A navigation method and system allows dynamic access to different degrees of
navigation
functions while a vehicle is in motion based on the surrounding vehicles or obstacles
as detected by sensors provided on the vehicle. The navigation method includes
the steps of detecting whether the user vehicle is in motion or stationary, detecting
other vehicles or obstacles surrounding the user vehicle by a sensor and measuring
distances therefrom when the vehicle is in motion, evaluating resultant data from
the sensor and determining a range of driving conditions, and changing a degree
of accessibility to navigation functions based on the range of the driving conditions
and displaying entries on a monitor of the navigation system where the maximum
number of the entries that can be selected by a user is limited by the degree of accessibility.
