I've been using TomTom Navigator 6 for quite some time starting with my Treo650 and then moving it over to my Centro. I'm doing a 100 mile bicycle tour with a crazy route, and turn by turn voice nav from my jersey pocket would help ensure I don't miss a turn out in the boonies. The only thing is, I've never really used TomTom for more than your typical point-to-point directions. Is it even possible to define your own turn by turn route ahead of time? If so, some insight on how to get started doing it would be great.