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 1404/192019-05-07 → 2019-05-14
    Survey operations in progress until 141200Z may by M/V nhi sirius in area bound by 25-25.10S 047-52.30W,…
    Western South Atlantic · Brazil-south Coast
  2. HYDROLANT 1397/192019-05-06 → 2019-05-16
    Survey operations in progress until 16 may by M/V subsea viking with submersible in area bound by 24-45.05S…
    Western South Atlantic · Brazil-south Coast
  3. HYDROLANT 1385/192019-05-04 → 2019-05-15
    Underwater operations in progress until 14 may by M/V joides resolution in 57-26.52S 043-21.47W
    Scotia Sea
  4. HYDROLANT 1372/192019-05-03 → 2019-05-08
    Survey operations in progress until 07 may by M/V vantage in area bound by 24-54.37S 042-39.28W, 24-51.43S…
    Western South Atlantic · Brazil-south Coast
  5. HYDROLANT 1371/192019-05-03 → 2019-05-06
    Survey operations in progress until 07 may by M/V subsea viking with submersible in area bound by 24-45.05S…
    Western South Atlantic · Brazil-south Coast
  6. HYDROLANT 1350/192019-05-01 → 2019-06-10
    Underwater operations 1100Z to 2000Z daily 01 may thru 10 jun by M/V anglo saxon and M/V proboat in…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 1329/192019-04-30 → 2019-05-09
    Survey operations 01 thru 08 may by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  8. HYDROLANT 1296/192019-04-26 → 2019-06-30
    Underwater operations 1100Z to 2000Z daily until 30 jun by M/V nord virgo, M/V zatto, and M/V comando-b in…
    Western South Atlantic · Brazil-southeast Coast
  9. HYDROLANT 1295/192019-04-26 → 2019-06-30
    Underwater operations 1100Z to 2000Z daily until 30 jun by M/V tiger lily, M/V zatto, and M/V comando-b in…
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 1285/192019-04-25 → 2019-04-26
    Underwater operations in progress 1100Z to 2000Z daily until 30 jun by MV anglo saxon, M/V zatto and M/V…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 1284/192019-04-25 → 2019-04-25
    Underwater operations in progress 1100Z to 2000Z daily until 30 may by M/V anglo saxon, M/V zatto M/V…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 1283/192019-04-25 → 2019-04-25
    Underwater operations in progress 1100Z to 2000Z daily until 30 may by M/V anglo saxon, M/V zatto and M/V…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 1282/192019-04-25 → 2019-05-03
    Survey operations in progress until 02 may by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  14. HYDROLANT 1251/192019-04-23 → 2019-05-03
    Survey operations 24 apr thru 02 may by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  15. HYDROLANT 1250/192019-04-23 → 2019-05-02
    Survey operations in progress until 021900Z may by M/V nhi sirius in area bound by 25-25.10S 047-52.30W,…
    Western South Atlantic · Brazil-south Coast
  16. HYDROLANT 1230/192019-04-19 → 2019-06-04
    Underwater operations 0800Z to 2300Z daily 19 apr thru 03 jun by M/V sentosa and barge smitbarge 1 in…
    Western South Atlantic · Brazil-north Coast
  17. HYDROLANT 1219/192019-04-18 → 2019-05-03
    Survey operations in progress until 02 may by M/V subsea viking and submersible in area bound by 24-47.05S…
    Western South Atlantic · Brazil-south Coast
  18. HYDROLANT 1218/192019-04-18 → 2019-05-03
    Survey operations in progress until 02 may by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  19. HYDROLANT 1217/192019-04-18 → 2019-04-26
    Survey operations in progress until 25 apr by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  20. HYDROLANT 1191/192019-04-16 → 2019-04-23
    Survey operations in progress until 24 apr by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  21. HYDROLANT 1181/192019-04-16 → 2019-04-16
    Survey operations in progress until 02 may by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  22. HYDROLANT 1165/192019-04-12 → 2019-04-19
    Survey operation in progress until 18 apr by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  23. HYDROLANT 1164/192019-04-12 → 2019-04-19
    Survey operations in progress until 18 apr by M/V kommandor iona in area bound by 24-50S 043-00W, 24-50S…
    Western South Atlantic · Brazil-south Coast
  24. HYDROLANT 1117/192019-04-09 → 2019-04-18
    Underwater operations in progress until 17 apr by M/V seabead constructor with submersible in area bound by…
    Western South Atlantic · Falkland Islands
  25. HYDROLANT 1111/192019-04-09 → 2019-04-16
    Survey operations in progress until 17 apr by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  26. HYDROLANT 1110/192019-04-09 → 2019-04-17
