naza-m v2

So I'm sorta new to all of this so forgive me if I'm wrong. Does the Storm32 need to connect to the Naza or can it just connect to the transmitter for yaw, pitch, and roll? Also another side question, how many channels would I need for this setup exactly?

Hi, System: Flame wheel F550 Naza-M v2 Naza GPS Spektrum AR 8000 receiver Spektrum DX7i transmitter. The system worked well on my first flight test with one exception. When the transmitter is switched off to simulate loss of signal the F550 does not execute a RTH, but rather goes to F/S...