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 3535/192019-11-18 → 2019-11-23
    Survey operations in progress 13 nov to 22 nov by M/V geo caribbean towing 12 ten meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  2. HYDROLANT 3414/192019-11-06 → 2019-11-21
    Underwater operations in progress until further notice by M/V the explorer in area bound by 25-54.8S…
    Eastern South Atlantic · Namibia
  3. HYDROLANT 3389/192019-11-04 → 2019-11-24
    Underwater operations in progress until further by M/V ya toivo in area bound by 26-25.64S 014-56.04E,…
    Eastern South Atlantic · Namibia
  4. HYDROLANT 3385/192019-11-04 → 2019-11-10
    Survey operations in progress until 09 nov by M/V geo caribbean towing 12 10400 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  5. HYDROLANT 3368/192019-11-01 → 2020-04-14
    Survey operations in progress until further notice by M/V sanco swift in area bound by 17-15.2S 011-26.0E,…
    Eastern South Atlantic · Namibia
  6. HYDROLANT 3346/192019-11-01 → 2019-11-04
    Survey operations in progress until 04 nov by M/V geo caribbean towing 12 10400 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  7. HYDROLANT 3328/192019-10-30 → 2019-11-01
    Survey operations in progress until 02 nov by M/V geo caribbean towing 12 10400 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  8. HYDROLANT 3254/192019-10-24 → 2019-11-01
    Survey operations in progress until 31 oct by M/V subsea viking in area bound by 24-43.02S 042-40.27W,…
    Western South Atlantic · Brazil-south Coast
  9. HYDROLANT 3253/192019-10-24 → 2019-11-01
    Survey operations 23 thru 31 oct by M/V amazon warrior towing 12 10000 meter long cables in area bound by…
    Western South Atlantic
  10. HYDROLANT 3210/192019-10-19 → 2019-10-30
    Underwater operations 1100Z to 2000Z daily 20 thru 30 oct by M/V nm federal skye and M/V santa cruz in…
    Western South Atlantic · Brazil-southeast Coast
  11. HYDROLANT 3180/192019-10-17 → 2019-10-27
    Survey operations 18 to 26 oct by M/V geo caribbean towing 12 10400 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 3179/192019-10-17 → 2019-10-24
    Survey operations 18 thru 23 oct by M/V amazon warrior towing 12 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  13. HYDROLANT 3169/192019-10-17 → 2019-10-24
    Survey operations in progress until 23 oct by M/V subsea viking in area bound by 24-43.02S 042-40.27W,…
    Western South Atlantic · Brazil-south Coast
  14. HYDROLANT 3143/192019-10-15 → 2020-01-10
    Survey operations in progress until further notice by M/V ramform sovereign towing 6000 meter long cables in…
    Eastern South Atlantic · Angola
  15. HYDROLANT 3109/192019-10-12 → 2019-10-17
    Survey operations in progress until 18 oct by M/V geo caribbean towing 12 10400 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  16. HYDROLANT 3108/192019-10-12 → 2019-10-19
    Survey operations 11 to 18 oct by M/V amazon warrior towing 12 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  17. HYDROLANT 3107/192019-10-11 → 2020-01-10
    Underwater operations in progress until further notice by M/V explorer in area bound by 26-26.8S 014-56.5E,…
    Eastern South Atlantic · Namibia
  18. HYDROLANT 3076/192019-10-10 → 2019-10-18
    Survey operations in progress until 17 oct by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  19. HYDROLANT 3060/192019-10-08 → 2019-10-17
    Survey operations 09 oct thru 16 oct by M/V subsea viking in area bound by 24-40.12S 042-41.77W, 24-52.82S…
    Western South Atlantic · Brazil-south Coast
  20. HYDROLANT 3024/192019-10-04 → 2019-10-12
    Survey operations in progress until 12 oct by M/V geo caribbean towing 12 10400 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  21. HYDROLANT 3016/192019-10-03 → 2019-10-12
    Survey operations 04 to 11 oct by M/V amazon warrior towing 12 10000 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  22. HYDROLANT 3000/192019-10-02 → 2019-10-04
    Survey operations in progress until 05 oct by M/V geo caribbean towing 12 10400 meter cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  23. HYDROLANT 2940/192019-09-26 → 2019-10-02
    Survey operations 28 sep thru 05 oct by M/V geo caribbean towing 12 10400 meter cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 2929/192019-09-25 → 2019-10-08
    Survey operations 26 sep thru 09 oct by M/V subsea viking in area bound by 24-40.12S 042-41.77W, 24-52.82S…
    Western South Atlantic · Brazil-south Coast
  25. HYDROLANT 2928/192019-09-25 → 2019-10-05
    Survey operations 26 sep thru 04 oct by M/V amazon warrior towing 12 10000 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  26. HYDROLANT 2927/192019-09-25 → 2019-10-10
