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 174/212021-01-19 → 2021-01-23
    Survey operations in progress until 22 jan by M/V hai yang shi you 720 towing ten 12000 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  2. HYDROLANT 172/212021-01-18 → 2021-05-05
    Survey operations in progress until further notice by M/V ramform atlas towing ten 10200 meter long cables,…
    Eastern South Atlantic · Angola
  3. HYDROLANT 144/212021-01-15 → 2021-03-30
    Survey operations 14 jan thru 01 apr by M/V subsea viking in area bound by 25-39.63S 044-11.97W, 25-08.79S…
    Western South Atlantic
  4. HYDROLANT 143/212021-01-15 → 2021-01-22
    Survey operations 15 thru 23 jan by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 120/212021-01-12 → 2021-01-19
    Survey operations in progress 12 thru 21 jan by M/V polarcus naila towing 12 7000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  6. HYDROLANT 119/212021-01-12 → 2021-01-20
    Survey operations in progress 12 thru 21 jan by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 103/212021-01-12 → 2021-01-19
    Survey operations in progress until 18 jan by M/V hai yang shi you 720 towing ten 11500 meter long cables in…
    Western South Atlantic · Brazil-east Coast
  8. HYDROLANT 67/212021-01-09 → 2021-01-17
    Survey operations 09 thru 16 jan by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  9. HYDROLANT 35/212021-01-06 → 2021-01-12
    Survey operations in progress until 13 jan by M/V polarcus naila towing 12 7000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 34/212021-01-05 → 2021-01-12
    Survey operations in progress until 13 jan by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 1/212021-01-01 → 2021-01-10
    Survey operations 01 thru 09 jan by M/V oceanic sirius towing 12 11112 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 3917/202020-12-19 → 2021-01-30
    Survey operations in progress thru 31 mar 21 by M/V polarcus adira, M/V oceanic champion and M/V ocean duke…
    Eastern South Atlantic · Gabon
  13. HYDROLANT 3905/202020-12-17 → 2020-12-27
    Survey operations 18 thru 26 dec by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  14. HYDROLANT 3897/202020-12-17 → 2020-12-24
    Survey operations in progress until 23 dec by M/V polarcus nalia towing 12 6500 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  15. HYDROLANT 3895/202020-12-16 → 2020-12-18
    Survey operations in progress until 23 dec by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 3832/202020-12-11 → 2021-01-05
    Survey operations in progress until 29 jan 21 by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 3826/202020-12-10 → 2020-12-17
    Survey operations 11 thru 19 dec by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  18. HYDROLANT 3813/202020-12-09 → 2020-12-16
    Survey operations in progress until 15 dec by M/V polarcus naila towing 12 6500 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  19. HYDROLANT 3812/202020-12-09 → 2020-12-11
    Survey operations in progress until 18 dec by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  20. HYDROLANT 3774/202020-12-04 → 2020-12-09
    Survey operations in progress until 09 dec by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 3773/202020-12-04 → 2020-12-11
    Survey operations in progress until 12 dec by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  22. HYDROLANT 3759/202020-12-02 → 2020-12-19
    Survey operations 04 dec thru 31 mar 21 by M/V polarcus adira towing ten six mile long cables in area bound…
    Eastern South Atlantic · Gabon
  23. HYDROLANT 3753/202020-12-02 → 2021-03-05
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 28-52.6S 016-14.1E,…
    Eastern South Atlantic · South Africa
  24. HYDROLANT 3715/202020-11-28 → 2020-12-04
    Survey operations in progress until 28 jan 21 by M/V ramform titan towing 14 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  25. HYDROLANT 3708/202020-11-28 → 2020-12-04
    Survey operations in progress until 05 dec by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 3675/202020-11-26 → 2020-12-09
    Survey operations 24 nov thru 08 dec by M/V polarcus naila towing 12 6500 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 3650/202020-11-24 → 2020-11-28
