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 · 268 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 · 177 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 · 67 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 1241/052005-07-04 → 2005-07-08
    Survey operations in progress until 100300Z jul by vessel fugro explorer in area bound by 11-14.7S…
  2. HYDROLANT 1237/052005-07-03 → 2005-07-04
    Survey operations 040300Z to 070300Z jul by M/V fugro explorer in area bound by 11-14.7S 037-08.5W, 11-14.3S…
  3. HYDROLANT 964/052005-05-21 → 2005-05-24
    Survey operations 220300Z to 240259Z may by M/V fugro explorer vicinity 22-08.5S 040-09.4W
  4. HYDROLANT 913/052005-05-14 → 2005-05-17
    Survey operations in progress until 170259Z may by vessel fugro explorer vicinity 22-10.2S 040-07.2W
  5. HYDROLANT 912/052005-05-14 → 2005-06-01
    Survey operations 16 thru 31 may by vessel taurus in area bound by 23-14.1S 042-21.0W, 23-14.1S 041-52.5W,…
  6. HYDROLANT 861/052005-05-07 → 2005-05-11
    Survey operations in progress until 110259Z may by M/V fugro explorer in 24-21S 044-22W
  7. HYDROLANT 839/052005-05-05 → 2005-05-07
    Survey operations in progress until 070259Z may by M/V fugro explorer in 24-21S 044-22W
  8. HYDROLANT 765/052005-04-23 → 2005-04-27
    Underwater survey operations in progress until 270259Z apr by M/V ocean surveyor in area bound by 22-00S…
  9. HYDROLANT 728/052005-04-19 → 2005-04-23
    Underwater survey operations in progress until 230259Z apr in area bound by 22-00S 040-06W, 22-01S 040-03W,…
  10. HYDROLANT 554/052005-03-27 → 2005-03-29
    Survey operations 30 mar thru 27 apr by M/V sirius along trackline between 17-10S 036-50W and 18-50S 038-10W
  11. HYDROLANT 493/052005-03-16 → 2005-03-31
    Survey operations 18 thru 30 mar by M/V beautemps beaupre in area bound by 00-00 008-30E, 05-30S 005-30E,…
  12. HYDROLANT 468/052005-03-11 → 2005-06-01
    Underwater operations in progress until 31 may within eight miles of 05-37.0S 011-45.5E
  13. HYDROLANT 423/052005-03-02 → 2005-03-15
    Oceanographic survey 03 thru 14 mar by M/V beautemps beaupre in area bound by 00-34S 008-52E, 00-01S…
  14. HYDROLANT 381/052005-02-25 → 2005-03-03
    Hydrographic survey 01 and 02 mar by M/V taurus in area bound by 23-04.3S 043-01.1W, 23-04.3S 042-57.9W,…
  15. HYDROLANT 100/052005-01-14 → 2005-01-15
    Survey operations 120300Z thru 150300Z jan by M/V copernaut franca towing 75 meter long cable in area bound…
  16. HYDROLANT 2009/042004-12-16 → 2004-12-19
    Oceanographic operations in progress until 200300Z dec along trackline between 03-04.00S 038-56.10W and…
  17. HYDROLANT 1959/042004-12-08 → 2004-12-18
    Hydrographic survey 071200Z to 180159Z dec by M/V oyarvide in area bound by 34-30S 053-35W, 34-36S 053-30W,…
  18. HYDROLANT 1956/042004-12-07 → 2004-12-11
    Survey operations in progress until 110259Z dec by M/V ocean explorer towing 6000 meter long cable in area…
  19. HYDROLANT 1955/042004-12-07 → 2004-12-08
    Survey operations in progress until 080259Z dec by M/V ocean explorer towing 6000 meter long cable in area…
  20. HYDROLANT 1945/042004-12-06 → 2004-12-07
    Survey operations in progress until 070259Z dec by M/V ocean explorer towing 6000 meter long cable in area…
  21. HYDROLANT 1939/042004-12-05 → 2004-12-08
    Oceanographic operations by M/V ocean surveyor towing 75 meter long cable: a. 040300Z to 070300Z dec in area…
  22. HYDROLANT 1920/042004-12-01 → 2004-12-05
    Oceanographic operations by M/V ocean surveyor towing 75 meter long cable: a. 020300Z to 030300Z dec in area…
  23. HYDROLANT 1913/042004-11-30 → 2004-12-01
    Oceanographic operations in progress until 050300Z dec by M/V ocean surveyor towing 75 meter long cable in…
  24. HYDROLANT 1897/042004-11-25 → 2004-11-28
    Oceanographic operations in progress until 280300Z nov by M/V ocean surveyor towing 75 meter long cable in…
  25. HYDROLANT 1722/042004-10-24 → 2004-10-27
    Oceanographic operations in progress until 26 oct by M/V ocean surveyor towing 84 meter long cable in area…
