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 2311/232023-10-12 → 2023-12-05
    Survey operations in progress until further notice by M/V bgp prospector towing ten 8000 meter long cables…
    Western South Atlantic
  2. HYDROLANT 2296/232023-10-10 → 2023-12-11
    Survey operations in progress until further notice by sw empress towing cables in area bound by 28-00.06S…
    Eastern South Atlantic · Namibia
  3. HYDROLANT 2294/232023-10-10 → 2023-10-17
    Survey operations in progress until 16 oct by M/V siem dorado in area bound by 25-43.00S 042-57.00W,…
    Western South Atlantic
  4. HYDROLANT 2293/232023-10-10 → 2023-10-11
    Survey operations in progress by M/V sw duchess in area bound by 25-08.72S 042-32.59W, 24-49.08S 042-45.54W,…
    Western South Atlantic
  5. HYDROLANT 2274/232023-10-07 → 2023-10-10
    Survey operations in progress until 09 oct by M/V sw duchess in area bound by 25-08.00S 042-32.06W,…
    Western South Atlantic
  6. HYDROLANT 2273/232023-10-07 → 2023-10-10
    Survey operations in progress until 09 oct by M/V siem dorado in area bound by 25-43.00S 042-57.00W,…
    Western South Atlantic
  7. HYDROLANT 2245/232023-10-03 → 2023-10-10
    Survey operations in progress until 09 oct by M/V artemis odyssey in area bound by 25-45.50S 042-57.61W,…
    Western South Atlantic
  8. HYDROLANT 2244/232023-10-03 → 2023-10-18
    Survey operations in progress until 17 oct by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  9. HYDROLANT 2228/232023-10-02 → 2023-10-04
    Survey operations on 03 oct by M/V sw duchess in area bound by 25-09.18S 042-32.89W, 24-49.14S 042-46.09W,…
    Western South Atlantic
  10. HYDROLANT 2195/232023-09-29 → 2023-10-03
    Survey operations 30 sep thru 02 oct by M/V sw duchess in area bound by 24-49.17S 042-45.18W, 25-08.56S…
    Western South Atlantic
  11. HYDROLANT 2174/232023-09-27 → 2023-09-30
    Survey operations in progress until 29 sep by M/V sw duchess in area bound by 24-49.15S 042-44.19W,…
    Western South Atlantic
  12. HYDROLANT 2154/232023-09-25 → 2023-10-03
    Survey operations 26 sep thru 02 oct by M/V siem dorado in area bound by 25-43.00S 042-57.00W, 25-45.00S…
    Western South Atlantic
  13. HYDROLANT 2153/232023-09-25 → 2023-09-27
    Survey operations in progress until 26 sep by M/V sw duchess in area bound by 25-08.48S 042-32.45W,…
    Western South Atlantic
  14. HYDROLANT 2132/232023-09-22 → 2023-09-25
    Survey operations 23 thru 25 sep by M/V sw duchess in area bound by 24-49.06S 042-44.66W, 24-49.06S…
    Western South Atlantic
  15. HYDROLANT 2121/232023-09-21 → 2023-09-26
    Survey operations in progress until 25 sep by M/V w tupan I in area bound by 21-51.02S 039-48.26W, 21-50.64S…
    Western South Atlantic · Brazil
  16. HYDROLANT 2116/232023-09-20 → 2023-10-03
    Survey operations in progress until 03 oct by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  17. HYDROLANT 2111/232023-09-20 → 2023-09-24
    Survey operations in progress until 23 sep by M/V sw duchess in area bound by 24-49.05S 042-43.26W,…
    Western South Atlantic
  18. HYDROLANT 2101/232023-09-19 → 2023-09-20
    Survey operations in progress until 192359Z sep by M/V sw duchess in area bound by 24-49.15S 042-44.00W,…
    Western South Atlantic
  19. HYDROLANT 2100/232023-09-19 → 2023-09-26
    Survey operations in progress until 25 sep by M/V siem dorado in area bound by 25-45.00S 042-57.00W,…
    Western South Atlantic
  20. HYDROLANT 2079/232023-09-16 → 2023-09-19
    Survey operations in progress until 18 sep by M/V sw duchess in area bound by 25-07.50S 042-30.80W,…
    Western South Atlantic
  21. HYDROLANT 2066/232023-09-15 → 2023-09-22
    Underwater operations 1100Z to 2000Z DAILY15 thru 22 sep by M/V rei alberto in 24-11.59S 046-21.20W
    Western South Atlantic · Brazil
  22. HYDROLANT 2055/232023-09-13 → 2023-09-16
    Survey operations in progress until 15 sep by M/V sw duchess in area bound by 25-07.49S 042-29.41W,…
    Western South Atlantic
  23. HYDROLANT 2049/232023-09-12 → 2023-09-19
    Survey operations in progress until 18 sep by M/V siem dorado in area bound by 25-43.00S 042-57.00W,…
    Western South Atlantic
  24. HYDROLANT 2012/232023-09-07 → 2023-09-14
    Underwater operations 1100Z to 2000Z 07 thru 14 sep in 24-13.88S 046-19.78W
    Western South Atlantic · Brazil
  25. HYDROLANT 1991/232023-09-04 → 2023-09-20
    Survey operations in progress until 19 sep by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  26. HYDROLANT 1982/232023-09-04 → 2023-09-06
