To connect the SpeedyBee F405 V3 to GPS use the following wiring from the UART6 port,

See the table below, the orientation of the GPS module and Flight Controller should be as the image is arranged above (GPS module slightly to the right of the flight controller for annotation purposes).

Left Side	Right Side
SpeedyBee FV04 V3 Flight Controller	Beltian GPS BN-880	GPS Continued
Connector Pins UP	Connector Pins UP
4V5	VCC	D
G	GND	G
T6	RX	R
R6	TX	T
SDA	SDA	V
SCL	SCL	C

To configure the GPS in Betaflight, set the UART6 mode to GPS in the configuration tab, and the baud rate to Auto.