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 1687/162016-07-04 → 2016-08-01
    Survey operations in progress until 31 jul by M/V dp star towing 1000 meter long cable in area bound by…
    Eastern South Atlantic · Namibia
  2. HYDROLANT 1673/162016-07-03 → 2016-07-10
    Underwater operations 1100Z to 2100Z daily 04 thru 10 jul by M/V zilah and M/V semiramis in 20-19.29S…
    Brazil-southeast Coast
  3. HYDROLANT 1668/162016-07-02 → 2016-07-10
    Survey operations in progress until 09 jul by M/V ocean endeavour in area bound by 23-30S 043-00W, 24-42S…
    Brazil-southeast Coast
  4. HYDROLANT 1665/162016-07-02 → 2016-07-06
    Underwater operations 1100Z to 2100Z daily 02 thru 06 jul by M/V proboat and M/V nm asian blosson in…
    Brazil-southeast Coast
  5. HYDROLANT 1622/162016-06-28 → 2016-07-06
    Underwater operations 0900Z to 2100Z daily 29 jun thru 06 jul by M/V nm golden feng, M/V probat and M/V sion…
    Brazil-southeast Coast
  6. HYDROLANT 1616/162016-06-27 → 2016-07-06
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-43.2S 015-56.2E
    Eastern South Atlantic · Namibia
  7. HYDROLANT 1595/162016-06-24 → 2016-06-27
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-33.5S 015-57.3E
    Eastern South Atlantic · Namibia
  8. HYDROLANT 1406/162016-06-08 → 2017-04-05
    Scientific mooring established in 44-25.38S 059-55.13W
    Western South Atlantic
  9. HYDROLANT 1368/162016-06-05 → 2016-10-22
    Scientific moorings established: a. M3, in 44-41.06S 058-33.92W
    Western South Atlantic · Argentina
  10. HYDROLANT 1331/162016-06-01 → 2016-10-02
    Underwater operations 0800Z to 2000Z daily until 02 oct by M/V ankh with submersible in area bound by…
    Brazil-northeast Coast
  11. HYDROLANT 1323/162016-06-01 → 2016-12-02
    Cancel this msg 020400Z dec 16
    Brazil-north Coast
  12. HYDROLANT 1279/162016-05-28 → 2016-06-24
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-27.9S 015-51.5E
    Eastern South Atlantic · Namibia
  13. HYDROLANT 1226/162016-05-24 → 2016-06-05
    Scientific moorings established: a. M3, in 44-41.06S 058-33.92W
    Western South Atlantic · Argentina
  14. HYDROLANT 1170/162016-05-18 → 2016-05-28
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-43.7S 015-54.9E
    Eastern South Atlantic · Namibia
  15. HYDROLANT 1139/162016-05-13 → 2016-05-18
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-29.5S 015-54.7E
    Eastern South Atlantic · Namibia
  16. HYDROLANT 940/162016-04-20 → 2016-04-21
    Oceanographic operations in progress until further notice by M/V puerto deseado in 54-50.5S 061-32.1W
    Western South Atlantic · Scotia Sea · Argentina
  17. HYDROLANT 907/162016-04-15 → 2016-06-05
    Underwater operations in progress until further notice by M/V maersk venturer vicinity 36-13.35S 051-33.57W
    Western South Atlantic
  18. HYDROLANT 904/162016-04-15 → 2016-05-13
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-43.7S 015-54.9E
    Eastern South Atlantic · Namibia
  19. HYDROLANT 892/162016-04-13 → 2016-05-13
    Underwater operations in progress until 12 may by M/V sarmiento de gamboa in area bound by 38-11S 053-09W,…
    Western South Atlantic · Uruguay
  20. HYDROLANT 882/162016-04-13 → 2016-04-13
    Underwater operations in progress until 12 may by M/V sarmiento de gamboa in area bound by 35-31.8S…
    Western South Atlantic · Uruguay
  21. HYDROLANT 877/162016-04-12 → 2016-04-13
    Underwater operations in progress until 12 may by M/V sarmiento de gamboa in area bound by 35-53S 056-06W,…
    Western South Atlantic · Uruguay
  22. HYDROLANT 867/162016-04-11 → 2016-04-25
    Underwater operations 1100Z to 2100Z daily 11 thru 25 apr by M/V dako tide and M/V bravamar XV in 20-20.83S…
    Brazil-southeast Coast
  23. HYDROLANT 851/162016-04-10 → 2016-04-12
    Oceanographic operations in progress until further notice by M/V puerto deseado in 54-33.5S 062-49.7W
    Western South Atlantic · Scotia Sea · Argentina
  24. HYDROLANT 849/162016-04-10 → 2016-04-10
    Oceanographic operations in progress until further notice by M/V puerto deseado in 54-38.3S 062-49.0W
    Western South Atlantic · Scotia Sea · Argentina
  25. HYDROLANT 823/162016-04-07 → 2016-06-01
    Underwater operations 0800Z to 2000Z daily until 02 jun in area bound by 04-54.31S 036-25.26W, 04-54.34S…
    Brazil-northeast Coast
