GPS antenna scematic for nRF9160

Hello

We are trying to finalize the layout we need for a nRF9160 module with gps capabilities.

I have downloaded the schematics and layout for the devkit V0.8.5.

what we need to know is since we are only planning on using the passive gps antenna do we need the two swiches and the full network or can we just use the matching network and the passive antenna.

Also what is the purpose of disabling the passive GPS antenna ?