I'd still like to remind that the route planning is not perfect -- or even near perfect. It has trouble guiding through some places, especially near complex junctions.

The main problem is that all guidance is based on the 2D vector map. There's no real information on crossroad or junctions. Everything is based on lines and line segments. The map conversion software figures out which roads connect to other roads, mostly based on angular differencies.

This problem has been overcome with the real navigation CD's in a way that all crossroads and junctions are modeled and they are gived a certain type. Therefore, you can determine upcoming crossroads more easily and also know what type of crossroad it is, and give better guidance.

Kim