What should I consider when choosing an external GNSS/GPS device? – Agri Info Design Help Center

Please use an external GNSS/GPS device to increase the accuracy of location information.

Classification	positioning system	Equipment	Accuracy	measurement error	Work guidelines
low precision	single positioning	Smartphones and tablets	2.5m	50cm-2m	Fertilizer application and reversing work in grassland. The main purpose is to check the work trail. It is not suitable for straight-line work.
Medium accuracy	single positioning DGPS	-	2.5m	30cm-1m	Fertilizer application and raking with a broadcaster.
High precision	single positioning DGPS	AgriBus-GMiniR AgriBus-G2	0.5m-1m	10-20cm	Tilling,soil breaking,Land preparation, etc.
Ultra-high precision	RTK	AgriBus-GMiniR AgriBus-G2	2cm-5cm	Less than 10cm	Sowing, etc.

Notes.

Wired connection via USB
Some smartphones and tablets may not allow USB connection or may limit the power supply to the smartphone or tablet itself. This depends on the specifications of the phone or tablet, and we cannot provide support for this.
Wireless connection via Bluetooth
It is stable and less prone to connection and power supply problems with smartphones and tablets.Wireless connection via Bluetooth is recommended for use with AgriBus-NAVI.It is also possible to use a GNSS receiver that supports RS232C output by connecting it to a Bluetooth/serial converter (e.g. RATOC REX-BT60).