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 328/222022-02-03 → 2022-02-11
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-31.3S 015-49.2E
    Eastern South Atlantic · Namibia
  2. HYDROLANT 319/222022-02-01 → 2022-02-08
    Underwater operations 1100Z to 2000Z daily 01 thru 08 feb in 24-11.00S 046-21.00W
    Western South Atlantic · Brazil-south Coast
  3. HYDROLANT 318/222022-02-01 → 2022-02-08
    Underwater operations 1100Z to 2000Z daily 01 thru 08 feb in 24-12.00S 046-21.15W
    Western South Atlantic · Brazil-south Coast
  4. HYDROLANT 317/222022-02-01 → 2022-02-04
    Underwater operations 1100Z to 2000Z daily 01 thru 04 feb in 24-12.00S 046-21.15W
    Western South Atlantic · Brazil-south Coast
  5. HYDROLANT 316/222022-02-01 → 2022-02-08
    Survey operations in progress until 07 feb by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 315/222022-01-31 → 2022-02-04
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 25-50.5S 014-43.8E,…
    Eastern South Atlantic · Namibia
  7. HYDROLANT 267/222022-01-28 → 2022-02-04
    Underwater operations 1100Z to 2000Z daily 28 jan thru 04 feb by M/V big john VI in 24-11S 046-21W
    Western South Atlantic · Brazil-south Coast
  8. HYDROLANT 266/222022-01-28 → 2022-01-28
    Brazil-south coast DNC 01
    Western South Atlantic
  9. HYDROLANT 261/222022-01-27 → 2022-03-15
    Survey operations in progress until further notice by M/V amazon conqueror towing 14 four mile long cables…
    Western South Atlantic · Angola
  10. HYDROLANT 228/222022-01-25 → 2022-02-01
    Survey operations in progress until 31 jan by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 188/222022-01-21 → 2022-02-15
    Underwater operations 1000Z to 2000Z daily 22 jan thru 15 feb by M/V sao pedro glorioso and tug multicat acu…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 169/222022-01-18 → 2022-01-19
    Survey operations in progress until 18 jan by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic
  13. HYDROLANT 149/222022-01-17 → 2022-01-21
    1.UNDERWATER operations in progress until further notice by M/V joides resolution in 25-12.16S 007-29.76E
    Eastern South Atlantic
  14. HYDROLANT 120/222022-01-13 → 2022-02-10
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-37S…
    Eastern South Atlantic · Namibia
  15. HYDROLANT 116/222022-01-13 → 2022-01-20
    Underwater operations 1100Z to 2000Z daily 13 thru 20 jan by M/V big john VI in 24-11S 046-21W
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 109/222022-01-12 → 2022-01-28
    Underwater operations 1000Z to 2000Z daily 13 thru 28 jan by M/V magic p and M/V open seas I in 24-11S 046-21W
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 108/222022-01-11 → 2022-01-19
    Survey operations in progress until 18 jan by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic
  18. HYDROLANT 102/222022-01-11 → 2022-01-18
    Survey operations in progress until 17 jan by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  19. HYDROLANT 97/222022-01-10 → 2022-01-17
    1.UNDERWATER operations in progress until further notice by M/V joides resolution in 24-35.75S 005-07.31E
    Eastern South Atlantic
  20. HYDROLANT 53/222022-01-06 → 2022-01-14
    Underwater operations in progress until 142100Z jan by M/V fpso cidade de itaguai in 25-08.39S 042-56.64W…
    Western South Atlantic
  21. HYDROLANT 52/222022-01-06 → 2022-01-15
    Survey operations in progress 07 jan thru 14 jan by M/V oceanic sirius towing 12 11112 meter long cables in…
    Western South Atlantic · Brazil-southeast Coast
  22. HYDROLANT 51/222022-01-06 → 2022-01-11
    Underwater operations in progress until 112100Z jan by M/V fpso cidade de santos in 24-18.47S 042-42.68W
    Western South Atlantic · Brazil-southeast Coast
  23. HYDROLANT 43/222022-01-05 → 2022-01-10
    Underwater operations in progress until further notice by M/V joides resolution in 21-51.9S 006-35.4E
    Eastern South Atlantic
  24. HYDROLANT 3154/212021-12-25 → 2021-12-30
    Underwater operations 1100Z to 2000Z daily 25 thru 30 dec by M/V nm elpinik and M/V big john VI in 24-11S…
    Western South Atlantic · Brazil-southeast Coast
  25. HYDROLANT 3133/212021-12-23 → 2021-12-27
