You are right about the distraction, could have been any heads-in reason, but fiddling with the GPS cost him an infringement.
I'll stick with my map for VFR, thanks - but what do I know?
Far in advance of anything you'll find in a commercial airliner and in my experience, probably more reliable!
Have flown about 9000 hours with two FMC/FMGC and never (touch wood) had a double failure, nor on 1000 hours with twin INS, map has never failed in flight either although I have spilled my coffee once or twice.