    Survey operations in progress until 27 nov by M/V ramform titan towing 14 10000 meter cables in area bound…
    Western South Atlantic · Brazil
  28. HYDROLANT 3638/202020-11-23 → 2020-11-26
    Survey operations 24 nov thru 01 dec by M/V polarcus naila towing 12 6500 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 3602/202020-11-20 → 2020-11-29
    Survey operations in progress until 28 nov by M/V oceanic sirius towing 12 12000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  30. HYDROLANT 3558/202020-11-16 → 2020-11-25
    Survey operations in progress 17 thru 24 nov by M/V polarcus naila towing 12 7000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 3521/202020-11-12 → 2020-11-20
    Survey operations 13 thru 21 nov by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  32. HYDROLANT 3487/202020-11-10 → 2020-11-16
    Underwater operations 1000Z to 2000Z daily 11 thru 16 nov by M/V star kamila and M/V open seas I in…
    Western South Atlantic · Brazil-southeast Coast
  33. HYDROLANT 3486/202020-11-10 → 2020-11-14
    Underwater operations 1100Z to 2100Z daily 11 thru 14 nov by M/V agia irini in 20-22.43S 040-13.65W
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 3485/202020-11-10 → 2020-11-10
    Underwater operations 1000Z to 2000Z daily 11 thru 16 nov by M/V kamila and M/V open seas I in 20-22.43S…
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 3484/202020-11-10 → 2020-11-14
    Underwater operations in progress 1100Z to 2100Z daily until 14 nov by M/V acra in 20-24.05S 040-11.72W
    Western South Atlantic · Brazil-southeast Coast
  36. HYDROLANT 3483/202020-11-10 → 2020-11-14
    Underwater operations in progress 1100Z to 2100Z daily until 14 nov by M/V ronadi in 20-22.43S 040-13.65W
    Western South Atlantic · Brazil-southeast Coast
  37. HYDROLANT 3473/202020-11-10 → 2020-11-18
    Survey operations in progress until 17 nov by M/V polarcus naila towing 12 7000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 3462/202020-11-09 → 2020-11-25
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 28-52.6S 016-14.1E,…
    Eastern South Atlantic · South Africa
  39. HYDROLANT 3449/202020-11-07 → 2020-11-12
    Survey operations 08 thru 14 nov by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 3373/202020-11-03 → 2020-11-10
    Survey operations in progress until 10 nov by M/V polarcus naila towing 12 7000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 3320/202020-10-30 → 2020-10-30
    Underwater operations 1000Z to 2200Z daily 30 oct to 02 nov by M/V hydros IV in area bound by 22-59.07S…
    Western South Atlantic
  42. HYDROLANT 3282/202020-10-27 → 2020-11-08
    Survey operations 28 oct thru 07 nov by M/V oceanic sirius towing 12 12000 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 3216/202020-10-22 → 2020-10-27
    Survey operations 23 thru 31 oct by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  44. HYDROLANT 3202/202020-10-22 → 2020-11-28
    Underwater operations in progress until further notice by: a. M/V coral sea in 28-32.2S 015-50.2E
    Eastern South Atlantic · Namibia
  45. HYDROLANT 3196/202020-10-21 → 2020-11-03
    Survey operations 22 oct thru 03 nov by M/V polarcus naila towing 12 7000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 3148/202020-10-16 → 2020-10-21
    Underwater operations 0500Z to 1600Z daily until 21 oct by M/V xin hong, vessel luma d, and vessel vitor I…
    Western South Atlantic · Brazil-east Coast
  47. HYDROLANT 3126/202020-10-15 → 2020-10-22
    Survey operations 16 thru 24 oct by M/V oceanic sirius towing 12 12000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  48. HYDROLANT 3109/202020-10-13 → 2020-11-17
    Survey operations in progress until further notice by M/V ramform atlas towing 14 4500 meter long cables in…
    Eastern South Atlantic · Angola
  49. HYDROLANT 3082/202020-10-10 → 2020-11-06
    Underwater operations in progress until further notice by M/V ya toivo in area bound by 28-41.08S…
    Eastern South Atlantic · South Africa · Namibia
  50. HYDROLANT 3081/202020-10-10 → 2020-10-13
    Survey operations until further notice by M/V ramform atlas towing 14 4500 meter long cables in area bound…
    Eastern 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 15 · seahazards