NAVPad Power harness is meant to power just the NAVPad itself. You could upgrade to our deluxe power harness which will power a WX Receiver, GPS, and/or a PDA/XM Music Player
As far as the operation of the Navair system I have been overwhelmingly impressed. Having the weather constantly displayed and automatically updated is unbelievably reassuring when flying through IMC. I can't believe I ever flew without it.