Overfly,
You may have missed the point in all this mate.
As a GPS unit, your GPS may do nothing to the aircraft - but as a piece of eletronics - it may have the potential to do so [no matter how remote]. DCC [& others in this thread] appear to provide authoritative info for you
Like you aqnd others, I have used a hand held GPS [as a fast jet QFI 'cheating' on those low level tac navexs], and yes nothing happened - But I was Aircraft Captain, I knew it was operating, and I am aware of what EMF can do, AND as I was the primary Nav instrument, any interference to any other bits of kit [limited in a FJ trainer!] was minimised.
Those hand held units may not be a problem, but until someone qualified to SAY SO, actually SAYS SO, [and specifies aircraft type etc.], we in the aviation community must consider the consequences.
Further, at the end of the day - The Aircraft Captain IS THE AUTHORITY. If you don't like this then become one and discover the responsibility.
Enjoy those buttons on your nav kit.