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
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M
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S
O
N
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Other hazards in the South Atlantic Ocean

Archive · 2,275 cancelled

  1. HYDROLANT 2498/222022-10-02 → 2022-10-04
    Survey operations in progress until 03 oct by M/V oceanic vega towing 12 12964 meter long cables in area…
    Western South Atlantic
  2. HYDROLANT 2491/222022-09-30 → 2022-10-03
    Survey operations in progress until 02 oct by M/V sw diamond towing nine 225 meter long cables along…
    Western South Atlantic
  3. HYDROLANT 2473/222022-09-29 → 2022-10-02
    Survey operations in progress until 01 oct by M/V oceanic vega towing 12 12964 meter long cables in area…
    Western South Atlantic
  4. HYDROLANT 2459/222022-09-28 → 2022-10-05
    Survey operations in progress until 11 oct by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  5. HYDROLANT 2453/222022-09-27 → 2022-09-30
    Survey operations 27 thru 29 sep by M/V sw diamond towing nine 225 meter long cables along trackline joining…
    Western South Atlantic
  6. HYDROLANT 2452/222022-09-27 → 2022-10-04
    Underwater operations 1100Z to 2000Z daily 27 sep thru 04 oct by M/V island sea in 24-11.00S 046-21.00W
    Western South Atlantic · Brazil
  7. HYDROLANT 2450/222022-09-27 → 2022-10-11
    Underwater operations 1100Z to 2100Z daily 27 sep thru 11 oct by M/V comando b and M/V zatto in: a.…
    Western South Atlantic · Brazil
  8. HYDROLANT 2449/222022-09-27 → 2022-10-01
    Underwater operations 1100Z to 2000Z daily 27 sep thru 01 oct by M/V nm ocean glsr and M/V rei alberto in…
    Western South Atlantic · Brazil
  9. HYDROLANT 2447/222022-09-26 → 2022-10-03
    Underwater operations 261300Z sep to 031700Z oct in 23-10.50S 043-57.21W
    Western South Atlantic · Brazil
  10. HYDROLANT 2432/222022-09-26 → 2022-10-04
    Survey operations in progress until 03 oct by M/V pgs apollo towing six 400 meter long cables in area bound…
    Western South Atlantic · Brazil
  11. HYDROLANT 2431/222022-09-26 → 2022-09-29
    Survey operations in progress until 28 sep by M/V oceanic vega towing 12 12964 meter long cables in area…
    Western South Atlantic
  12. HYDROLANT 2423/222022-09-25 → 2023-05-25
    Survey operations 260300Z sep to 260300Z may 23 in area within ten miles of 00-14.49S 047-23.07W
    Western South Atlantic · Brazil
  13. HYDROLANT 2422/222022-09-25 → 2022-09-26
    Survey operations in progress until 26 sep by M/V oceanic vega towing 12 12964 meter long cables in area…
    Western South Atlantic
  14. HYDROLANT 2413/222022-09-23 → 2022-09-28
    Survey operations in progress until 04 oct by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  15. HYDROLANT 2401/222022-09-23 → 2022-09-27
    Survey operations in progress until 26 sep by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  16. HYDROLANT 2381/222022-09-20 → 2022-09-23
    Survey operations in progress until 23 sep by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  17. HYDROLANT 2376/222022-09-20 → 2022-09-23
    Survey operations in progress until 22 sep by M/V oceanic vega towing 12 12964 meter long cables in area…
    Western South Atlantic
  18. HYDROLANT 2367/222022-09-19 → 2022-09-23
    Underwater operations in progress until further notice by M/V joides resolution in 30-10.00S 001-10.00E
    Eastern South Atlantic
  19. HYDROLANT 2363/222022-09-18 → 2022-09-26
    Survey operations 19 thru 26 sep by M/V pgs apollo towing six 400 meter cables in area bound by 21-46.74S…
    Western South Atlantic · Brazil
  20. HYDROLANT 2361/222022-09-18 → 2022-09-20
    Survey operations 19 thru 21 sep by M/V sw diamond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  21. HYDROLANT 2357/222022-09-17 → 2022-09-19
    Underwater operations in progress until further notice by M/V joides resolution in 30-22.11S 001-05.13E
    Eastern South Atlantic
  22. HYDROLANT 2341/222022-09-16 → 2022-09-19
    Survey operations in progress until 18 sep by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  23. HYDROLANT 2337/222022-09-15 → 2022-09-17
    Underwater operations in progress until further notice by M/V joides resolution in 31-20.00S 002-50.00E
    Eastern South Atlantic
  24. HYDROLANT 2304/222022-09-13 → 2022-09-23
    Survey operations in progress until 27 sep by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  25. HYDROLANT 2303/222022-09-13 → 2022-09-16