    Survey operations in progress until 171900Z apr by M/V nhi sirius in area bound by 25-25.10S 047-52.30W,…
    Western South Atlantic · Brazil-south Coast
  27. HYDROLANT 1109/192019-04-09 → 2019-04-09
    Underwater operations in progress until 17 apr by M/V seabead constructor with submersible in area bound by…
    Western South Atlantic · Falkland Islands
  28. HYDROLANT 1100/192019-04-08 → 2019-04-19
    Survey operations 09 thru 18 apr by M/V subsea viking with submersible in area bound by 24-49.08S…
    Western South Atlantic · Brazil-south Coast
  29. HYDROLANT 1088/192019-04-06 → 2019-04-21
    Underwater operations in progress until 20 apr by M/V joides resolution in: a. 59-48.00S 041-45.60W
    Scotia Sea · Antarctica
  30. HYDROLANT 1087/192019-04-06 → 2019-04-09
    Survey operations in progress until 10 apr by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  31. HYDROLANT 1061/192019-04-03 → 2019-04-19
    Survey operations in progress until 18 apr by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic
  32. HYDROLANT 1049/192019-04-03 → 2019-04-06
    Survey operations in progress until 11 apr by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  33. HYDROLANT 1034/192019-04-01 → 2019-04-03
    Survey operations 012100Z to 031900Z apr by M/V nhi sirius in area bound by 25-25.10S 047-52.30W, 25-55.00S…
    Western South Atlantic · Brazil-south Coast
  34. HYDROLANT 1016/192019-03-30 → 2019-04-03
    Survey operations 30 mar thru 03 apr by M/V hai yang shi you 720 towing ten 11112 meter long cables in area…
    Western South Atlantic
  35. HYDROLANT 977/192019-03-28 → 2019-04-05
    Survey operations in progress until 04 apr by M/V amazon warrior towing 12 9000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 976/192019-03-28 → 2019-04-10
    Survey operations in progress until 09 apr by M/V subsea viking with submersible in areas bound by: a.…
    Western South Atlantic · Brazil-south Coast
  37. HYDROLANT 943/192019-03-25 → 2019-05-15
    Underwater operations in progress until further notice by M/V the explorer in: a. 29-05.48S 015-52.68E
    Eastern South Atlantic · South Africa
  38. HYDROLANT 936/192019-03-25 → 2019-03-30
    Survey operations 26 mar thru 02 apr by M/V hai yang shi you 720 towing ten 11112 meter long cables in area…
    Western South Atlantic
  39. HYDROLANT 935/192019-03-25 → 2019-04-01
    Survey operations 251200Z mar to 031900Z apr by M/V nhi sirius in area bound by 25-25.10S 047-52.30W,…
    Western South Atlantic · Brazil-south Coast
  40. HYDROLANT 917/192019-03-22 → 2019-03-27
    Survey operations in progress until 26 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  41. HYDROLANT 915/192019-03-22 → 2019-04-04
    Survey operations in progress until 03 apr by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic
  42. HYDROLANT 904/192019-03-21 → 2019-03-28
    Survey operations in progress until 28 mar by M/V subsea viking with submersible in areas bound by: a.…
    Western South Atlantic · Brazil-south Coast
  43. HYDROLANT 903/192019-03-21 → 2019-03-22
    Survey operations in progress until 220900Z mar by M/V nhi sirius in area bound by 25-25.10S 047-52.30W,…
    Western South Atlantic · Brazil-south Coast
  44. HYDROLANT 902/192019-03-21 → 2019-03-29
    Survey operations in progress until 28 mar by M/V amazon warrior towing 12 9000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  45. HYDROLANT 877/192019-03-19 → 2019-05-24
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  46. HYDROLANT 862/192019-03-18 → 2019-03-22
    Survey operations in progress until 21 mar by M/V hai yang shi you 720 towing 11 11112 meter long cables in…
    Western South Atlantic
  47. HYDROLANT 853/192019-03-17 → 2019-03-18
    Survey operations in progress until 21 mar by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  48. HYDROLANT 824/192019-03-14 → 2019-03-21
    Survey operations in progress until 21 mar by M/V subsea viking in areas bound by: a. 24-34.75S 042-44.83W,…
    Western South Atlantic · Brazil-south Coast
  49. HYDROLANT 823/192019-03-14 → 2019-04-05
    Survey operations in progress until 04 apr by M/V kommandor iona in area bound by 24-50.00S 043-00.00W,…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 817/192019-03-14 → 2019-03-16
    Underwater operations 140259Z to 160259Z mar by M/V nhi sirius in area within five miles 24-36.6S 046-41.0W
    Western South Atlantic · Brazil-south Coast

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 22 · seahazards