thank you for your understanding and thanks for the help you try to provide, i will give the information i know and can find: the unit is called: KAV-9885S, screen resolution: 480x234, the system works on windows CE 6.0 in landscape mode. the seller gave an sd card with igo9 on it, but i get a message with a warning tht the resolution is not compatible with my device. And i have minimal experience with this kind of systems and navigations, its my first time. Also the seller is not responding anymore and i would like to get help with the problem i already told in the post here above. thak you for your help and understanding again.