I wasn't aware that there was a digital version, although that might explain the tremendous price differentials I've seen between the various online retailers offering the Navitool. I think I'd be apt to stay with the low-tech battery-less rendition for the sake of reliability.

Near as I can tell - based solely upon the one grainy picture I have of this device - the compass appears to attach over top the built in signal mirror, presumably protecting both items. I can't see how or if the whistle is attached, though I can't hardly imagine they'd just leave it to dangle loose on a cord. <img src="images/graemlins/shocked.gif" alt="" />