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. HYDROPAC 523/202020-02-13 → 2020-02-14
    Survey operations in progress until 01 mar by M/V marion dufresne along trackline joining 34-27.4S…
    South Atlantic · Southwestern Indian Ocean · South Africa
  2. HYDROLANT 521/202020-02-13 → 2020-02-14
    Survey operations in progress until 01 mar by M/V marion dufresne along trackline joining 34-27.4S…
    South Atlantic · Southwestern Indian Ocean · South Africa
  3. HYDROLANT 520/202020-02-13 → 2020-02-18
    Underwater operations 16 feb thru 23 mar by M/V thalassa in area bound by 00-00S 023-00W, 00-00S 000-00W,…
    South Atlantic
  4. HYDROLANT 510/202020-02-12 → 2020-02-13
    Underwater operations 16 feb thru 23 mar by M/V thalassa in area bound by 00-00S 010-00W, 00-00S 000-00W,…
    South Atlantic
  5. HYDROLANT 485/202020-02-11 → 2020-02-18
    Survey operations in progress until 18 feb by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 439/202020-02-08 → 2020-02-16
    Survey operations in progress until 15 feb by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 384/202020-02-03 → 2020-02-11
    Survey operations 04 thru 11 feb by M/V ivan gubkin towing ten 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  8. HYDROLANT 371/202020-02-03 → 2020-02-07
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-31.2S 015-49.2E
    Eastern South Atlantic · Namibia
  9. HYDROLANT 352/202020-02-01 → 2020-02-09
    Survey operations in progress until 08 feb by M/V geo caribbean towing ten 12000 meter 22-43.80S 038-26.43W,…
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 338/202020-01-30 → 2020-02-06
    Survey operations 29 jan thru 05 feb by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  11. HYDROLANT 300/202020-01-28 → 2020-08-25
    Survey operations in progress until further notice by M/V ramform sovereign towing 8025 meter long cables in…
    Eastern South Atlantic · Angola
  12. HYDROLANT 297/202020-01-27 → 2020-02-05
    Survey operations in progress until 04 feb by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 278/202020-01-26 → 2020-01-30
    Survey operations 26 thru 30 jan by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  14. HYDROLANT 244/202020-01-24 → 2020-02-01
    Survey operations in progress until 01 feb by M/V geo caribbean towing ten 12000 meter 22-43.80S 038-26.43W,…
    Western South Atlantic · Brazil-southeast Coast
  15. HYDROLANT 189/202020-01-20 → 2020-01-27
    Survey operations in progress until 26 jan by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  16. HYDROLANT 176/202020-01-17 → 2020-01-24
    Survey operations 18 thru 25 jan by M/V geo caribbean towing ten 12000 meter 22-43.80S 038-26.43W, 22-43.18S…
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 160/202020-01-16 → 2020-01-29
    Survey operations in progress 17 thru 28 jan by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic
  18. HYDROLANT 119/202020-01-14 → 2020-01-22
    Survey operations in progress until 21 jan by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic
  19. HYDROLANT 118/202020-01-14 → 2020-01-20
    Survey operations 14 thru 21 jan by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  20. HYDROLANT 78/202020-01-10 → 2020-01-14
    Survey operations in progress until 17 jan by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 76/202020-01-10 → 2020-01-19
    Survey operations 11 thru 18 jan by M/V geo caribbean towing ten 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  22. HYDROLANT 67/202020-01-08 → 2020-01-09
    Survey operations in progress until 17 jan 20 by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic
  23. HYDROLANT 36/202020-01-04 → 2020-01-12
    Survey operations in progress until 11 jan by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 26/202020-01-02 → 2020-01-08
    Survey operations in progress until 07 jan 20 by M/V ivan gubkin towing ten 10000 meter long cables in area…
    Western South Atlantic
  25. HYDROLANT 3991/192019-12-29 → 2020-01-07
    Survey operations 31 dec thru 06 jan 20 by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  26. HYDROLANT 3986/192019-12-28 → 2020-01-04
    Survey operations in progress until 04 jan 20 by M/V geo caribbean towing ten 13000 meter long cables in…
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 3985/192019-12-28 → 2020-01-02
