Systems, devices and methods are provided for an improved navigational route
planning device which provides more understandable, accurate and timely information
for negotiating a decision point along a route. The navigational aid device includes
a processor adapted 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 device processes travel along
the route. The device 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.
