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 807/192019-03-14 → 2019-03-14
    Underwater operations 140259Z to 160259Z mar by M/V nhi sirius in area within two miles of 24-36.6S 046-41.0W
    Western South Atlantic · Brazil-south Coast
  2. HYDROLANT 806/192019-03-14 → 2019-03-14
    Underwater operations 140259Z to 160259Z mar by M/V nhi sirius in area within two miles of 24-24S 046-37W
    Western South Atlantic · Brazil-south Coast
  3. HYDROLANT 738/192019-03-07 → 2019-03-15
    Survey operations in progress until 14 mar by M/V subsea viking in areas bound by: a. 24-34.75S 042-44.83W,…
    Western South Atlantic · Brazil-south Coast
  4. HYDROLANT 737/192019-03-07 → 2019-03-15
    Survey operations in progress until 14 mar by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic
  5. HYDROLANT 731/192019-03-07 → 2019-03-19
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  6. HYDROLANT 679/192019-03-02 → 2019-03-07
    Survey operations 03 thru 06 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in area…
    Western South Atlantic
  7. HYDROLANT 663/192019-02-28 → 2019-03-08
    Survey operations in progress until 07 mar by M/V kommandor iona in area bound by 22-33S 040-03W, 22-36S…
    Western South Atlantic · Brazil-southeast Coast
  8. HYDROLANT 654/192019-02-28 → 2019-03-08
    Survey operations in progress until 07 mar by M/V subsea viking in area bound by 24-34.75S 042-44.83W,…
    Western South Atlantic · Brazil-south Coast
  9. HYDROLANT 653/192019-02-28 → 2019-03-08
    Survey operations in progress until 07 mar by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  10. HYDROLANT 651/192019-02-28 → 2019-02-28
    Survey operations in progress until 07 mar by M/V kommandor iona in area bound by 22-33S 040-03W, 22-36S…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 648/192019-02-27 → 2019-03-03
    Survey operations in progress until 02 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  12. HYDROLANT 612/192019-02-26 → 2019-03-21
    Survey operations in progress until 20 mar by M/V raisa II in area bound by 03-30.92S 038-11.75W, 03-38.21S…
    Western South Atlantic · Brazil-north Coast
  13. HYDROLANT 593/192019-02-23 → 2019-02-28
    Survey operations in progress until 27 feb by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  14. HYDROLANT 584/192019-02-22 → 2019-02-28
    Survey operations in progress until 28 feb by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  15. HYDROLANT 580/192019-02-21 → 2019-02-28
    Wide berth requested
    Western South Atlantic · Brazil-south Coast
  16. HYDROLANT 556/192019-02-20 → 2019-02-23
    Survey operations in progress until 22 feb by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  17. HYDROLANT 510/192019-02-17 → 2019-03-20
    Survey operations in progress until further notice by M/V bgp pioneer towing seven mile long cable in area…
    Western South Atlantic · Argentina
  18. HYDROLANT 503/192019-02-16 → 2019-02-20
    Survey operations 16 thru 21 feb by M/V haiyangshiyou 720 towing ten 12000 meter long cables in area bound…
    Western South Atlantic
  19. HYDROLANT 477/192019-02-14 → 2019-02-22
    Wide berth requested
    Western South Atlantic · Brazil-south Coast
  20. HYDROLANT 476/192019-02-14 → 2019-02-22
    Survey operations in progress until 21 feb by M/V kommandor iona in area bound by 21-18S 039-58W, 21-18S…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 475/192019-02-14 → 2019-02-22
    Survey operations in progress until 21 feb by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  22. HYDROLANT 470/192019-02-13 → 2019-03-07
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  23. HYDROLANT 460/192019-02-12 → 2019-02-16
    Survey operations in progress until 15 feb by M/V haiyangshiyou 720 towing ten 11200 meter long cables in…
    Western South Atlantic
  24. HYDROLANT 439/192019-02-09 → 2019-02-14
    Wide berth requested
    Western South Atlantic · Brazil-south Coast
  25. HYDROLANT 438/192019-02-09 → 2019-02-14
    Survey operations in progress until 15 feb by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil
  26. HYDROLANT 415/192019-02-07 → 2019-02-17
    Survey operations in progress until 16 feb by M/V haiyangshiyou 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  27. HYDROLANT 414/192019-02-07 → 2019-02-13
