The Toknav TSA320 is an external GNSS survey antenna that tracks four satellite systems (GPS, GLONASS, BDS, Galileo) plus QZSS, SBAS and IRNSS across full frequency bands for millimeter-level positioning accuracy. It has an IP67-rated ruggedized housing (about 142mm diameter x 66.5mm, ~450g) suited to outdoor use in land surveying, marine and channel measurement, and structural/landslide monitoring.