Convertibility of different GPS mapping format

Hi all,

i am a newbie :doubt::doubt:in this mapping arena. I am curious and yet confuse by all these mapping concepts and terminologies.

Understand that routing and way-points are usually stored in non-non proprietary file format (like GPX) which can be easily converted into other format using software like gpsbabel so that anyone can create and share their routes in various platforms (be it dedicated GPS units or phone based apps).

How about maps? Can proprietary maps be easily converted from img to imi etc?

Thanks so much.