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 2520/192019-08-19 → 2019-08-23
    Survey operations in progress until 23 aug by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  2. HYDROLANT 2506/192019-08-16 → 2019-09-10
    Underwater operations 1100Z to 2000Z daily 17 aug thru 10 sep by M/V sbi leo in 20-17.58S 040-09.68W
    Western South Atlantic · Brazil-southeast Coast
  3. HYDROLANT 2495/192019-08-16 → 2019-08-23
    Survey operations in progress until 24 aug by M/V geo caribbean towing 12 11200 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  4. HYDROLANT 2481/192019-08-15 → 2019-08-29
    Survey operations in progress until 29 aug by M/V subsea viking in area bound by 24-45.13S 042-38.90W,…
    Western South Atlantic · Brazil-south Coast
  5. HYDROLANT 2480/192019-08-15 → 2019-08-22
    Survey operations in progress until 29 aug by M/V vantage towing six 155 meter long cables in areas bound by…
    Western South Atlantic · Brazil-south Coast
  6. HYDROLANT 2478/192019-08-14 → 2019-12-15
    Underwater operations 0900Z to 2100Z daily 15 aug thru 15 dec by M/V asso trentuno, M/V surffer 1871, M/V…
    Western South Atlantic · Brazil-north East Coast
  7. HYDROLANT 2463/192019-08-13 → 2019-08-15
    Survey operations in progress 13 thru 22 aug by M/V vantage towing six 155 meter long cables in area bound…
    Western South Atlantic
  8. HYDROLANT 2454/192019-08-12 → 2019-08-19
    Survey operations in progress until 19 aug by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic
  9. HYDROLANT 2443/192019-08-10 → 2019-08-16
    Survey operations 09 aug thru 16 aug by M/V geo caribbean towing 12 11200 meter long cables in area bound by…
    Western South Atlantic
  10. HYDROLANT 2431/192019-08-08 → 2019-08-10
    Survey operations 09 aug thru 16 aug by M/V geo caribbean towing 12 11200 meter long cables in area bound by…
    Western South Atlantic
  11. HYDROLANT 2430/192019-08-08 → 2019-09-30
    Underwater operations 1100Z to 2000Z daily 10 aug thru 30 sep by M/V seven sun, M/V zatto, and M/V comando b…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 2429/192019-08-08 → 2019-08-16
    Survey operations in progress until 15 aug by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 2420/192019-08-08 → 2019-08-08
    Survey operations in progress until 15 aug by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  14. HYDROLANT 2419/192019-08-08 → 2019-08-14
    Survey operations in progress until 13 aug by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  15. HYDROLANT 2416/192019-08-08 → 2019-08-08
    Survey operations in progress until 15 aug by M/V amazon warrior towing 12 10000 meter long cables along…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 2397/192019-08-06 → 2019-08-15
    Survey operations in progress 06 thru 15 aug by M/V subsea viking in area bound by 24-45.13S 042-38.90W,…
    Western South Atlantic · Brazil-south Coast
  17. HYDROLANT 2395/192019-08-05 → 2019-10-10
    Survey operations in progress until further notice by M/V ramform sovereign towing 5600 meter long cables in…
    Eastern South Atlantic · Angola
  18. HYDROLANT 2382/192019-08-03 → 2019-08-12
    Survey operations 04 thru 12 aug by M/V hai yang shi you 720 towing ten 12000 meter long cables in areas…
    Western South Atlantic
  19. HYDROLANT 2380/192019-08-03 → 2019-08-14
    Underwater operations 02 thru 13 aug by M/V deep blue in 23-23.90S 041-25.53W
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 2363/192019-08-02 → 2019-08-07
    Survey operations in progress until 06 aug by M/V subsea viking in area bound by 24-35.70S 042-43.87W,…
    Western South Atlantic · Brazil-south Coast
  21. HYDROLANT 2362/192019-08-02 → 2019-08-08
    Survey operations in progress until 08 aug by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  22. HYDROLANT 2361/192019-08-02 → 2019-08-08
    Survey operations in progress until 08 aug by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  23. HYDROLANT 2358/192019-08-01 → 2019-12-15
    Underwater operations 0900Z to 2100Z daily 02 aug thru 15 dec by M/V surffer 1871, M/V surffer 1930 and M/V…
    Western South Atlantic · Brazil-north East Coast
  24. HYDROLANT 2336/192019-07-30 → 2019-08-05
    Survey operations in progress until further notice by M/V ramform sovereign towing 5600 meter long cables in…
    Eastern South Atlantic · Angola
  25. HYDROLANT 2299/192019-07-27 → 2019-09-15
    Underwater operations 1100Z to 2000Z daily 28 jul thru 15 sep by M/V jubilant dream in 20-22.93S 040-09.83W
