I installed the Imray app onto our IPad, but we don’t have the 3G version, so no GPS.
We used it on a flotilla holiday with the Ionian charts installed where it was easy to keep dry and could be charged daily; and we were able to use it alongside a chart plotter anyway. Found it OK as a visual reference, but don’t see how it could replace paper charts for passage planning.
I also have a few Tough Chart folios. I found them ideal for use on the Wayfarer and was disappointed to see they have been discontinued.