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 968/222022-04-05 → 2022-04-12
    Survey operations in progress until 12 apr by M/V sw diamond in area bound by 24-56S 042-59W, 25-02S…
    Western South Atlantic
  2. HYDROLANT 967/222022-04-05 → 2022-04-06
    Survey operations in progress until 11 apr by M/V sw empress towing 14 five meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  3. HYDROLANT 964/222022-04-04 → 2022-04-11
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · South Africa
  4. HYDROLANT 919/222022-03-31 → 2022-04-02
    Underwater operations 311100Z mar to 022000Z apr by M/V bartira II and M/V mapele I in 13-26.53S 038-38.80W
    Western South Atlantic · Brazil-east Coast
  5. HYDROLANT 907/222022-03-30 → 2022-04-06
    Underwater operations 1100Z to 2000Z daily 30 mar thru 06 apr in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  6. HYDROLANT 890/222022-03-29 → 2022-04-09
    Underwater operations in progress until 090300Z apr by M/V ostreiro in 25-12.25S 042-52.77W
    Western South Atlantic
  7. HYDROLANT 889/222022-03-29 → 2022-04-05
    Survey operations in progress until 04 apr by M/V sw empress towing 12 5556 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  8. HYDROLANT 888/222022-03-29 → 2022-04-05
    Survey operations in progress until 05 apr by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic
  9. HYDROLANT 820/222022-03-21 → 2022-03-22
    Underwater operations in progress until 220300Z mar by M/V skandi niteroi and M/V polares IX in 25-52.60S…
    Western South Atlantic
  10. HYDROLANT 819/222022-03-21 → 2022-03-26
    Underwater operations in progress until 260300Z mar by M/V ostreiro in 25-12.25S 042-52.77W
    Western South Atlantic
  11. HYDROLANT 808/222022-03-20 → 2022-03-29
    Survey operations 22 thru 28 mar by M/V sw empress towing 12 5556 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 803/222022-03-19 → 2022-03-25
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · Namibia
  13. HYDROLANT 759/222022-03-15 → 2022-03-30
    Underwater operations 1100Z to 2000Z daily 12 thru 30 mar by M/V open seas I and MV cpt dimitros in…
    Western South Atlantic · Brazil-south Coast
  14. HYDROLANT 758/222022-03-15 → 2022-03-20
    Underwater operations 1100Z to 2000Z daily 13 thru 20 mar by M/V big john VI, MV pella e, and MV star…
    Western South Atlantic · Brazil-south Coast
  15. HYDROLANT 757/222022-03-15 → 2022-03-15
    Underwater operations 1100Z to 2000Z daily 12 thru 19 mar by M/V big john VI and first ski, berge phan XI…
    Western South Atlantic · Brazil-south Coast
  16. HYDROLANT 747/222022-03-15 → 2022-03-23
    Survey operations in progress until 22 mar by M/V sw diamond in area bound by 25-18.27S 042-42.22W,…
    Western South Atlantic
  17. HYDROLANT 746/222022-03-15 → 2022-03-26
    Underwater operations in progress until 260300Z mar by M/V ostreiro in 25-01.48S 042-40.08W wide berth…
    Western South Atlantic
  18. HYDROLANT 643/222022-03-03 → 2022-03-04
    Underwater operations 1000Z to 2000Z daily 02 thru 16 mar in vicinity of trackline joining 21-50.13S…
    Western South Atlantic · Brazil-southeast Coast
  19. HYDROLANT 642/222022-03-03 → 2022-03-04
    Underwater operations 031000Z to 042000Z mar in 21-48.48S 040-50.90W
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 632/222022-03-03 → 2022-03-08
    Underwater operations 1100Z to 2000Z daily 03 thru 08 mar by M/V mount hikurance in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  21. HYDROLANT 631/222022-03-03 → 2022-03-10
    Underwater operations 1100Z to 2000Z daily 03 thru 10 mar by M/V big john VI and M/V elva in 24-11.00S…
    Western South Atlantic · Brazil-south Coast
  22. HYDROLANT 630/222022-03-03 → 2022-03-10
    Underwater operations 1100Z to 2000Z daily 03 thru 10 mar by M/V ikan kerapu, M/V nicosia pegasus, M/V…
    Western South Atlantic · Brazil-south Coast
  23. HYDROLANT 608/222022-03-01 → 2022-03-08
    Survey operations in progress until 07 mar by M/V sw empress towing 12 5556 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 579/222022-02-26 → 2022-03-17
    Survey operations in progress until 16 mar by M/V sarmiento de gamboa along trackline joining 34-30.0S…
    South Atlantic · South Africa
  25. HYDROLANT 555/222022-02-24 → 2022-02-24
    Underwater operations in progress until 242000Z feb in 21-50.13S 040-47.78W
    Western South Atlantic · Brazil
