Unfortunately, I think there is no english manual. I know there was an english version of the SAS website but now it is closed. I have no idea what is the reason. You can visit this page:
and use google translate.
Please Login or Register to see the links
If your intentions are only to use the program for downloading satellite images, creating routes etc. and use them with/on your gps device I think with less then 15 minutes a person could learn how to manage without manual. But if your intentions are other let say developing plug-ins, using it on a GIS software, creating your own maps etc. you should better ask in the sas forum.