I don't know how you come to the conclusion that it's PPC-based at all. If anything, it's likely to be Symbian-based.

Oh wait. I forgot that they didn't produce a Palm verision of Navigator for a few releases. Hmm. I suppose your notion is possible, but I don't think so. The TomTom guys have been writing cross-platform handheld apps for over a decade.
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Bitt Faulk