Quote Originally Posted by Auburntsts View Post
FWIW I have dual Nav/Com's and typically 5 GPS's (1 IFR (GTN 650) and 4 VFR--2 in the EFIS, my tablet, and my iPhone). Finally I have 3 sources for charts/plates: my EFIS, my tablet, and my phone.
Jeez, I was lucky to have two functioning nav/com radios when I got my IFR ticket.

terrykrummrey, Marc Z is spot on. I would not rely on any GPS based equipment as a flight instrument standby system. The only comment I will make is to wait until the last possible moment to buy your avionics because the market is quite fluid. I know of a protracted build that has two Blue Mountain EFIS units in it, ever heard of them? Marc Z probably even knows who I'm talking about.