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 825/212021-03-24 → 2021-04-10
    Survey operations 25 mar thru 09 apr by M/V ramform titan towing 14 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 813/212021-03-23 → 2021-03-30
    Survey operations in progress until 30 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  3. HYDROLANT 785/212021-03-20 → 2021-03-24
    Survey operations in progress until 23 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 784/212021-03-20 → 2021-03-26
    Survey operations in progress until 27 mar by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 753/212021-03-16 → 2021-03-20
    Survey operations in progress until 20 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 741/212021-03-16 → 2021-03-23
    Survey operations in progress until 23 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  7. HYDROLANT 730/212021-03-15 → 2021-03-28
    Survey operations 150900Z thru 280300Z mar by M/V almirante graca aranha H34 in area bound by 29-46.90S…
    Western South Atlantic · Brazil-south Coast
  8. HYDROLANT 729/212021-03-15 → 2021-03-20
    Survey operations 15 thru 20 mar by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  9. HYDROLANT 723/212021-03-14 → 2021-03-17
    Underwater operations in progress until 172100Z mar in 20-22.50S 040-08.78W
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 722/212021-03-14 → 2021-03-17
    Underwater operations in progress until 172100Z mar in 20-23.67S 040-07.08W
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 696/212021-03-11 → 2021-03-16
    Survey operations in progress until 17 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 677/212021-03-08 → 2021-03-16
    Survey operations 09 thru 16 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in area…
    Western South Atlantic · Brazil-east Coast
  13. HYDROLANT 647/212021-03-05 → 2021-04-01
    Underwater operations 09 thru 31 mar by M/V thalassa in: a. 00-00S 010-00W
    South Atlantic
  14. HYDROLANT 637/212021-03-05 → 2021-03-14
    Survey operations 05 thru 13 mar by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  15. HYDROLANT 610/212021-03-03 → 2021-03-11
    Survey operations in progress until 10 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 605/212021-03-02 → 2021-03-09
    Survey operations until 08 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in area bound…
    Western South Atlantic · Brazil-east Coast
  17. HYDROLANT 600/212021-03-01 → 2021-04-13
    Underwater operations 03 mar to 12 apr by M/V thalassa in: a. 06-00S 010-00W
    South Atlantic
  18. HYDROLANT 599/212021-03-01 → 2021-03-29
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-07.7S…
    Eastern South Atlantic · Namibia
  19. HYDROLANT 551/212021-02-26 → 2021-03-05
    Survey operations 26 feb thru 06 mar by M/V oceanic sirius towing 12 11112 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 544/212021-02-25 → 2021-03-01
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-49.8S…
    Eastern South Atlantic · Namibia
  21. HYDROLANT 524/212021-02-24 → 2021-03-04
    Survey operations in progress until 03 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  22. HYDROLANT 523/212021-02-23 → 2021-03-03
    Survey operations until 02 mar by M/V hai yang shi you 720 towing ten 11112 meter long cables in area bound…
    Western South Atlantic · Brazil-east Coast
  23. HYDROLANT 507/212021-02-22 → 2021-02-24
    Survey operations in progress until 25 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 477/212021-02-19 → 2021-02-22
    Survey operations in progress until 24 feb by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  25. HYDROLANT 476/212021-02-19 → 2021-02-26
    Survey operations in progress until 27 feb by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 459/212021-02-17 → 2021-02-23
    Underwater operations 0700Z to 1700Z daily 18 thru 23 feb by M/V nm berge rishiri and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 458/212021-02-17 → 2021-02-23
    Underwater operations 1000Z to 1700Z daily 18 thru 23 feb by M/V open sea I and M/V nm wookie in 20-19.0S…
    Western South Atlantic · Brazil-southeast Coast
  28. HYDROLANT 445/212021-02-15 → 2021-02-24
    Survey operations 16 feb thru 23 feb by M/V hai yang shi you 720 towing ten 11112 meter long cables in area…
    Western South Atlantic · Brazil-east Coast
  29. HYDROLANT 420/212021-02-12 → 2021-02-19
    Survey operations in progress until 16 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 419/212021-02-12 → 2021-02-19
    Survey operations in progress until 20 feb by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 388/212021-02-09 → 2021-02-23
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-49.8S…
    Eastern South Atlantic · Namibia
  32. HYDROLANT 379/212021-02-09 → 2021-03-05
    Underwater operations in progress until further notice by M/V the explorer in: a. 26-49.8S 015-04.1E
    Eastern South Atlantic · Namibia
  33. HYDROLANT 374/212021-02-08 → 2021-02-12
    Survey operations in progress until 13 mar by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 373/212021-02-08 → 2021-02-15
    Survey operations in progress 09 thru 15 feb by M/V hai yang shi you 720 towing ten 11112 meter long cables…
    Western South Atlantic · Brazil-east Coast
  35. HYDROLANT 335/212021-02-05 → 2021-02-08
    Survey operations in progress until 09 feb by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 334/212021-02-05 → 2021-02-14
    Survey operations in progress until 13 feb by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 300/212021-02-02 → 2021-02-08
    Survey operations in progress until 08 feb by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  38. HYDROLANT 298/212021-02-01 → 2021-02-05
    Survey operations in progress until 22 feb by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 267/212021-01-29 → 2021-02-05
    Survey operations in progress until 06 feb by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 255/212021-01-28 → 2021-02-01
    Survey operations in progress until 03 feb by M/V ramform titan towing 14 100000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 252/212021-01-27 → 2021-02-04
    Survey operations in progress until 03 feb by M/V polarcus naila towing 12 7000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  42. HYDROLANT 230/212021-01-26 → 2021-01-27
    Survey operations 25 and 26 jan by M/V ramform titan towing 14 10000 meter cables in area bound by 23-47.7S…
    Western South Atlantic
  43. HYDROLANT 229/212021-01-26 → 2021-02-02
    Survey operations 26 jan thru 02 feb by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-east Coast
  44. HYDROLANT 210/212021-01-23 → 2021-01-26
    Survey operations in progress until 25 jan by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  45. HYDROLANT 209/212021-01-23 → 2021-01-29
    Underwater operations 1000Z to 2000Z daily 24 thru 29 jan by M/V maersk kalea and M/V open sea I in…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 202/212021-01-22 → 2021-01-25
    Underwater operations 1100Z to 2100Z daily 22 jan thru 25 jan by M/V aom gaia in 20-23.77S 040-07.83W
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 201/212021-01-22 → 2021-01-25
    Underwater operations 1100Z to 2100Z daily 22 jan thru 25 jan by M/V fadelsia in 20-23.72S 040-08.13W
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 200/212021-01-22 → 2021-01-29
    Survey operations in progress until 30 jan by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 181/212021-01-20 → 2021-01-26
    Survey operations in progress thru 27 jan by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 180/212021-01-19 → 2021-01-28
    Survey operations in progress thru 27 jan by M/V polarcus naila towing 12 7000 meter long cables in area…
    Western South Atlantic · Brazil-southeast 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 14 · seahazards