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A portable GPS navigation device displays map information and navigation instructions; the device (a) includes a two-way wireless transceiver operable to connect to a mobile telephone; (b) is operable to enable a user to control one or more functions of the mobile telephone and (c) includes an audio

A portable GPS navigation device displays map information and navigation instructions; the device (a) includes a two-way wireless transceiver operable to connect to a mobile telephone; (b) is operable to enable a user to control one or more functions of the mobile telephone and (c) includes an audio output and a microphone to enable a voice call to be made using the mobile telephone.

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1. A portable GPS navigation device, comprising: a touch-sensitive display configured to display map information and navigation route instructions, if the navigation device is in a normal navigation mode;a two-way wireless transceiver configured to connect the navigation device to a mobile telephone

1. A portable GPS navigation device, comprising: a touch-sensitive display configured to display map information and navigation route instructions, if the navigation device is in a normal navigation mode;a two-way wireless transceiver configured to connect the navigation device to a mobile telephone;a processor configured to, enable traffic data to be received by the mobile telephone for use by the navigation device in route calculation,enable a user to control one or more functions of the mobile telephone through a graphical interface presented on the touch-sensitive display of the navigation device in place of map information and navigation instructions, andcause one or more control signals to be sent to the mobile telephone via the two-way transceiver, if the touch-sensitive display is displaying said graphical interface, andif the user touches said graphical interface, the control signals being configured to control said one or more functions of said mobile telephone;an audio output configured to broadcast audible signals received from the mobile telephone via the two-way transceiver; anda microphone configured to return data representing a voice to the mobile telephone via the two-way transceiver. 2. The device of claim 1, wherein the graphical interface includes one or more graphical icons, and the user selects one of the one or more graphical icons to cause the one or more control signals to be sent to the mobile telephone. 3. The device of claim 2, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, causes an incoming voice call to be answered. 4. The device of claim 2, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, causes a voice call to be ended. 5. The device of claim 2, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, causes a text message to be displayed. 6. The device of claim 2, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, opens a phonebook application on the device which the user can search for a required number using a keyboard shown on the touch-sensitive display. 7. The device of claim 6, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, causes a number located in the phone book application to be sent to the mobile telephone and automatically dialed. 8. The device of claim 2, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, causes a pre-stored home telephone number of the user to be automatically sent to the mobile telephone and dialed. 9. The device of claim 2, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, causes an on-screen keyboard to be shown, into which a user enters a telephone number to be dialed. 10. The device of claim 2, wherein one of the one or more graphical icons is an icon that, when selected by a touch action, enables the user to at least one of search, select and call the telephone number of a local point of interest. 11. The device of claim 1, wherein the processor is configured to one of suppress voice navigation instructions during a voice call and replace voice navigation instructions by beeps during a voice call. 12. The device of claim 1, wherein the processor is configured such that, during a voice call, voice navigation instructions from the device are suppressed. 13. The device of claim 1 further comprising: a digital music player, wherein the device being configured such that, during a voice call, music that is being played back on the audio output is in one of paused, the music volume is reduced to a lower volume and the music volume is reduced to zero. 14. The device of claim 1, wherein the processor is configured such that, during a voice call, the graphical information shown on the touch-sensitive display is simplified. 15. The device of claim 14, wherein instead of a 3D moving-map display, large simple navigation arrows are shown by the touch-sensitive display. 16. The device of claim 14, wherein during a voice call, an indicator is shown by the touch-sensitive display to indicate a phone call is in progress. 17. The device of claim 16, wherein touching the indicator will end the voice call. 18. The device of claim 16, wherein touching the indicator will cause a phone-related menu to be displayed. 19. The device of claim 18, wherein the phone related menu displays one or more of the following options hang up, change the sound volume and transfer the phone audio back to the phone so that sound comes from the normal mobile telephone speaker instead of the device speaker. 20. The device of claim 1, wherein during a voice call, a signal is output by the device to an external audio system, with the effect that the external audio system one of reduces volume and pauses during the phone conversation. 21. The device of claim 1, wherein during a phone call, a volume control of the device, normally used to specify the volume of driving instructions, is used to influence the volume of the phone conversation. 