    Survey operations in progress until 09 oct by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  27. HYDROLANT 2876/192019-09-20 → 2019-09-29
    Survey operations in progress until 28 sep by M/V geo caribbean towing 12 11200 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  28. HYDROLANT 2868/192019-09-19 → 2019-09-25
    Survey operations in progress until 26 sep by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 2864/192019-09-19 → 2019-09-25
    Survey operations in progress until 26 sep by M/V subsea viking in area bound by 24-45.13S 042-38.90W,…
    Western South Atlantic · Brazil-south Coast
  30. HYDROLANT 2863/192019-09-19 → 2019-09-25
    Survey operations in progress until 26 sep by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  31. HYDROLANT 2853/192019-09-18 → 2019-10-10
    Underwater operations in progress until further notice by M/V the explorer in area bound by 25-56.9S…
    Eastern South Atlantic · Namibia
  32. HYDROLANT 2846/192019-09-17 → 2019-10-22
    Survey operations in progress until further notice by M/V nordic explorer towing ten mile long cable in area…
    Eastern South Atlantic · Namibia
  33. HYDROLANT 2810/192019-09-15 → 2019-09-16
    Underwater operations 160700Z to 161500Z sep by tug mar de espanha, M/V macau, M/V grauna and M/V nb…
    Western South Atlantic · Brazil-northeast Coast
  34. HYDROLANT 2790/192019-09-13 → 2019-09-20
    Survey operations in progress until 20 sep by M/V geo caribbean towing 12 11200 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 2784/192019-09-12 → 2019-09-19
    Survey operations in progress until 19 sep by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  36. HYDROLANT 2750/192019-09-10 → 2019-09-19
    Survey operations in progress until 19 sep by M/V subsea viking in area bound by 24-45.13S 042-38.90W,…
    Western South Atlantic · Brazil-south Coast
  37. HYDROLANT 2721/192019-09-05 → 2019-09-13
    Survey operations 06 thru 13 sep by M/V geo caribbean towing 12 11200 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 2716/192019-09-05 → 2019-09-13
    Survey operations in progress until 12 sep by M/V amazon warrior towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 2715/192019-09-05 → 2019-09-13
    Survey operations in progress until 12 sep by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  40. HYDROLANT 2702/192019-09-04 → 2019-09-05
    Underwater operations 051100Z to 052000Z sep by M/V monty orr tide in area bound by 21-53.72S 040-55.90W,…
    Western South Atlantic · Brazil-southeast Coast
  41. HYDROLANT 2675/192019-09-02 → 2019-09-10
    Survey operations in progress until 12 sep by M/V subsea viking in area bound by 24-35.37S 042-43.87W,…
    Western South Atlantic · Brazil-south Coast
  42. HYDROLANT 2666/192019-08-31 → 2019-09-29
    Survey operations 2100Z to 0300Z commencing daily 30 aug thru 28 sep by M/V baru atria, M/V locar lh XXI,…
    Western South Atlantic · Brazil-southeast Coast
  43. HYDROLANT 2664/192019-08-30 → 2019-09-10
    Survey operations 01 thru 09 sep by M/V hai yang shi you 720 in area bound by 26-36S 043-25W, 27-13S…
    Western South Atlantic
  44. HYDROLANT 2663/192019-08-30 → 2019-09-05
    Survey operations in progress until 06 sep by M/V geo caribbean towing 12 11200 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  45. HYDROLANT 2621/192019-08-29 → 2019-08-31
    Underwater operations 1100Z to 2100Z daily 28 aug thru 28 sep by M/V baru atria, M/V locar lh XXI, M/V locar…
    Western South Atlantic · Brazil-southeast Coast
  46. HYDROLANT 2619/192019-08-29 → 2019-09-02
    Survey operations 29 aug thru 05 sep by M/V subsea viking in area bound by 24-45.13S 042-38.90W, 24-35.72S…
    Western South Atlantic · Brazil-south Coast
  47. HYDROLANT 2618/192019-08-29 → 2019-09-05
    Survey operations in progress until 05 sep by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south Coast
  48. HYDROLANT 2561/192019-08-23 → 2019-08-30
    Survey operations 24 thru 31 aug by M/V geo caribbean towing 12 11200 meter long cables in area bound by…
    Western South Atlantic · Brazil-southeast Coast
  49. HYDROLANT 2560/192019-08-23 → 2019-08-27
    Survey operations 24 thru 27 aug by M/V hai yang shi you 720 towing ten 12000 meter long cables in area…
    Western South Atlantic
  50. HYDROLANT 2559/192019-08-22 → 2019-08-29
    Survey operations in progress until 28 aug by M/V vantage towing six 155 meter long cables in area bound by…
    Western South Atlantic · Brazil-south 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 19 · seahazards