Does IO540 have some sort of obsession with GPS? My comment would have been exactly the opposite - I think he reached for GPS too early, unless he was just turning it on ready to use if the situation was not quickly resolved. It is very easy for someone to get focussed on something with a moving map at the expense of the flight instruments. There are other things that take priority, and other ways of resolving the problem that should be tried before reaching for the GPS to navigate. By the time they have been run through the GPS will have its first fix.
I think I'd quite like to fly with Chilli though.