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 2161/212021-08-22 → 2021-08-28
    Survey operations 23 thru 27 aug by M/V sw diamond in area bound by 21-26.78S 040-10.60W, 21-16.67S…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 2157/212021-08-21 → 2021-09-08
    Underwater operations in progress until 07 sep along trackline joining 23-18.38S 043-29.15W, 23-19.77S…
    Western South Atlantic · Brazil-south Coast
  3. HYDROLANT 2155/212021-08-20 → 2021-08-27
    Survey operations in progress until 27 aug by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 2143/212021-08-19 → 2021-08-23
    Survey operations in progress until 22 aug by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 2110/212021-08-16 → 2021-08-21
    Survey operations in progress until 20 aug by M/V sw diamond in area bound by 21-29.30S 040-12.38W,…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 2103/212021-08-14 → 2021-08-20
    Survey operations in progress until 20 aug by M/V oceanic sirius towing 12 11112 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 2078/212021-08-10 → 2021-08-18
    Survey operations in progress until 17 aug by M/V bgp pionner in area bound by 27-46.00S 044-04.83W,…
    Western South Atlantic · Brazil-south Coast
  8. HYDROLANT 2077/212021-08-10 → 2021-08-18
    Survey operations in progress until 17 aug by M/V hai yang shi you 720 in area bound by 26-26S 044-20W,…
    Western South Atlantic
  9. HYDROLANT 2066/212021-08-09 → 2021-08-16
    Survey operations in progress until 15 aug by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 2062/212021-08-08 → 2021-08-16
    Survey operations in progress until 15 aug by M/V sw diamond in area bound by 21-08.60S 040-06.90W,…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 2048/212021-08-06 → 2021-08-14
    Survey operations in progress until 13 aug by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 2025/212021-08-04 → 2021-08-08
    Underwater operations 1100Z to 2000Z daily 04 thru 08 aug in 22-19.23S 040-18.02W
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 2017/212021-08-03 → 2021-08-11
    Survey operations in progress until 10 aug by M/V hai yang shi you 720 in area bound by 26-20S 044-10W,…
    Western South Atlantic
  14. HYDROLANT 2015/212021-08-03 → 2021-08-03
    Survey operations in progress until 10 aug by M/V hai yang shi you 720 in area bound by 26-20S 044-10W,…
    Western South Atlantic
  15. HYDROLANT 2014/212021-08-03 → 2021-08-11
    Survey operations in progress until 10 aug by M/V bgp pionner in area bound by 27-46.00S 044-04.83W,…
    Western South Atlantic · Brazil-south Coast
  16. HYDROLANT 1981/212021-07-30 → 2021-08-05
    Underwater operations 1000Z to 2100Z daily 31 jul thru 05 aug by M/V am jyoti and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 1979/212021-07-29 → 2021-08-06
    Survey operations in progress until 06 aug by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  18. HYDROLANT 1972/212021-07-29 → 2021-08-04
    Survey operations in progress until further notice by M/V ramform tethys towing 8025 meter long cable in…
    Eastern South Atlantic · Angola
  19. HYDROLANT 1970/212021-07-29 → 2021-08-08
    Survey operations in progress until 07 aug by M/V sw diamond in area bound by 21-08.60S 040-06.90W,…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 1955/212021-07-27 → 2021-08-03
    Survey operations in progress until 03 aug by M/V hai yang shi you 720 in area bound by 26-55S 044-22W,…
    Western South Atlantic
  21. HYDROLANT 1954/212021-07-27 → 2021-08-03
    Survey operations in progress until 03 aug by M/V bgp pionner in area bound by 27-46.00S 044-04.83W,…
    Western South Atlantic · Brazil-south Coast
  22. HYDROLANT 1946/212021-07-26 → 2021-07-29
    Survey operations in progress until further notice by M/V ramform tethys towing 8025 meter long cables in…
    Eastern South Atlantic · Angola
  23. HYDROLANT 1925/212021-07-23 → 2021-07-28
    Underwater operations 1100Z to 2100Z daily 23 thru 28 jul by M/V meloi in 20-23.27S 040-15.85W
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 1924/212021-07-23 → 2021-07-28
    Underwater operations 1100Z to 2100Z daily 23 thru 28 jul by M/V gf orient in 20-23.4S 040-15.4W
    Western South Atlantic · Brazil-southeast Coast
  25. HYDROLANT 1923/212021-07-23 → 2021-07-29
    Survey operations in progress until 30 jul by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 1921/212021-07-22 → 2021-07-23
