In a GPS navigation apparatus, a procedure of preparation of route for navigation
using a specific point (WAY-POINT or MARK-POINT) established and registered by
the tracking function is simplified. A TRACK list picture is read out from a MENU
picture by the predetermined operation, and a desired TRACK name is designated
from the list. When a type the specific point is selected by the predetermined
operation to designate conversion from the TRACK to a ROUTE, position data of the
START POINT, the specific point of the selected type, and the DESTINATION POINT,
of the designated TRACK name are extracted, and interpolation data connecting the
positions by straight line in the time series sequence is produced to construct
a ROUTE for navigation. Conventionally, the selection has been made by each POINT
unit, however, an automatic conversion in a batch in a TRACK unit is employed,
and thus a route creating operation is extremely simplified.
