I think a useful feature would be the ability to draw your
intended route on the maps in map mode using the
stylus. This would allow you to plan your route in the
comfort of your own home, then when you were on the
road you would only need to follow the line in GPS mode.
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This add possibility to voice navigation feature. If you
make vector route plan, then it is easy just play wav files
like "turn right in 100m" or "Please now turn right". No
text-to-speach needed with this.