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 · 268 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 · 177 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 · 67 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 3301/012001-12-31 → 2002-01-03
    Geophysical survey in progress until further notice by M/V thales venturer towing 6000 meter long cable…
  2. HYDROLANT 3282/012001-12-28 → 2001-12-31
    Geophysical survey in progress until further notice by M/V thales venturer towing 6000 meter long cable…
  3. HYDROLANT 3276/012001-12-26 → 2001-12-28
    Geophysical survey in progress until further notice by M/V thales venturer towing 6000 meter long cable…
  4. HYDROLANT 3263/012001-12-24 → 2001-12-26
    Geophysical survey in progress until further notice by M/V thales venturer towing 6000 meter long cable…
  5. HYDROLANT 3252/012001-12-22 → 2001-12-24
    Geophysical survey in progress until further notice by M/V thales venturer towing 6000 meter long cable…
  6. HYDROLANT 3229/012001-12-20 → 2001-12-22
    Geophysical survey in progress until 28 feb by M/V thales venturer towing 6000 meter long cable in area…
  7. HYDROLANT 3175/012001-12-14 → 2001-12-20
    Geophysical survey in progress until 28 feb by M/V thales venturer towing 6000 meter long cable in area…
  8. HYDROLANT 3004/012001-11-24 → 2001-12-06
    Survey operations in progress until 05 dec by M/V antares in area bound by 16-50S 039-00W, 16-50S 035-10W,…
  9. HYDROLANT 2919/012001-11-13 → 2001-11-24
    Survey operations in progress until 23 nov by M/V antares in area bound by 12-15S 037-40W, 13-00S 035-00W,…
  10. HYDROLANT 2910/012001-11-12 → 2001-12-08
    Survey operations 13 nov thru 07 dec by M/V almirante camara in area bound by 04-39S 035-35W, 04-42S…
  11. HYDROLANT 2773/012001-10-27 → 2001-11-09
    Oceanographic operations 29 oct thru 08 nov by M/V antares in area bound by 15-50S 037-50W, 13-00S 038-20W,…
  12. HYDROLANT 2411/012001-09-05 → 2001-09-15
    Oceanographic operations in progress until 14 sep by M/V antares in area bound by 01-35S 043-40W, 02-10S…
  13. HYDROLANT 2402/012001-09-04 → 2001-09-05
    Oceanographic operations in progress until 12 sep by M/V antares in area bound by 01-35S 043-40W, 02-10S…
  14. HYDROLANT 2092/012001-07-26 → 2001-07-26
    Underwater operations in progress until 261800Z jul by M/V lingue towing 1250 meter long cable in area…
  15. HYDROLANT 2067/012001-07-24 → 2001-07-25
    Underwater operations in progress until 250300Z jul by M/V lingue towing 1250 meter long cable along…
  16. HYDROLANT 2010/012001-07-17 → 2001-07-20
    Underwater operations in progress until 19 jul by M/V lingue towing 1250 meter long cable vicinity of…
  17. HYDROLANT 1939/012001-07-10 → 2001-07-21
    Oceanographic operations in progress until 20 jul by M/V antares in area bound by 02-40S 042-00W, 01-00S…
  18. HYDROLANT 1453/012001-05-19 → 2001-05-21
    Underwater operations in progress until 211200Z may by M/V skandi hav along trackline joining 03-40.0S…
  19. HYDROLANT 1409/012001-05-15 → 2001-05-19
    Underwater operations in progress until 190001Z may by M/V skandi hav in area bound by 03-24S 038-00W,…
  20. HYDROLANT 1359/012001-05-10 → 2001-05-12
    Underwater operations in progress until 120001Z may by M/V skandi hav in area bound by 03-24S 038-06W,…
  21. HYDROLANT 1301/012001-05-03 → 2001-05-05
    Underwater operations in progress until 050001Z may by M/V skandi hav in area bound by 03-24S 038-06W,…
  22. HYDROLANT 1243/012001-04-24 → 2001-04-27
    Underwater operations in progress until 271200Z apr by M/V skandi hav in area bound by 05-24S 034-57W,…
  23. HYDROLANT 1216/012001-04-22 → 2001-04-24
    Underwater operations in progress until 250001Z apr by M/V skandi hav in 05-24S 034-57W
  24. HYDROLANT 1183/012001-04-17 → 2001-04-22
    Underwater operations in progress until 21 apr by M/V skandi hav in area bound by 03-25S 038-06W, 03-41S…
  25. HYDROLANT 1179/012001-04-17 → 2001-04-27
