Mission Planner GPS & Satellite connection problem


Hello,

I am currently using Piksi Multi & Ready to sky GPS. If I need to set Piksi as primary GPS and ready to sky as secondary GPS what should I do? Also, I was seeing GPS-3D fix at the beginning but later I am net seeing any 3D fix even if it is outside. How to fix it?
Also, I am seeing “sats=0” & “hdop=0.0” even it is outside. How to fix this?