I'm running 3.4.2 Arming checks

I can arm my Pixhawk without it doing arming checks, even though they are turned on in Mission Planner. i.e No Sats etc.

Is there another param. that needs to be changed?

What mode are you trying to arm in? If you’re arming in a mode that doesn’t require GPS lock, then it will arm (i.e. AltHold, Stabilize, etc).

Thanks I tried that and it worked. What would happen if I took off in Stabilize mode then switched into PosHold or Auto before it had enough Sat’s to carry out the Mission.

It would reject the mode change and stay in the mode you were in.