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 · 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 2686/182018-08-22 → 2018-10-03
    Survey operations 260001Z aug to 030001Z oct by M/V pourquoi pas towing one 3000 meter long cable in area…
    Eastern North Atlantic · South Atlantic
  2. HYDROLANT 2641/182018-08-18 → 2018-08-22
    Underwater operations in progress until further notice by M/V the explorer in 26-02.4S 014-56.3E
    Eastern South Atlantic · Namibia
  3. HYDROLANT 2624/182018-08-16 → 2018-08-31
    Underwater operations 1000Z to 2000Z daily 17 thru 31 aug by M/V cavalo de troia and M/V camorim tempestade…
    Western South Atlantic · Brazil-south Coast
  4. HYDROLANT 2555/182018-08-09 → 2018-08-14
    Underwater operations in progress until further notice by M/V explorer in 26-39.8S 015-01.9E
    Eastern South Atlantic · Namibia
  5. HYDROLANT 2524/182018-08-05 → 2018-09-07
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  6. HYDROLANT 2423/182018-07-28 → 2018-08-02
    Survey operations 29 jul thru 01 aug by M/V oceanic champion towing 12 9260 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 2422/182018-07-27 → 2018-07-30
    Survey operations in propgress until 29 jul by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  8. HYDROLANT 2403/182018-07-26 → 2018-07-27
    Survey operations 27 jul thru 04 aug by M/V oceanic champion towing 12 9260 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  9. HYDROLANT 2368/182018-07-21 → 2018-07-26
    Survey operations 21 thru 28 jul by M/V oceanic champion towing 12 9260 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 2311/182018-07-16 → 2018-07-18
    Underwater operations in progress until further notice by M/V explorer in 26-39.2S 015-01.8E
    Eastern South Atlantic · Namibia
  11. HYDROLANT 2278/182018-07-13 → 2018-07-22
    Survey operations 14 thru 21 jul by M/V oceanic champion towing 12 9260 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 2201/182018-07-06 → 2018-07-15
    Survey operations in progress until 14 jul by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 2173/182018-07-04 → 2018-07-13
    Underwater operations in progress until further notice by M/V explorer in 26-39.8S 015-01.9E
    Eastern South Atlantic · Namibia
  14. HYDROLANT 2138/182018-07-01 → 2018-07-25
    Underwater operations 1100Z to 2000Z daily 02 thru 25 jul by M/V am contrecoeur and M/V proboat in 20-18.97S…
    Western South Atlantic · Brazil-southeast Coast
  15. HYDROLANT 2136/182018-07-01 → 2018-07-20
    Underwater operations 1100Z to 2000Z daily 02 thru 20 jul by M/V nm hellenic g and M/V probat in 20-18.32S…
    Western South Atlantic · Brzil
  16. HYDROLANT 2105/182018-06-28 → 2018-07-08
    Survey operations 29 jun thru 07 jul by M/V oceanic champion towing 12 9260 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 2065/182018-06-25 → 2018-07-16
    Underwater operations 25 jun thru 15 jul by M/V nm captain vangelis l e proboat in 20-22.23S 040-11.32W
    Western South Atlantic · Brazil-southeast Coast
  18. HYDROLANT 2017/182018-06-21 → 2018-06-28
    Survey operations 22 thru 30 jun by M/V oceanic champion towing 12 9260 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  19. HYDROLANT 2006/182018-06-21 → 2018-09-25
    Underwater operations in progress until further notice by M/V ramform sovereign in area bound by 06-00.84S…
    Eastern South Atlantic
  20. HYDROLANT 1918/182018-06-15 → 2018-07-02
    Underwater operations in progress until further notice by M/V explorer in 27-03S 015-10E
    Eastern South Atlantic · Namibia
  21. HYDROLANT 1917/182018-06-15 → 2018-06-17
    Survey operations in progress until 16 jun by M/V selmar I in areas bound by: a. 03-41.77S 038-29.27W,…
    Western South Atlantic · Brazil-north Coast
  22. HYDROLANT 1899/182018-06-14 → 2018-08-05
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  23. HYDROLANT 1896/182018-06-14 → 2018-06-21
    Survey operations 15 thru 23 jun by M/V oceanic champion towing 12 9260 meter long cables in areas: a.…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 1895/182018-06-13 → 2018-06-25
    Underwater operations 1100Z to 2000Z daily 14 thru 25 jun by M/V wyatt candies in 19-32.62S 039-15.90W
    Western South Atlantic · Brazil-east Coast
  25. HYDROLANT 1788/182018-06-06 → 2018-06-07
    Survey operations 09 thru 16 jun by M/V oceanic champion towing 12 13000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 1781/182018-06-06 → 2018-06-11
