In general, Garmin doesn't play nicely with others. By "navigational equipment", do you mean like a GTN650 or 750, to exchange flight plan and/or ADSB data with iFly? Or do you mean like a GFC500 autopilot, where you could use iFly as the GPS nav system to drive it (GFC500 follows iFly's magenta line)?
Either way, I think the answer is "you can't do that", but other folks smarter than me would be able to answer that definitively once they know exactly what you're asking.