  26. HYDROLANT 525/222022-02-22 → 2022-04-08
    Underwater operations 25 feb thru 07 apr by M/V thalassa in: a. 00-00S 010-00W
    South Atlantic
  27. HYDROLANT 517/222022-02-21 → 2022-02-22
    Underwater operations 25 feb thru 07 apr by M/V thalassa in area bound by 00-00S 010-00W, 06-00S 010-00W,…
    South Atlantic · Eastern North Atlantic
  28. HYDROLANT 485/222022-02-19 → 2022-02-27
    Underwater operations 1100Z to 2000Z daily 20 thru 27 feb by M/V explorer oceania in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  29. HYDROLANT 482/222022-02-19 → 2022-02-26
    Underwater operations 1100Z to 2000Z daily 19 thru 26 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  30. HYDROLANT 456/222022-02-16 → 2022-02-20
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-57.79S…
    Eastern South Atlantic · Namibia
  31. HYDROLANT 446/222022-02-14 → 2022-02-23
    Survey operations 15 thru 22 feb by M/V sw diamond towing two 225 meter long cables in area bound by…
    Western South Atlantic
  32. HYDROLANT 445/222022-02-14 → 2022-02-22
    Survey operations 15 thru 21 feb by M/V sw empress towing 12 5556 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  33. HYDROLANT 441/222022-02-14 → 2022-02-18
    Underwater operations in progress until further notice by M/V bourbon ruby, M/V bourbon rainbow and M/V…
    Eastern South Atlantic
  34. HYDROLANT 410/222022-02-10 → 2022-02-16
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-49.72S…
    Eastern South Atlantic · Namibia
  35. HYDROLANT 408/222022-02-10 → 2022-02-11
    Underwater operations 1100Z to 2000Z daily 10 thru 17 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  36. HYDROLANT 407/222022-02-10 → 2022-02-11
    Underwater operations 1100Z to 2000Z daily 10 thru 17 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  37. HYDROLANT 406/222022-02-10 → 2022-02-11
    Underwater operations 1100Z to 2000Z daily 10 thru 17 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  38. HYDROLANT 405/222022-02-10 → 2022-02-17
    Underwater operations 1100Z to 2000Z daily 10 thru 17 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  39. HYDROLANT 398/222022-02-09 → 2022-02-14
    Underwater operations 1100Z to 2000Z daily 09 thru 14 feb by M/V yangze 6 and M/V big john VI in 24-11S…
    Western South Atlantic · Brazil-south Coast
  40. HYDROLANT 397/222022-02-09 → 2022-02-28
    Underwater operations 1100Z to 2000Z daily 09 thru 28 feb by M/V gioegakis and M/V open seas I in 24-07.42S…
    Western South Atlantic · Brazil-south Coast
  41. HYDROLANT 396/222022-02-09 → 2022-03-01
    Underwater operations 1100Z to 2000Z daily 09 feb thru 01 mar by M/V santa virginia and M/V open seas I in…
    Western South Atlantic · Brazil-south Coast
  42. HYDROLANT 395/222022-02-09 → 2022-02-12
    Underwater operations 1100Z to 2000Z daily 09 thru 12 feb by M/V amazon victory and M/V big john VI in…
    Western South Atlantic · Brazil-south Coast
  43. HYDROLANT 394/222022-02-09 → 2022-02-14
    Underwater operations 1100Z to 2000Z daily 09 thru 14 feb by M/V kerveros and M/V open seas I in 24-07.83S…
    Western South Atlantic · Bbrazil-south Coast
  44. HYDROLANT 393/222022-02-09 → 2022-02-16
    Underwater operations 1100Z to 2000Z daily 09 thru 16 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  45. HYDROLANT 392/222022-02-09 → 2022-02-15
    Underwater operations 1100Z to 2000Z daily 09 thru 15 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  46. HYDROLANT 391/222022-02-09 → 2022-02-15
    Underwater operations 1100Z to 2000Z daily 09 thru 15 feb in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  47. HYDROLANT 390/222022-02-09 → 2022-02-14
    Underwater operations 1100Z to 2000Z daily 09 thru 14 feb by M/V cl daysi and M/V big john VI in 24-11S…
    Western South Atlantic · Brazil-south Coast
  48. HYDROLANT 389/222022-02-08 → 2022-02-13
    Underwater operations in progress until 12 feb by M/V jy pacific in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  49. HYDROLANT 388/222022-02-08 → 2022-02-11
    Underwater operations in progress until 10 feb by M/V ivestos 5 in 24-08.02S 046-14.28W
    Western South Atlantic · Brazil-south Coast
  50. HYDROLANT 380/222022-02-08 → 2022-02-14
    Survey operations in progress until 15 feb by M/V sw diamond towing two 225 meter long cables in area bound…
    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 9 · seahazards