I can see that for some applications it can be nice to not display navigation info when printing. However, if information is being displayed (not printed), I can't see the utility of Navigation parts, since the same effect when displaying a list is easily accommodated by simply putting navigation buttons, along with any other information, into the usual header and footer parts.
In other words, the use of navigation parts appears to me to be useful only as a printing option...but not much else. Perhaps I'm missing something here ?
Comments would be appreciated.