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 1932/222022-08-03 → 2022-08-30
    Underwater operations in progress until 302000Z aug in 24-12.00S 046-23.00W
    Western South Atlantic · Brazil
  2. HYDROLANT 1913/222022-08-02 → 2022-08-15
    Survey operations in progress until 15 aug by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  3. HYDROLANT 1908/222022-08-02 → 2022-08-11
    Underwater operations in progress until 10 aug by M/V kenford in area bound by 25-29.59S 048-33.14W,…
    Western South Atlantic · Brazil
  4. HYDROLANT 1901/222022-08-01 → 2022-08-10
    Survey operations 02 thru 09 aug by M/V sw diamond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  5. HYDROLANT 1897/222022-07-31 → 2022-08-07
    Survey operations 01 thru 08 aug by M/V oceanic vega towing 12 12964 meter long cables in area bound by…
    Western South Atlantic
  6. HYDROLANT 1868/222022-07-27 → 2022-08-02
    Survey operations in progress until 08 aug by M/V ramform tethys towing 12 600 meter long cables in area…
    Western South Atlantic · Brazil
  7. HYDROLANT 1852/222022-07-25 → 2022-08-01
    Underwater operations in progress until further notice by M/V joides resolution in 30-24.20S 016-55.36W
    South Atlantic
  8. HYDROLANT 1847/222022-07-25 → 2022-08-01
    Survey operations 26 jul thru 01 aug by M/V sw diamond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  9. HYDROLANT 1844/222022-07-24 → 2022-07-31
    Survey operations 25 thru 31 jul by M/V oceanic vega towing 12 12964 meter long cables in area bound by…
    Western South Atlantic
  10. HYDROLANT 1830/222022-07-22 → 2022-07-27
    Survey operations in progress until 26 jul by m/ ramform tethys towing 12 600 meter long cables in area…
    Western South Atlantic · Brazil
  11. HYDROLANT 1806/222022-07-19 → 2022-07-22
    Survey operations in progress until 21 jul by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  12. HYDROLANT 1803/222022-07-19 → 2022-07-22
    Survey operations in progress until 25 jul by m/ ramform tethys towing 12 600 meter long cables in area…
    Western South Atlantic · Brazil
  13. HYDROLANT 1770/222022-07-15 → 2022-07-30
    Underwater operations 1100Z to 2000Z daily 15 thru 30 jul by M/V nm ken colon and M/V leo mar II in…
    Western South Atlantic · Brazil
  14. HYDROLANT 1738/222022-07-09 → 2022-07-25
    Underwater operations in progress until further notice by M/V joides resolution in 30-42.00S 020-26.00W
    South Atlantic
  15. HYDROLANT 1733/222022-07-09 → 2022-08-02
    Survey operations in progress until 10 aug by M/V kenford in areas bound by: a. 25-29.68S 048-32.00W,…
    Western South Atlantic · Brazil-south Coast
  16. HYDROLANT 1710/222022-07-06 → 2022-07-09
    Underwater operations in progress until further notice by M/V joides resolution in 30-50.00S 023-32.00W
    South Atlantic
  17. HYDROLANT 1707/222022-07-05 → 2022-07-18
    Survey operations 06 thru 17 jul by M/V joides resolution in 30-42.61S 020-26.03W
    South Atlantic
  18. HYDROLANT 1671/222022-07-02 → 2022-07-06
    Underwater operations in progress until further notice by M/V joides resolution in 30-53.77S 024-50.49W
    South Atlantic
  19. HYDROLANT 1646/222022-06-28 → 2022-07-03
    Underwater operations in progress until 02 jul by M/V joides resolution in 30-53.77S 024-50.49W
    South Atlantic
  20. HYDROLANT 1636/222022-06-27 → 2022-06-30
    Underwater operations 1100Z to 2000Z daily 27 thru 30 jun by M/V great sea and M/V obrigado senhor III in…
    Western South Atlantic · Brazil
  21. HYDROLANT 1598/222022-06-22 → 2022-06-24
    Underwater operations in progress until further notice by M/V joides resolution in vicinity 30-15.60S…
    South Atlantic
  22. HYDROLANT 1585/222022-06-21 → 2022-06-30
    Underwater operations in progress until 302000Z jun by M/V fulmar in 24-57.00S 042-27.95W
    Western South Atlantic
  23. HYDROLANT 1534/222022-06-15 → 2022-06-25
    Underwater operations 151100Z to 252000Z jun by M/V port osaka and M/V big john VI in 24-09.00S 046-22.00W
    Western South Atlantic · Brazil
  24. HYDROLANT 1523/222022-06-14 → 2022-06-30
    Underwater operations 1100Z to 2000Z daily 14 thru 30 jun in 24-13.27S 046-13.52W
    Western South Atlantic · Brazil
  25. HYDROLANT 1493/222022-06-10 → 2022-06-16
    Underwater operations 1100Z to 2000Z daily 10 thru 16 jun in 24-10.00S 046-20.00W
