An off-board navigation system includes a remote unit and a supply
location. In operation, a navigation system user requests a desired route
to a destination. Capability information relating to the user's CPU and
storage device capacities are also preferably provided to the supply
location. Using the extensive database available at the supply location,
the supply location calculates a recommended route to the desired
destination in relation to the desired POIs. If the estimated size of the
requested route meets the capabilities of the remote unit the supply
location creates a filter using the requested parameters and applied to
the extensive database at the supply location. In one embodiment, the
filtered map area includes a width vector W defined substantially
perpendicular to the recommended route R. In another embodiment, the
filtered map area is defined in relation to a plurality of nodes N along
the recommended route R. A perimeter P is defined around each node N
along the recommended route R. Moreover, the type of road can be adjusted
to meet the capability information relating to the user's CPU and storage
device.