    Survey operations in progress until 02 jan 20 by M/V ivan gubkin towing ten 8000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  28. HYDROLANT 3969/192019-12-27 → 2020-02-10
    Underwater operations 0800Z to 1700Z daily 27 dec thru 15 feb 20 by M/V pegasus in 20-24.13S 040-11.87W
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 3958/192019-12-25 → 2020-01-10
    Underwater operations in progress until further notice by M/V explorer in area bound by 28-54.32S…
    South Atlantic · South Africa
  30. HYDROLANT 3907/192019-12-19 → 2019-12-29
    Survey operations 21 thru 28 dec by M/V geo caribbean towing ten 13,000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROPAC 4207/192019-12-19 → 2020-04-24
    Survey operations in progress until 30 apr 20 by M/V ramform atlas towing ten seven mile long cables in area…
    Eastern South Atlantic · South Africa
  32. HYDROLANT 3899/192019-12-19 → 2020-04-23
    Survey operations in progress until 30 apr 20 by M/V ramform atlas towing ten seven mile long cables in area…
    Eastern South Atlantic · Southwestern Indian Ocean · South Africa
  33. HYDROLANT 3868/192019-12-17 → 2019-12-21
    Survey operations 17 thru 20 dec by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  34. HYDROLANT 3847/192019-12-15 → 2020-01-28
    Underwater operations 1100Z to 2000Z daily until 31 jan by M/V new athens in 20-23.37S 040-08.97W
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 3816/192019-12-13 → 2019-12-22
    Survey operations in progress until 21 dec by M/V geo caribbean towing 12 10,372 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 3787/192019-12-10 → 2019-12-25
    Underwater operations in progress until further notice by M/V the explorer in area bound by 28-43.6S…
    Eastern South Atlantic · South Africa
  37. HYDROLANT 3727/192019-12-05 → 2019-12-18
    Underwater operations 1000Z to 2000Z daily 05 thru 18 dec by M/V star sky and M/V santiago in 20-23.28S…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 3726/192019-12-05 → 2020-01-31
    Underwater operations 1100Z to 2000Z daily 05 dec thru 31 jan by M/V maersk kalea in 20-22.40S 040-09.40W
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 3725/192019-12-05 → 2020-01-31
    Underwater operations 1000Z to 2000Z daily 05 dec thru 31 jan by M/V pola atlantic in 20-23.08S 040-08.02W
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 3724/192019-12-05 → 2020-01-31
    Underwater operations 1100Z to 2000Z daily 05 dec thru 31 jan by M/V romoe maersk in 20-23.78S 040-14.27W
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 3715/192019-12-04 → 2020-02-10
    Survey operations in progress until further notice by M/V ramform vanguard towing ten 7950 meter long cables…
    Eastern South Atlantic · Angola
  42. HYDROLANT 3684/192019-11-30 → 2019-12-06
    Survey operations in progress until 05 dec by M/V hai yang shi you 720 towing ten 12000 meter long cables,…
    Western South Atlantic
  43. HYDROLANT 3678/192019-11-29 → 2019-12-08
    Survey operations in progress until 07 dec by M/V geo caribbean towing 12 10400 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 3597/192019-11-24 → 2020-02-05
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 25-50.5S 014-43.3E,…
    Eastern South Atlantic · Namibia
  45. HYDROLANT 3590/192019-11-23 → 2020-01-31
    Underwater operations 1100Z to 2000Z daily 24 nov thru 31 jan 20 by M/V sinocart beijing in 20-18.32S…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 3588/192019-11-23 → 2019-11-25
    Underwater operations 1100Z to 2000Z daily 23 nov thru 31 jan 20 by M/V orient trail in 20-22.25S 040-08.07W
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 3587/192019-11-23 → 2020-02-01
    Underwater operations 1100Z to 2000Z daily 24 nov thru 31 jan 20 by M/V topeka in 20-17.50S 040-10.62W
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 3586/192019-11-23 → 2020-01-09
    Underwater operations 1100Z to 2000Z daily 23 nov thru 30 dec by M/V western lucrezia in 20-22.88S 040-15.67W
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 3584/192019-11-22 → 2019-12-18
    Underwater operations 1000Z to 2200Z daily 24 nov thru 18 dec by M/V ioannis r and M/V sea e mar III in…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 3559/192019-11-21 → 2020-01-10
    Underwater operations in progress until further notice by M/V explorer in: a. 27-40.3S 015-30.6E
    Eastern South Atlantic · Namibia

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 18 · seahazards