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 815/182018-03-07 → 2018-04-22
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  2. HYDROLANT 811/182018-03-07 → 2018-03-16
    Survey operations 08 thru 15 mar by M/V marpex X in area bound by 07-30.0S 034-28.8W, 07-30.0S 034-24.6W,…
    Western South Atlantic · Brazil-northeast Coast
  3. HYDROLANT 794/182018-03-06 → 2018-05-03
    Survey operations in progress until further notice by M/V ramform sterling towing 6000 meter long cable in…
    Eastern South Atlantic Angola · Congo
  4. HYDROLANT 751/182018-03-02 → 2018-03-07
    Survey operations 03 thru 06 mar by M/V oceanic champion towing 12 9260 meter long cables in area bound by…
    Western South Atlantic
  5. HYDROLANT 664/182018-02-26 → 2018-04-13
    Survey operations in progress until further notice by M/V ramform hyperion towing 9000 meter long cable in…
    Eastern South Atlantic · Namibia
  6. HYDROLANT 629/182018-02-22 → 2018-04-20
    Survey operations in progress until further notice by M/V discovery a. in area between 49-30S 51-30S and…
    Western South Atlantic
  7. HYDROLANT 621/182018-02-22 → 2018-03-04
    Survey operations 23 feb thru 03 mar by M/V oceanic champion towing 12 9260 meter long cables in area bound…
    Western South Atlantic
  8. HYDROLANT 577/182018-02-17 → 2018-02-25
    Survey operations in progress until 24 feb by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic
  9. HYDROLANT 565/182018-02-16 → 2018-02-28
    Underwater operations 1000Z to 2000Z daily 17 thru 28 feb by M/V log-in resiliente in 20-18.0S 040-11.5W
    Western South Atlantic · Brazil-southeast Coast
  10. HYDROLANT 560/182018-02-16 → 2018-02-24
    Survey operations in progress until 23 feb by M/V hugin explorer in area bound by 25-28.93S 042-49.79W,…
    Western South Atlantic
  11. HYDROLANT 534/182018-02-13 → 2018-02-28
    Underwater operations 1000Z to 2000Z daily 15 thru 28 feb by M/V nm seaforce, M/V proboat and M/V alta…
    Western South Atlantic · Brazil-southeast Coast
  12. HYDROLANT 529/182018-02-13 → 2018-02-22
    Survey operations in progress until further notice by M/V discovery in area bound by 49-30S 038-00W 51-30S…
    Western South Atlantic
  13. HYDROLANT 519/182018-02-13 → 2018-04-30
    Underwater operations in progress until further notice by M/V ya toivo in: a. 26-56.78S 015-09.85E
    Eastern South Atlantic · Namibia
  14. HYDROLANT 494/182018-02-11 → 2018-02-19
    Survey operations in progress until 18 feb by bgp challenger towing one 12000 meter long cable in area bound…
    Western South Atlantic
  15. HYDROLANT 462/182018-02-09 → 2018-02-16
    Survey operations in progress until 16 feb by M/V hugin explorer in area bound by 25-28.93S 042-49.79W,…
    Western South Atlantic
  16. HYDROLANT 461/182018-02-09 → 2018-02-18
    Survey operations in progress until 17 feb by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic
  17. HYDROLANT 440/182018-02-07 → 2018-02-21
    Survey operations in progress until 20 feb by M/V ramform tethys and M/V thor modi towing 16 8100 meter long…
    Western South Atlantic · Brazil-north Coast
  18. HYDROLANT 438/182018-02-07 → 2018-02-09
    Survey operations in progress until 10 feb by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic
  19. HYDROLANT 414/182018-02-05 → 2018-02-19
    Survey operations in progress until further notice by M/V ramform sterling towing 7000 meter long cable in…
    Eastern South Atlantic · Angola
  20. HYDROLANT 409/182018-02-05 → 2018-02-05
    Survey operations in progress until further notice by M/V ramform sterling towing 7000 meter long cable in…
    Eastern South Atlantic · Angola
  21. HYDROLANT 397/182018-02-03 → 2018-02-12
    Survey operations 04 thru 11 feb by M/V bgp challenger towing 12000 meter long cable in area bound by 28-09S…
    Western South Atlantic
  22. HYDROLANT 378/182018-02-02 → 2018-02-09
    Survey operations in progress until 08 feb by M/V osprey explorer towing three 250 meter long cables in area…
    Western South Atlantic
  23. HYDROLANT 377/182018-02-02 → 2018-02-05
    Survey operations in progress until 04 feb by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  24. HYDROLANT 361/182018-02-01 → 2018-02-09
    Survey operations in progress until 09 feb by M/V hugin explorer in area bound by 25-28.93S 042-49.79W,…
    Western South Atlantic
  25. HYDROLANT 336/182018-01-30 → 2018-02-26
    Survey operations in progress until further notice by M/V ramform hyperion towing 9000 meter long cable in…
    Eastern South Atlantic · Namibia
  26. HYDROLANT 330/182018-01-29 → 2018-03-01
    Underwater operations 1100Z to 2000Z daily 30 jan thru 01 mar by M/V silencio IV in 21-36.56S 040-01.02W
