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 1309/232023-06-12 → 2023-06-22
    Survey operations in progress thru 21 jun by M/V ramform tethys towing 12 8000 meter long cables in area…
    Western South Atlantic · Brazil
  2. HYDROLANT 1251/232023-06-06 → 2023-06-13
    Survey operations in progress until 12 jun by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  3. HYDROLANT 1238/232023-06-03 → 2023-06-10
    Underwater operations 1100Z to 2000Z daily 03 thru 10 jun by M/V rei alberto in 24-13.22S 046-13.94W
    Western South Atlantic · Brazil
  4. HYDROLANT 1237/232023-06-03 → 2023-06-10
    Underwater operations 1100Z to 2000Z daily 03 thru 10 jun by M/V rei alberto in 24-08.42S 046-16.05W
    Western South Atlantic · Brazil
  5. HYDROLANT 1227/232023-06-01 → 2023-06-08
    Survey operations in progress until 07 jun by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  6. HYDROLANT 1209/232023-05-31 → 2023-06-07
    Underwater operations 1100Z to 2000Z daily 31 may thru 07 jun by M/V rei alberto in 24-08.04S 046-10.23W
    Western South Atlantic · Brazil
  7. HYDROLANT 1153/232023-05-25 → 2024-01-26
    Survey operations in progress until 260300Z jan 24 by M/V c-warrior and M/V c-viking in area within ten…
    Western South Atlantic · Brazil
  8. HYDROLANT 1093/232023-05-18 → 2023-05-19
    Survey operations in progress until 182300Z may in areas bound by: a. 02-56.00S 038-00.20W, 02-56.00S…
    Western South Atlantic · Brazil
  9. HYDROLANT 1075/232023-05-15 → 2023-05-25
    Survey operations 16 thru 24 may by M/V ramform tethys towing 14 8000 meter long cables in area bound by…
    Western South Atlantic · Brazil
  10. HYDROLANT 1045/232023-05-12 → 2023-05-26
    Underwater operations 1100Z to 2100Z daily 12 thru 26 may by M/V comando b in 20-43.50S 040-09.42W
    Western South Atlantic · Brazil
  11. HYDROLANT 1023/232023-05-09 → 2023-05-17
    Survey operations in progress until 16 may by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  12. HYDROLANT 1011/232023-05-09 → 2023-05-14
    Underwater operations 1100Z to 2000Z daily 09 thru 14 may in 24-10.30S 046-19.30W
    Western South Atlantic · Brazil
  13. HYDROLANT 999/232023-05-08 → 2023-05-22
    Underwater operations 1000Z to 2000Z daily 07 thru 22 may by M/V open seas I in 20-54.37S 040-15.43W
    Western South Atlantic · Brazil
  14. HYDROLANT 955/232023-05-03 → 2023-05-10
    Survey operations in progress until 09 may by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  15. HYDROLANT 916/232023-04-29 → 2023-05-02
    Survey operations in progress until 01 may by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  16. HYDROLANT 833/232023-04-17 → 2023-04-29
    Survey operations in progress until 291000Z apr by M/V nho g sampaio and M/V nhib ten castelo in area bound…
    Western South Atlantic · Brazil
  17. HYDROLANT 832/232023-04-17 → 2023-04-17
    Survey operations in progress until 291000Z apr by M/V nho g sampaio and M/V nhib ten castelo in area bound…
    Western South Atlantic · Brazil
  18. HYDROLANT 783/232023-04-12 → 2023-04-18
    Survey operations in progress until 17 apr by M/V ramform tethys towing four 8000 meter long cables in area…
    Western South Atlantic · Brazil
  19. HYDROLANT 729/232023-04-04 → 2023-04-13
    Survey operations in progress until 12 apr by M/V siem dorado in area bound by 25-31.00S 044-27.00W,…
    Western South Atlantic
  20. HYDROLANT 712/232023-04-03 → 2023-04-11
    Survey operations 04 thru 10 apr by M/V ramform tethys towing 14 8000 meter long cables in area bound by…
    Western South Atlantic · Brazil
  21. HYDROLANT 677/232023-03-28 → 2023-04-24
    Survey operations 30 mar until further notice by M/V ramform vanguard towing ten 8000 meter long cables in…
    Eastern South Atlantic · Angola
  22. HYDROLANT 666/232023-03-27 → 2023-04-05
    Survey operations 28 mar thru 04 apr by M/V siem dorado in area bound by 25-31.00S 044-27.00W, 25-23.00S…
    Western South Atlantic
  23. HYDROLANT 659/232023-03-26 → 2023-04-05
    Survey operations 27 mar thru 04 apr by M/V ramform tethys towing 14 8000 meter long cables in area bound by…
    Western South Atlantic · Brazil
  24. HYDROLANT 630/232023-03-22 → 2023-03-26
    Survey operations in progress until 25 mar by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  25. HYDROLANT 619/232023-03-21 → 2023-03-29
    Survey operations in progress until 28 mar by M/V siem dorado in area bound by 25-31.00S 044-27.00W,…
    Western South Atlantic
  26. HYDROLANT 559/232023-03-14 → 2023-03-22