  26. HYDROLANT 801/162016-04-04 → 2016-04-07
    Underwater operations 1100Z to 2100Z daily 05 thru 07 apr by M/V proboat, M/V sion and M/V nm eastern…
    Brazil-southeast Coast
  27. HYDROLANT 794/162016-04-03 → 2016-04-15
    Underwater operations 1100Z to 2100Z daily 04 thru 15 apr by M/V cmb pomerol and M/V bravamar I in 20-22.92S…
    Brazil-southeast Coast
  28. HYDROLANT 765/162016-03-30 → 2016-03-31
    Oceanographic operations in progress by M/V puerto deseado in 54-30.8S 058-50.7W
    Western South Atlantic · Scotia Sea
  29. HYDROLANT 761/162016-03-30 → 2016-03-30
    Oceanographic operations in progress by M/V puerto deseado in 54-52.9S 058-25.8W
    Western South Atlantic · Scotia Sea
  30. HYDROLANT 751/162016-03-29 → 2016-03-30
    Oceanographic operations in progress by M/V puerto deseado in 54-25.3S 058-22.7W
    Western South Atlantic · Scotia Sea
  31. HYDROLANT 749/162016-03-29 → 2016-04-15
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-43.7S 015-54.9E
    Eastern South Atlantic · Namibia
  32. HYDROLANT 714/162016-03-24 → 2016-03-29
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-30.0S 015-51.3E
    Eastern South Atlantic · Namibia
  33. HYDROLANT 674/162016-03-19 → 2016-03-26
    Underwater operations in progress until 262100Z mar by M/V lancha bravamar I and M/V nord glory in 20-22.83S…
    Brazil-southeast Coast
  34. HYDROLANT 653/162016-03-17 → 2016-04-15
    Underwater operations in progress until further notice by M/V maersk venturer vicinity 36-13.58S 051-33.95W
    Western South Atlantic
  35. HYDROLANT 576/162016-03-10 → 2016-03-19
    Underwater operations 1100Z to 2100Z daily 11 thru 19 mar by M/V sion, M/V proboat and M/V nm alcyon in…
    Brazil-southeast Coast
  36. HYDROLANT 571/162016-03-09 → 2016-03-21
    Underwater operations 1100Z to 2100Z daily 11 thru 21 mar by M/V lancha zilah and M/V iolcos vision in…
    Brazil-southeast Coast
  37. HYDROLANT 551/162016-03-07 → 2016-03-24
    Underwater operations in progress until further notice by: a. M/V gariep in 28-30.5S 015-51.7E
    Eastern South Atlantic · Namibia
  38. HYDROLANT 488/162016-02-28 → 2016-03-10
    Underwater operations 1100Z to 2100Z daily 29 feb thru 10 mar by M/V atout and M/V lancha zilah II in…
    Brazil-southeast Coast
  39. HYDROLANT 429/162016-02-20 → 2016-02-27
    Underwater operations 1000Z to 2000Z daily 20 thru 27 feb by M/V lancha sion, M/V proboat and M/V nm…
    Brazil-southeast Coast
  40. HYDROLANT 386/162016-02-15 → 2016-03-07
    Underwater operations in progress until further notice by: a. M/V gariep in 28-30.5S 015-51.7E
    Eastern South Atlantic · Namibia
  41. HYDROLANT 169/162016-01-19 → 2016-01-24
    Underwater operations in progress until 23 jan by M/V tango towing 250 meter long cable vicinity of…
    Western South Atlantic · Argentina
  42. HYDROLANT 50/162016-01-05 → 2016-01-18
    Underwater operations 07 thru 17 jan by M/V karem tide in 20-19.25S 040-18.33W
    Brazil-southeast Coast
  43. HYDROLANT 31/162016-01-03 → 2016-02-15
    Underwater operations in progress until further notice by: a. M/V gariep in 28-30.5S 015-51.7E
    Eastern South Atlantic · Namibia
  44. HYDROLANT 12/162016-01-01 → 2016-06-05
    Scientific moorings established: a. M1, in 44-42.59S 059-35.04W
    Western South Atlantic
  45. HYDROLANT 3106/152015-12-15 → 2016-01-03
    Underwater operations in progress until further notice by: a. M/V gariep in 28-30.5S 015-51.7E
    Eastern South Atlantic · Namibia
  46. HYDROLANT 2972/152015-12-01 → 2016-01-01
    Scientific moorings established: a. M1, in 44-42.59S 059-35.04W
    Western South Atlantic
  47. HYDROLANT 2926/152015-11-27 → 2016-05-31
    Underwater operations 0900Z to 0300Z commencing daily 26 nov thru 30 may 16 in area bound by 02-57.64S…
    Brazil-north Coast
  48. HYDROLANT 2894/152015-11-24 → 2015-12-15
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.2S 016-08.6E
    Eastern South Atlantic · Namibia
  49. HYDROLANT 2879/152015-11-23 → 2015-11-24
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.2S 016-08.6E
    Eastern South Atlantic · Namibia
  50. HYDROLANT 2784/152015-11-13 → 2015-11-23
    Underwater operations in progress until further notice by: a. M/V gariep in 28-30.0S 015-49.0E
    Eastern South Atlantic · Namibia

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 33 · seahazards