basically you load it up. Determine first what port your actual GPS is on.
Within the Xport program, you pick that source port and than you click on "virtual ports" at the bottom section.
Once you click "enable ports" these new virtual ports will be created. For mine, my GPS is on port 3 and i created virtual port 7 and 8.
From within the road runner config to enable the compass i said that my GPS was on port 7 and from within iguidance (or your GPS program of choice) i slected my gps to be on port 8.
Hope that helps.
BTW- Great skin CDRskull!