PDA systems, devices and methods are provided for improved navigational route
planning. The PDA provides more understandable, accurate and timely information
for negotiating a decision point along a route. The PDA includes a processor operable
to communicate with a memory. The memory has cartographic data and a route to a
desired destination stored therein. The cartographic data includes data indicative
of thoroughfares of a plurality of types. A display is provided which is adapted
to communicate with the processor and the memory and which is capable of displaying
the cartographic data. The PDA processes travel along the route. The PDA recognizes
when the device is approaching a decision point in the route and provides to the
display an overlay screen on top of any presently displayed screen, the overlay
screen adapted to display a preview of a decision point.
