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 1436/202020-04-27 → 2020-04-28
    Survey operations in progress until 05 may by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 1418/202020-04-24 → 2020-05-17
    Underwater operations in progress 0900Z to 2100Z daily until 17 may by M/V sistac vida in 22-24.5S 041-40.0W
    Western South Atlantic · Brazil-south Coast
  3. HYDROLANT 1416/202020-04-24 → 2020-04-28
    Survey operations 25 apr thru 02 may by M/V geo caribbean towing ten 12000 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 1342/202020-04-15 → 2020-04-27
    Survey operations in progress until 280400Z apr by M/V ramform titan towing 14 10000 meter long cables in…
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 1336/202020-04-15 → 2020-04-24
    Survey operations 15 thru 25 apr by M/V geo caribbean towing ten 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 1261/202020-04-08 → 2020-04-15
    Survey operations 07 thru 16 apr by M/V ramform titan towing 14 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 1252/202020-04-07 → 2020-04-08
    Underwater operations 1000Z to 2000Z daily 07 apr thru 25 may in 20-19.27S 040-12.42W
    Western South Atlantic · Brazil-southeast Coast
  8. HYDROLANT 1251/202020-04-07 → 2020-04-07
    Underwater operations 1000Z to 2000Z daily 07 apr thru 25 may by M/V dl dahlia and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  9. HYDROLANT 1250/202020-04-07 → 2020-04-07
    Underwater operations in progress thru 25 may by M/V loch long and M/V open seas I in 20-19.27S 040-12.42W
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 1249/202020-04-07 → 2020-04-07
    Underwater operations 1IN progress thru 25 may by M/V santa rosalia and M/V open seas I in 20-19.27S…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 1245/202020-04-07 → 2020-04-07
    Underwater operations 1000Z to 2000Z daily 07 apr thru 25 may by M/V am contrecoeur and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 1231/202020-04-05 → 2020-04-12
    Survey operations in progress until 11 apr by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 1184/202020-04-02 → 2020-05-15
    Survey operations in progress until 15 may by M/V ivan gubkin towing ten 11000 meter long cables in area…
    Western South Atlantic
  14. HYDROLANT 1160/202020-03-31 → 2020-04-07
    Survey operations in progress until 06 apr by M/V hai yang shi you 720 and M/V hai yang shi you 771 towing…
    Western South Atlantic
  15. HYDROLANT 1134/202020-03-27 → 2020-03-30
    Survey operations in progress until 29 mar by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 1119/202020-03-26 → 2020-04-30
    Underwater operations 1100Z to 2000Z daily 27 mar thru 30 apr by M/V cape bari in 20-23.13S 040-07.82W
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 1118/202020-03-26 → 2020-03-27
    Underwater operations 1100Z to 2000Z daily 27 mar thru 30 apr by M/V n bonanza in 20-23.60S 040-07.42W
    Western South Atlantic · Brazil-southeast Coast
  18. HYDROLANT 1091/202020-03-24 → 2020-04-01
    Survey operations 25 thru 31 mar by M/V ramform titan towing 14 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  19. HYDROLANT 1079/202020-03-23 → 2020-04-30
    Underwater operations 0800Z to 1700Z daily 25 mar thru 30 apr by M/V emerald enterprise in 20-23.98S…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 1006/202020-03-17 → 2020-03-24
    Survey operations in progress until 25 mar by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 1005/202020-03-17 → 2020-03-24
    Survey operations in progress until 23 mar by M/V hai yang shi you 720, M/V agil I and M/V yang shi you 771…
    Western South Atlantic
  22. HYDROLANT 1004/202020-03-17 → 2020-03-20
    Underwater operations 1100Z to 2000Z daily 17 mar thru 30 apr by M/V star majesty, M/V zatto e and M/V…
    Western South Atlantic · Brazil-southeast Coast
  23. HYDROLANT 1003/202020-03-17 → 2020-03-25
    Survey operations in progress until 24 mar by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 990/202020-03-16 → 2020-04-10
    Survey operations in progress until 15 apr by M/V ocean dream and M/V bgp pioneer eco warrior each towing…
    Western South Atlantic · Brazil-northeast Coast
  25. HYDROLANT 982/202020-03-15 → 2020-03-22
    Survey operations in progress until 16 may 20 by M/V polarcus naila towing ten 8100 meter long cables in…
