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 88/242024-01-12 → 2024-01-19
    Underwater operations 1100Z to 2000Z daily 12 thru 19 jan by M/V rei alberto in 24-09.92S 046-13.67W
    Western South Atlantic · Brazil
  2. HYDROLANT 23/242024-01-04 → 2024-01-10
    Underwater operations 1100Z to 2000Z daily 04 thru 10 jan by M/V bravo mar in 24-09.09S 046-12.36W
    Western South Atlantic · Brazil
  3. HYDROLANT 22/242024-01-04 → 2024-01-10
    Underwater operations 1100Z to 2000Z daily 04 thru 10 jan by M/V rei alberto in: a. 24-07.07S 046-15.56W
    Western South Atlantic · Brazil
  4. HYDROLANT 18/242024-01-03 → 2024-02-20
    Survey operations in progress until 01 may by M/V ramform atlas towing 12 five mile long cables in area…
    Eastern South Atlantic
  5. HYDROLANT 10/242024-01-02 → 2024-01-03
    Survey operations in progress until 01 may by M/V ramform atlas towing 12 five mile long cables in area…
    Eastern South Atlantic · Angola · Namibia
  6. HYDROLANT 2986/232023-12-31 → 2024-01-14
    Underwater operations 1100Z to 2100Z daily 31 dec thru 14 jan 24 in 20-23.85S 040-09.63W by M/V irmgard and…
    Western South Atlantic · Brazil
  7. HYDROLANT 2985/232023-12-30 → 2023-12-31
    Underwater operations 1100Z to 2100Z daily 31 dec thru 14 jan 24 by M/V irmgard and M/V comando b in…
    Western South Atlantic · Brazil
  8. HYDROLANT 2976/232023-12-30 → 2024-01-14
    Underwater operations 1100Z to 2100Z daily 31 dec thru 14 jan 24 in 20-23.85S 040-09.63W
    Western South Atlantic · Brazil
  9. HYDROLANT 2950/232023-12-27 → 2024-01-03
    Underwater operations 1100Z to 2000Z daily 27 dec thru 03 jan 24 by M/V bravo mar and M/V rei alberto in: a.…
    Western South Atlantic · Brazil
  10. HYDROLANT 2931/232023-12-22 → 2023-12-31
    Survey operations 230900Z to 310900Z dec in area bound by 25-30.99S 047-26.90W, 25-05.15S 046-47.95W,…
    Western South Atlantic · Brazil
  11. HYDROLANT 2926/232023-12-21 → 2023-12-30
    Underwater operations 1100Z to 2000Z daily 21 thru 30 dec by M/V bravo mar and M/V rei alberto in: a.…
    Western South Atlantic · Brazil
  12. HYDROLANT 2915/232023-12-19 → 2024-01-14
    Survey operations in progress until 13 jan by M/V ramform victory towing ten 8800 meter long cables in area…
    Western South Atlantic · Brazil
  13. HYDROLANT 2909/232023-12-19 → 2023-12-26
    Underwater operations 1100Z to 2000Z daily 19 thru 26 dec by M/V rei alberto in 24-13.27S 046-20.46W
    Western South Atlantic · Brazil
  14. HYDROLANT 2907/232023-12-18 → 2023-12-26
    Survey operations 19 thru 25 dec by M/V siem dorado in area bound by 25-45.00S 042-57.00W, 25-43.00S…
    Western South Atlantic
  15. HYDROLANT 2875/232023-12-13 → 2023-12-21
    Underwater operations 1100Z to 2000Z daily 14 thru 21 dec by M/V rei alberto in: a. 24-08.88S 046-14.63W
    Western South Atlantic · Brazil
  16. HYDROLANT 2861/232023-12-12 → 2023-12-19
    Underwater operations 1100Z to 2000Z daily 12 thru 19 dec by M/V rei alberto in 24-10.01S 046-15.35W
    Western South Atlantic · Brazil
  17. HYDROLANT 2846/232023-12-09 → 2023-12-19
    Survey operations in progress until 18 dec by M/V siem dorado in area bound by 25-43.00S 042-57.00W,…
    Western South Atlantic
  18. HYDROLANT 2827/232023-12-07 → 2023-12-14
    Underwater operations 1100Z to 2000Z daily 07 thru 14 dec in 24-10.14S 046-19.51W
    Western South Atlantic · Brazil
  19. HYDROLANT 2824/232023-12-06 → 2023-12-14
    Survey operations 070700 to 141800Z dec by M/V avpq aspirante moura in area bound by 23-03.12S 041-54.65W,…
    Western South Atlantic · Brazil
  20. HYDROLANT 2823/232023-12-06 → 2023-12-14
    Underwater operations 1100Z to 2000Z daily 06 thru 14 dec in: a. 24-08.45S 046-10.59W
    Western South Atlantic · Brazil
  21. HYDROLANT 2813/232023-12-05 → 2023-12-11
    Underwater operations 1100Z to 2000Z daily 04 thru 11 dec by M/V rei alberto in: a. 24-09.14S 046-15.84W
    Western South Atlantic · Brazil
  22. HYDROLANT 2806/232023-12-05 → 2024-02-24
    Survey operations in progress until further notice by M/V bgp prospector towing ten 8000 meter long cables…
    Western South Atlantic
  23. HYDROLANT 2796/232023-12-04 → 2023-12-09
    Underwater operations 05 thru 08 dec by M/V starnav hydra in 21-48.48S 040-50.90W
    Western South Atlantic · Brazil
  24. HYDROLANT 2795/232023-12-04 → 2023-12-09
    Underwater operations 1100Z to 2000Z daily 04 thru 09 dec by M/V rei alberto in: a. 24-08.47S 046-11.06W
    Western South Atlantic · Brazil
  25. HYDROLANT 2774/232023-12-01 → 2023-12-16
    Survey operations in progress until 15 dec by M/V ramform victory towing ten 9000 meter long cables in area…
