The present disclosure relates to navigation, and particularly to a navigation device and method.
2. Description of Related Art
Navigation devices are becoming more and more prevalent. Via built-in map data for route planning, a navigation device display electronic maps and provides indication directions to enable a user to arrive at a desired destination.
However, directions of the electronic maps are not changed according to direction changes of the navigation device, the user need to change the indication directions to actual directions via comparing road environment displayed on the navigation device with actual environment. This is inconvenient. Therefore, improved navigation devices and methods are desired.
Referring to
The receiving unit 102 is used for receiving positioning signals, the positioning signals may be transmitted by global positioning system (GPS) satellites.
The positioning unit 104 is used for computing current positioning information of the navigation device 100 according to the positioning signals.
The memory 106 is used for storing an electronic map 400 (referring to
The orientation detector 108 is used for detecting a turned angle and a turned direction of the navigation device 100. When the navigation device 100 is adopted in a vehicle, the orientation detector 108 detects the turned angle and turned direction of the vehicle. The turned direction may be clockwise or counter-clockwise. The orientation detector 108 may be an accelerometer or an electronic compass or others. When the orientation detector 108 is an accelerometer, the orientation detector 108 detects the turned angle and the turned direction by detecting centrifugal forces of the navigation device 100 when the navigation device 100 turns. When the orientation detector 108 is an electronic compass, the orientation detector 108 detects the turned angle and the turned direction by detecting changes in the earth magnetic field.
The processor 110 is used for obtaining the electronic map 400 from the memory 106, and rotating the electronic map 400 according to the turned angle and the turned direction of the navigation device 100. It is understood that a rotation direction of the electronic map 400 is opposite to the turned direction of the navigation device 100; a rotation angle of the electronic map 400 is substantially equal to the turned angle of the navigation device 100.
The display unit 112 is used for displaying the rotated electronic map 400 and a position indicator on the electronic map according to the current positioning information of the navigation device 100.
In use, when the orientation detector 108 is an accelerometer, the user may need to manually adjust orientation of the electronic map 400 before using the navigation device 100. When the orientation detector 108 is an electronic compass, the electronic compass can be appropriately configured to automatically adjust directions of the electronic map 400.
Referring to
Referring to
In step S301, reading and displaying an electronic map on a navigation device.
In step S303, receiving position signals and computing current positioning information according to the positioning signals. The positioning signals may be transmitted by global positioning system (GPS) satellites.
In step S305, detecting a turned angle and a turned direction of the navigation device. The turned angle and the turned direction may be detected by an accelerometer or an electronic compass or others. The turned direction may be clockwise or counter-clockwise.
In step S307, rotating the electronic map according to the turned angle and the turned direction of the navigation device. It is understood that a rotation direction of the electronic map is opposite to the turned direction of the navigation device 100, a rotation angle of the electronic map is substantially equal to the turned angle of the navigation device 100.
In step S309, displaying the rotated electronic map and an position indicator according to the current positioning information of the navigation device.
It is to be understood, however, that even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only; and that changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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200810305961.8 | Dec 2008 | CN | national |