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
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15
16
17
18
19
20
21
22
23
24
25
26

By month (all years)

J
F
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Other hazards in the South Atlantic Ocean

Archive · 2,275 cancelled

  1. HYDROLANT 1202/172017-04-14 → 2017-04-23
    Survey operations 15 thru 22 apr by M/V oceanic champion towing 12 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 1199/172017-04-14 → 2017-04-16
    Survey operations in progress until further notice by M/V bgp pioneer towing seven mile long cable in area…
    Western South Atlantic · Argentia
  3. HYDROLANT 1196/172017-04-14 → 2017-04-17
    Survey operations 14 thru 16 apr by M/V polarcus alima towing 12 8100 meter long cables along tracklines…
    Western South Atlantic
  4. HYDROLANT 1161/172017-04-11 → 2017-04-14
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 11 and 12 apr along trackline…
    Western South Atlantic
  5. HYDROLANT 1159/172017-04-11 → 2017-04-11
    Survey operations 12 apr by M/V polarcus alima towing 12 8100 meter long cables along trackline between…
    Western South Atlantic
  6. HYDROLANT 1146/172017-04-09 → 2017-04-12
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 09 apr along trackline joining…
    Western South Atlantic
  7. HYDROLANT 1138/172017-04-08 → 2017-04-10
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 08 apr along trackline between…
    Western South Atlantic
  8. HYDROLANT 1133/172017-04-08 → 2017-04-16
    Survey operations in progress until 15 apr by M/V oceanic champion towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  9. HYDROLANT 1130/172017-04-07 → 2017-04-10
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 07 apr along trackline between…
    Western South Atlantic
  10. HYDROLANT 1117/172017-04-06 → 2017-04-09
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 06 apr along trackline between…
    Western South Atlantic
  11. HYDROLANT 1113/172017-04-06 → 2017-04-12
    Survey operations in progress until 172200Z apr by M/V dp star towing 100 meter long cable in area bound by…
    Eastern South Atlantic · South Africa
  12. HYDROLANT 1104/172017-04-05 → 2017-04-25
    Underwater operations 1130Z to 2100Z daily 07 thru 25 apr by M/V aurilia and M/V comando-b in 20-18S 040-07W
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 1102/172017-04-05 → 2017-04-07
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 05 apr along trackline between…
    Western South Atlantic
  14. HYDROLANT 1079/172017-04-03 → 2017-04-05
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 03 apr along trackline between…
    Western South Atlantic
  15. HYDROLANT 1073/172017-04-02 → 2017-04-03
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 02 apr along trackline between…
    Western South Atlantic
  16. HYDROLANT 1066/172017-04-01 → 2017-04-02
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 01 apr along trackline between…
    Western South Atlantic
  17. HYDROLANT 1042/172017-03-31 → 2017-04-09
    Survey operations 01 thru 08 apr by M/V oceanic champion towing 12 9260 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  18. HYDROLANT 1041/172017-03-31 → 2017-04-15
    Underwater operations 1130Z to 2100Z daily 01 thru 15 apr by M/V alta-navegacao, M/V babitonga bay and M/V…
    Western South Atlantic · Brazil-southeast Coast
  19. HYDROLANT 1040/172017-03-31 → 2017-04-15
    Underwater operations 1130Z to 2100Z daily 01 thru 15 apr by M/V alta-navegacao, M/V sbi mazurka and M/V…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 1034/172017-03-30 → 2017-04-02
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 30 mar along trackline between…
    Western South Atlantic
  21. HYDROLANT 1026/172017-03-30 → 2017-03-30
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 30 mar along trackline between…
    Western South Atlantic
  22. HYDROLANT 988/172017-03-27 → 2017-03-31
    Survey operations in progress until 010400Z apr by M/V oceanic champion towing 12 7408 meter long cables in…
    Western South Atlantic · Brazil-southeast Coast
  23. HYDROLANT 984/172017-03-27 → 2017-03-30
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 27 mar along trackline between…
    Western South Atlantic
  24. HYDROLANT 981/172017-03-27 → 2017-05-29
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-30.7S 015-49.7E
