Navigation apparatus for vehicles
First Claim
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1. A vehicle navigation system, comprising:
- a global positioning system (GPS) receiver for receiving signals from satellites;
means for determining whether or not the signals received are sufficient for calculating a present position of a vehicle;
means for calculating the present position of the vehicle;
means for displaying the present position of the vehicle in a first form of display as a most recent correct position displayed solely whenever said determining means determines that the signals received are sufficient for calculating the present position of the vehicle; and
means for changing the most recent correct position displayed into an altered form of display and ceasing to display the present position of the vehicle whenever said determining means determines that the signals received are insufficient for calculating the present position of the vehicle.
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Abstract
A navigation apparatus for a vehicle using a GPS (Global Positioning System) as sensing means in which information on the basis of sensing results, such as a present position, a running locus and the like are displayed in a predetermined form of display on a display section is disclosed. In cases where the GPS receiver cannot receive radio waves from artificial satellites, and sensing thus becomes disabled, a sensed final present position is displayed with an altered form of display.
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Citations
15 Claims
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1. A vehicle navigation system, comprising:
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a global positioning system (GPS) receiver for receiving signals from satellites; means for determining whether or not the signals received are sufficient for calculating a present position of a vehicle; means for calculating the present position of the vehicle; means for displaying the present position of the vehicle in a first form of display as a most recent correct position displayed solely whenever said determining means determines that the signals received are sufficient for calculating the present position of the vehicle; and means for changing the most recent correct position displayed into an altered form of display and ceasing to display the present position of the vehicle whenever said determining means determines that the signals received are insufficient for calculating the present position of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for displaying vehicle navigation information comprising the steps of:
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providing signals received from satellites to a global positioning system (GPS) receiver; determining whether or not the signals received are sufficient for calculating a present position of a vehicle; calculating the present position of the vehicle; displaying the present position of the vehicle in a first form of display as a most recent correct position displayed solely whenever said determining step determines that the signals received are sufficient for calculating the present position of the vehicle; and changing the most recent correct position displayed into an altered form of display and ceasing to display the present position of the vehicle whenever said determining step determines that the signals received are insufficient for calculating the present position of the vehicle. - View Dependent Claims (10, 13, 14, 15)
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- 11. A method for displaying vehicle navigation information as claimed in claim 11, wherein said changing step comprises a step of causing the most recent correct position displayed to flicker.
Specification