The trouble with GPS is you can get lazy and lose the necessary skills required for map and compass nav. I see it all the time with my FO's who rely too much on our FMS. Ask 'em to navigate with a chart or even VOR's and they get completely lost. Don't even bother trying to ask them to fly a departure using raw data! Ask them where they would go if it all went quiet and they're straight into the magic box trying to find out where they are! What happened to navigating and looking out of the window?
At the end of the day use what you feel most comfortable with but always maintain those basic skills because you WILL need them one day. How often does a map go wrong or the battery goes flat?
When the turds hit the turbines I'd give you 10-1 that Whirls will sort out the situation much more efficiently than someone who has become too reliant on an electronic gizmo. RUBBISH IN RUBBISH OUT.
Soldier on Whirls there aren't many of us left
Edit: All very well Wile. E. Until you have aradio failure. Just something to consider.