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 3866/002000-11-17 → 2000-11-28
    Oceanographic survey 19 thru 27 nov by M/V antares in area bound by 03-41S 038-30W, 05-10S 035-13W, 08-00S…
  2. HYDROLANT 3742/002000-11-07 → 2000-11-17
    Survey operations in progress until 16 nov by M/V almirante camara in area bound by 02-18S 039-21W, 03-05S…
  3. HYDROLANT 3710/002000-11-04 → 2000-11-27
    Survey operations in progress until 26 nov by M/V sonne along trackline joining 07-08N 053-15W, 09-10N…
  4. NAVAREA IV 457/002000-11-04 → 2000-11-27
    Survey operations in progress until 26 nov by M/V sonne along trackline joining 07-08N 053-15W, 09-10N…
  5. HYDROLANT 3697/002000-11-03 → 2000-11-17
    Hydrographic survey 06 thru 16 nov by M/V sirius in area bound by 27-14.5S 048-45.0W, 27-14.5S 047-00.0W,…
  6. HYDROLANT 3634/002000-10-28 → 2000-11-04
    Survey operations 29 oct thru 03 nov by M/V almirante camara in area bound by 02-06.0S 039-58.0W, 02-06.0S…
  7. HYDROLANT 3620/002000-10-26 → 2000-11-03
    Oceanographic survey in progress until 02 nov by M/V antares in area bound by 04-28S 034-15W, 02-50S…
  8. HYDROLANT 3543/002000-10-19 → 2000-10-31
    Survey operations in progress until 30 oct by M/V l'espoir towing 2500 meter long cable along trackline…
  9. HYDROLANT 3506/002000-10-15 → 2000-11-03
    Hydrographic survey 18 oct thru 02 nov by M/V sirius in area bound by 27-14.5S 048-45.0W, 27-14.5S…
  10. HYDROLANT 3469/002000-10-11 → 2000-10-22
    Oceanographic survey in progress until 21 oct by M/V antares in area bound by 05-45S 035-12W, 00-10S…
  11. HYDROLANT 3314/002000-09-27 → 2000-10-05
    Survey operations 29 sep thru 19 oct by M/V l'espoir towing 500 meter long cable along trackline joining…
  12. HYDROLANT 3289/002000-09-25 → 2000-10-08
    Oceanographic survey in progress until 07 oct by M/V antares in area bound by 13-00S 038-20W, 14-00S…
  13. HYDROLANT 3093/002000-09-06 → 2000-09-27
    Survey operations in progress until 04 oct by M/V l'espoir towing 500 meter long cable along trackline…
  14. HYDROLANT 2801/002000-08-10 → 2000-08-29
    Dangerous wreck, marked by yellow drum, in 34-34-25S 053-43-52W
  15. HYDROLANT 2747/002000-08-07 → 2000-09-01
    Survey operations in progress until 31 aug by M/V ary rongel vicinity of trackline between 02-06S 037-56W…
  16. HYDROLANT 2313/002000-06-30 → 2000-07-10
    Oceanographic survey in progress until 09 jul by M/V antares in area bound by 24-20S 046-40W, 28-00S…
  17. HYDROLANT 2213/002000-06-21 → 2000-06-30
    Oceanographic survey in progress until 01 jul by M/V antares in area bound by 24-20S 046-40W, 28-00S…
  18. HYDROLANT 2063/002000-06-08 → 2000-06-21
    Oceanographic survey in progress until 21 jun by M/V antares in area bound by 22-45S 042-50W, 27-15S…
  19. HYDROLANT 1787/002000-05-18 → 2000-06-03
    Oceanographic survey 20 may thru 02 jun by M/V antares in area bound by 21-30S 040-50W, 22-15S 034-25W,…
  20. HYDROLANT 1775/002000-05-17 → 2000-05-31
    Survey operations 18 may until further notice by M/V ara tender olivieri towing equipment in area between…
  21. HYDROLANT 2372/991999-11-06 → 1999-11-18
    Survey operations 070900Z to 180300Z nov by M/V petr kottsov along trackline joining 03-44.41S 038-27.19W,…
  22. HYDROLANT 2198/991999-10-14 → 1999-11-26
    Survey operations 18 thru 28 oct, 01 thru 11 and 15 thru 25 nov by M/V sirius in area bound by 25-40.0S…
  23. HYDROLANT 1286/991999-06-22 → 1999-07-04
    Oceanographic operations in progress until 03 jul by M/V antares in area bound by 00-20N 040-00W, 02-40S…
  24. HYDROLANT 2378/981998-12-12 → 1999-04-16
    Scientific equipment established in 32-09.3S 051-58.2W
  25. HYDROLANT 170/981998-01-26 → 1999-03-12
    Oceanographic buoy, fl, established in 00-00.7S 035-02.8W

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 46 · seahazards