you can use a standard sd card with Igo (Igo9)(Wince 6.0) on it.
change the front name Igo to navigation and in the list Igo.exe to navigation.exe.
download the license map for the clarion lyc
in the sys.txt
[device]
type=CLARION_NX501ER
if you need to try the Igo, send me a pm.
I have a working NX403EV Igo.
only no voice, working on it