I'm running SD the latest spec Ipad mini paired up to a Garmin GLO bluetooth reciever and I've yet to see any glitching or crashes, although I do hold off on IOS updates until they've been around for a few weeks (I'm not 100% confident in Apples' release testing!). It sits in my Ipad kneeboard and is usually covered over so it's not too distracting. I'll flip the cover and have a look during a FREDA check.
I also have it installed and ready to go on my android phone.
And the third tier backup is a quarter mill paper chart with the route drawn!