT 1578/262026-08-15 → 2026-08-19
    Vessels Moonbeam and Comando B are conducting underwater operations near 20-21.82S 040-08.98W, Brazil, from August 15 08:00 UTC to August 29 18:00 UTC; a wide berth is requested.
    South Atlantic · Brazil
  13. HYDROLANT 2098/242024-10-02 → 2026-08-17
    Survey operations in progress until 13 oct by M/V ocean mermaid, M/V ramform victory, M/V pgs apollo and M/V…
    Western South Atlantic · Brazil
  14. HYDROLANT 2097/242024-10-02 → 2026-08-17
    Underwater operations in progress until 31 oct by M/V puerto real in area bound by 21-42.73S 039-46.36W,…
    Western South Atlantic · Brazil
  15. HYDROLANT 2094/242024-10-01 → 2026-08-17
    Survey operations in progress until 07 oct by M/V artemis odyssey towing six 186 meter cables in area bound…
    Western South Atlantic
  16. HYDROLANT 2018/242024-09-17 → 2026-08-17
    Survey operations in progress until further notice by M/V ramform tethys towing ten two mile long cables in…
    Eastern South Atlantic · Angola
  17. HYDROLANT 1074/242024-05-21 → 2026-08-17
    Survey operations in progress until 23 nov by M/V siem dorado in area bound by 24-59.67S 042-32.90W,…
    Western South Atlantic
  18. HYDROLANT 942/242024-05-03 → 2024-07-03
    Survey operations in progress until 02 jul by M/V atlantic guardian in area bound by 20-20.58S 038-21.07W,…
    Western South Atlantic · Brazil
  19. HYDROLANT 846/242024-04-21 → 2024-05-20
    Underwater operations in progress until 19 may in 23-04.0S 043-02.5W
    Western South Atlantic · Brazil
  20. HYDROLANT 815/242024-04-17 → 2024-05-09
    Survey operations 17 apr thru 08 may by M/V artemis odyssey in area bound by 25-04.49S 042-10.72W, 25-05.99S…
    Western South Atlantic
  21. HYDROLANT 803/242024-04-16 → 2024-04-25
    Underwater operations 0500Z to 2000Z daily 16 thru 25 apr by M/V double diamond and M/V novo estado in…
    Western South Atlantic · Brazil
  22. HYDROLANT 797/242024-04-15 → 2024-04-30
    Underwater operations 1200Z to 1700Z daily 15 thru 30 apr by M/V future and M/V open seas I in 20-22.10S…
    Western South Atlantic · Brazil
  23. HYDROLANT 743/242024-04-09 → 2026-08-14
    Survey operations are in progress by M/V PXGEO 2 towing ten 8100-meter cables in the western South Atlantic; seven-mile berth requested.
    Western South Atlantic
  24. HYDROLANT 723/242024-04-06 → 2024-05-05
    Underwater operations 1100Z to 2000Z daily 06 apr thru 05 may in 24-07.11S 046-08.76W
    Western South Atlantic · Brazil
  25. HYDROLANT 686/242024-04-03 → 2024-05-01
    Survey operations in progress until 30 apr by M/V ramform victory towing ten 8800 meter long cables in area…
    Western South Atlantic · Brazil
  26. HYDROLANT 574/242024-03-19 → 2024-04-23
    Survey operations in progress until 232000Z apr by M/V geo resolution in area bound by 22-48.20S 041-12.80W,…
    Western South Atlantic · Brazil
  27. HYDROLANT 550/242024-03-16 → 2024-04-24
    Survey operations in progress until 241000Z apr by M/V taurus in area bound by 06-56.53S 034-49.48W,…
    Western South Atlantic · Brazil
  28. HYDROLANT 515/242024-03-13 → 2024-04-09
    Survey operations in progress until further notice by M/V pxgeo 2 towing ten 8100 meter long cabes in area…
    Western South Atlantic
  29. HYDROLANT 467/242024-03-07 → 2024-04-01
    Survey operations in progress until 31 mar by M/V ramform victory towing ten 8800 meter long cables in area…
    Western South Atlantic · Brazil
  30. HYDROLANT 450/242024-03-05 → 2024-03-09
    Survey operations in progress until 092100Z mar by M/V taurus in area bound by 06-50.45S 034-45.38W,…
    Western South Atlantic · Brazil
  31. HYDROLANT 444/242024-03-04 → 2026-08-14
    Survey operations by vessel BGP Prospector towing 12 cables of 7000 meters in western South Atlantic off Argentina, 7 mile berth requested.
