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 1971/192019-06-29 → 2019-07-30
    Underwater operations 1100Z to 2000Z daily 30 jun thru 30 jul by M/V nm sinokor sunrise in 20-22.87S…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 1970/192019-06-29 → 2019-07-30
    Underwater operations 1100Z to 2000Z daily 30 jun thru 30 jul by M/V mc pyxis ocean in 20-22.92S 040-11.63W
    Western South Atlantic · Brazil-southeast Coast
  3. HYDROLANT 1969/192019-06-29 → 2019-07-30
    Underwater operations 1100Z to 2000Z daily 30 jun thru 30 jul by M/V federal yamaska and M/V proboat in…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 1968/192019-06-29 → 2019-07-30
    Underwater operations 1100Z to 2000Z daily 30 jun thru 30 jul by M/V ines corrado in 20-22.93S 040-14.33W
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 1967/192019-06-29 → 2019-06-30
    Underwater operations in progress 1100Z to 2000Z daily until 31 aug by M/V sbi lambada, M/V zatto and M/V…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 1919/192019-06-27 → 2019-07-05
    Survey operations in progress until 04 jul by M/V subsea viking in area bound by 24-38.28S 042-42.47W,…
    Western South Atlantic · Brazil-south Coast
  7. HYDROLANT 1918/192019-06-27 → 2019-07-05
    Survey operations in progress until 04 jul by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  8. HYDROLANT 1917/192019-06-27 → 2019-07-05
    Survey operations in progress until 04 jul by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  9. HYDROLANT 1913/192019-06-26 → 2019-07-07
    Survey operations in progress until 06 jul by M/V geo caribbean towing 12 10372 meter long cables in area…
    Western South Atlantic
  10. HYDROLANT 1892/192019-06-24 → 2019-06-28
    Survey operations in progress until 27 jun by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  11. HYDROLANT 1849/192019-06-20 → 2019-07-01
    Survey operation in progress until 15 dec by M/V ramform sovereign towing 3600 meter long cables in area…
    Eastern South Atlantic · Angola
  12. HYDROLANT 1847/192019-06-20 → 2019-07-31
    Underwater operations 1100Z to 2000Z daily 21 jun thru 31 jul by M/V mineral brussel, M/V zatto and M/V…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 1846/192019-06-20 → 2019-07-31
    Underwater operations 1100Z to 2000Z daily 21 jun thru 31 jul by M/V achilleas s, M/V zatto and M/V comando…
    Western South Atlantic · Brazil-southeast Coast
  14. HYDROLANT 1845/192019-06-20 → 2019-06-27
    Survey operations in progress until 27 jun by M/V subsea viking in area bound by 24-38.28S 042-42.47W,…
    Western South Atlantic · Brazil-south Coast
  15. HYDROLANT 1836/192019-06-19 → 2019-06-29
    Underwater operations 20 jun thru 10 jul by M/V berge vinson and M/V proboat in 20-24.25S 040-12.22W
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 1798/192019-06-15 → 2019-07-04
    Underwater operations 1100Z to 2000Z daily 15 jun thru 04 jul by M/V saga tide and M/V proboat in 20-22.60S…
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 1777/192019-06-13 → 2019-06-20
    Underwater operations in progress until 200259Z jun by M/V subsea viking in area bound by 24-40.95S…
    Western South Atlantic · Brazil-south Coast
  18. HYDROLANT 1776/192019-06-13 → 2019-06-21
    Survey operations in progress until 20 jun by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  19. HYDROLANT 1774/192019-06-13 → 2019-06-15
    Underwater operations in progress 1100Z to 2000Z daily until 31 jul by M/V marathasa, M/V zatto and M/V…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 1757/192019-06-11 → 2019-07-31
    Underwater operations 1100Z to 2000Z daily 11 jun thru 31 jul by M/V copernicus n, M/V zatto and M/V comando…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 1747/192019-06-08 → 2019-06-18
    Survey operations 09 thru 17 jun by M/V hai yang shi you 720 towing ten 900 meter long cables in areas bound…
    Western South Atlantic
  22. HYDROLANT 1733/192019-06-07 → 2019-06-14
    Survey operations 06 thru 13 jun by M/V vantage towing six 155 meter long cables in area bound by 24-47.53S…
    Western South Atlantic
  23. HYDROLANT 1729/192019-06-06 → 2019-06-20
    Survey operations in progress until 19 jun by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  24. HYDROLANT 1693/192019-06-02 → 2019-07-31
    Underwater operations 1100Z to 2000Z daily 04 jun thru 31 jul by M/V interlink acuit, M/V zatto and M/V…
    Western South Atlantic · Brazil-southeast Coast
  25. HYDROLANT 1689/192019-06-02 → 2019-06-21
    Underwater operations 0800Z to 2300Z daily 03 thru 20 jun by tug sentosa, barge smitbarge 1 and M/V corenav…