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 2298/192019-07-27 → 2019-08-31
    Underwater operations 1100Z to 2000Z daily 28 jul thru 31 aug by M/V aquitania, M/V zatto, and M/V comando b…
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 2281/192019-07-26 → 2019-08-05
    Survey operations 27 jul thru 04 aug by M/V hai yang shi you 720 towing ten 900 meter long cables in areas…
    Western South Atlantic
  28. HYDROLANT 2261/192019-07-25 → 2019-08-01
    Survey operations in progress until 31 jul by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  29. HYDROLANT 2245/192019-07-23 → 2019-08-04
    Survey operations in progress until 03 aug by M/V geo caribbean towing 12 11200 meter long cables in area…
    Western South Atlantic
  30. HYDROLANT 2242/192019-07-23 → 2019-08-01
    Survey operations in progress until 31 jul by M/V subsea viking in area bound by 24-35.70S 042-43.87W,…
    Western South Atlantic · Brazil-south Coast
  31. HYDROLANT 2222/192019-07-21 → 2019-08-31
    Underwater operations 1100Z to 2000Z daily 22 jul thru 31 aug by M/V derby, M/V zatto e and M/V commando b…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 2205/192019-07-20 → 2019-08-31
    Underwater operations 1100Z to 2000Z daily until 30 aug by M/V rana in 20-18.70S 040-09.82W
    Western South Atlantic · Brazil-southeast Coast
  33. HYDROLANT 2201/192019-07-19 → 2019-07-23
    Survey operations 18 thru 27 jul by M/V geo caribbean towing 12 11200 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 2187/192019-07-19 → 2019-07-20
    Underwater operations 1100Z to 2000Z daily 18 thru 20 jul by M/V estaleiro jurong in 20-52.07S 040-04.53W
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 2179/192019-07-18 → 2019-08-01
    Survey operations in progress until 31 jul by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  36. HYDROLANT 2178/192019-07-18 → 2019-07-19
    Survey operations in progress until 26 jul by M/V geo caribbean towing 12 11200 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 2176/192019-07-18 → 2019-07-25
    Survey operations in progress until 24 jul by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  38. HYDROLANT 2161/192019-07-17 → 2019-07-18
    Survey operations in progress until 24 jul by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  39. HYDROLANT 2160/192019-07-17 → 2019-07-23
    Survey operations in progress until 24 jul by M/V subsea viking in area bound by 24-43.98S 042-44.85W,…
    Western South Atlantic · Brazil-south Coast
  40. HYDROLANT 2095/192019-07-11 → 2019-07-18
    Survey operations in progress until 17 jul by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  41. HYDROLANT 2094/192019-07-11 → 2019-07-18
    Survey operations in progress 12 thru 20 jul by M/V geo caribbean towing 12 11200 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  42. HYDROLANT 2084/192019-07-10 → 2019-07-20
    Underwater operations 1100Z to 2000Z daily 12 jul thru 31 aug by M/V rana in 20-23.0S 040-09.2W
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 2066/192019-07-09 → 2019-07-17
    Survey operations in progress until 17 jul by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  44. HYDROLANT 2054/192019-07-07 → 2019-10-27
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 28-53.7S 016-24.8E,…
    South Atlantic · South Africa
  45. HYDROLANT 2031/192019-07-04 → 2019-07-11
    Survey operations in progress until 10 jul by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic
  46. HYDROLANT 2030/192019-07-04 → 2019-07-09
    Survey operations in progress until 09 jul by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  47. HYDROLANT 2015/192019-07-04 → 2019-07-17
    Survey operations in progress until 17 jul by M/V subsea viking in area bound by 24-37.50S 042-42.88W,…
    Western South Atlantic · Brazil-south Coast
  48. HYDROLANT 2014/192019-07-04 → 2019-07-04
    Survey operations in progress until 17 jul by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  49. HYDROLANT 1988/192019-07-01 → 2019-07-19
    Survey operation in progress until 15 dec by M/V ramform sovereign towing 3600 meter long cables in area…
    Eastern South Atlantic · Angola
  50. HYDROLANT 1979/192019-06-30 → 2019-07-16
    Underwater operations 0800Z to 2300Z daily 01 thru 15 jul by M/V sentosa, barge smitbarge 1 and M/V corenav…
    Western South Atlantic · Brazil-north 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 20 · seahazards