Anyone know if you can combine 3d files on the Zumo? I have a Zumo 660 with CN Europe (on device) and CN USA (on SD card) and it will not show the 3D USA map as an option. Tried the following:

gmap3d.img on SD card - does not work
gmap3d1.img on SD card - does not work
gmap3d1.img on device - does not work

Seems like the Zumo only like 1 3D file at a time. Sure wish they had the same naming ability as my Oregon (especially as they are the same company) - as long as it ends in .img, all is good (just not on the Zumo)