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A host application on a host computer system receives annotations made by drivers of respective navigation information displayed to the drivers by GPS devices in vehicles of the respective drivers. The host application saves the annotated navigation information for the respective drivers on a comput

A host application on a host computer system receives annotations made by drivers of respective navigation information displayed to the drivers by GPS devices in vehicles of the respective drivers. The host application saves the annotated navigation information for the respective drivers on a computer readable memory accessible by the host application. The host application receives a request from a first one of the drivers for annotated navigation information made by one or more of the other drivers. Responsive to the request, the host application selects one or more items of the saved annotated navigation information. The host application sends the selected one or more items of the saved annotated navigation information to the GPS device of the first one of the drivers.

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1. A method for providing navigation information to drivers, the method comprising: generating GPS coordinates for a current location by a GPS device in a first vehicle;receiving an annotation for the current location made by a first driver of the first vehicle via the GPS device, wherein the annota

1. A method for providing navigation information to drivers, the method comprising: generating GPS coordinates for a current location by a GPS device in a first vehicle;receiving an annotation for the current location made by a first driver of the first vehicle via the GPS device, wherein the annotation includes navigation information for display to other drivers by GPS devices in vehicles of the respective other drivers;sending the GPS coordinates for the current location and the annotation from the GPS device in the first vehicle to a host application on a host computer system for storing on a computer readable storage device accessible by the host application;sending, from the GPS device in the first vehicle to the host application, a request including GPS coordinates for the current location from the first driver for annotated navigation information made by one or more of the other drivers and stored on the computer readable storage device accessible by the host application;receiving, by the GPS device of the first vehicle from the host application, one or more items of annotated navigation information of other drivers stored by the host application and selected by the host application responsive to the request of the first driver; andpresenting by the GPS device of the first vehicle the one or more items of annotated navigation information of the other drivers received from the host applicationwherein the annotated navigation information includes landmarks, and the receiving by the GPS device of the first vehicle from the host application of the one or more items of annotated navigation information selected by the host application includes receiving, for a particular landmark of a particular location, one or more items of annotated navigation information that match a frequency of occurrence criteria specified by the first driver. 2. The method of claim 1, wherein the annotated navigation information includes annotated navigation information captured from one of the drivers by the driver's mobile phone. 3. The method of claim 1, wherein the annotated navigation information is stored in respective driver collections. 4. The method of claim 1, wherein the frequency of occurrence criteria includes a most-frequent-landmark criteria specified by the first driver for the particular location, wherein the host application finds a landmark most frequently included in the other drivers' annotated navigation information for the particular location. 5. The method of claim 1, wherein the frequency of occurrence criteria includes a most-informed-driver criteria specified by the first driver for the particular location, wherein the host application finds a landmark made by one of the other drivers who passed the particular landmark most frequently. 6. The method of claim 1, wherein the selecting includes the host application finding annotated navigation information of a particular other driver responsive to the first driver specifying the particular other driver. 7. A computer program product for a GPS device in a first vehicle, the computer program product comprising: a computer readable storage device having a computer program stored thereon, for providing navigation information to a first driver of the first vehicle, the computer program product having instructions for execution by a computer of the GPS device, wherein the instructions, when executed by the computer, cause the computer to implement a method comprising:generating GPS coordinates for a current location of the first vehicle;receiving an annotation for the current location made by the first driver via the GPS device, wherein the annotation includes navigation information for display to other drivers by GPS devices in vehicles of the respective other drivers;sending the GPS coordinates for the current location and the annotation from the GPS device of the first vehicle to a host application on a host computer system for storing on a computer readable storage device accessible by the host application;sending, from the GPS device of the first vehicle to the host application, a request including GPS coordinates for the current location from the first driver for annotated navigation information made by one or more of the other drivers and stored on the computer readable storage device accessible by the host application;receiving, by the GPS device of the first vehicle from the host application, one or more items of annotated navigation information of the other drivers stored by the host application and selected by the host application responsive to the request of the first driver; andpresenting by the GPS device of the first vehicle the one or more items of annotated navigation information of the other drivers received from the host application,wherein the annotated navigation information includes landmarks, and the receiving by the GPS device of the first vehicle from the host application of the one or more items of annotated navigation information selected by the host application includes receiving, for a particular landmark of a particular location, one or more items of annotated navigation information that match a frequency of occurrence criteria specified by the first driver. 8. The computer program of claim 7, wherein the annotated navigation information includes annotated navigation information captured from one of the drivers by the driver's mobile phone. 9. The computer program of claim 7, wherein the annotated navigation information is stored in respective driver collections. 10. The computer program of claim 7, wherein the frequency of occurrence criteria includes a most-frequent-landmark criteria specified by the first driver for the particular location, wherein the host application finds a landmark most frequently included in the other drivers' annotated navigation information for the particular location. 11. The computer program of claim 7, wherein the frequency of occurrence criteria includes a most-informed-driver criteria specified by the first driver for the particular location, wherein the host application finds a landmark made by one of the other drivers who passed the particular landmark most frequently. 12. The computer program of claim 7, wherein the selecting includes the host application finding annotated navigation information of a particular other driver responsive to the first driver specifying the particular other driver. 13. A GPS device for providing navigation information to drivers comprising: a processor; anda storage device connected to the processor, wherein the storage device has stored thereon a navigation information program for controlling the processor, and wherein the processor is operative with the program to execute the program for performing:generating GPS coordinates for a current location by the GPS device, wherein the GPS device is in a first vehicle;receiving an annotation for the current location made by a first driver of the first vehicle via the GPS device, wherein the annotation includes navigation information for display to other drivers by GPS devices in vehicles of the respective other drivers;sending the GPS coordinates for the current location and the annotation from the GPS device of the first vehicle to a host application on a host computer system for storing on a computer readable storage device accessible by the host application;sending, from the GPS device of the first vehicle to the host application, a request including GPS coordinates for the current location from the first driver for annotated navigation information made by one or more of the other drivers and stored on the computer readable storage device accessible by the host application;receiving, by the GPS device of the first vehicle from the host application, one or more items of annotated navigation information of the other drivers stored by the host application and selected by the host application responsive to the request of the first driver; andpresenting by GPS device of the first vehicle the one or more items of annotated navigation information of the other drivers received from the host applicationwherein the annotated navigation information includes landmarks, and the receiving by the GPS device of the first vehicle from the host application of the one or more items of annotated navigation information selected by the host application includes receiving, for a particular landmark of a particular location, one or more items of annotated navigation information that match a frequency of occurrence criteria specified by the first driver. 14. The GPS device of claim 13, wherein the annotated navigation information is stored in respective driver collections. 15. The GPS device of claim 13, wherein the frequency of occurrence criteria includes a most-frequent-landmark criteria specified by the first driver for the particular location, wherein the host application finds a landmark most frequently included in the other drivers' annotated navigation information for the particular location. 16. The GPS device of claim 13, wherein the frequency of occurrence criteria includes a most-informed-driver criteria specified by the first driver for the particular location, wherein the host application finds a landmark made by one of the other drivers who passed the particular landmark most frequently. 17. The GPS device of claim 13, wherein the selecting includes the host application finding annotated navigation information of a particular other driver responsive to the first driver specifying the particular other driver.