    Western South Atlantic · Brazil-southeast Coast
  27. HYDROLANT 299/182018-01-27 → 2018-02-05
    Survey operations 28 jan thru 04 feb by M/V bgp challenger towing 12000 meter long cable in area bound by…
    Western South Atlantic
  28. HYDROLANT 284/182018-01-26 → 2018-02-15
    Underwater operations 1000Z to 2000Z daily 27 jan thru 15 feb by M/V seapace, M/V proboat and M/V alta…
    Western South Atlantic · Brazil-southeast Coast
  29. HYDROLANT 277/182018-01-25 → 2018-02-01
    Survey operations 26 jan thru 02 feb by M/V hugin explorer in area bound by 25-28.93S 042-49.79W, 25-33.79S…
    Western South Atlantic
  30. HYDROLANT 273/182018-01-25 → 2018-02-02
    Survey operations 26 jan thru 03 feb by M/V oceanic champion towing 12 9260 meter long cables in area bound…
    Western South Atlantic · Brazil-southeast Coast
  31. HYDROLANT 230/182018-01-21 → 2018-01-29
    Survey operations in progress until 28 jan by M/V bgp challenger towing 12000 meter long cable in area bound…
    Western South Atlantic
  32. HYDROLANT 228/182018-01-20 → 2018-03-07
    Underwater operations in progress until further notice by: a. M/V mafuta in 28-33.0S 015-55.0E
    Eastern South Atlantic · Namibia
  33. HYDROLANT 216/182018-01-19 → 2018-01-25
    Survey operations in progress until 27 jan by M/V oceanic champion towing 12 10000 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  34. HYDROLANT 207/182018-01-18 → 2018-01-22
    Survey operations in progress until 21 jan by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  35. HYDROLANT 205/182018-01-17 → 2018-01-25
    Survey operations in progress until 26 jan by M/V hugin explorer in area bound by 25-28.93S 042-49.79W,…
    Western South Atlantic
  36. HYDROLANT 157/182018-01-14 → 2018-01-21
    Survey operations in progress until 20 jan by M/V bgp challenger towing 12000 meter long cable in area bound…
    Western South Atlantic
  37. HYDROLANT 135/182018-01-12 → 2018-02-08
    Underwater operations 1000Z to 2000Z daily 13 jan thru 08 feb by M/V mn marista np, M/V proboat and M/V alta…
    Western South Atlantic · Brazil-southeast Coast
  38. HYDROLANT 134/182018-01-12 → 2018-02-08
    Underwater operations 1000Z to 2000Z daily 13 jan thru 08 feb by M/V new commander, M/V proboat and M/V alta…
    Western South Atlantic · Brazil-southeast Coast
  39. HYDROLANT 133/182018-01-12 → 2018-01-18
    Survey operations in progress until 18 jan by M/V oceanic champion towing 12 9260 meter long cables in area…
    Western South Atlantic · Brazil-southeast Coast
  40. HYDROLANT 122/182018-01-11 → 2018-01-18
    Survey operations in progress until 17 jan by M/V hugin explorer in area bound by 25-28.93S 042-49.79W,…
    Western South Atlantic
  41. HYDROLANT 121/182018-01-11 → 2018-02-02
    Survey operations in progress until 02 feb by M/V osprey explorer towing three 250 meter long cables in area…
    Western South Atlantic
  42. HYDROLANT 72/182018-01-07 → 2018-01-15
    Survey operations in progress until 14 jan by M/V bgp challenger towing 12000 meter long cable in area bound…
    Western South Atlantic
  43. HYDROLANT 41/182018-01-04 → 2018-01-08
    Survey operations in progress until 07 jan by M/V bpg challenger towing 12000 meter long cable in area bound…
    Western South Atlantic
  44. HYDROLANT 34/182018-01-04 → 2018-01-11
    Survey operations in progress until 12 jan by M/V hugin explorer in area bound by 25-28.93S 042-49.79W,…
    Western South Atlantic
  45. HYDROLANT 33/182018-01-04 → 2018-01-11
    Survey operations in progress until 11 jan by M/V osprey explorer towing three 250 meter long cables in area…
    Western South Atlantic
  46. HYDROLANT 4211/172017-12-28 → 2018-01-04
    Survey operations 28 dec thru 03 jan 18 by M/V osprey explorer towing three 250 meter long cables in area…
    Western South Atlantic
  47. HYDROLANT 4210/172017-12-28 → 2018-01-04
    Survey operations 28 dec thru 04 jan 18 by M/V hugin explorer in area bound by 25-28.93S 042-49.79W,…
    Western South Atlantic
  48. HYDROLANT 4162/172017-12-23 → 2017-12-31
    Survey operations in progress until 30 dec by M/V bgp challenger towing 12000 meter long cable in areas…
    Western South Atlantic
  49. HYDROLANT 4161/172017-12-23 → 2017-12-28
    Survey operations in progress until 30 dec by M/V osprey explorer towing three 250 meter long cables in area…
    Western South Atlantic
  50. HYDROLANT 4152/172017-12-21 → 2017-12-28
    Survey operations 22 thru 29 dec by M/V hugin explorer in area bound by 25-28.93S 042-49.79W, 25-33.79S…
    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 26 · seahazards