    Eastern South Atlantic · Gulf of Guinea · Sao Tome and Principe
  26. HYDROLANT 975/202020-03-14 → 2020-03-22
    Survey operations in progress until 21 mar by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 964/202020-03-14 → 2020-03-20
    Underwater operations 1100Z to 2000Z daily 14 mar thru 30 apr by M/V wl ladoga in 20-23.77S 040-07.65W
    Western South Atlantic · Brazil-southeast Coast
  28. HYDROLANT 920/202020-03-10 → 2020-03-17
    Survey operations in progress until 17 mar by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 898/202020-03-09 → 2020-03-17
    Survey operations 10 mar thru 17 mar by M/V hai yang shi you 720 and M/V hai yang shi you 771 each towing…
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 862/202020-03-05 → 2020-03-14
    Survey operations in progress until 14 mar by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 814/202020-03-03 → 2020-03-14
    Survey operations 03 thru 13 mar by M/V bgp pioneer towing 12500 meter long cable in area bound by 04-34.47S…
    Western South Atlantic · Brazil-northeast Coast
  32. HYDROLANT 781/202020-03-01 → 2020-03-03
    Survey operations 02 thru 13 mar by M/V bgp pioneer towing 12500 meter long cable in area bound by 05-26.43S…
    Western South Atlantic · Brazil-northeast Coast
  33. HYDROLANT 780/202020-03-01 → 2020-03-08
    Survey operations 02 thru 07 mar by M/V ramform titan towing 14 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 779/202020-03-01 → 2020-03-10
    Survey operations 02 thru 10 mar by M/V ivan gubkin towing ten 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 765/202020-02-29 → 2020-03-01
    Survey operations in progress until 10 apr by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 753/202020-02-29 → 2020-03-05
    Survey operations in progress until 07 mar by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 725/202020-02-27 → 2020-05-28
    Underwater operations in progress until further notice by M/V explorer in area bound by 28-54.3S 016-21.8E,…
    South Atlantic · South Africa
  38. HYDROLANT 717/202020-02-27 → 2020-03-25
    Survey operations 270500Z feb to 252100Z mar by M/V sable in area bound by 10-44.76S 036-33.13W, 10-44.53S…
    Western South Atlantic · Brazil-east Coast
  39. HYDROLANT 696/202020-02-25 → 2020-03-03
    Survey operations in progress until 02 mar by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 684/202020-02-24 → 2020-04-07
    Survey operations in progress until further notice by M/V ramform vanguard towing ten 8025 meter long cables…
    Eastern South Atlantic · Angola
  41. HYDROLANT 671/202020-02-23 → 2020-02-27
    Underwater operations in progress until further notice by M/V explorer in area bound by 28-54.3S 016-21.8E,…
    South Atlantic · South Africa
  42. HYDROLANT 663/202020-02-22 → 2020-02-29
    Survey operations in progress until 02 mar by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 662/202020-02-22 → 2020-03-01
    Survey operations in progress until 29 feb by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 590/202020-02-18 → 2020-03-16
    Underwater operations 181500Z feb until further notice by M/V thalassa in area bound by 12-00N 023-00W,…
    Eastern North Atlantic · South Atlantic
  45. HYDROLANT 589/202020-02-18 → 2020-03-19
    Underwater operations 1100Z to 2000Z daily 19 feb thru 19 mar by M/V nord nanami and M/V sea and mar III in…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 586/202020-02-18 → 2020-02-25
    Survey operations in progress until 25 feb by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 585/202020-02-17 → 2020-02-18
    Underwater operations 1100Z to 2000Z daily 18 feb thru 28 mar by M/V nord nanami and M/V opens seas I in…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 544/202020-02-15 → 2020-02-23
    Survey operations 15 thru 22 feb by M/V geo caribbean towing 12 11200 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROPAC 548/202020-02-14 → 2020-03-02
    Survey operations in progress until 01 mar by M/V marion dufresne along trackline joining 34-27.4S…
    South Atlantic · Southwestern Indian Ocean · South Africa
  50. HYDROLANT 531/202020-02-14 → 2020-03-02
    Survey operations in progress until 01 mar by M/V marion dufresne along trackline joining 34-27.4S…
    South Atlantic · Southwestern Indian Ocean · South Africa

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 17 · seahazards