    Survey operations in progress until 03 may by M/V almirante camara in area bound by 07-17.50S 034-43.28W,…
  26. HYDROLANT 1102/012001-04-09 → 2001-04-17
    Survey operations in progress until 26 apr by M/V l'espoir along trackline joining 32-12S 051-58W, 31-53S…
  27. HYDROLANT 1092/012001-04-07 → 2001-04-10
    Underwater operations in progress until 100001Z apr by M/V skandi hav vicinity of trackline between…
  28. HYDROLANT 1083/012001-04-06 → 2001-04-07
    Underwater operations in progress until 070001Z apr by M/V skandi hav vicinity of trackline between 03-24.2S…
  29. HYDROLANT 1000/012001-03-28 → 2001-04-01
    Underwater operations in progress until 31 mar by M/V skandi hav vicinity of trackline between 03-24.2S…
  30. HYDROLANT 898/012001-03-19 → 2001-03-21
    Underwater operations in progress until 202300Z mar by M/V skandi hav along trackline between 05-26.0S…
  31. HYDROLANT 875/012001-03-16 → 2001-03-19
    Underwater operations in progress until 182300Z mar by M/V skandi hav along trackline between 05-26.0S…
  32. HYDROLANT 873/012001-03-16 → 2001-04-05
    Hydrographic survey in progress until further notice by M/V rou 22 oyarvide within five miles of 34-09S…
  33. HYDROLANT 824/012001-03-12 → 2001-03-15
    Underwater operations in progress until 152000Z mar by M/V skandi hav in area bound by 03-42.6S 038-23.5W,…
  34. HYDROLANT 785/012001-03-08 → 2001-03-12
    Underwater operations 09 thru 11 mar by M/V skandi hav in area bound by 03-41.2S 038-16.5W, 03-41.3S…
  35. HYDROLANT 755/012001-03-06 → 2001-03-08
    Underwater operations 061200Z to 080001Z mar by M/V skandi hav in area bound by 03-26.5S 038-03.1W, 03-24.1S…
  36. HYDROLANT 745/012001-03-05 → 2001-03-11
    Underwater operations in progress until 10 mar by M/V osa vigilant towing submersible vicinity of trackline…
  37. HYDROLANT 719/012001-03-03 → 2001-03-06
    Underwater operations in progress until 060001Z mar by M/V skandi hav in area bound by 03-26.5S 038-03.1W,…
  38. HYDROLANT 699/012001-03-01 → 2001-03-03
    Underwater operations in progress until 02 mar by M/V skandi hav in area bound by 03-40.0S 038-18.0W,…
  39. HYDROLANT 698/012001-03-01 → 2001-03-04
    Underwater operations in progress until 03 mar by M/V osa vigilant towing submersible vicinity of trackline…
  40. HYDROLANT 216/012001-01-18 → 2001-01-21
    Underwater operations in progress until 20 jan by M/V osa vigilant towing 1000 meter long cable vicinity of…
  41. HYDROLANT 184/012001-01-17 → 2001-01-28
    Survey operations 171000Z to 272359Z jan by M/V l'espoir towing 2500 meter long cable along trackline…
  42. HYDROLANT 87/012001-01-09 → 2001-01-12
    Survey operations 091100Z to 121400Z jan by M/V l'espoir towing 2500 meter long cable along trackline…
  43. HYDROLANT 27/012001-01-04 → 2001-01-07
    Underwater operations in progress until 06 jan by M/V osa vigilant towing submersible along trackline…
  44. HYDROLANT 4279/002000-12-30 → 2001-01-09
    Survey operations in progress until 162300Z jan by M/V l'espoir towing 2500 meter long cable along trackline…
  45. HYDROLANT 4243/002000-12-27 → 2000-12-30
    Survey operations 271300Z to 301000Z dec by M/V l'espoir towing 2500 meter long cable along trackline…
  46. HYDROLANT 4012/002000-12-02 → 2000-12-15
    Hydrographic survey 04 thru 14 dec by M/V sirius in area bound by 27-14.5S 048-45.0W, 27-14.5S 047-00.0W,…
  47. HYDROLANT 3992/002000-12-01 → 2000-12-05
    Oceanographic operations in progress until 04 dec by M/V almirante camara in area bound by 04-40.6N…
  48. HYDROLANT 3991/002000-12-01 → 2000-12-07
    Oceanographic survey in progress until 06 dec by M/V antares in area bound by 08-00S 034-40W, 08-00S…
  49. HYDROLANT 3906/002000-11-22 → 2000-11-25
    Survey operations in progress until 24 nov by M/V almirante camara in area bound by 03-03.7S 038-18.5W,…
  50. HYDROLANT 3867/002000-11-17 → 2000-12-01
    Hydrographic survey 20 thru 30 nov by M/V sirius in area bound by 27-14.5S 048-45.0W, 27-14.5S 047-00.0W,…

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 45 · seahazards