On Friday, August 16, 2013 1:39:23 PM UTC+2, Paul Remde wrote:
They don't trust PDA/PNA devices because they
think someone could write software to intercept and change the GPS data
before it is recorded. I don't agree with them on this, but that is I
understand their position.

You don't agree that somebody could write a software to fake GPS positions? Seriously?

It's a technical fact that this can be done, and it's fairly easy. I do it all the time while I develop XCSoar, to test the software I write.

Your personal opinion on this is provably wrong. Stuff like that cannot be decided by consensus or personal opinion - if it's technically doable, no opinion can ever make it impossible.

(With some more effort, all loggers, even sealed ones, can be spoofed, without ever touching the logger - this has been demonstrated last week by the University of Texas. Never say never.)