    Eastern South Atlantic · Namibia
  25. HYDROLANT 965/172017-03-25 → 2017-03-28
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 25 mar along trackline between…
    Western South Atlantic
  26. HYDROLANT 959/172017-03-25 → 2017-03-27
    Survey operations in progress until 01 apr by M/V oceanic champion towing 12 7408 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 953/172017-03-24 → 2017-03-27
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 24 mar along trackline between…
    Western South Atlantic
  28. HYDROLANT 935/172017-03-23 → 2017-03-26
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 23 mar along trackline between…
    Western South Atlantic
  29. HYDROLANT 926/172017-03-22 → 2017-03-23
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 22 mar along trackline between…
    Western South Atlantic
  30. HYDROLANT 920/172017-03-21 → 2017-03-23
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 21 mar along trackline between…
    Western South Atlantic
  31. HYDROLANT 911/172017-03-21 → 2017-03-26
    Survey operations in progress until 25 mar by M/V oceanic champion towing 12 7408 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 907/172017-03-20 → 2017-03-21
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 20 mar along trackline between…
    Western South Atlantic
  33. HYDROLANT 903/172017-03-20 → 2017-05-02
    Survey operations in progress until 07 may by M/V ramform sterling towing 4.3 milie long cable in area bound…
    Eastern South Atlantic · Angola
  34. HYDROLANT 892/172017-03-19 → 2017-03-20
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 19 mar along trackline between…
    Western South Atlantic
  35. HYDROLANT 887/172017-03-19 → 2017-03-20
    Survey operations until 19 mar by M/V polarcus alima towing 12 8100 meter long cables along tracklines…
    Western South Atlantic
  36. HYDROLANT 876/172017-03-18 → 2017-03-20
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 18 mar along trackline between…
    Western South Atlantic
  37. HYDROLANT 871/172017-03-17 → 2017-03-26
    Survey operations 18 thru 25 mar by M/V polarcus adira towing 9000 meter long cable in area bound by 22-51S…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 858/172017-03-17 → 2017-03-17
    Survey operations 18 thru 25 mar by M/V polarcus adira towing 9000 meter long cable in area bound by 22-51S…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 845/172017-03-15 → 2017-03-17
    Survey operations in progress until 16 mar by M/V polarcus alima towing 12 8100 meter long cables along…
    Western South Atlantic
  40. HYDROLANT 824/172017-03-14 → 2017-03-16
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 14 mar…
    Western South Atlantic · Uruguay
  41. HYDROLANT 820/172017-03-13 → 2017-03-14
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 13 and…
    Western South Atlantic · Uruguay
  42. HYDROLANT 802/172017-03-11 → 2017-03-14
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 11 mar…
    Western South Atlantic · Uruguay
  43. HYDROLANT 798/172017-03-11 → 2017-03-19
    Survey operations in progress until 18 mar by M/V oceanic champion towing 12 7408 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 785/172017-03-10 → 2017-03-13
    Rio de la plata
    Western South Atlantic
  45. HYDROLANT 763/172017-03-08 → 2017-03-10
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 08 mar…
    Western South Atlantic
  46. HYDROLANT 748/172017-03-07 → 2017-03-15
    Underwater operations 1100Z to 2100Z daily 08 thru 15 mar by M/V tiger jiangsu and M/V seamar III in…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 745/172017-03-07 → 2017-03-20
    Underwater operations 1130Z to 2100Z daily 07 thru 20 mar by M/V lokholmen and M/V comando-b in 20-19.33S…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 744/172017-03-07 → 2017-03-20
    Underwater operations 1130Z to 2100Z daily 07 thru 20 mar by M/V robusto and M/V comando-b in 20-18.00S…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 743/172017-03-07 → 2017-03-09
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 06 mar…
    Western South Atlantic
  50. HYDROLANT 731/172017-03-05 → 2017-03-07
    Survey operations by M/V polarcus alima towing 12 8100 meter long cables along tracklines between: a. 05 mar…
    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 30 · seahazards