Two. The 15km transmission distance can only be realized beneath the FCC standard when calculated in an outdoor natural environment without having interference. The SRRC standard is adopted in mainland China, along with the furthest transmission length is 8 km. Mavic 3M with RTK module for centimeter-level positioning. Flight Command, https://m3mhomes.com/commercial/m3m-route-65-sector-65-gurgaon/