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 2856/222022-11-09 → 2022-11-21
    Survey operations in progress until 21 nov by M/V pgs apollo towing six 400 meter long cables in area bound…
    Western South Atlantic · Brazil
  2. HYDROLANT 2854/222022-11-09 → 2022-11-15
    Underwater operations 091100Z to 152000Z nov by M/V nm cassiopeia ocean and M/V r neto I in 24-11.00S…
    Western South Atlantic · Brazil
  3. HYDROLANT 2845/222022-11-07 → 2022-12-28
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 4050 meter long cables…
    Eastern South Atlantic · Angola
  4. HYDROLANT 2835/222022-11-07 → 2022-11-15
    Survey operations 08 thru 14 nov by M/V subsea viking towing cables along trackline joining 24-58.46S…
    Western South Atlantic
  5. HYDROLANT 2831/222022-11-06 → 2022-11-14
    Survey operations 07 thru 13 nov by M/V oceanic vega towing ten 12964 meter long cables in area bound by…
    Western South Atlantic
  6. HYDROLANT 2830/222022-11-06 → 2022-11-14
    Underwater operations 071100Z to 142000Z nov by M/V r neto I, M/V balzani and M/V ecopacific in 24-11.00S…
    Western South Atlantic · Brazil
  7. HYDROLANT 2826/222022-11-05 → 2022-11-13
    Underwater operations 061100Z to 132000Z nov by M/V rei alberto, M/V ocean rhea and M/V beijing 2008 in…
    Western South Atlantic · Brazil
  8. HYDROLANT 2814/222022-11-04 → 2022-11-11
    Underwater operations 1100Z to 2000Z daily 04 thru 11 nov by M/V stalo in 24-11.00S 046-21.00W
    Western South Atlantic · Brazil
  9. HYDROLANT 2813/222022-11-04 → 2022-11-11
    Underwater operations 1100Z to 2000Z daily 04 thru 11 nov by M/V ventury joy in 24-11.00S 046-21.00W
    Western South Atlantic · Brazil
  10. HYDROLANT 2811/222022-11-04 → 2022-11-20
    Underwater operations 1100Z to 2100Z daily 06 thru 20 nov by M/V comando b, M/V zatto, M/V qing feng ling,…
    Western South Atlantic · Brazil
  11. HYDROLANT 2810/222022-11-04 → 2022-11-17
    Underwater operations 1100Z to 2100Z daily 04 thru 17 nov by M/V cynoma pride and M/V deep star in: a.…
    Western South Atlantic · Brazil
  12. HYDROLANT 2804/222022-11-03 → 2022-11-17
    Underwater operations 1100Z to 2100Z daily 03 thru 17 nov by M/V imperial fortune in 20-18.47S 040-09.18W
    Western South Atlantic · Brazil
  13. HYDROLANT 2796/222022-11-03 → 2023-03-01
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-49.80S…
    Eastern South Atlantic · Namibia
  14. HYDROLANT 2773/222022-11-01 → 2022-12-14
    Survey operations 03 nov until further notice by M/V sw empress in area bound by 28-44.00S 015-05.00E,…
    Eastern South Atlantic · Namibia · South Africa
  15. HYDROLANT 2768/222022-11-01 → 2022-11-09
    Survey operations in progress until 08 nov by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  16. HYDROLANT 2760/222022-10-30 → 2022-11-08
    Survey operations 31 oct thru 07 nov by M/V oceanic vega towing ten 12964 meter long cables in area bound by…
    Western South Atlantic
  17. HYDROLANT 2756/222022-10-30 → 2022-11-08
    Survey operations 31 oct thru 07 nov by M/V pgs apollo towing 14 400 meter long cables in area bound by…
    Western South Atlantic · Brazil
  18. HYDROLANT 2755/222022-10-30 → 2022-10-30
    Survey operations 31 oct thru 07 nov by M/V pgs apollo towing 14 400 meter long cables in area bound by…
    Western South Atlantic · Brazil
  19. HYDROLANT 2727/222022-10-26 → 2022-11-09
    Survey operations in progress until 08 nov by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  20. HYDROLANT 2719/222022-10-26 → 2022-11-03
    Survey operations in progress until 02 nov by M/V artemis odyssey towing six cables in area bound by…
    Western South Atlantic
  21. HYDROLANT 2716/222022-10-25 → 2022-10-26
    Underwater operations in progress until 262000Z oct by M/V saligna e obrigado senhor III in 20-50.33S…
    Western South Atlantic · Brazil
  22. HYDROLANT 2701/222022-10-24 → 2022-10-31
    Survey operations in progress until 30 oct by M/V oceanic vega towing ten 12964 meter long cables in area…
    Western South Atlantic
  23. HYDROLANT 2700/222022-10-24 → 2022-11-01
    Survey operations in progress until 31 oct by M/V pgs apollo towing six 14 meter long cables in area bound…
    Western South Atlantic · Brazil
  24. HYDROLANT 2697/222022-10-23 → 2022-11-04
    Underwater operations in progress until further notice by: a. M/V gariep in 28-19.30S 015-48.20E
    Eastern South Atlantic · Namibia
  25. HYDROLANT 2664/222022-10-20 → 2022-11-04
