Easy to do on an iPad but not necessarily a good idea IFR.
Last week I was flying with my iPad and for a while it was showing my heading as 90 degrees different to what it actually was. I was VFR, so it was no problem, but I wonder whether it would cause situational awareness difficulties if it happened while IFR? Yes, pilots should be able to ignore the nice pictures and use the certified instruments, but it is very tempting to believe what the iPad is showing.