    Underwater operations 1100Z to 2000Z daily 22 thru 27 dec by nm ladoga and big john VI in 24-11S 046-21W
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 3093/212021-12-17 → 2021-12-21
    Underwater operations 1100Z to 2000Z daily 16 thru 21 dec by M/V dylan in 24-12.18S 046-19.73W
    Western South Atlantic · Brazil-south Coast
  27. HYDROLANT 3085/212021-12-17 → 2021-12-25
    Survey operations in progress until 24 dec by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  28. HYDROLANT 3082/212021-12-17 → 2021-12-17
    Underwater operations 1100Z to 2000Z daily 16 thru 21 dec by M/V dylan in 24-11S 046-21W
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 3081/212021-12-17 → 2021-12-23
    Underwater operations 1100Z to 2000Z daily 16 thru 23 dec by M/V great vanguard in 24-11S 046-21W
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 3080/212021-12-17 → 2021-12-30
    Underwater operations 1100Z to 2000Z daily 16 thru 30 dec by M/V pauline in 24-07.52S 046-13.12W
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 3058/212021-12-14 → 2021-12-28
    Survey operations in progress until 27 dec by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 3040/212021-12-13 → 2021-12-14
    Survey operations in progress until 20 dec by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  33. HYDROLANT 3018/212021-12-10 → 2021-12-17
    Survey operations in progress until 17 dec by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 2986/212021-12-06 → 2021-12-14
    Survey operations in progress until 13 dec by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 2973/212021-12-03 → 2021-12-10
    Survey operations in progress until 10 dec by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 2932/212021-11-28 → 2021-12-06
    Survey operations in progress until 05 dec by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 2931/212021-11-28 → 2021-11-28
    Survey operations in progress until 05 dec by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 2907/212021-11-26 → 2022-01-25
    Underwater operations in progress until 24 jan 22 by M/V silencio VI in area bound by 21-49.82S 040-50.13W,…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 2905/212021-11-26 → 2021-12-03
    Survey operations 26 nov thru 03 dec by M/V oceanic sirius towing 12 11112 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 2881/212021-11-23 → 2021-11-30
    Survey operations in progress until 29 nov by M/V hai yang shi you 720 in area bound by 26-47S 044-17W…
    Western South Atlantic
  41. HYDROLANT 2875/212021-11-23 → 2022-01-03
    Underwater operations in progress until further notice by: a. M/V gariep in 28-39.5S 015-52.3E
    Eastern South Atlantic · Namibia
  42. HYDROLANT 2874/212021-11-23 → 2021-12-01
    Survey operations in progress until 30 nov by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 2866/212021-11-22 → 2021-11-29
    Survey operations in progress until 28 nov by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 2844/212021-11-18 → 2021-11-26
    Survey operations 19 thru 26 nov by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  45. HYDROLANT 2821/212021-11-16 → 2021-11-30
    Underwater operations 1000Z to 2000Z daily 17 thru 30 nov by M/V baltic k and M/V open seas I in 20-19.03S…
    Western South Atlantic · Brazil-southest Coast
  46. HYDROLANT 2820/212021-11-16 → 2021-11-23
    Survey operations in progress until 23 nov by M/V sw diamond towing two 225 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 2811/212021-11-15 → 2021-11-22
    Survey operations in progress until 21 nov by M/V sw empress towing 14 8334 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 2793/212021-11-12 → 2021-11-18
    Survey operations in progress until 19 nov by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 2786/212021-11-11 → 2021-11-14
    Underwater operations 1100Z to 2000Z daily 12 thru 14 nov by M/V hosanger and M/V santiago in 20-50.33S…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 2782/212021-11-10 → 2021-11-17
    Survey operations in progress until 16 nov by M/V hai yang shi you 720 in area bound by 26-48S 044-17W,…
    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 10 · seahazards