    Western South Atlantic · Argentina
  32. HYDROLANT 426/242024-03-02 → 2024-03-12
    Survey operations in progress until 11 mar by M/V artemis odyssey in area bound by 25-04.49S 042-10.72W,…
    Western South Atlantic
  33. HYDROLANT 417/242024-02-28 → 2024-03-26
    Underwater operations 1100Z to 2000Z daily 28 feb thru 26 mar by M/V big john VI, M/V rodrigo neto I and M/V…
    Western South Atlantic · Brazil
  34. HYDROLANT 402/242024-02-27 → 2024-03-07
    Underwater operations 261900Z feb to 071200Z mar by M/V rebecca in area bound by 33-03.07S 047-27.95W,…
    Western South Atlantic
  35. HYDROLANT 387/242024-02-24 → 2024-03-19
    Survey operations in progress until 192000Z mar by M/V geo resolution in areas bound by: a. 22-09.44S…
    Western South Atlantic · Brazil
  36. HYDROLANT 386/242024-02-24 → 2024-03-04
    Survey operations in progress until further notice by m\v bgp prospector towing 12 8100 meter long cables in…
    Western South Atlantic · Argentina
  37. HYDROLANT 360/242024-02-20 → 2026-08-14
    Survey operations are in progress in the eastern South Atlantic by the vessel Ramform Atlas towing twelve 8000-meter cables; an eight-mile berth is requested.
    Eastern South Atlantic
  38. HYDROLANT 353/242024-02-19 → 2024-04-10
    Survey operations in progress until further notice by M/V amazon conqueror towing 12 8000 meter long cables…
    Eastern South Atlantic
  39. HYDROLANT 323/242024-02-16 → 2024-03-02
    Survey operations in progress until 01 mar by M/V ramform victory towing ten 8800 meter long cables in area…
    Western South Atlantic · Brazil
  40. HYDROLANT 320/242024-02-16 → 2024-02-17
    Underwater operations 1100Z to 2100Z daily 16 and 17 feb in 20-22.67S 040-08.20W
    Western South Atlantic · Brazil
  41. HYDROLANT 295/242024-02-11 → 2024-02-20
    Survey operations 12 thru 19 feb by M/V siem dorado along trackline joining 25-22.60S 042-32.10W, 25-18.62S…
    Western South Atlantic · Brazil
  42. HYDROLANT 269/242024-02-08 → 2024-03-07
    Underwater operations in progress until 072000Z mar in 24-09.24S 046-12.68W
    Western South Atlantic · Brazil
  43. HYDROLANT 264/242024-02-07 → 2024-03-06
    Underwater operations 071100Z feb to 062000Z mar in 24-10.04S 046-14.53W
    Western South Atlantic · Brazil
  44. HYDROLANT 257/242024-02-06 → 2024-02-16
    Survey operations in progress until 15 feb by M/V ramform victory towing ten 8800 meter cables in area bound…
    Western South Atlantic · Brazil
  45. HYDROLANT 181/242024-01-24 → 2024-02-01
    Underwater operations 1100Z to 2000Z daily 25 jan thru 01 feb in 24-10.04S 046-14.53W
    Western South Atlantic · Brazil
  46. HYDROLANT 154/242024-01-19 → 2024-02-19
    Survey operations in progress until further notice by M/V amazon conqueror towing 12 8000 meter long cables…
    Eastern South Atlantic
  47. HYDROLANT 153/242024-01-19 → 2024-01-26
    Underwater operations 1100Z to 2000Z daily 19 thru 26 jan in 24-10.04S 046-14.53W
    Western South Atlantic · Brazil
  48. HYDROLANT 152/242024-01-19 → 2024-01-27
    Underwater operations 1100Z to 2000Z daily 19 thru 27 jan in 24-10.51S 046-30.84W
    Western South Atlantic · Brazil
  49. HYDROLANT 151/242024-01-19 → 2024-01-27
    Underwater operations 1100Z to 2000Z daily 20 thru 27 jan in 24-09.92S 046-13.67W
    Western South Atlantic · Brazil
  50. HYDROLANT 117/242024-01-15 → 2024-02-01
    Survey operations in progress until 31 jan by vessel M/V ramform victory towing ten 8800 meter long cables…
    Western South Atlantic · Brazil

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 · seahazards