Ok, then we can try this, which might avoid a big trip into all the u-Center craziness:
Connect both GPSs (little board to the first SERIAL port in order, big board to the second) and power the autopilot on. Set the following in addition to the moving baseline instructions in the wiki:
- GPS_RATE_MS=200
- GPS_RATE_MS2=200
- GPS_DRV_OPTIONS=0
- GPS_SAVE_CFG=1
- GPS_AUTO_CONFIG=1
Wait for the saving config messages to appear (or reboot and wait for those messages, just to be sure), then set:
- GPS_AUTO_CONFIG=0
- GPS_SAVE_CFG=0
Now power off the autopilot and disconnect the moving base (little board) from the autopilot.
Connect that board to u-Center (230400 baud)
- Open configuration view.
- Navigate to UBX → CFG → PRT and change UART2 to 115200.
- Click the Send button.
- Navigate to UBX → CFG → CFG and select 0-BBR and 1-FLASH.
- Click the Send button.
Power off, reconnect to the autopilot, and see how that works.