Navigation system
View Patent ↗A navigation system comprises: a GPS for detecting a current position; a DVD drive for reading a map from a DVD on which a plurality of partially overlapping maps are recorded; a Memory card for storing information to identify a portion overlapping with another map, in a map being used for navigation; and a CPU for judging, based on coordinates of a current position and the information stored in the Memory card, whether the coordinates of the current position are contained in the overlapping portion or not, and for controlling, in response to a judgment that the coordinates of the current position are contained in the overlapping portion, the DVD drive to read from the DVD the map sharing the overlapping portion. Consequently, map data to be loaded can be smoothly changed according to the current position.
1. A navigation system comprising:
a recording medium on which a plurality of partially overlapping maps are recorded;
a reading unit for reading the plurality of partially overlapping maps from the recording medium;
a storage unit for storing the plurality of partially overlapping maps and storing information to identify a portion of an adjacent map overlapping with a map being used for navigation; and
a control unit for judging, based on coordinates of a current position and the information stored in the storage unit, whether the coordinates of the current position are contained in the overlapping portion or not, and for controlling, when the coordinates of the current position are judged to be contained in the overlapping portion, the storage unit to output the adjacent map sharing the overlapping portion.
2. The navigation system according to claim 1 , wherein the reading unit reads the plurality of partially overlapping maps from a portable recording medium inserted therein.
3. The navigation system according to claim 2 , wherein the control unit, when coordinates of a current position are judged to be contained in the overlapping portion and the adjacent map is not stored in the storage unit, induces a user to insert the recording medium into the reading unit.
4. The navigation system according to claim 1 , wherein the storage unit is a memory card.
5. A navigation system comprising:
a recording medium on which a plurality of partially overlapping maps are recorded;
a display unit for displaying a map in a scrollable manner;
a reading unit for reading the plurality of partially overlapping maps from the recording medium;
a storage unit for storing the plurality of partially overlapping maps and storing information to identify a portion of an adjacent map overlapping with the map being displayed on the display unit; and
a control unit for judging, based on an area displayed on the display unit and the information stored in the storage unit, whether the overlapping portion stored in the storage unit is contained in the area displayed on the display unit or not, and for controlling, when the overlapping portion is judged to be contained in the area displayed on the display unit, the storage unit to output the adjacent map sharing the overlapping portion.
6. A computer-readable storage medium storing:
a plurality of partially overlapping maps; and
identification information to identify a portion of a map overlapping with another map in each of the plurality of maps, the plurality of maps and the information being stored on the computer-readable storage medium in association with each other, the computer readable storage medium controlling a computer to display the maps.