• Western boundary measurements have been collected continuously since March 2009 with an array of pressure-equipped inverted echo sounders (USA-NOAA) along 34.5S that have been supported with ship time and hydrographic (CTD) observations from partners in Argentina (CONICET/UBA/SHN) and Brazil (USP, Navy).
• In December 2012, this western array was augmented by three additional current-and-pressure-equipped inverted echo sounders (Brazil-USP).
• In December 2013, Brazil (USP) augmented the western array by adding a bottom pressure sensor and a moored ADCP on the western shelf and upper slope.
• France (LPO) deployed eight current-and-pressure-equipped inverted echo sounders and two bottom-moored ADCPs on the eastern boundary in September 2013.
• South Africa (UCT, DEA) deployed an array of short and tall moorings measuring temperature, salinity and velocity on the eastern boundary in September 2014. Since then an array of five to nine moorings has been maintained by France (LPO) and South Africa (UCT, DEA).
• France (LPO)/South Africa (UCT, DEA) deployed seven pressure-equipped inverted echo sounders along oblique Goodhope line in December 2014. This array is no longer sustained.
• Trans-basin expendable bathythermograph sections are collected quarterly (USA-NOAA) along 34.5S, with trans-basin conductivity-temperature-depth sections collected less frequently in the region of 25S-34.5S as well (USA-NOAA/NSF, United Kingdom, Brazil).
• A group of North and South American countries operating through the Intra-Americas-Institute for Climate Change Research (IAI) have a large shelf-monitoring program planned for the western boundary that complement well the western end of the trans-basin array (USA-MIT, USA-OSU, Argentina-SHN).
• In 2013, Germany (GEOMAR) deployed a western boundary current array of tall moorings as part of TMA-RACE, and and an eastern boundary current array of CPIES as part of SACUS, along 11S. Trans-basin and boundary transects are conducted on a regular basis.
• In January 2019, the SAMBA-W array at 34.5ºS was extended by including current-and-pressure-equipped inverted echo sounders E (31º 7’W) and F (18º49’W), equipped with PDS (popeyes datapod shuttles).
• February 2019 - A mooring with an AANDERA current meter and microcats were installed at Vema Channel (31º14’S, 39º23’W).
• In June 2019, current-and-pressure-equipped inverted echo sounder 0A (34° 24.270 S, 051° 35.390 W) was installed at the depth of 875 m to become the westernmost inverted echosounder of the array, to provide a more complete description of the western limit of the Brazil Current.
• Two new tall moorings near the western end of SAMBA will be deployed in 2022: A tall dynamic height mooring additionally equipped with current meters and biogeochemical sensors at the shelf break currently not sampled by the PIES/CPIES array (SHN-CONICET/AR; EU Horizon 2020 Research and Innovation Programme – iAtlantic and MinCyT/CONAE-AR) and a tall dynamic height mooring at the 3450 m isobath (EU Horizon 2020 Research and Innovation Programme – TRIATLAS)
• In 2021, Spain and Mexico deployed four PIES and three tall moorings nominally along 9°W, just east of the Mid-Atlantic Ridge, as part of the South Atlantic Gateway Array (SAGA) project. The southernmost mooring connects with the SAMBA line.

Other existing global in situ and satellite data sets will provide crucial information for analysis and attribution of the data from the recommended program:

• USA-NOAA/CIMAS has been funded to investigate the meridional variability of the SAMOC using altimetry observations; with a comparison/validation component using Argo, XBT, model-derived estimates.
• Several groups already collect additional hydrographic observations in the region that would be extremely valuable for analysis purposes (Argentina, Brazil, France, Germany, Spain, Russia, South Africa, the United Kingdom, the United States).
• The global observing system, particularly the Argo float network, the growing BGC and Deep Argo networks, the global drifter array, and satellite observations of sea height, sea-surface temperature, sea-surface salinity (SMOS and Aquarius), and surface wind will also be crucial for analysis and attribution of signals observed by the moored system.