Navigation system
First Claim
Patent Images
1. A navigation system comprising:
- a present position detecting device for detecting a present position;
a plurality of memory devices each capable of reading out map data which is recorded therein;
a navigation controlling device for controlling a navigation operation in correspondence with the detected present position by using the map data; and
a map data reading device for accessing one of the memory devices, which is selected in accordance with a predetermined condition, and reading out the map data required for the navigation operation therefrom.
1 Assignment
0 Petitions
Accused Products
Abstract
A first navigation system is provided with: a present position detecting device (16, 17) for detecting a present position; a plurality of memory devices (14, 15) each capable of reading out map data which is recorded therein; a navigation controlling device (11) for controlling a navigation operation in correspondence with the detected present position by using the map data; and a map data reading device (11) for accessing one of the memory devices, which is selected in accordance with a predetermined condition, and reading out the map data required for the navigation operation therefrom.
29 Citations
17 Claims
-
1. A navigation system comprising:
-
a present position detecting device for detecting a present position;
a plurality of memory devices each capable of reading out map data which is recorded therein;
a navigation controlling device for controlling a navigation operation in correspondence with the detected present position by using the map data; and
a map data reading device for accessing one of the memory devices, which is selected in accordance with a predetermined condition, and reading out the map data required for the navigation operation therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A navigation system comprising:
-
a present position detecting device for detecting a present position;
a first memory device capable of reading out map data from a record medium in which the map data is recorded;
a second memory device of non-volatile type, capable of reading out the map data therefrom and writing the map data thereinto;
a navigation controlling device for controlling a navigation operation in correspondence with the detected present position by using the map data;
a map data transferring device for controlling said first memory device to read out the map data from said record medium at a predetermined timing, and then transferring and storing the read out map data to said second memory device; and
a map data reading device for selecting one of said first and second memory devices in accordance with a predetermined condition, accessing the selected one of said first and second memory devices and reading out the map data required for the navigation operation therefrom. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A navigation system comprising:
-
a present position detecting device for detecting a present position;
a first memory device capable of reading out map data from a record medium in which the map data is recorded;
a second memory device of non-volatile type, capable of reading out the map data therefrom and writing the map data thereinto;
a navigation controlling device for controlling a navigation operation in correspondence with the detected present position by using the map data;
a differential management information generating device for comparing management information of the map data in said first memory device with management information of the map data in said second memory device at a predetermined timing, and generating differential management information indicative of a difference between the compared management informations;
a differential management information storing device for storing the generated differential management information; and
a map data reading device for selecting one of said first and second memory devices in accordance with the differential management information, accessing the selected one of said first and second memory devices and reading out the map data required for the navigation operation therefrom.
-
Specification