For Road Runner and IG3 you need XPort3, the com port splitter. No need for skinbedder or iGLaunch.
Set ignative=true in rr.ini
Put this line in exectbl.ini
"GPS","LOAD;EXTERNAL_GPS.skin;Navigation;C:\Progra m Files\iNav\iGuidance\iGuidanceUMPC.exe;iGuidance"
Don't copy the space in Program!
Now just call it by the command "GPS" on your button.
Here is screen cap of mine running.