Navigation apparatus with non-volatile memory for return to initial departure point
First Claim
1. A vehicular navigation apparatus comprising:
- input means for inputting an initial departure point and a destination point;
a random access memory including non-volatile random access memory;
means for storing and preserving the initial departure point in the non-volatile random access memory even if an ignition switch is turned off;
means for copying the initial departure point as a working departure point in the random access memory;
memory means including stored course information and stored guidance information;
means responsive to the working departure point and the destination point for determining a course from the working departure point to the destination point based upon the stored course information;
display means for retrieving and displaying guidance information from the memory means to guide travel along the course;
means responsive to an indication of arrival at the destination for setting the destination point as the working departure point and for permitting entry of a new destination point as the destination point or permitting entry of an indication of return to the initial departure point, said setting of the destination point as the working departure point being without disturbing said stored initial departure point in the non-volatile random access memory even if the working departure point is replaced a plurality of times by guided travel to a corresponding plurality of new destination points; and
means responsive to entry of an indication of return to the initial departure point for setting the initial departure point as the destination point.
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Accused Products
Abstract
A navigation apparatus has an input unit (1), a CPU (2), a display unit (3) and a memory unit (4), the memory unit (4) being a memory such as a CD-ROM in which network data of geographical points, namely destinations and present locations, and information are stored in advance. Also stored are map data (10), an intersection list (11), a destination list (12), road data (13) and a region name list (14), etc. When a destination is designated by an input from the input means (1), the CPU (2) performs an exchange with a program, stored in a ROM (9a), in order to set information for travel to the destination by course exploration in accordance with each geographical point stored in the memory unit (4). This information is stored in a memory such as a RAM (9b). In an embodiment, the RAM (9b) is provided with a non-volatile area for storing departure-point data (east longitude, north latitude, etc.). When an input is made by a reset switch in entering a departure point, the data in this non-volatile area can be rewritten. Data written in are preserved until the reset switch is pressed again and a geographical point is entered. Data will not be erased even if an ignition switch is turned off.
172 Citations
8 Claims
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1. A vehicular navigation apparatus comprising:
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input means for inputting an initial departure point and a destination point; a random access memory including non-volatile random access memory; means for storing and preserving the initial departure point in the non-volatile random access memory even if an ignition switch is turned off; means for copying the initial departure point as a working departure point in the random access memory; memory means including stored course information and stored guidance information; means responsive to the working departure point and the destination point for determining a course from the working departure point to the destination point based upon the stored course information; display means for retrieving and displaying guidance information from the memory means to guide travel along the course; means responsive to an indication of arrival at the destination for setting the destination point as the working departure point and for permitting entry of a new destination point as the destination point or permitting entry of an indication of return to the initial departure point, said setting of the destination point as the working departure point being without disturbing said stored initial departure point in the non-volatile random access memory even if the working departure point is replaced a plurality of times by guided travel to a corresponding plurality of new destination points; and means responsive to entry of an indication of return to the initial departure point for setting the initial departure point as the destination point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification