Output GPS coordinates through serial

Hello everyone, I want to output GPS coordinates to my lens OSD through the serial channel of navigator.

Current architecture:
Flight control setting part: serial4(BAUD:230400,PROTOCOL:5), serial3(BAUD:57600,PROTOCOL:1) SR3_POSITION:20

Hardware part: GPS is installed on serial4, TX of serial3, RX and TX of the
lens, RX is reversely connected to GND

The above architecture is normal when I use cube orange