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 1584/212021-06-13 → 2021-06-25
    Underwater operations 0900Z to 2100Z daily 13 jun thru 27 aug by M/V anchieta in 21-19.28S 040-03.68W
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 1583/212021-06-13 → 2021-06-13
    Underwater operations 130900Z jun thru 272100Z aug by M/V anchieta in 21-19.28S 040-03.68W
    Western South Atlantic · Brazil-southeast Coast
  3. HYDROLANT 1561/212021-06-11 → 2021-06-18
    Survey operations 11 thru 19 jun by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 1551/212021-06-10 → 2021-06-13
    Survey operations 110100Z to 130900Z jun by M/V almirante graca aranha H34 in area bound by 29-46.90S…
    Western South Atlantic · Brazil-south Coast
  5. HYDROLANT 1540/212021-06-08 → 2021-06-16
    Survey operations in progress until 15 jun by M/V bgp pioneer in area bound by 29-59.77S 048-01.45W,…
    Western South Atlantic · Brazil-south Coast
  6. HYDROLANT 1530/212021-06-07 → 2021-06-09
    Underwater operations in progress until 18 jun by M/V ostreiro in 25-19.47S 040-41.33W
    Western South Atlantic
  7. HYDROLANT 1511/212021-06-06 → 2021-10-10
    Survey operations in progress until 09 oct by M/V sanco sword e subsea viking in area bound by 25-43.24S…
    Western South Atlantic · Brazil-south Coast
  8. HYDROLANT 1481/212021-06-02 → 2021-06-08
    Survey operations 02 thru 07 jun by M/V hai yang shi you 720 in area bound by 26-21S 044-18W, 26-36S…
    Western South Atlantic
  9. HYDROLANT 1472/212021-05-31 → 2021-06-06
    Underwater operations 1100Z to 1900Z daily 01 thru 06 jun by M/V texas and M/V seamaster I in 05-42.08S…
    Western South Atlantic · Brazil-northeast Coast
  10. HYDROLANT 1470/212021-05-31 → 2021-07-21
    Survey operations in progress until 202359Z jul by M/V eco warrior in area bound by 23-00.52S 041-48.17W,…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 1429/212021-05-28 → 2021-06-06
    Survey operations in progress until 05 jun by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 1421/212021-05-27 → 2021-06-21
    Underwater operations in progress until further notice by M/V the explorer in area bound by 28-52S 016-14E,…
    Eastern South Atlantic · Namibia
  13. HYDROLANT 1398/212021-05-25 → 2021-06-02
    Survey operations 26 may thru 01 jun by M/V bgp pioneer in area bound by 27-07.33S 046-02.62W, 27-03.50S…
    Western South Atlantic · Brazil-south Coast
  14. HYDROLANT 1395/212021-05-24 → 2021-06-01
    Survey operations 25 thru 31 may by M/V hai yang shi you 720 in area bound by 26-36S 044-13W, 26-24S…
    Western South Atlantic
  15. HYDROLANT 1365/212021-05-20 → 2021-05-28
    Survey operations 20 thru 29 may by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 1338/212021-05-18 → 2021-05-26
    Survey operations in progress until 25 may by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  17. HYDROLANT 1331/212021-05-17 → 2021-05-25
    Survey operations 18 thru 25 may by M/V bgp pioneer in area bound by 27-07.33S 046-02.61W, 27-46.22S…
    Western South Atlantic · Brazil-south Coast
  18. HYDROLANT 1323/212021-05-16 → 2021-05-22
    Underwater operations in progress until 220300Z may in 25-40.27S 043-12.43W
    Western South Atlantic
  19. HYDROLANT 1298/212021-05-13 → 2021-05-20
    Survey operations 14 thru 22 may by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 1287/212021-05-11 → 2021-05-14
    Underwater operations in progress until 14 may by M/V joides resolution in area within two miles of…
    Western South Atlantic
  21. HYDROLANT 1251/212021-05-06 → 2021-05-13
    Survey operations 07 thru 15 may by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  22. HYDROLANT 1241/212021-05-05 → 2021-05-10
    Underwater operations in progress until 09 may by M/V joides resolution in area within two miles of…
    Western South Atlantic
  23. HYDROLANT 1234/212021-05-04 → 2021-05-27
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-17.03S…
    Eastern South Atlantic · Namibia
  24. HYDROLANT 1224/212021-05-04 → 2021-05-11
    Survey operations in progress until 10 may by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic
  25. HYDROLANT 1223/212021-05-04 → 2021-05-09
    Survey operations in progress until 08 may by M/V bgp pioneer in area bound by 27-07.33S 046-02.61W,…
    Western South Atlantic · Brazil-south Coast
  26. HYDROLANT 1209/212021-05-02 → 2021-05-04
