EMLID Reach M2 is a multi-frequency RTK GNSS receiver with centimeter accuracy, eg for UAV use and object movement monitoring. The M2 is a very cost-effective solution for many purposes. Can be used with the free Reach View app (Android, iPhone and PC). The RTK correction signal can be obtained, for example, from another RS2 navigator (free of charge via the LoRa network with a separate modem), from a commercial VRS network or as free NTRIP correction data via the GSM network. M2 receivers are often used as base stations or drone measurements, using the PPK reception mode. There are also ready-made building kits from Mettatec for these purposes here.