    Underwater operations 1000Z to 2000Z daily 20 oct thru 04 nov by M/V maersk kalea and M/V open seas I in…
    Western South Atlantic · Brazil
  26. HYDROLANT 2663/222022-10-20 → 2022-10-27
    Underwater operations 1100Z to 2000Z daily 20 thru 27 oct in 24-11.00S 046-21.00W
    Western South Atlantic · Brazil
  27. HYDROLANT 2651/222022-10-19 → 2022-11-02
    Survey operations in progress until 01 nov by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  28. HYDROLANT 2646/222022-10-18 → 2022-10-26
    Survey operations in progress until 25 oct by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  29. HYDROLANT 2642/222022-10-17 → 2022-11-03
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-31.40S…
    Eastern South Atlantic · Namibia
  30. HYDROLANT 2633/222022-10-15 → 2022-10-24
    Survey operations 17 thru 24 oct by M/V pgs apollo towing six 400 meter long cables in area bound by…
    Western South Atlantic · Brazil
  31. HYDROLANT 2631/222022-10-15 → 2022-10-24
    Survey operations 17 thru 24 oct by M/V oceanic vega towing ten 12964 meter long cables in area bound by…
    Western South Atlantic
  32. HYDROLANT 2624/222022-10-15 → 2022-10-20
    Underwater operations 1100Z to 2000Z daily 15 thru 23 oct in 24-11.00S 046-21.00W
    Western South Atlantic · Brazil
  33. HYDROLANT 2623/222022-10-15 → 2022-10-15
    Underwater operations 1100Z to 2000Z daily 15 thru 22 oct in 24-11.00S 046-21.00W
    Western South Atlantic · Brazil
  34. HYDROLANT 2614/222022-10-14 → 2022-10-17
    Underwater operations in progress until further notice by M/V the explorer in area bound by 28-30.20S…
    Eastern South Atlantic · Namibia
  35. HYDROLANT 2600/222022-10-12 → 2022-10-23
    Underwater operations in progress thru 22 oct in 22-28.02S 040-01.80W
    Western South Atlantic · Brazil
  36. HYDROLANT 2589/222022-10-12 → 2022-10-18
    Survey operations in progress until 17 oct by S/V diamond towing 9 225 meter cables
    Western South Atlantic
  37. HYDROLANT 2587/222022-10-11 → 2022-10-13
    Underwater operations in progress until 05 jan 23 by by draga lelystad, draga njord and drs belatrix in area…
    Western South Atlantic · Brazil
  38. HYDROLANT 2586/222022-10-11 → 2022-10-26
    Survey operations in progress until 25 oct by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  39. HYDROLANT 2581/222022-10-11 → 2022-10-14
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-37.50S 015-49.90E
    Eastern South Atlantic · Namibia · South Africa
  40. HYDROLANT 2571/222022-10-10 → 2022-10-11
    Survey operations in progress until 102359Z oct by M/V sw diamond towing nine 225 meter long cables in area…
    Western South Atlantic
  41. HYDROLANT 2568/222022-10-10 → 2022-10-18
    Survey operations 11 thru 17 oct by M/V pgs apollo irin towing six 400 meter long cables in area bound by…
    Western South Atlantic · Brazil
  42. HYDROLANT 2567/222022-10-10 → 2022-10-17
    Survey operations in progress until 16 oct by M/V oceanic vega towing 12 12964 meter cables in area bound by…
    Western South Atlantic
  43. HYDROLANT 2561/222022-10-09 → 2022-10-18
    Survey operations in progress until 181500Z oct by M/V napoc iguatemi in area bound by 01-47.13S 043-48.30W,…
    Western South Atlantic · Brazil
  44. HYDROLANT 2560/222022-10-09 → 2022-10-11
    Survey operations in progress until 10 oct by M/V oceanic vega towing 12 12964 meter cables in area bound by…
    Western South Atlantic
  45. HYDROLANT 2537/222022-10-06 → 2022-10-09
    Survey operations in progress until 08 oct by M/V oceanic vega towing 12 12964 meter cables
    Western South Atlantic
  46. HYDROLANT 2522/222022-10-05 → 2022-10-11
    Survey operations in progress until 18 oct by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  47. HYDROLANT 2510/222022-10-04 → 2022-10-07
    Survey operations in progress until 06 oct by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  48. HYDROLANT 2504/222022-10-03 → 2022-10-06
    Survey operations in progress until 05 oct by M/V oceanic vega towing 12 12964 meter long cables in area…
    Western South Atlantic
  49. HYDROLANT 2503/222022-10-03 → 2022-10-04
    Survey operations in progress until 04 oct by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  50. HYDROLANT 2499/222022-10-02 → 2022-10-11
    Survey operations 03 thru 10 oct by M/V pgs apollo towing six 414 meter long cables in area bound by…
    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 6 · seahazards