So why don't you use nRoute? You can use g2 maps in combination with Homeport / nRoute if you split the g2 maps (or .img topo maps) with GmapTool + cGPSMapper, unlock the resulting map with mapsource unlocker and install the map via the bat file.
This method is also interesting if you use just Homeport: you don't need a flash card.
As the graphics support of nRoute is a bit old you don't get the eye-candy Homeport offers but all the navigation info is there.
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