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  28. HYDROLANT 398/192019-02-06 → 2019-03-07
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 25-50.3S 014-43.4E,…
    Eastern South Atlantic · Namibia
  29. HYDROLANT 363/192019-02-04 → 2019-05-07
    Survey operations in progress until further notice by M/V ramform sovereign towing 9000 meter long cables in…
    Eastern South Atlantic · Angola
  30. HYDROLANT 343/192019-02-02 → 2019-02-10
    Survey operations in progress until 09 feb by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  31. HYDROLANT 342/192019-02-02 → 2019-02-07
    Survey operations 02 feb thru 07 feb by M/V haiyangshiyou 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  32. HYDROLANT 327/192019-02-01 → 2019-02-10
    Wide berth requested
    Western South Atlantic · Brazil-south Coast
  33. HYDROLANT 263/192019-01-25 → 2019-02-02
    Survey operations 27 jan thru 01 feb by M/V haiyangshiyou 720 towing ten 11112 meter long cables in area…
    Western South Atlantic
  34. HYDROLANT 245/192019-01-25 → 2019-02-03
    Survey operations in progress until 02 feb by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  35. HYDROLANT 244/192019-01-25 → 2019-01-25
    Survey operations in progress 26 thru 28 jan by M/V haiyangshiyou 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  36. HYDROLANT 242/192019-01-24 → 2019-02-01
    Survey operations in progress until 01 feb by M/V subsea viking with submersible in area bound by 24-33.40S…
    Western South Atlantic · Brazil-south Coast
  37. HYDROLANT 241/192019-01-24 → 2019-01-25
    Survey operations in progress until 27 jan by M/V haiyangshiyou 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  38. HYDROLANT 214/192019-01-22 → 2019-02-21
    Underwater operations in progress until further notice by M/V the explorer in area within three miles of…
    Eastern South Atlantic · Namibia
  39. HYDROLANT 202/192019-01-22 → 2019-01-26
    Survey operation 23 thru 25 jan by M/V hai yang shi you 720 towing ten 11,112 meter long cables in area…
    Western South Atlantic
  40. HYDROLANT 156/192019-01-18 → 2019-01-25
    Survey operations in progress until 25 jan by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  41. HYDROLANT 144/192019-01-17 → 2019-01-20
    Survey operation in progress until 19 jan by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    South Atlantic Ocean · Brazil
  42. HYDROLANT 143/192019-01-16 → 2019-01-24
    Survey operations in progress until 23 jan by M/V kommandor iona in area bound by 22-33S 040-17W, 22-32S…
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 142/192019-01-16 → 2019-01-24
    Survey operations in progress until 23 jan by M/V subsea viking with submersible in area bound by 24-32.25S…
    Western South Atlantic · Brazil-south Coast
  44. HYDROLANT 134/192019-01-16 → 2019-01-18
    Survey operations in progress until 18 jan by M/V vantage towing six 155 meter long cable in area bound by…
    Western South Atlantic · Brazil-south Coast
  45. HYDROLANT 110/192019-01-13 → 2019-01-27
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 26-37.02S…
    Eastern South Atlantic · Namibia
  46. HYDROLANT 91/192019-01-11 → 2019-01-17
    Survey operations in progress until 16 jan by M/V subsea viking with submersible in area bound by 24-31.68S…
    Western South Atlantic · Brazil-south Coast
  47. HYDROLANT 90/192019-01-11 → 2019-01-17
    Survey operations in progress until 16 jan by M/V haiyangshiyou 720 towing ten 11120 meter long cables in…
    Western South Atlantic · Brazil-south Coast
  48. HYDROLANT 89/192019-01-11 → 2019-01-16
    Survey operations in progress until 16 jan by M/V vantage towing six 155 meter long cable in area bound by…
    Western South Atlantic · Brazil-south Coast
  49. HYDROLANT 70/192019-01-08 → 2019-01-11
    Survey operations progress until 11 jan by M/V haiyangshiyou 720 towing ten 11120 meter long cables in area…
    Western South Atlantic · Brazil-south Coast
  50. HYDROLANT 46/192019-01-04 → 2019-01-11
    Survey operations in progress until 11 jan by M/V vantage towing six 155 meter long cables in area bound by…
    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 23 · seahazards