Bangle 2. How to set GPS Serial1 baud rate?

The wire between AT6558 and NRF52 is very short, so why not to set baud rate to 115200?

A GPS device does not need to send that much data. A fix is only 40-60 bytes and you dont need a fix more than once per second. It is fairly standard to default baud rates on serial devices to 9600. This dates back to the times when we connected terminals to mainframes in the dark ages before USB, the Internet etc etc.