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 68/232023-01-09 → 2023-01-18
    Survey operations 10 thru 17 jan by M/V ramform tethys towing 12 6000 meter long cables in area bound by…
    Western South Atlantic · Brazil
  2. HYDROLANT 64/232023-01-08 → 2023-01-17
    Survey operations 09 thru 16 jan by M/V pgs apollo towing six 400 meter long cables in area bound by…
    Western South Atlantic · Brazil
  3. HYDROLANT 42/232023-01-05 → 2023-02-27
    Survey operations in progress until further notice by M/V ramform vanguard towing 12 6500 meter long cables…
    Eastern South Atlantic · Angola
  4. HYDROLANT 22/232023-01-03 → 2023-01-10
    Survey operations in progress unti 09 jan by M/V sw diamond towing nine 225 meter long cables: a. 030300Z to…
    Western South Atlantic
  5. HYDROLANT 3/232023-01-01 → 2023-01-10
    Survey operations 02 thru 09 jan by M/V pgs apollo irin towing six 400 meter long cables in area bound by…
    Western South Atlantic · Brazil
  6. HYDROLANT 3310/222022-12-27 → 2023-01-11
    Survey operations in progress until 10 jan 23 by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  7. HYDROLANT 3306/222022-12-27 → 2023-01-02
    Survey operations 270300Z dec to 020259Z jan 23 by M/V sw diamond towing nine 225 meter long cables in area…
    Western South Atlantic
  8. HYDROLANT 3291/222022-12-24 → 2023-02-14
    Underwater operations in progress until further notice by M/V coral sea in 28-30.60S 015-52.90E
    Eastern South Atlantic · Namibia
  9. HYDROLANT 3273/222022-12-22 → 2022-12-27
    Survey operations in progress until 03 jan 23 by M/V ramform tethys towing 12 six meter long cables in area…
    Western South Atlantic · Brazil
  10. HYDROLANT 3250/222022-12-20 → 2022-12-26
    Survey operations 200300Z to 260300Z dec by M/V sw dimond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  11. HYDROLANT 3236/222022-12-19 → 2022-12-27
    Survey operations in progress until 26 dec by M/V pgs apollo towing six 400 meter long cables in area bound…
    Western South Atlantic · Brazil
  12. HYDROLANT 3228/222022-12-17 → 2023-01-02
    Underwater operations 181000Z dec to 022000Z jan 23 by M/V bulk venus in 20-27.12S 040-08.02W
    Western South Atlantic · Brazil
  13. HYDROLANT 3210/222022-12-15 → 2022-12-18
    Survey operations in progress until 17 dec by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  14. HYDROLANT 3203/222022-12-14 → 2022-12-20
    Survey operations by M/V sw diamond towing 9 cables with 225 meters: a. 130300Z thru 160259Z dec in area…
    Western South Atlantic
  15. HYDROLANT 3200/222022-12-14 → 2023-02-13
    Survey operations in progress until further notice by M/V sw empress in area bound by 29-02.55S 012-57.06E,…
    Eastern South Atlantic
  16. HYDROLANT 3179/222022-12-11 → 2022-12-19
    Survey operations in progress until 19 dec by M/V pgs apollo towing six 400 meter long cables in area bound…
    Western South Atlantic · Brazil
  17. HYDROLANT 3178/222022-12-11 → 2022-12-19
    Survey operations in progress until 18 dec by M/V oceanic vega towing ten 12964 meter long cables in area…
    Western South Atlantic
  18. HYDROLANT 3153/222022-12-08 → 2022-12-21
    Survey operations 100001Z to 202359Z dec by M/V rs macae in 22-08.25S 040-09.52W
    Western South Atlantic · Brazil
  19. HYDROLANT 3149/222022-12-08 → 2022-12-15
    Survey operations in progress until 16 dec by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  20. HYDROLANT 3139/222022-12-07 → 2022-12-30
    Underwater operations 1100Z to 2000Z daily 07 thru 30 dec by M/V bravo mar II and M/V nm asl crystal in…
    Western South Atlantic · Brazil
  21. HYDROLANT 3138/222022-12-07 → 2022-12-15
    Underwater operations 1100Z to 2000Z daily 08 thru 15 dec by M/V r. neto I and M/V nm bbc rushmore in…
    Western South Atlantic · Brazil
  22. HYDROLANT 3113/222022-12-05 → 2022-12-14
    Survey operations 06 thru 13 dec by M/V sw diamond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  23. HYDROLANT 3112/222022-12-05 → 2022-12-13
    Survey operations in progress until 12 dec by M/V subsea viking along trackline joining 24-58.46S…
    Western South Atlantic
  24. HYDROLANT 3111/222022-12-05 → 2022-12-11
    Survey operations in progress until 12 dec by M/V oceanic vega towing ten 12964 meter long cables in area…
    Western South Atlantic
  25. HYDROLANT 3104/222022-12-04 → 2022-12-11
    Survey operations in progress until 12 dec by M/V pgs apollo towing six 400 meter long cables in area bound…
    Western South Atlantic · Brazil
  26. HYDROLANT 3093/222022-12-02 → 2022-12-07
