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 3061/202020-10-08 → 2020-10-18
    Survey operations 09 thru 17 oct by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 3046/202020-10-07 → 2020-10-13
    Underwater operations 1000Z to 2000Z daily 08 thru 13 oct by M/V bunun justice and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  3. HYDROLANT 3014/202020-10-04 → 2020-12-02
    Survey operations in progress until further notice by M/V polarcus adira towing ten six mile long cables in…
    Eastern South Atlantic · Gabon · Congo
  4. HYDROLANT 2982/202020-10-01 → 2020-10-11
    Survey operations in progress until 10 oct by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 2911/202020-09-25 → 2020-10-01
    Survey operations in progress until 03 oct by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 2858/202020-09-18 → 2020-10-22
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-31.5S 015-51.4E
    Eastern South Atlantic · Namibia
  7. HYDROLANT 2847/202020-09-18 → 2020-09-27
    Survey operations in progress until 26 sep by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic
  8. HYDROLANT 2786/202020-09-12 → 2020-09-18
    Survey operations 12 thru 20 sep by M/V oceanic sirius towing 12 12000 meter cables in area bound by…
    Western South Atlantic
  9. HYDROLANT 2731/202020-09-05 → 2020-09-13
    Survey operations in progress until 12 sep by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 2653/202020-08-28 → 2020-09-06
    Survey operations 29 aug thru 05 sep by M/V oceanic sirius towing 12 12000 meter cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 2592/202020-08-22 → 2020-08-30
    Survey operations 22 thru 29 aug by M/V oceanic sirius towing 12 12000 meter cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 2531/202020-08-15 → 2020-08-23
    Survey operations 15 thru 22 aug by M/V oceanic sirius towing 12 12000 meter cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 2504/202020-08-12 → 2020-09-18
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-45.1S 016-15.1E
    Eastern South Atlantic · Namibia
  14. HYDROLANT 2498/202020-08-12 → 2020-08-12
    Underwater operations in progress until 232000Z aug by M/V silencio IV and M/V seven sun in 21-48.49S…
    Western South Atlantic · Brazil-southeast Coast
  15. HYDROLANT 2456/202020-08-07 → 2020-08-15
    Survey operations 08 thru 15 aug by M/V oceanic sirius towing 12 12000 meter cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 2429/202020-08-04 → 2020-08-30
    Underwater operations 1100Z to 2100Z daily 05 aug thru 30 aug by M/V navios altamira in 20-23.23S 040-08.92W
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 2409/202020-08-01 → 2020-08-07
    Survey operations in progress until 08 aug by M/V oceanic sirius towing 12 12000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  18. HYDROLANT 2392/202020-07-30 → 2020-08-01
    Survey operations in progress until 07 aug by M/V oceanic sirius towing 12 12000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  19. HYDROLANT 2340/202020-07-25 → 2020-07-30
    Survey operations in progress until 01 aug by M/V oceanic sirius towing 12 12000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 2339/202020-07-25 → 2020-08-30
    Underwater operations 1600Z to 2000Z daily 27 jul to 30 aug by M/V union mariner and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 2325/202020-07-23 → 2020-07-27
    Underwater operations in progress until further notice by M/V explorer in area bound by 28-52.81S…
    Eastern South Atlantic · South Africa
  22. HYDROLANT 2246/202020-07-17 → 2020-07-25
    Survey operations in progress until 25 jul by M/V oceanic sirius towing 12 12000 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  23. HYDROLANT 2244/202020-07-17 → 2020-07-23
    Survey operations in progress 0800Z to 1700Z daily until 23 jul by M/V raisa II in area bound by 03-43.71S…
    Western South Atlantic · Brazil-north Coast
  24. HYDROLANT 2183/202020-07-09 → 2020-07-17
    Survey operations in progress until 18 july by M/V geo caribbean towing ten 12000 meter long cables in areas…
    Western South Atlantic · Brazil-southeast Coast
  25. HYDROLANT 2175/202020-07-08 → 2020-08-30
    Underwater operations 1100Z to 2100Z daily 10 jul thru 30 aug M/V santa sophia in 20-23.78S 040-07.83W