22. The device of claim 1, wherein when a phone call comes in, an “incoming call” ringtone is played by the device at least one of instead of and in addition to the “incoming call” action of the mobile telephone phone. 23. The device of claim 1, wherein the touch-sensitive display is configured to display details about an incoming call. 24. The device of claim 23, wherein the details about the incoming call include one or more of a phone number of a caller, the caller name, and other information based on at least one of the number and information available about the incoming phone call. 25. The device of claim 24, wherein audible information is provided based on the details about the incoming call. 26. The device of claim 25, wherein the audible information is generated using computer-generated speech synthesis. 27. The device of claim 1, wherein the processor is configured to accept an incoming voice call one of after a number of seconds, and a number of rings. 28. The device of claim 1, wherein the touch-sensitive display is configured to display a location linked to a caller, and the processor is configured to allow the location to be used as a new navigation destination. 29. The device of claim 28, wherein the touch-sensitive display is configured to display the location on a map. 30. The device of claim 28, wherein the processor is configured to add the location to a database for later use in a navigation application. 31. The device of claim 28, wherein the location linked to the caller is one or more of a part of an information about the caller, a location stored in a database and retrieved by using a number or a name of the caller as a key, the database being associated with one of the mobile telephone, the navigation device, and accessible via on-line services and retrievable by request to a mobile telephone operator. 32. The device of claim 1, wherein if a data message is received by the mobile telephone, the mobile telephone sends the data message to the device. 33. The device of claim 32, wherein if the data message is received by the device, an indicator appears on the touch-sensitive display to indicate receipt of the data message. 34. The device of claim 32, wherein one of a warning sound, a ringtone and a pre-recorded sound fragment plays over the audio output of the device upon receipt of the data message. 35. The device of claim 32, wherein when a data message arrives, the device uses computer-generated speech to read out information relating to the message, including one or more of the name of the sender and the content of the message. 36. The device of claim 32, wherein the processor is configured to enable a user to create a new data message including content generated by navigation software running on the device. 37. The device of claim 36, wherein the content generated by the navigation software includes one or more of an address of the user, coordinates of the user a description of a location of the user a destination of the user an estimated arrival time of the user a speed of the user information related to the current position of the user, a current route of the user a map of the current position of the user, a map of the destination of the user and a map of any other location inside a message. 38. The device of claim 1, wherein the device includes a music player that plays music that is one of dimmed, faded out completely, and paused during the time one of a navigation instruction a navigation-related warning and a navigation related message is played. 39. The device of claim 32, wherein the data message is one of a SMS message, a MMS message and, any text message format and multi-media format. 40. The device of claim 32 in which the data message is any kind of data content that can be used by the device. 41. The device of claim 1, being a portable navigation device configured to be mounted against an internal surface of a vehicle using a suction mount. 42. The device of claim 1, wherein the wireless transceiver is a short-range wireless transceiver configured to be paired with a compatible mobile telephone. 43. The device of claim 1, wherein the wireless transceiver receives traffic data via the mobile telephone, and the navigation device uses the traffic data in route calculation and shows some of the traffic data on the touch-sensitive display. 44. The device of claim 2, wherein activating or controlling one or more functions is disabled if the vehicle is driving above a certain speed. 45. A portable GPS navigation device, comprising: a touch-sensitive display configured to display map information and navigation route instructions, if the navigation device is in a normal navigation mode;a two-way wireless transceiver configured to connect the navigation device to a mobile telephone;a processor configured to, enable a user to control one or more functions of the mobile telephone through a graphical interface presented on the touch-sensitive display of the navigation device in place of map information and navigation instructions, andcause one or more control signals to be sent to the mobile telephone via the two-way transceiver, if the touch-sensitive display is displaying said graphical interface, andif the user touches said graphical interface, the control signals being configured to control said one or more functions of said mobile telephone;an audio output configured to broadcast audible signals received from the mobile telephone via the two-way transceiver, wherein a function of receiving an incoming voice call and a function of entering a telephone number into the navigation device via the two-way transceiver are disabled if the vehicle is driving above a predetermined speed; anda microphone configured to return data representing a voice to the mobile telephone via the two-way transceiver. 46. The portable navigation device of claim 45 further comprising providing a prompt to the user when the navigation device disables the function of receiving an incoming voice call and the function of entering a telephone number into the navigation device.