Ahhhhh .... see my 'bearing error' post. This is what I have seen. Note, I'm not using a 496 but rather a system called TrueMap (www.aviationsafety.com) displayed on a tablet pc. When I look at the XRX screen under certain circumstances, I see a significant bearing error in what is displayed on the pc. When I use just the XRX screen, it seems well aligned to the actual traffic. Been trying to nail the problem down ... with your post, it seems to be a problem with the interface the XRX is communicating to the external display. I'll share this with my software vendor - it may help nail the problem down.