  26. HYDROLANT 1689/042004-10-19 → 2004-10-24
    Oceanographic operations 19, 20, 22, 23 and 24 oct by M/V ocean surveyor towing 84 meter long cable in area…
  27. HYDROLANT 1668/042004-10-15 → 2004-10-19
    Oceanographic operations 15 thru 18 oct by M/V ocean surveyor towing 84 meter long cable in area bound by…
  28. HYDROLANT 1662/042004-10-13 → 2004-10-15
    Oceanographic operations 12 thru 14 oct by M/V ocean surveyor towing 84 meter long cable in area bound by…
  29. HYDROLANT 1652/042004-10-12 → 2004-10-13
    Oceanographic operations 12 thru 14 oct by M/V ocean surveyor towing 84 meter long cable in area bound by…
  30. HYDROLANT 1650/042004-10-11 → 2004-10-12
    Oceanographic operations 10 and 11 oct by M/V ocean surveyor towing 84 meter long cable in area bound by…
  31. HYDROLANT 1640/042004-10-09 → 2004-10-10
    Oceanographic operations 10 and 11 oct by M/V ocean surveyor towing 84 meter cable in area bound by 10-38.6S…
  32. HYDROLANT 1637/042004-10-08 → 2004-10-09
    Survey operations by M/V ocean surveyor towing 84 meter long cable: a. 10 oct in area bound by 10-38.56S…
  33. HYDROLANT 1594/042004-09-30 → 2004-10-09
    Survey operations 02 thru 08 oct by M/V sirius H-21 along trackline joining 19-45S 038-15W, 20-10S 039-25W,…
  34. HYDROLANT 1429/042004-08-31 → 2004-09-28
    Survey operations in progress until 27 sep by M/V polar bjorn in area bound by 07-44.24S 011-19.14E,…
  35. HYDROLANT 1240/042004-07-24 → 2004-08-14
    Survey operations in progress until 13 aug by M/V sirius H-31 along trackline between 09-30S 034-35W, 11-15S…
  36. HYDROLANT 1077/042004-06-26 → 2004-08-25
    Underwater operations in progress until further notice by vessel saipem 10000 vicinity 05-22.8S 011-25.6E
  37. HYDROLANT 1071/042004-06-25 → 2004-07-24
    Survey operations 28 jun thru 30 jul by M/V sirius H-31 along trackline between 09-30S 034-35W, 11-15S 035-42W
  38. HYDROLANT 890/042004-05-23 → 2004-05-26
    Survey operations in progress until 260259Z may by M/V falcon explorer towing six 80 meter long cables in…
  39. HYDROLANT 889/042004-05-23 → 2004-05-26
    Survey operations in progress until 260300Z may by M/V bergen surveyor towing 6000 meter long cable in area…
  40. HYDROLANT 888/042004-05-23 → 2004-05-25
    Survey operations in progress until 250259Z may by M/V ocean explorer towing 6000 meter long cable in area…
  41. HYDROLANT 878/042004-05-22 → 2004-05-27
    Survey operations in progress until 26 may by M/V amorim do vale in area bound by 10-32.0S 036-24.0W,…
  42. HYDROLANT 859/042004-05-19 → 2004-05-29
    Survey operations in progress until 300300Z may by M/V rou 22 oyarvide in area bound by 34-30.5S 053-34.8W,…
  43. HYDROLANT 856/042004-05-19 → 2004-05-23
    Survey operations in progress until 230300Z may by M/V bergen surveyor towing 6000 meter long cable in area…
  44. HYDROLANT 855/042004-05-19 → 2004-05-23
    Survey operations in progress until 230259Z may by M/V ocean explorer towing 6000 meter long cable in area…
  45. HYDROLANT 854/042004-05-19 → 2004-05-23
    Survey operations in progress until 230259Z may by M/V falcon explorer towing six 80 meter long cables in…
  46. HYDROLANT 839/042004-05-16 → 2004-05-19
    Survey operations in progress until 190300Z may by M/V bergen surveyor towing 6000 meter long cable in area…
  47. HYDROLANT 830/042004-05-15 → 2004-05-19
    Survey operations in progress until 190259Z may by M/V falcon explorer towing six 80 meter long cables in…
  48. HYDROLANT 824/042004-05-14 → 2004-05-22
    Survey operations 17 thru 22 may by M/V amorim do vale in area bound by 10-32.0S 036-24.0W, 10-34.3S…
  49. HYDROLANT 820/042004-05-13 → 2004-05-19
    Survey operations in progress until 190259Z may by M/V ocean explorer towing 6000 meter long cable in area…
  50. HYDROLANT 818/042004-05-13 → 2004-05-16
    Survey operations in progress until 160300Z may by M/V bergen surveyor towing 6000 meter long cable in area…

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 42 · seahazards