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Hmmmm...this might be a bit problematic. According to generally accepted UI guidlines, the same user input ought to result in the the same reaction/output/behavior unless a different "mode" is clearly recognizable to the user. In the situation at hand, it seems a bit arbitrary to bring up the PLOG on every but the last leg of a route (as evidenced by the previous poster's comment). In the intereest of a clean UI it might be better always and consistently to do either one or the other.
It might be a good idea to include a Help menu which brings up screen hints and shows the user what he can tap and to what end (the iPhoto app does this very nicely). There is now sufficient complexity that one can't simply divine which area to tap to get which result. I know, you can always read the manual, but who really ever does...
Greetings, -- Chris.
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