2. The 15km transmission distance can only be accomplished beneath the FCC conventional when calculated in an outside natural environment without the need of interference. The SRRC standard is adopted in mainland China, and also the furthest transmission distance is 8 km. Mavic 3M with RTK module for centimeter-amount positioning. https://m3mhomes.com/the-grand-property-sell-fest-by-m3m-smart-world-top-developers-may-16-18-2025/