Your best chance is to post another thread regarding problem with Sygic running on 800x480 for WinCE and hope that somebody who successfully did it would help. I run Sygic a long time ago on 320x240 and it works fine, but that doesn't mean jack since Sygic is notorious for introducing problem in new releases. I know that you're interested in fixing iGO8/Primo problem, but finding a solution for Sygic (hopefully someone will tell you which release work on 800x480) might shed some light on why your problem exists.
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