    Survey operations in progress until 05 sep by M/V sw duchess in area bound by 25-07.48S 042-30.00W,…
    Western South Atlantic
  27. HYDROLANT 1961/232023-09-01 → 2023-09-05
    Survey operations 02 thru 04 sep by M/V sw duchess in area bound by 24-49.11S 042-42.02W, 24-49.10S…
    Western South Atlantic
  28. HYDROLANT 1948/232023-08-30 → 2024-01-24
    Underwater operations in progress until 242100Z jan 24 by M/V bold maverick in area bound by 23-02.71S…
    Western South Atlantic · Brazil
  29. HYDROLANT 1945/232023-08-30 → 2023-09-02
    Survey operations in progress until 02 sep by M/V sw duchess in area bound by 25-07.44S 042-27.83W,…
    Western South Atlantic
  30. HYDROLANT 1943/232023-08-29 → 2023-09-06
    Underwater operations 1100Z to 2000Z daily 30 aug thru 06 sep by M/V rei alberto in area bound by 24-08.84S…
    Western South Atlantic · Brazil
  31. HYDROLANT 1932/232023-08-29 → 2023-09-04
    Survey operations in progress until 12 sep by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  32. HYDROLANT 1894/232023-08-24 → 2023-09-05
    Survey operations in progress until 04 sep by M/V siem dorado in area bound by 25-43.00S 042-57.00W,…
    Western South Atlantic
  33. HYDROLANT 1869/232023-08-21 → 2023-08-30
    Underwater operations in progress until 242100Z jan 24 by M/V bold maverick in area bound by 23-02.71S…
    Western South Atlantic · Brazil
  34. HYDROLANT 1862/232023-08-21 → 2023-08-29
    Survey operations in progress until 30 aug by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  35. HYDROLANT 1806/232023-08-15 → 2023-08-21
    Underwater operations in progress until 242200Z jan 24 in area bound by 23-02.71S 043-29.21W, 24-02.62S…
    Western South Atlantic · Brazil
  36. HYDROLANT 1787/232023-08-12 → 2023-09-21
    Survey operations in progress until further notice by M/V sw empress towing 7000 meter long cables in area…
    Eastern South Atlantic · Congo (brazzaville)
  37. HYDROLANT 1783/232023-08-12 → 2023-08-15
    Underwater operations 130900Z aug to 242200Z jan 24 in area bound by 24-05.90S 043-29.21W, 24-05.90S…
    Western South Atlantic · Brazil
  38. HYDROLANT 1757/232023-08-08 → 2026-08-14
    Survey operations are underway in the western South Atlantic near Brazil until August 20, with the vessel Ramform Tethys towing twelve 8000-meter cables.
    Western South Atlantic · Brazil
  39. HYDROLANT 1719/232023-08-03 → 2023-08-10
    Underwater operations 1100Z to 2000Z daily 03 thru 10 aug in: a. 24-09.48S 046-14.61W
    Western South Atlantic · Brazil
  40. HYDROLANT 1704/232023-07-31 → 2023-08-08
    Survey operations in progress until 09 aug by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  41. HYDROLANT 1624/232023-07-19 → 2023-07-26
    Survey operations in progress until 25 jul by M/V sw duchess in area bound by 24-45.07S 042-35.53W,…
    Western South Atlantic
  42. HYDROLANT 1598/232023-07-15 → 2023-07-30
    Survey operations in progress until 29 jul by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  43. HYDROLANT 1581/232023-07-14 → 2023-07-21
    Survey operations in progress until 20 jul by M/V siem dorado in area bound by 25-23.00S 044-42.00W,…
    Western South Atlantic
  44. HYDROLANT 1567/232023-07-11 → 2023-07-18
    Survey operations in progress until 17 jul by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  45. HYDROLANT 1517/232023-07-06 → 2023-07-17
    Underwater operations 1100Z to 2000Z daily 06 thru 17 jul by M/V poseidon in 24-08.09S 046-10.29W
    Western South Atlantic · Brazil
  46. HYDROLANT 1501/232023-07-04 → 2023-07-11
    Survey operations in progress until 10 jul by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  47. HYDROLANT 1484/232023-07-01 → 2023-07-07
    Underwater operations in progress until 31 dec by M/V draga volzee in area bound by 02-25.00S 042-18.00W,…
    Western South Atlantic · Brazil
  48. HYDROLANT 1396/232023-06-23 → 2023-07-04
    Survey operations in progress thru 03 jul by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  49. HYDROLANT 1385/232023-06-22 → 2023-06-29
    Underwater operations 1100Z to 2000Z daily 22 thru 29 jun by M/V rei alberto in 24-08.54S 046-11.02W
    Western South Atlantic · Brazil
  50. HYDROLANT 1310/232023-06-12 → 2023-06-21
    Underwater operations daily 1100Z to 2000Z 13 thru 21 jun by M/V rei alberto in a. 24-10.37S 046-13.01W
    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 — page 3 · seahazards