EK3_SRCn Explanation

ArduRover
1

In this documentation I am unable to fully understand how the EK3_SRC parameters are meant to be set.
https://ardupilot.org/plane/docs/common-ekf-sources.html

If I have 2 GPS do I set both EK3_SRC1_xx and EK3_SRC2_xx parameters?

Thanks