    Western South Atlantic · Brazil-north Coast
  26. HYDROLANT 1660/192019-05-31 → 2019-06-14
    Survey operations in progress until 13 jun by M/V subsea viking in area bound by 24-42S 042-40W, 24-53S…
    Western South Atlantic · Brazil-south Coast
  27. HYDROLANT 1658/192019-05-31 → 2019-06-07
    Survey operations in progress until 06 jun by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  28. HYDROLANT 1657/192019-05-31 → 2019-06-07
    Survey operations in progress until 06 jun by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  29. HYDROLANT 1656/192019-05-30 → 2019-07-30
    Underwater operations 1100Z to 2000Z daily 01 jun thru 30 jul by M/V sammy, M/V zatto and M/V comando b in…
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 1632/192019-05-29 → 2019-05-30
    Underwater operations 1100Z to 2000Z daily 30 may thru 30 jul by M/V beks halil, M/V zatto and M/V comando b…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 1631/192019-05-29 → 2019-07-30
    Underwater operations 1100Z to 2000Z daily 30 may thru 30 jul by M/V miltiades II, M/V zatto and M/V comando…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 1571/192019-05-24 → 2019-05-25
    Survey operations in progress until 251200Z may by M/V nhi sirius in area bound by 25-25.10S 047-52.30W,…
    Western South Atlantic · Brazil-south Coast
  33. HYDROLANT 1569/192019-05-24 → 2019-05-31
    Survey operations in progress until 30 may by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  34. HYDROLANT 1557/192019-05-23 → 2019-06-02
    Survey operations 24 may thru 01 jun by M/V hai yang shi you 720 towing ten 900 meter long cables in areas…
    Western South Atlantic
  35. HYDROLANT 1552/192019-05-23 → 2019-08-24
    Underwater operations in progress until 23 aug by M/V rebocador, M/V ts alucinante and M/V balsa piata in…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 1542/192019-05-22 → 2019-05-31
    Survey operations 23 thru 30 may by M/V vantage towing six 155 meter long cables in area bound by 24-49.20S…
    Western South Atlantic · Brazil-south Coast
  37. HYDROLANT 1541/192019-05-22 → 2019-05-30
    Survey operations in progress until 29 may by M/V subsea viking in area bound by 24-53.90S 042-34.03W,…
    Western South Atlantic · Brazil-south Coast
  38. HYDROLANT 1525/192019-05-19 → 2019-06-20
    Survey operations in progress until further notice by M/V ramform sovereign towing 3600 meter long cables in…
    Eastern South Atlantic
  39. HYDROLANT 1520/192019-05-19 → 2019-06-30
    Underwater operations 1100Z to 2000Z daily 20 may thru 30 jun in 20-23.10S 040-10.28W by M/V sea victory,…
    Western South Atlantic · Southeast Coast · Brazil
  40. HYDROLANT 1513/192019-05-17 → 2019-05-24
    Survey operations in progress until 23 may by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  41. HYDROLANT 1497/192019-05-16 → 2019-08-02
    Scientific buoys established in: a. 23-00.09S 012-23.66E
    Eastern South Atlantic · Namibia
  42. HYDROLANT 1496/192019-05-16 → 2019-05-19
    Survey operations in progress until further notice by M/V ramform sovereign towing 3600 meter long cables in…
    Eastern South Atlantic
  43. HYDROLANT 1494/192019-05-16 → 2019-05-24
    Survey operations in progress until 23 may by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 1491/192019-05-16 → 2019-05-23
    Survey operations in progress until 22 may by M/V subsea viking in area bound by 24-43.17S 042-39.75W,…
    Western South Atlantic · Brazil-south Coast
  45. HYDROLANT 1461/192019-05-13 → 2019-05-16
    Survey operations in progress until further notice by M/V ramform sovereign towing 3600 meter long cables in…
    Eastern South Atlantic · Angola
  46. HYDROLANT 1449/192019-05-12 → 2019-06-15
    Underwater operations 1100Z to 2000Z daily 13 may thru 20 jun by M/V federal and M/V proboat in 20-18.27S…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 1426/192019-05-10 → 2019-05-16
    Survey operations in progress until 17 may by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 1417/192019-05-09 → 2019-05-17
    Survey operations in progress until 16 may by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  49. HYDROLANT 1408/192019-05-07 → 2019-05-13
    Survey operations in progress until further notice by M/V ramform sovereign towing 3600 meter long cables in…
    Eastern South Atlantic
  50. HYDROLANT 1405/192019-05-07 → 2019-05-17
    Survey operations in progress until 16 may by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast

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 21 · seahazards