The wxwks green light (data) blinks, and the single 4500 is configured as the master for weather. I have not activated the XM service- is that required for the weather page to be displayed? Probably not because what would be the difference between not aquiring the satellite and not having an xm subscription? So it seems I'm missing weather software on the 4500? I do plan on activating the XM subscription once over this hurdle. Thank you for the help- you guys are great.