    Western South Atlantic · Brazil
  26. HYDROLANT 1492/222022-06-10 → 2022-06-25
    Underwater operations 1000Z to 2000Z daily 10 thru 25 jun by M/V maersk kalea and M/V open seas I in…
    Western South Atlantic · Brazil
  27. HYDROLANT 1438/222022-06-02 → 2022-06-03
    Underwater operations in progress until 18 aug in area bound by 26-14.32S 048-38.34W, 26-14.28S 048-38.30W,…
    Western South Atlantic · Brazil
  28. HYDROLANT 1424/222022-05-31 → 2022-06-08
    Survey operations in progress until 07 jun by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic
  29. HYDROLANT 1348/222022-05-23 → 2022-05-24
    Underwater operations in progress until further notice by M/V joides resolution in 30-15.64S 015-02.12W
    South Atlantic
  30. HYDROLANT 1310/222022-05-19 → 2022-05-24
    Survey operations in progress until 23 may by M/V sw empress towing 14 9260 meter long cables in area bound…
    Western South Atlantic · Brazil
  31. HYDROLANT 1255/222022-05-10 → 2022-05-18
    Survey operations in progress until 17 may by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic
  32. HYDROLANT 1250/222022-05-10 → 2022-05-17
    Survey operations in progress until 16 may by M/V sw empress towing 14 9260 meter long cables in area bound…
    Western South Atlantic · Brazil
  33. HYDROLANT 1209/222022-05-04 → 2022-05-04
    Netherlands
    North Sea · Belgium · England · France
  34. HYDROLANT 1202/222022-05-03 → 2022-05-10
    Survey operations in progress until 09 may by M/V sw empress towing 14 9260 meter long cables in area bound…
    Western South Atlantic · Brazil
  35. HYDROLANT 1200/222022-05-03 → 2022-05-03
    Survey operations in progress until 09 may by M/V sw empress towing 14 9260 meter long cables in area bound…
    Western South Atlantic · Brazil
  36. HYDROLANT 1161/222022-04-28 → 2022-04-29
    Underwater operations 1100Z to 2000Z daily 27 apr thru 07 may in: a. 20-18.82S 040-12.62W
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 1160/222022-04-28 → 2022-05-09
    Underwater operations 1000Z to 2000Z daily 27 apr thru 09 may in: a. 20-18.32S 040-10.78W
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 1159/222022-04-28 → 2022-04-29
    Underwater operations 1100Z to 2100Z daily 29 apr thru 13 may in 20-18.47S 040-11.40W
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 1158/222022-04-28 → 2022-04-28
    Underwater operations 1000Z to 2000Z daily 01 thru 15 may by M/V aristidis in 20-50.45S 040-17.07W
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 1153/222022-04-27 → 2022-04-29
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · South Africa
  41. HYDROLANT 1152/222022-04-27 → 2022-05-01
    Underwater operations 1100Z to 2000Z daily 27 apr thru 01 may by M/V dorysia in 24-10S 046-17W
    Western South Atlantic · Brazil-south Coast
  42. HYDROLANT 1151/222022-04-27 → 2022-05-01
    Underwater operations 1100Z to 2000Z daily 27 apr thru 01 may by M/V southport eagle in 24-10S 046-17W
    Western South Atlantic · Brazil-south Coast
  43. HYDROLANT 1150/222022-04-27 → 2022-05-01
    Underwater operations 1100Z to 2000Z daily 27 apr thru 01 may by M/V columbia and M/V big john VI in 24-10S…
    Western South Atlantic · Brazil-south Coast
  44. HYDROLANT 1149/222022-04-27 → 2022-05-03
    Underwater operations in progress until 030300Z may by M/V sdsv sistac esperanca in 25-47.88S 043-15.75W
    Western South Atlantic
  45. HYDROLANT 1140/222022-04-26 → 2022-05-03
    Survey operations in progress until 02 may by M/V sw empress towing 14 9260 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 1098/222022-04-19 → 2022-04-27
    Survey operations in progress until 26 apr by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic
  47. HYDROLANT 1038/222022-04-12 → 2022-04-19
    Survey operations in progress until 18 apr by M/V sw empress towing 14 9260 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 1037/222022-04-12 → 2022-04-19
    Survey operations in progress until 19 apr by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic
  49. HYDROLANT 1031/222022-04-11 → 2022-04-27
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · South Africa
  50. HYDROLANT 981/222022-04-06 → 2022-04-12
    Survey operations in progress until 11 apr by M/V sw empress towing 14 9260 meter long cables in area bound…
    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 8 · seahazards