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 · 268 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 · 177 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 · 67 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 730/172017-03-05 → 2017-03-11
    Underwater operations in progress until 10 mar by M/V solitaire in 23-56.0S 042-34.2W
    Western South Atlantic · Brazil-south Coast
  2. HYDROLANT 715/172017-03-04 → 2017-03-06
    Survey operations in progress until by M/V polarcus alima towing 12 8100 meter long cables along tracklines…
    Western South Atlantic
  3. HYDROLANT 712/172017-03-03 → 2017-03-12
    Survey operations 04 thru 11 mar by M/V oceanic champion towing 12 7408 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 711/172017-03-03 → 2017-03-12
    Survey operations 04 thru 11 mar by M/V polarcus adira towing 9000 meter long cable in area bound by 25-21S…
    Western South Atlantic · Brazil-south Coast
  5. HYDROLANT 697/172017-03-03 → 2017-03-05
    Survey operations in progress until 04 mar by M/V polarcus alima towing 12 8100 meter long cables along…
    Western South Atlantic
  6. HYDROLANT 692/172017-03-02 → 2017-03-12
    Survey operations 04 thru 11 mar by M/V bgp challenger towing 12000 meter long cable in area bound by…
    Western South Atlantic · Brazil-northeast Coast
  7. HYDROLANT 675/172017-03-01 → 2017-03-03
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 01 mar…
    Western South Atlantic
  8. HYDROLANT 660/172017-02-28 → 2017-03-01
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 28 feb…
    Western South Atlantic
  9. HYDROLANT 646/172017-02-26 → 2017-03-25
    Underwater operations 1100Z to 2100Z daily 26 feb thru 25 mar in 20-15.37S 040-01.22W
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 643/172017-02-26 → 2017-03-01
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 26 feb…
    Western South Atlantic
  11. HYDROLANT 611/172017-02-23 → 2017-03-05
    Survey operations in progress until 04 mar by M/V oceanic champion towing 12 7408 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 606/172017-02-23 → 2017-02-25
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 23 feb…
    Western South Atlantic
  13. HYDROLANT 605/172017-02-23 → 2017-03-05
    Survey operations in progress until 04 mar by M/V bgp challenger towing 12000 meter long cable in area bound…
    Western South Atlantic · Brazil-northeast Coast
  14. HYDROLANT 603/172017-02-22 → 2017-03-05
    Survey operations in progress until 04 mar by M/V polarcus adira towing 9000 meter long cable in area bound…
    Western South Atlantic · Brazil-south Coast
  15. HYDROLANT 574/172017-02-19 → 2017-02-22
    Survey operations in progress until 21 feb by M/V polarcus alima towing 12 8100 meter long cables along…
    Western South Atlantic
  16. HYDROLANT 562/172017-02-18 → 2017-02-19
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 18 feb…
    Western South Atlantic
  17. HYDROLANT 549/172017-02-17 → 2017-02-20
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 17 feb along trackline between…
    Western South Atlantic
  18. HYDROLANT 542/172017-02-17 → 2017-02-19
    Survey operations in progress until 18 feb by M/V polarcus alima towing 12 8100 meter long cables along…
    Western South Atlantic
  19. HYDROLANT 533/172017-02-16 → 2017-03-10
    Underwater operations 1000Z to 2000Z daily 16 feb thru 10 mar by M/V cape matilde in 20-22.78S 040-08.63W
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 527/172017-02-15 → 2017-02-23
    Survey operations in progress until 23 feb by M/V bgp challenger towing 10000 meter long cable in area bound…
    Western South Atlantic · Brazil-northeast Coast
  21. HYDROLANT 512/172017-02-14 → 2017-02-22
    Survey operations 15 thru 21 feb by M/V polarcus adira towing 9000 meter long cable in area bound by 25-22S…
    Western South Atlantic · Brazil-south Coast
  22. HYDROLANT 511/172017-02-14 → 2017-02-22
    Survey operations in progress until 21 feb by M/V oceanic champion towing 12 7400 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  23. HYDROLANT 508/172017-02-14 → 2017-02-17
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 14 feb…
    Western South Atlantic
  24. HYDROLANT 498/172017-02-13 → 2017-02-18
    Survey operations in progress until 17 feb by M/V piaui XV towing 10000 meter long cable in area bound by…
    Western South Atlantic · Brazil-northeast Coast
