SPRacing F3 Evo setup for GPS,X4R, S.Port

I Have the SPRacingF3Evo and require to connect a GPS puck + X4RSB Rx + SmartPort of X4R …So how/which of the 3 UARTS 1,2 & 3 - do I use…joe

Hello again

It has happened damn - UART3 5volts lost no sign of magic smoke at the time the BN880 GPS module was connected but subsequently worked plugged into UART2

Uart2 voltage ok

Can someone please identify UART3 voltage regulator…joe

Q - Why has this post different fonts…