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 2780/212021-11-10 → 2021-11-16
    Survey operations in progress until 15 nov by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 2761/212021-11-08 → 2021-11-10
    Survey operations 10 thru 16 nov by M/V hai yang shi you 720 in area bound by 26-44S 044-14W, 26-36S…
    Western South Atlantic
  3. HYDROLANT 2754/212021-11-08 → 2021-11-15
    Survey operations in progress until 14 nov by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 2744/212021-11-06 → 2021-11-12
    Survey operations in progress until 12 nov by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 2716/212021-11-01 → 2021-11-10
    Survey operations in progress until 09 nov by M/V sw diamond in area bound by 21-08.60S 040-06.90W,…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 2709/212021-11-01 → 2021-11-08
    Survey operations in progress until 07 nov by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 2702/212021-10-31 → 2021-11-02
    Underwater operations in progress until 022001Z nov by M/V seabiscuit and M/V open seas I in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  8. HYDROLANT 2701/212021-10-31 → 2021-10-31
    Underwater operations in progress until 022001Z nov by M/V seabiscuit and M/V open seas I in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  9. HYDROLANT 2699/212021-10-31 → 2021-11-07
    Underwater operations in progress until 072001Z nov by M/V phoenix rising, M/V port philip and M/V indigo…
    Western South Atlantic · Brazil-south Coast
  10. HYDROLANT 2661/212021-10-29 → 2021-11-06
    Survey operations in progress until 05 nov by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 2633/212021-10-26 → 2021-11-01
    Survey operations in progress until 02 nov by sw diamond in area bound by 21-08.60S 040-06.90W, 21-06.15S…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 2626/212021-10-25 → 2021-11-01
    Survey operations in progress until 31 oct by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 2613/212021-10-23 → 2021-10-26
    Underwater operations 1100Z to 2100Z daily 23 thru 26 oct in 20-50.33S 040-03.52W
    Western South Atlantic · Brazil-southeast Coast
  14. HYDROLANT 2604/212021-10-21 → 2021-10-29
    Survey operations 22 thru 29 oct by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil
  15. HYDROLANT 2563/212021-10-18 → 2021-10-25
    Survey operations in progress until 25 oct by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 2557/212021-10-17 → 2021-11-06
    Survey operations in progress until 05 nov by M/V nho cruzeiro do sul towing two 500 meter long cables in…
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 2540/212021-10-15 → 2021-10-21
    Survey operations 15 thru 22 oct by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil
  18. HYDROLANT 2519/212021-10-12 → 2021-10-16
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · Namibia
  19. HYDROLANT 2517/212021-10-12 → 2021-10-19
    Survey operations in progress until 18 oct by M/V sw diamond in area bound by 21-08.60S 040-06.90W,…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 2511/212021-10-11 → 2021-10-18
    Survey operations in progress until 17 oct by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 2499/212021-10-08 → 2021-10-15
    Survey operations 09 thru 15 oct by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  22. HYDROLANT 2464/212021-10-04 → 2021-10-17
    Survey operations in progress until further notice by M/V nho cruzeiro do sul towing two 500 meter long…
    Western South Atlantic · Brazil-south Coast
  23. HYDROLANT 2462/212021-10-04 → 2021-10-11
    Survey operations in progress until 10 oct by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 2436/212021-09-29 → 2021-10-03
    Survey operations in progress until 02 oct by M/V sw diamond in area bound by 21-08.60S 040-06.90W,…
    Western South Atlantic · Brazil-southeast Coast
  25. HYDROLANT 2416/212021-09-27 → 2021-10-04
    Survey operations in progress until 03 oct by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 2391/212021-09-23 → 2021-09-24
    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 2378/212021-09-22 → 2021-09-30
    Survey operations 221300Z to 302100Z sep in area bound by 23-39.0S 043-53.7W, 23-39.0S 043-50.4W, 23-42.0S…
    Western South Atlantic · Brazil-south Coast
  28. HYDROLANT 2377/212021-09-21 → 2021-09-27
    Survey operations in progress until 27 sep by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 2375/212021-09-21 → 2021-09-25
    Survey operations in progress until 24 sep by M/V sw diamond in area bound by 21-08.60S 040-06.90W,…
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 2373/212021-09-21 → 2021-09-21
    Survey operations in progress until 24 sep by M/V sw diamond in area bound by 21-08.60S 040-06.90W,…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 2363/212021-09-20 → 2021-09-23
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.50S 015-52.30E
    Eastern South Atlantic · Namibia
  32. HYDROLANT 2355/212021-09-18 → 2021-09-21
    Survey operations in progress until 24 sep by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  33. HYDROLANT 2342/212021-09-16 → 2021-09-17
    Underwater operations 1100Z to 2000Z daily 16 and 17 sep by tug svitzer elias d in 20-50.33S 040-03.52W
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 2333/212021-09-15 → 2021-09-20
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · Namibia
  35. HYDROLANT 2324/212021-09-14 → 2021-09-22
    Survey operations in progress until 21 sep by M/V hai yang shi you 720 in area bound by 26-25S 044-08W,…
    Western South Atlantic
  36. HYDROLANT 2323/212021-09-14 → 2021-09-19
    Survey operations in progress until 18 sep by M/V sw diamond in area bound by 21-13.98S 040-07.75W,…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 2314/212021-09-13 → 2021-09-18
    Survey operations in progress until 19 sep by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 2304/212021-09-11 → 2021-09-18
    Survey operations in progress thru 17 sep by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 2281/212021-09-07 → 2021-09-14
    Survey operations in progress until 14 sep by M/V hai yang shi you 720 in area bound by 26-26S 044-20W,…
    Wester South Atlantic
  40. HYDROLANT 2274/212021-09-06 → 2021-09-13
    Survey operations in progress until 12 sep by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 2269/212021-09-05 → 2021-09-11
    Survey operations 06 thru 10 sep by M/V sw diamond towing nine cables in area bound by 21-16.24S 040-07.95W,…
    Western South Atlantic · Brazil-southeast Coast
  42. HYDROLANT 2256/212021-09-02 → 2021-09-11
    Survey operations 04 thru 10 sep by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 2243/212021-09-01 → 2021-09-07
    Survey operations in progress until 07 sep by M/V hai yang shi you 720 in area bound by 26-24S 044-09W,…
    Western South Atlantic
  44. HYDROLANT 2242/212021-09-01 → 2021-09-04
    Survey operations in progress until 03 sep by M/V sw diamond towing nine cables in area bound by 21-14.89S…
    Western South Atlantic · Brazil-southeast Coast
  45. HYDROLANT 2241/212021-09-01 → 2021-09-06
    Survey operations in progress until 05 sep by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 2201/212021-08-27 → 2021-09-02
    Survey operations in progress until 03 sep by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 2175/212021-08-24 → 2021-09-15
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · Namibia
  48. HYDROLANT 2172/212021-08-23 → 2021-09-01
    Survey operations 24 thru 31 aug by hai yang shi you 720 in area bound by 26-22S 044-10W, 26-39S 043-55W,…
    Western Southern Atlantic
  49. HYDROLANT 2168/212021-08-23 → 2021-08-30
    Survey operations in progress until 29 aug by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 2164/212021-08-22 → 2021-09-21
    Underwater operations in progress until 202359Z sep by M/V ile douessant along trackline joining 23-18.38S…
    Western South Atlantic · Brazil-south 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 11 · seahazards