Reading the Kenwood manual a bit more It says only the KNA-G630 is compatible whereas earlier models say the KNA-G610 and G630 are compatible. I'm guessing the KNA-G630 has an extra img_rsrc_800x###.Gir file in the Garmin directory which the KNA-G610 doesn't have.Not easy to find unless someone can plug there PC into the G610.