    Survey operations in progress until 15 sep by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  26. HYDROLANT 2293/222022-09-12 → 2022-09-27
    Underwater operations 1000Z to 2000Z daily 12 thru 27 sep by M/V ton hill II and M/V open seas I in…
    Western South Atlantic · Brazil
  27. HYDROLANT 2290/222022-09-11 → 2022-09-13
    Survey operations 12 and 13 sep by M/V sw diamond towing nine 225 meter cables in area bound by 25-35.87S…
    Western South Atlantic
  28. HYDROLANT 2284/222022-09-11 → 2022-10-12
    Underwater operations 1000Z to 2000Z daily 12 sep thru 12 oct by M/V silencio IV in: a. 21-50.27S 040-47.80W
    Western South Atlantic · Brazil
  29. HYDROLANT 2283/222022-09-11 → 2022-09-20
    Survey operations 12 thru 19 sep by M/V oceanic vega towing 12 12964 meter long cables in area bound by…
    Western South Atlantic
  30. HYDROLANT 2265/222022-09-08 → 2022-09-13
    Survey operations 09 thru 12 sep by M/V sw diamond towing nine 225 meter cables in area bound by 25-23.25S…
    Western South Atlantic
  31. HYDROLANT 2252/222022-09-07 → 2022-10-04
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-07.60S…
    Eastern South Atlantic · Namibia
  32. HYDROLANT 2240/222022-09-07 → 2022-09-13
    Survey operations in progress until 20 sep by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  33. HYDROLANT 2227/222022-09-05 → 2022-09-10
    Survey operations 06 thru 09 sep by M/V sw diamond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  34. HYDROLANT 2220/222022-09-05 → 2023-03-06
    Underwater operations 0800Z to 2100Z daily 05 sep thru 05 mar 23 by M/V paracuru in 04-52.42S 036-22.45W
    Western South Atlantic · Brazil
  35. HYDROLANT 2219/222022-09-05 → 2022-09-07
    Survey operations in progress until 12 sep by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  36. HYDROLANT 2218/222022-09-05 → 2022-09-07
    Survey operations in progress until 06 sep by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  37. HYDROLANT 2187/222022-09-02 → 2022-10-01
    Survey operations in progress until 011500Z oct by tug poderoso in vicinity of trackline joining 19-50.82S…
    Western South Atlantic · Brazil
  38. HYDROLANT 2185/222022-09-02 → 2022-09-05
    Survey operations in progress until 05 sep by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  39. HYDROLANT 2155/222022-08-31 → 2022-09-02
    Survey operations in progress until 02 sep by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  40. HYDROLANT 2131/222022-08-28 → 2022-09-06
    Survey operations 29 aug thru 05 sep by M/V oceanic vega towing 12 12964 meter long cables in area bound by…
    Western South Atlantic
  41. HYDROLANT 2106/222022-08-26 → 2022-08-31
    Underwater operations 1100Z to 2000Z daily 26 thru 31 aug by M/V S2 tractor in 24-13.23S 046-20.00W
    Western South Atlantic · Brazil
  42. HYDROLANT 2083/222022-08-23 → 2022-08-31
    Survey operations in progress until 30 aug by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  43. HYDROLANT 2073/222022-08-21 → 2022-08-29
    Survey operations 22 thru 28 aug by M/V oceanic vega towing 12 12964 meter long cables in area bound by…
    Western South Atlantic
  44. HYDROLANT 2042/222022-08-16 → 2022-08-30
    Survey operations in progress until 29 aug by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  45. HYDROLANT 2032/222022-08-16 → 2022-08-24
    Survey operations in progress until 23 aug by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  46. HYDROLANT 2025/222022-08-15 → 2022-08-21
    Survey operations in progress until 22 aug by M/V oceanic vega towing 12 12964 meter long cables in area…
    Western South Atlantic · Brazil
  47. HYDROLANT 2024/222022-08-15 → 2022-08-16
    Survey operations in progress until 22 aug by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  48. HYDROLANT 2009/222022-08-13 → 2022-08-20
    Underwater operations 1100Z to 2000Z daily 13 thru 20 aug by M/V big john VI and M/V r neto I in 24-11.00S…
    Western South Atlantic · Brazil
  49. HYDROLANT 2008/222022-08-13 → 2022-08-30
    Underwater operations 1100Z to 2000Z daily 13 thru 30 aug by M/V koushun in 24-11.00S 046-23.00W
    Western South Atlantic · Brazil
  50. HYDROLANT 1962/222022-08-07 → 2022-08-15
    Survey operations 08 thru 15 aug by M/V oceanic vega towing 12 12964 meter long cables in area bound by…
    Western South Atlantic

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 7 · seahazards