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · Namibia
  27. HYDROLANT 1906/212021-07-21 → 2021-08-02
    Survey operations in progress until 01 aug by M/V sw empress towing 14 8334 meter cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  28. HYDROLANT 1897/212021-07-19 → 2021-07-30
    Underwater operations 1000Z to 2000Z daily 18 thru 30 jul by M/V ostreiro in 25-01.30S 042-40.05W
    Western South Atlantic
  29. HYDROLANT 1884/212021-07-19 → 2021-07-27
    Survey operations 20 thru 27 jul by M/V bgp pionner in area bound by 27-46.00S 044-04.83W, 27-03.43S…
    Western South Atlantic · Brazil-south Coast
  30. HYDROLANT 1883/212021-07-19 → 2021-07-24
    Survey operations 20 thru 23 jul by M/V hai yang shi you 720 in area bound by 26-25S 044-21W, 26-29S…
    Western South Atlantic
  31. HYDROLANT 1869/212021-07-16 → 2021-07-24
    Survey operations in progress until 23 jul by M/V oceanic sirius towing 11 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 1844/212021-07-13 → 2021-07-21
    Survey operations 13 thru 20 jul by M/V hai yang shi you 720 in area bound by 26-26S 044-16W, 26-44S…
    Western South Atlantic
  33. HYDROLANT 1843/212021-07-13 → 2021-07-17
    Survey operations 12 thru 16 jul by M/V sw diamond in area bound by 21-05.87S 039-55.50W, 21-07.33S…
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 1842/212021-07-13 → 2021-07-21
    Survey operations 13 thru 20 jul by M/V bgp pionner in area bound by 27-46.01S 044-04.83W, 27-03.44S…
    Western South Atlantic · Brazil-south Coast
  35. HYDROLANT 1811/212021-07-09 → 2021-07-16
    Underwater operations in 1000Z to 2000Z daily 10 thru 16 jul in 25-39.2S 042-51.6W
    Western South Atlantic
  36. HYDROLANT 1806/212021-07-09 → 2021-07-16
    Survey operations in progress until 16 jul by M/V oceanic sirius towing 11 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 1798/212021-07-08 → 2021-07-13
    Survey operations in progress until 12 jul by M/V sw diamond in area bound by 21-05.87S 039-55.50W,…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 1787/212021-07-07 → 2021-07-22
    Underwater operations in progress until further notice by M/V coral sea in 28-35.3S 015-48.9E
    Eastern South Atlantic · Namibia
  39. HYDROLANT 1771/212021-07-06 → 2021-07-14
    Survey operations in progress until 13 jul by M/V hai yang shi you 720 in area bound by 26-17S 044-06W,…
    Western South Atlantic
  40. HYDROLANT 1770/212021-07-06 → 2021-07-14
    Survey operations in progress until 13 jul by M/V bgp pionner in area bound by 31-27.87S 048-55.23W,…
    Western South Atlantic · Brazil-south Coast
  41. HYDROLANT 1734/212021-07-01 → 2021-07-26
    Survey operations in progress until further notice by M/V ramform tethys towing 8025 meter long cables in…
    Eastern South Atlantic · Angola
  42. HYDROLANT 1733/212021-07-01 → 2021-07-07
    Underwater operations in progress until further notice by M/V coral sea in 28-34.3S 015-50.6E
    Eastern South Atlantic · Namibia
  43. HYDROLANT 1726/212021-07-01 → 2021-07-09
    Survey operations in progress until 09 jul by M/V oceanic sirius towing 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 1714/212021-06-29 → 2021-07-07
    Survey operations in progress until 06 jul by M/V bgp pioneer in area bound by 27-07.33S 046-02.61W,…
    Western South Atlantic · Brazil-south Coast
  45. HYDROLANT 1666/212021-06-23 → 2021-06-27
    Survey operations in progress until 26 jun by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 1664/212021-06-22 → 2021-07-01
    Survey operations in progress until further notice by M/V ramform tethys and M/V thor freyja and M/V olga…
    Eastern South Atlantic · Angola
  47. HYDROLANT 1658/212021-06-22 → 2021-06-22
    Survey operations in progress until 28 jun by M/V hai yang shi you 720 in area bound by 26-21S 044-18W,…
    Western South Atlantic
  48. HYDROLANT 1657/212021-06-22 → 2021-06-30
    Survey operations in progress until 29 jun by M/V bgp pioneer in area bound by 27-07.33S 046-02.62W,…
    Western South Atlantic · Brazil-south Coast
  49. HYDROLANT 1627/212021-06-18 → 2021-06-23
    Survey operations in progress until 26 jun by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 1599/212021-06-14 → 2021-06-17
    Underwater operations 1100Z to 1900Z daily 15 thru 22 jun by M/V texas and M/V seamaster I in 05-42.08S…
    Western South Atlantic · Brazil-northeast 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 12 · seahazards