    Survey operations in progress until 06 dec by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  27. HYDROLANT 3083/222022-11-30 → 2023-02-16
    Survey operations 01 dec thru 17 feb 23 by M/V ramford titan towing 12 11112 meter long cables, M/V thor…
    Eastern South Atlantic
  28. HYDROLANT 3071/222022-11-29 → 2022-12-06
    Survey operations in progress until 05 dec by M/V subsea viking along trackline joining 24-58.46S…
    Western South Atlantic
  29. HYDROLANT 3070/222022-11-29 → 2022-11-30
    Survey operations in progress until 29 nov by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  30. HYDROLANT 3060/222022-11-28 → 2022-12-02
    Survey operations in progress until 02 dec by M/V ramform tethys towing 12 6000 meter long cables in area…
    Western South Atlantic · Brazil
  31. HYDROLANT 3059/222022-11-28 → 2022-12-02
    Survey operations in progress until 01 dec by M/V oceanic vega towing ten 12964 meter long cables in area…
    Western South Atlantic
  32. HYDROLANT 3058/222022-11-28 → 2022-12-06
    Survey operations in progress until 05 dec by M/V pgs apollo towing six 400 meter long cables in area bound…
    Western South Atlantic · Brazil
  33. HYDROLANT 3044/222022-11-26 → 2022-11-27
    Underwater operations 1100Z to 2000Z daily 26 and 27 nov by M/V golden arcus and M/V silencio IV in area…
    Western South Atlantic · Brazil
  34. HYDROLANT 3043/222022-11-26 → 2022-11-29
    Survey operations in progress until 28 nov by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  35. HYDROLANT 3005/222022-11-23 → 2022-11-26
    Survey operations in progress until 25 nov by M/V sw diamond towing nine 225 meter long cables in area bound…
    Western South Atlantic
  36. HYDROLANT 2986/222022-11-21 → 2022-11-28
    Survey operations in progress until 27 nov by M/V oceanic vega towing ten 12964 meter long cables in area…
    Western South Atlantic
  37. HYDROLANT 2985/222022-11-21 → 2022-11-29
    Survey operations in progress until 28 nov by M/V pgs apollo towing six 400 meter long cables in area bound…
    Western South Atlantic · Brazil
  38. HYDROLANT 2978/222022-11-20 → 2022-11-29
    Survey operations in progress until 28 nov by M/V subsea viking along trackline joining 24-58.46S…
    Western South Atlantic · Brazil
  39. HYDROLANT 2968/222022-11-19 → 2023-03-18
    Underwater operations 19 nov thru 17 mar 23 by M/V santos solution and M/V navegantes pride in areas bound…
    Western South Atlantic · Brazil
  40. HYDROLANT 2964/222022-11-18 → 2022-11-29
    Survey operations in progress until 28 nov by M/V ramform tethys towing twelve 6000 meter long cables in…
    Western South Atlantic · Brazil
  41. HYDROLANT 2956/222022-11-17 → 2022-11-22
    Survey operations 18 thru 21 nov by M/V sw diamond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  42. HYDROLANT 2948/222022-11-17 → 2022-11-24
    Underwater operations 1100Z to 2000Z daily 17 thru 24 nov by M/V msc aquarius and M/V r. neto I in 24-11.00S…
    Western South Atlantic · Brazil
  43. HYDROLANT 2923/222022-11-14 → 2022-11-19
    Survey operations 15 thru 18 nov by M/V sw diamond towing nine 225 meter long cables in area bound by…
    Western South Atlantic
  44. HYDROLANT 2922/222022-11-14 → 2022-11-23
    Survey operations 15 thru 22 nov by M/V subsea viking towing cables along trackline joining 24-58.46S…
    Western South Atlantic
  45. HYDROLANT 2910/222022-11-14 → 2022-11-21
    Survey operations in progress until 20 nov by M/V oceanic vega towing ten 12964 meter long cables in area…
    Western South Atlantic
  46. HYDROLANT 2909/222022-11-14 → 2022-11-22
    Underwater operations 1100Z to 2000Z daily 15 thru 22 nov by M/V r. neto I and M/V nm sifnos in 24-11.00S…
    Western South Atlantic · Brazil
  47. HYDROLANT 2903/222022-11-13 → 2022-11-21
    Underwater operations 141100Z to 212100Z nov by M/V r neto I, M/V ocean rhea and M/V beijing 2008 in…
    Western South Atlantic · Brazil
  48. HYDROLANT 2902/222022-11-13 → 2022-11-15
    Survey operations 14 nov by M/V sw diamond towing nine 225 meter long cables in area bound by 25-39.84S…
    Western South Atlantic
  49. HYDROLANT 2867/222022-11-10 → 2022-11-14
    Survey operations 11 thru 13 nov by M/V sw diamond towing nine 225 meter cables in area bound by 25-39.05S…
    Western South Atlantic
  50. HYDROLANT 2866/222022-11-10 → 2022-11-12
    Survey operations in progress until 11 nov by M/V sw diamond towing nine 225 meter cables in area bound by…
    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 5 · seahazards