    Survey operations in progress until 10 jun by M/V ramform tethys towing 16 9300 meter long cables in area…
    Western South Atlantic · Brazil-east Coast
  27. HYDROLANT 1742/182018-06-02 → 2018-06-14
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  28. HYDROLANT 1706/182018-05-31 → 2018-06-06
    Survey operations in progress until 05 jun by M/V ramform tethys towing 16 9300 meter long cables in area…
    Western South Atlantic · Brazil-northeast Coast
  29. HYDROLANT 1692/182018-05-29 → 2018-06-01
    Underwater operations in progress until further notice by M/V explorer in 26-02.79S 014-49.40E
    Eastern South Atlantic · Namibia
  30. HYDROLANT 1524/182018-05-15 → 2018-06-19
    Survey operations by M/V polarcus alima towing six 4200 meter long cables: a. 18 may thru 12 jun in area…
    Eastern South Atlantic · Congo · Angola
  31. HYDROLANT 1437/182018-05-08 → 2018-10-01
    Survey operations 09 may thru 30 sep by M/V ramform tethys towing 16 8100 meter long cables in area bound by…
    Western South Atlantic · Brazil-east Coast
  32. HYDROLANT 1409/182018-05-04 → 2018-05-07
    Survey operations in progress until further notice by M/V hai yang shi you 760 towing seven mile long cable…
    Western South Atlantic · Argentina
  33. HYDROLANT 1392/182018-05-03 → 2018-09-07
    Survey operations in progress until further notice by M/V ramform sterling towing 6000 meter long cable in…
    Eastern South Atlantic Angola
  34. HYDROLANT 1361/182018-04-30 → 2018-06-21
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 26-39.94S…
    Eastern South Atlantic · Namibia
  35. HYDROLANT 1275/182018-04-22 → 2018-06-02
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  36. HYDROLANT 1250/182018-04-20 → 2018-05-15
    Underwater operations 1100Z to 2000Z daily 21 apr thru 15 may by M/V nba monet and M/V gideao in 20-19.35S…
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 1249/182018-04-20 → 2018-05-15
    Underwater operations 1100Z to 2100Z daily 21 apr thru 15 may by M/V nm alcmene, M/V proboat and M/V alta…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 1156/182018-04-10 → 2018-05-25
    Underwater operations in progress until further notice by M/V the explorer in area bound by 29-01.79S…
    Eastern South Atlantic · South Africa
  39. HYDROLANT 1139/182018-04-09 → 2018-04-30
    Underwater operations 1100Z to 2000Z daily 10 thru 30 apr by M/V strategic endeavor and M/V gideao in…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 1138/182018-04-09 → 2018-04-30
    Underwater operations 1100Z to 2000Z daily 10 thru 30 apr by M/V cpo oceania in 20-22.15S 040-10.53W
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 1093/182018-04-03 → 2019-04-04
    Scientific mooring established in 37-02.8S 012-18.2W
    South Atlantic · Tristan Da Cunha
  42. HYDROLANT 1036/182018-03-28 → 2018-04-03
    Underwater operations in progress until further notice by M/V the explorer in areas bound by: a. 27-05.53S…
    Eastern South Atlantic · Namibia
  43. HYDROLANT 1029/182018-03-28 → 2018-04-04
    Underwater operations in progress until further notice in area bound by 45-50.8S 059-53.7W, 45-53.2S…
    Western South Atlantic
  44. HYDROLANT 1012/182018-03-26 → 2018-03-28
    Underwater operations in progress until further notice by M/V explorer in area bound by 25-59.42S…
    Eastern South Atlantic · Namibia
  45. HYDROLANT 1007/182018-03-25 → 2018-03-28
    Underwater operations in progress until further notice in area bound by 45-52S 059-36W, 45-48S 059-56W,…
    Western South Atlantic · Argentina
  46. HYDROLANT 995/182018-03-23 → 2018-03-25
    Underwater operations in progress until further notice in area bound by 45-50.8S 059-53.7W, 45-53.2S…
    Western South Atlantic
  47. HYDROLANT 941/182018-03-19 → 2018-04-13
    Survey operations in progress until 01 may by M/V ramform tethys and M/V thor modi towing 16 8100 meter long…
    Western South Atlantic · Brazil-north Coast
  48. HYDROLANT 898/182018-03-15 → 2018-04-28
    Underwater operations in progress until 03 jul by M/V cs record and M/V saga badejo in area bound by 01-53S…
    Western South Atlantic · Brazil-north Coast
  49. HYDROLANT 848/182018-03-10 → 2018-03-18
    Survey operations in progress until further notice by vessel towing equipment in area bound by 45-55S…
    Western South Atlantic
  50. HYDROLANT 841/182018-03-09 → 2018-03-10
    Survey operations in progress until further notice by vessel towing equipment in area bound by 45-55S…
    Western South Atlantic

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 25 · seahazards