    Survey operations 15 thru 23 mar by M/V ramform tethys towing 14 8000 meter long cables in area bound by…
    Western South Atlantic · Brazil
  27. HYDROLANT 557/232023-03-13 → 2023-03-21
    Survey operations in progress until 20 mar by M/V siem dorado in area bound by 25-23.00S 044-42.00W,…
    Western South Atlantic
  28. HYDROLANT 513/232023-03-07 → 2023-03-14
    Survey operations in progress until 13 mar by M/V siem dorado in area bound by 25-23.00S 044-42.00W,…
    Western South Atlantic
  29. HYDROLANT 505/232023-03-06 → 2023-03-10
    Underwater operations in progress until further notice in: a. 28-19.30S 015-48.20E by M/V gariep
    Eastern South Atlantic · Namibia
  30. HYDROLANT 474/232023-03-01 → 2023-03-21
    Underwater operations in progress until further notice by M/V the explorer in area bound by 28-42.90S…
    Eastern South Atlantic · South Africa
  31. HYDROLANT 459/232023-02-28 → 2023-03-07
    Survey operations 28 feb thru 06 mar by M/V siem dorado in area bound by 25-23.00S 044-42.00W, 25-31.00S…
    Western South Atlantic
  32. HYDROLANT 458/232023-02-27 → 2023-03-28
    Survey operations in progress until further notice by M/V ramform vanguard towing 14 4500 meter long cables…
    Eastern South Atlantic · Angola
  33. HYDROLANT 457/232023-02-27 → 2023-05-25
    Survey operations in progress until further notice by M/V ramform titan towing 12 11112 meter long cables,…
    Eastern South Atlantic · Namibia
  34. HYDROLANT 409/232023-02-22 → 2023-03-02
    Survey operations in progress until 01 mar by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  35. HYDROLANT 375/232023-02-17 → 2023-02-27
    Survey operations in progress until further notice by M/V ramform titan towing 12 11112 meter long cables,…
    Eastern South Atlantic
  36. HYDROLANT 367/232023-02-16 → 2023-02-27
    Survey operations in progress until further notice by M/V ramform titan towing 12 11112 meter long cables in…
    Eastern South Atlantic
  37. HYDROLANT 354/232023-02-14 → 2023-03-06
    Underwater operations in progress until further notice in: a. 28-19.30S 015-48.20E by M/V gariep
    Eastern South Atlantic · Namibia
  38. HYDROLANT 353/232023-02-14 → 2023-02-14
    Underwater operations in progress until further notice by M/V coral sea in 28-30.70S 015-52.10E
    Eastern South Atlantic · Namibia
  39. HYDROLANT 347/232023-02-13 → 2023-05-18
    Survey operations in progress until further notice by M/V sw empress in area bound by 27-45.47S 013-55.57E,…
    Eastern South Atlantic · Namibia
  40. HYDROLANT 346/232023-02-13 → 2023-02-22
    Survey operations in progress until 21 feb by M/V ramform tethys towing 14 8000 meter long cables in area…
    Western South Atlantic · Brazil
  41. HYDROLANT 339/232023-02-11 → 2023-05-01
    Underwater operations in progress until 30 apr by M/V anita garibaldi, M/V bram titan and M/V normand…
    Western South Atlantic · Brazil
  42. HYDROLANT 317/232023-02-07 → 2023-02-10
    Underwater operations in progress until 282000Z feb by M/V sao pedro glorioso in: a. 21-49.08S 040-56.60W
    Western South Atlantic · Brazil
  43. HYDROLANT 316/232023-02-07 → 2023-02-10
    Underwater operations in progress until 282000Z feb by M/V sao pedro glorioso in: a. 21-50.13S 040-47.78W
    Western South Atlantic · Brazil
  44. HYDROLANT 315/232023-02-07 → 2023-02-07
    Underwater operations in progress until 282000Z feb by M/V sao pedro glorioso in: a. 21-50.13S 040-47.78W
    Western South Atlantic · Brazil
  45. HYDROLANT 282/232023-02-04 → 2023-02-21
    Survey operations in progress until 210001Z feb by M/V drs ipanema in area bound by 19-27.00S 039-41.00W,…
    Western South Atlantic · Brazil
  46. HYDROLANT 278/232023-02-04 → 2023-02-04
    Underwater operations 041100Z to 042100Z feb by M/V silencio IV in area bound by 21-13.68S 040-41.67W,…
    Western South Atlantic · Brazil
  47. HYDROLANT 277/232023-02-03 → 2023-02-04
    Survey operations in progress until 01 aug by M/V drs ipanema in area bound by 19-27.00S 039-41.00W,…
    Western South Atlantic · Brazil
  48. HYDROLANT 130/232023-01-16 → 2023-01-24
    Survey operations by M/V sw diamond towing nine 225 meter long cables: a. 170300Z to 200259Z jan in area…
    Western South Atlantic
  49. HYDROLANT 101/232023-01-12 → 2023-01-17
    Survey operations in progress until 16 jan by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  50. HYDROLANT 83/232023-01-10 → 2023-01-17
    Survey operations by M/V sw diamond towing nine 225 meter long cables: a. 100300Z to 130259Z jan in area…
    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 4 · seahazards