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.