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-37.49S…
    Eastern South Atlantic · Namibia
  27. HYDROLANT 1195/212021-04-30 → 2021-05-05
    Underwater operations in progress until 05 may by M/V joides resolution in area within two miles of…
    Western South Atlantic
  28. HYDROLANT 1157/212021-04-27 → 2021-05-04
    Survey operations in progress until 04 may by M/V bgp pioneer in area bound by 27-07.33S 046-02.62W,…
    Western South Atlantic · Brazil-south Coast
  29. HYDROLANT 1133/212021-04-23 → 2021-05-02
    Survey operations 24 apr thru 01 may by M/V oceanic sirius towing 12 11112 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 1111/212021-04-22 → 2021-04-28
    Underwater operations 22 thru 27 apr in area within two miles of 30-24.20S 016-55.36W
    South Atlantic
  31. HYDROLANT 1094/212021-04-20 → 2021-04-23
    Survey operations 20 thru 25 apr by M/V oceanic sirius towing 12 11112 meter cables in area bound by…
    Western South Atlantic · Brazil-east Coast
  32. HYDROLANT 1065/212021-04-18 → 2021-04-24
    Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by M/V olivia r in 20-21.38S 040-08.60W
    Western South Atlantic · Brazil-southeast Coast
  33. HYDROLANT 1064/212021-04-18 → 2021-04-24
    Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by M/V monegasque epee in 20-23S 040-08W
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 1063/212021-04-18 → 2021-04-24
    Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by M/V olympus in 20-22.50S 040-08.21W
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 1062/212021-04-18 → 2021-04-24
    Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by M/V leto in 20-23.05S 040-09.10W
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 1061/212021-04-18 → 2021-04-24
    Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by M/V oriana c in 20-19.23S 040-10.10W
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 1060/212021-04-18 → 2021-04-24
    Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by M/V marathassa in 20-22.67S 040-09.33W
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 1036/212021-04-16 → 2021-04-23
    Survey operations in progress until 24 apr by M/V oceanic sirius towing 12 11112 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 1033/212021-04-15 → 2021-04-15
    Underwater operations in progress until further notice by M/V mathilda gem in 28-43.04S 016-29.96E
    Eastern South Atlantic · South Africa
  40. HYDROLANT 1025/212021-04-15 → 2021-05-16
    Survey operations in progress until 152359Z may by M/V eco warrior in area bound by 24-04.34S 045-25.73W,…
    Western South Atlantic · Brazil-south Coast
  41. HYDROLANT 1005/212021-04-13 → 2021-06-21
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 26-04.3S 014-47.9E,…
    Eastern South Atlantic · Namibia
  42. HYDROLANT 1003/212021-04-13 → 2021-04-21
    Survey operations in progress until 20 apr by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  43. HYDROLANT 1002/212021-04-13 → 2021-04-20
    Survey operations in progress until 19 apr by M/V bgp pioneer towing 12000 meter long cable in area bound by…
    Western South Atlantic · Brazil-south Coast
  44. HYDROLANT 984/212021-04-10 → 2021-04-15
    Underwater operations in progress 1100Z to 2100Z daily until 15 apr by M/V western monaco in 20-20.20S…
    Western South Atlantic · Brazil-southeast Coast
  45. HYDROLANT 970/212021-04-09 → 2021-04-16
    Survey operations in progress until 17 apr by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 886/212021-03-31 → 2021-04-09
    Survey operations 02 thru 10 apr by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 868/212021-03-30 → 2021-04-30
    Underwater operations in progress until further notice by M/V the explorer in area bound by 26-07.68S…
    Eastern South Atlantic · Namibia
  48. HYDROLANT 867/212021-03-30 → 2021-05-24
    Survey operations in progress until 23 may by M/V subsea viking in area bound by 25-39.63S 044-11.97W,…
    Western South Atlantic · Brazil-south Coast
  49. HYDROLANT 865/212021-03-30 → 2021-04-07
    Survey operations in progress until 06 apr by M/V hai yang shi you 720 towing ten 11112 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  50. HYDROLANT 834/212021-03-26 → 2021-03-31
    Survey operations in progress until 03 apr by M/V oceanic sirius towing 12 11112 meter long cables in area…
    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 13 · seahazards