Hi gents,
One thing to point out here, and has been mentioned elsewhere, the difference between EFB and moving map GPS. The charts and documents are an approved replacement for paper copies, the issue is really using the GPS side of things. If this was to be disabled during training then you could use the EFB much the same way as paper.
But even if the GPS is on, it can be used to supplement DR navigation. Just need to have an instructor who can understand the balance between the two.
Best article I've seen about this is on the ozrunways blog, link below, scroll down to the question
"But I heard we can’t use OzRunways as the primary means of navigation, how can it be legal?"
Replacing paper – Sources of aeronautical information and primary means of navigation: what are the rules?