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The map data they've been able to use successfully so far don't have directional information for the roads, so it will sometimes direct you the wrong way down a one-way street, for example.
Yes, it's basicaly the difference between jpegs and vector graphics. No navigate you need to know if that line is road or a county line or if the two lines crossing means an intersection where you can turn right, or an overpass with no onramps.
Wait, Tony, you just said "the map dada they've been able to use successfully"? What map data is this? All I've seen is the GPS project displaying cordinates.
Matthew
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