Legally, yes, but if you've got Foreflight you're still in pretty good shape. Having had a complete panel failure one evening on an IFR flight (dead radios, dark cockpit, no transponder, the works), I can testify that it is actually fairly easy to fly an approach with a G5 (on battery power) and an iPad. Moreover, the FAA is surprisingly happy with this procedure so long as you call them IMMEDIATELY after landing and later give them a very thorough explanation. 😅