I have both Primo 2 and also iGo 8. I have the dem file in the dem folder in iGo 8 but can't get it to show terrain on the screen. I have gone through the settings but can't see where to enable it etc. The dem/terrain looks fine in Primo 2 but slows it down. Does it slow it down in iGo8 as well? I have a 128Mb unit with a 400 cpu. All programmes and files are in device memory as no sd card slot.