  25. HYDROLANT 495/172017-02-13 → 2017-02-14
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 13 feb…
    Western South Atlantic
  26. HYDROLANT 465/172017-02-10 → 2017-02-13
    Survey operations in progress until further notice by M/V polarcus alima towing 12 8100 meter long cables…
    Western South Atlantic
  27. HYDROLANT 430/172017-02-07 → 2017-02-08
    Underwater operations 081230Z to 081530Z feb by M/V omega, M/V leonis, M/V LAEP-10 and M/V dourado in area…
    Western South Atlantic · Brazil-northeast Coast
  28. HYDROLANT 412/172017-02-06 → 2017-02-08
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 06 feb…
    Western South Atlantic · Uruguay
  29. HYDROLANT 410/172017-02-06 → 2017-03-27
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-33.2S 015-48.7E
    Eastern South Atlantic · Namibia
  30. HYDROLANT 383/172017-02-03 → 2017-02-12
    Survey operations 04 thru 11 feb by M/V polarcus adira towing 9200 meter long cable in area bound by 25-22S…
    Western South Atlantic · Brazil-south Coast
  31. HYDROLANT 382/172017-02-03 → 2017-02-12
    Survey operations 04 thru 11 feb by M/V oceanic champion towing 12 8000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 381/172017-02-03 → 2017-02-12
    Survey operations 04 thru 11 feb by M/V bgp challenger towing 1200 meter long cable in area bound by 04-31S…
    Western South Atlantic · Brazil-northeast Coast
  33. HYDROLANT 379/172017-02-03 → 2017-02-06
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 03 feb…
    Western South Atlantic · Uruguay
  34. HYDROLANT 336/172017-02-01 → 2017-02-03
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 01 feb…
    Western South Atlantic
  35. HYDROLANT 310/172017-01-30 → 2017-02-01
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 30 jan…
    Western South Atlantic
  36. HYDROLANT 304/172017-01-29 → 2017-01-30
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 29 jan…
    Western South Atlantic
  37. HYDROLANT 301/172017-01-28 → 2017-01-30
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 28 jan…
    Western South Atlantic
  38. HYDROLANT 296/172017-01-27 → 2017-02-05
    Survey operations 28 jan thru 04 feb by M/V polarcus adira towing 9000 meter long cable in area bound by…
    Western South Atlantic · Brazil-south Coast
  39. HYDROLANT 295/172017-01-27 → 2017-02-05
    Survey operations 28 jan thru 04 feb by M/V oceanic champion towing 12 8000 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 269/172017-01-26 → 2017-02-04
    Survey operations in progress until 03 feb by M/V bgp challenger towing 12000 meter long cable in area bound…
    Western South Atlantic · Brazil-northeast Coast
  41. HYDROLANT 267/172017-01-25 → 2017-01-28
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 25 jan…
    Western South Atlantic
  42. HYDROLANT 249/172017-01-24 → 2017-02-06
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-43.2S 015-58.7E
    Eastern South Atlantic · Namibia
  43. HYDROLANT 222/172017-01-21 → 2017-01-29
    Survey operations in progress until 28 jan by M/V dp star towing 100 meter long cable in area bound by…
    Eastern South Atlantic · South Africa
  44. HYDROLANT 154/172017-01-16 → 2017-01-24
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-43.2S 015-58.7E
    Eastern South Atlantic · Namibia
  45. HYDROLANT 150/172017-01-15 → 2017-01-30
    Underwater operations 1000Z to 2000Z daily 16 thru 30 jan by M/V ultra esterhazy, M/V proboat and M/V seamar…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 109/172017-01-10 → 2017-01-28
    Underwater operations 12 thru 27 jan by MV harmonious, comando-b and alta navegacao in 20-22.15S 040-13.13W
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 93/172017-01-09 → 2017-01-25
    Underwater operations 1000Z to 2000Z daily 10 thru 25 jan by M/V bulk bolivia, M/V comando-b and M/V alta…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 50/172017-01-05 → 2017-01-20
    Underwater operations 1030Z to 2000Z daily 06 thru 20 jan by M/V saga fortune e comando-b in 20-20.08S…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 18/172017-01-01 → 2017-04-01
    Scientific moorings established until 312359Z mar in: a. a, 44-42.59S 059-35.04W
    Western South Atlantic · Argentina
  50. HYDROLANT 2/172017-01-01 → 2017-01-01
    Scientific moorings established in: a. a, 44-42.59S 059-35.04W
    Western South Atlantic · Argentina

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 31 · seahazards