    Western South Atlantic · Brazil
  26. HYDROLANT 2760/232023-11-30 → 2024-04-18
    Underwater operations 011100Z dec to 182000Z apr 24 in 21-50.28S 040-47.80W
    Western South Atlantic · Brazil
  27. HYDROLANT 2752/232023-11-29 → 2023-12-04
    Underwater operations 1100Z to 2000Z daily 29 nov thru 09 dec by M/V rei alberto in: a. 24-04.15S 046-19.85W
    Western South Atlantic · Brazil
  28. HYDROLANT 2751/232023-11-29 → 2023-12-14
    Underwater operations 1100Z to 2100Z daily 30 nov thru 14 dec by M/V suzanna and M/V comando b in 20-20.52S…
    Western South Atlantic · Brazil
  29. HYDROLANT 2740/232023-11-28 → 2023-12-05
    Survey operations in progress until 04 dec by M/V siem dorado in area bound by 25-43.00S 042-57.00W,…
    Western South Atlantic
  30. HYDROLANT 2738/232023-11-27 → 2024-01-19
    Survey operations 01 dec until further notice by M/V amazon conqueror towing 12 8000 meter long streamers in…
    Eastern South Atlantic
  31. HYDROLANT 2725/232023-11-25 → 2023-12-01
    Survey operations in progress until 30 nov by M/V ramform victory towing ten 9000 meter long cables in area…
    Western South Atlantic · Brazil
  32. HYDROLANT 2718/232023-11-25 → 2023-11-30
    Underwater operations in progress until further notice by c/s it intrepid in 23-27.00S 041-44.00W
    Western South Atlantic · Brazil
  33. HYDROLANT 2654/232023-11-18 → 2023-11-30
    Underwater operations in progress daily 1100Z to 2000Z thru 30 nov by M/V rei alberto and M/V sereno in: a.…
    Western South Atlantic · Brazil
  34. HYDROLANT 2651/232023-11-18 → 2023-11-18
    Underwater operations in progress daily 1100Z to 2000Z thru 30 nov by M/V rei alberto and M/V sereno in a.…
    Western South Atlantic · Brazil
  35. HYDROLANT 2650/232023-11-18 → 2023-11-25
    Underwater operations daily 1100Z to 2000Z 18 thru 25 nov by M/V rei alberto and M/V bravo mar in: a.…
    Western South Atlantic · Brazil
  36. HYDROLANT 2612/232023-11-15 → 2023-11-20
    Survey operations in progress until 19 nov by vessel M/V artemis odyssey in area bound by 25-45.50S…
    Western South Atlantic
  37. HYDROLANT 2580/232023-11-11 → 2023-11-21
    Survey operations in progress until 20 nov by M/V ramform victory towing ten 8000 meter long cables in area…
    Western South Atlantic · Brazil
  38. HYDROLANT 2552/232023-11-08 → 2023-11-09
    Underwater operations 0800Z to 1700Z daily 08 and 09 nov by vessel anna guerra in 22-58.36S 043-48.39W
    Western South Atlantic · Brazil
  39. HYDROLANT 2494/232023-11-01 → 2023-11-11
    Underwater operations 02 thru 10 nov by M/V draga ham 306 and M/V reb c temporal in area bound by 24-06.08S…
    Western South Atlantic · Brazil
  40. HYDROLANT 2471/232023-10-30 → 2023-11-07
    Survey operations in progress until 06 nov by M/V artemis odyssey in area bound by 25-43.41S 042-57.27W,…
    Western South Atlantic
  41. HYDROLANT 2470/232023-10-30 → 2023-11-07
    Survey operations in progress until 06 nov by M/V siem dorado in area bound by 25-43.00S 042-57.00W,…
    Western South Atlantic
  42. HYDROLANT 2440/232023-10-25 → 2023-11-02
    Survey operations in progress until 01 nov by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  43. HYDROLANT 2425/232023-10-24 → 2023-10-31
    Survey operations in progress until 30 oct by M/V artemis odyssey in area bound by 25-45.50S 042-57.61W,…
    Western South Atlantic
  44. HYDROLANT 2414/232023-10-23 → 2023-10-25
    Survey operations in progress until 30 oct by M/V ramform tethys in area bound by 26-59.56S 046-39.27W,…
    Western South Atlantic · Brazil
  45. HYDROLANT 2388/232023-10-20 → 2023-10-31
    Survey operations in progress until 30 oct by M/V ramform tethys in area bound by 27-14.59S 047-06.48W,…
    Western South Atlantic · Brazil
  46. HYDROLANT 2377/232023-10-19 → 2023-10-24
    Survey operations in progress until 23 oct by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  47. HYDROLANT 2361/232023-10-18 → 2023-10-25
    Survey operations in progress until 24 oct by M/V sw duchess in area bound by 24-50.17S 042-46.60W,…
    Western South Atlantic
  48. HYDROLANT 2352/232023-10-17 → 2023-10-24
    Survey operations in progress until 27 oct by M/V artemis odyssey in area bound by 25-45.50S 042-57.61W,…
    Western South Atlantic
  49. HYDROLANT 2339/232023-10-16 → 2023-10-17
    Survey operations 17 thru 23 oct by M/V artemis odyssey in area bound by 25-45.50S 042-57.61W, 25-43.41S…
    Western South Atlantic
  50. HYDROLANT 2313/232023-10-12 → 2023-10-17
    Survey operations 1100Z to 2100Z daily 11 thru 17 oct by M/V sw duches in area bound by 24-49.13S…
    Western South Atlantic

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 2 · seahazards