Systems, devices and methods are provided for more efficient use of RAM
and other resources in connection with a route calculation algorithm which quickly
obtains a best or reasonable best path between two locations. The navigational
aid device includes forced layer switching capabilities. The navigational aid device
includes a processor and a memory adapted to communicate with the processor. The
memory has cartographic data including any number of locations and data indicative
of thoroughfares of a plurality of types connecting certain ones of the locations.
The plurality of thoroughfares are organized in a hierarchy of detail levels. The
processor operates on a route calculation algorithm to find a path between any
two of the number of locations and the route calculation algorithm dynamically
forces switching between different levels in the hierarchy of detail levels based
on a set of criteria.
