Some Properties of Bessel Elliptic Kernel and Bessel Ultrahyperbolic Kernel

A navigation system is provided with various interlinked facilities, including a user I/O facility, a route planning facility and a position determining facility. In particular, the navigation system is arranged to physically interface to a data communication facility pertaining to organizer device. An embodiment of such system includes the navigation system arranged to signal actual route data to said organizer device for consideration in a preexistent timetable or diary context. Such system is preferably characterized in that said organizer device is arranged to signal actual diary or timetable data to said navigation system for consideration in a preexistent or future route scheme context.