Emlid makes affordable and easy to use RTK GNSS receiver Reach, that provides centimeter accuracy for surveying and navigation. Reach comes with an app as a controller.
GPS/QZSS, GLONASS L1, L2; BeiDou B1, B2; Galileo E1, E5
LoRa 868/915 MHz, range up to 8 km
LiFePO4 battery, 6–40V input, USB charging
For connection with other devices
— Reach RS2 — Carry case with a strap — Radio antenna — USB-C cable