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 2165/202020-07-08 → 2020-08-30
    Underwater operations 081100Z jul to 302100Z aug by M/V gerhard schulte in 22-23.18S 040-07.42W
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 2140/202020-07-05 → 2020-07-23
    Underwater operations in progress until further notice by M/V explorer in area bound by 28-54.3S 016-21.8E,…
    Eastern South Atlantic · South Africa
  28. HYDROLANT 2124/202020-07-03 → 2020-08-04
    Underwater operations 1000Z to 2000Z daily 04 jul to 04 aug by M/V kujawy in 20-19.27S 040-12.42W
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 2123/202020-07-03 → 2020-07-25
    Underwater operations 1000Z to 2000Z daily 04 jul to 04 aug by M/V kirana naree and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 2103/202020-06-30 → 2020-07-12
    Survey operations in progress until 11 jul by M/V geo caribbean towing ten 12000 meter long cables in areas…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 2050/202020-06-26 → 2020-06-30
    Survey operations in progress until 04 jul by M/V geo caribbean towing ten 12000 meter long cables in areas…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 2048/202020-06-25 → 2020-07-30
    Underwater operations 1100Z to 2100Z daily 26 jun thru 30 jul by M/V spar aries in 20-22.50S 040-07.18W
    Western South Atlantic · Brazil-southeast Coast
  33. HYDROLANT 2047/202020-06-25 → 2020-07-30
    Underwater operations 1100Z to 2100Z daily 26 jun thru 30 jul by M/V da xiang in 20-22.85S 040-07.48W
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 2021/202020-06-23 → 2020-06-26
    Survey operations in progress until 27 jun by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 2010/202020-06-20 → 2020-07-30
    Underwater operations 1100Z to 2000Z daily 21 jun thru 30 jul by M/V daphne and M/V open seas I in 20-23.48S…
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 1950/202020-06-14 → 2020-06-21
    Survey operations in progress until 20 jun by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 1877/202020-06-05 → 2020-06-14
    Survey operations in progress until 13 jun by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 1821/202020-05-30 → 2020-06-07
    Survey operations in progress until 06 jun by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 1782/202020-05-26 → 2020-06-02
    Survey operations 27 may thru 01 jun by M/V ramform titan towing 14 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 1767/202020-05-25 → 2020-05-26
    Survey operations 26 may thru 02 jun by M/V ramform titan towing 14 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 1736/202020-05-22 → 2020-05-31
    Survey operations in progress until 23 thru 30 may by M/V geo caribbean towing ten 12000 meter long cables…
    Western South Atlantic · Brazil-southeast Coast
  42. HYDROLANT 1714/202020-05-20 → 2020-05-25
    Survey operations in progress until 26 may by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 1663/202020-05-15 → 2020-05-24
    Survey operations 16 thru 23 may by M/V geo caribbean towing ten 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 1662/202020-05-15 → 2020-06-02
    Survey operations in progress until 01 jun by M/V ivan gubkin towing ten 11000 meter long cables in area…
    Western South Atlantic
  45. HYDROLANT 1596/202020-05-10 → 2020-05-20
    Survey operations in progress until 19 may by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 1568/202020-05-08 → 2020-05-15
    Survey operations in progress until 09 thru 16 may by M/V geo caribbean towing ten 12000 meter long cables…
    Western South Atlantic · Brazil-southeast Coast
  47. HYDROLANT 1466/202020-04-29 → 2020-06-30
    Underwater operations 1100Z to 2000Z daily 01 may thru 30 jun M/V tian fu in 20-23.67S 040-07.83W
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 1458/202020-04-28 → 2020-05-10
    Survey operations in progress until 12 may by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 1456/202020-04-28 → 2020-05-08
    Survey operations in progress until 09 may by M/V geo caribbean towing ten 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  50. HYDROLANT 1439/202020-04-27 → 2020-05-01
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-32.2S 015-50.3E
    Eastern South Atlantic · Namibia

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 16 · seahazards